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DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)
以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32)以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes)以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr)以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr)以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32)以指定的大小，在指定的位置繪製所指定 Image 之指定部分。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System::Drawing::GraphicsUnit srcUnit);public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit);member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * int * int * int * int * System.Drawing.GraphicsUnit -> unitPublic Sub DrawImage (image As Image, destRect As Rectangle, srcX As Integer, srcY As Integer, srcWidth As Integer, srcHeight As Integer, srcUnit As GraphicsUnit)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像的目的地矩形。
建立來源矩形的座標，以從中擷取影像的一部分。
將來源矩形的測量單位設定為圖元。
將影像繪製到畫面。
目的矩形的位置會找出螢幕上的影像，而來源和目的地矩形的大小會決定繪製影像的縮放比例，而來源矩形的大小會決定原始影像的哪個部分繪製到螢幕。
void DrawImageRect4Int( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying image.
Rectangle destRect = Rectangle(100,100,450,150);
// Create coordinates of rectangle for source image.
int x = 50;
int y = 50;
int width = 150;
int height = 150;
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw image to screen.
e->Graphics->DrawImage( newImage, destRect, x, y, width, height, units );
private void DrawImageRect4Int(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying image.
Rectangle destRect = new Rectangle(100, 100, 450, 150);
// Create coordinates of rectangle for source image.
int x = 50;
int y = 50;
int width = 150;
int height = 150;
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, destRect, x, y, width, height, units);
Private Sub DrawImageRect4Int(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying image.
Dim destRect As New Rectangle(100, 100, 450, 150)
' Create coordinates of rectangle for source image.
Dim x As Integer = 50
Dim y As Integer = 50
Dim width As Integer = 150
Dim height As Integer = 150
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, destRect, x, y, width, height, _
units)
End Sub
srcX
、
srcY
、
srcWidth
和
srcHeight
參數會指定要繪製之
image
物件的矩形部分。 矩形相對於來源影像的左上角。 這個部分會調整為符合 參數所
destRect
指定矩形內的大小。
public:
void DrawImage(System::Drawing::Image ^ image, float x, float y, float width, float height);
public void DrawImage (System.Drawing.Image image, float x, float y, float width, float height);
member this.DrawImage : System.Drawing.Image * single * single * single * single -> unit
Public Sub DrawImage (image As Image, x As Single, y As Single, width As Single, height As Single)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像之矩形的位置和大小。
將影像繪製到畫面。
矩形的位置會找出畫面上的影像，而原始影像的大小和矩形的大小會決定繪製影像的縮放比例。
public:
void DrawImage4Float( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create coordinates for upper-left corner.
// of image and for size of image.
float x = 100.0F;
float y = 100.0F;
float width = 450.0F;
float height = 150.0F;
// Draw image to screen.
e->Graphics->DrawImage( newImage, x, y, width, height );
public void DrawImage4Float(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create coordinates for upper-left corner.
// of image and for size of image.
float x = 100.0F;
float y = 100.0F;
float width = 450.0F;
float height = 150.0F;
// Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, width, height);
Public Sub DrawImage4Float(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create coordinates for upper-left corner
' of image and for size of image.
Dim x As Single = 100.0F
Dim y As Single = 100.0F
Dim width As Single = 450.0F
Dim height As Single = 150.0F
' Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, width, height)
End Sub
、
y
、
width
和
height
參數所
x
定義的矩形會決定繪製影像的位置和大小。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttr, System.Drawing.Graphics.DrawImageAbort callback);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback);
member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] * System.Drawing.Rectangle * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort -> unit
Public Sub DrawImage (image As Image, destPoints As Point(), srcRect As Rectangle, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 程式碼會先定義委派的
Graphics.DrawImageAbort
回呼方法;定義很簡單，而且只會測試方法是否
DrawImage
使用 Null
callBackData
參數呼叫它。 範例的主本文會執行下列動作：
建立回呼方法的
Graphics.DrawImageAbort
實例：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，以定義用來繪製影像的平行投影。
建立矩形以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立額外的平行投影，在其中繪製調整後的影像。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未合併的平行投影，位置會在畫面上找到影像，而矩形的大小以及平行投影的大小和形狀，會決定繪製影像的縮放和切割。
因為這個範例使用不傳遞
callBackData
參數的多載，
Graphics.DrawImageAbort
所以回呼會
true
傳回 ，這會導致
DrawImage
方法結束，而範例中包含的例外狀況處理常式代碼會列印出例外狀況文字，而不是繪製影像。
// Define DrawImageAbort callback method.
private:
bool DrawImageCallback1( IntPtr callBackData )
// Test for call that passes callBackData parameter.
if ( callBackData == IntPtr::Zero )
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private:
void DrawImageParaRectAttribAbort( PaintEventArgs^ e )
// Create callback method.
Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback1 );
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing original image.
Point ulCorner = Point(100,100);
Point urCorner = Point(550,100);
Point llCorner = Point(150,250);
array<Point>^ destPara1 = {ulCorner,urCorner,llCorner};
// Create rectangle for source image.
Rectangle srcRect = Rectangle(50,50,150,150);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destPara1, srcRect, units );
// Create parallelogram for drawing adjusted image.
Point ulCorner2 = Point(325,100);
Point urCorner2 = Point(550,100);
Point llCorner2 = Point(375,250);
array<Point>^ destPara2 = {ulCorner2,urCorner2,llCorner2};
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw image to screen.
e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr, imageCallback );
catch ( Exception^ ex )
e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
// Define DrawImageAbort callback method.
private bool DrawImageCallback1(IntPtr callBackData)
// Test for call that passes callBackData parameter.
if(callBackData==IntPtr.Zero)
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private void DrawImageParaRectAttribAbort(PaintEventArgs e)
// Create callback method.
Graphics.DrawImageAbort imageCallback
= new Graphics.DrawImageAbort(DrawImageCallback1);
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing original image.
Point ulCorner = new Point(100, 100);
Point urCorner = new Point(550, 100);
Point llCorner = new Point(150, 250);
Point[] destPara1 = {ulCorner, urCorner, llCorner};
// Create rectangle for source image.
Rectangle srcRect = new Rectangle(50, 50, 150, 150);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
// Create parallelogram for drawing adjusted image.
Point ulCorner2 = new Point(325, 100);
Point urCorner2 = new Point(550, 100);
Point llCorner2 = new Point(375, 250);
Point[] destPara2 = {ulCorner2, urCorner2, llCorner2};
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
checked
// Draw image to screen.
e.Graphics.DrawImage(
newImage,
destPara2,
srcRect,
units,
imageAttr,
imageCallback);
catch (Exception ex)
e.Graphics.DrawString(
ex.ToString(),
new Font("Arial", 8),
Brushes.Black,
new PointF(0, 0));
Private Function DrawImageCallback1(ByVal callBackData As IntPtr) As Boolean
' Test for call that passes callBackData parameter.
If callBackData.Equals(IntPtr.Zero) Then
' If no callBackData passed, abort DrawImage method.
Return True
' If callBackData passed, continue DrawImage method.
Return False
End If
End Function
Private Sub DrawImageParaRectAttribAbort(ByVal e As PaintEventArgs)
' Create callback method.
Dim imageCallback As New _
Graphics.DrawImageAbort(AddressOf DrawImageCallback1)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing original image.
Dim ulCorner As New Point(100, 100)
Dim urCorner As New Point(550, 100)
Dim llCorner As New Point(150, 250)
Dim destPara1 As Point() = {ulCorner, urCorner, llCorner}
' Create rectangle for source image.
Dim srcRect As New Rectangle(50, 50, 150, 150)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units)
' Create parallelogram for drawing adjusted image.
Dim ulCorner2 As New Point(325, 100)
Dim urCorner2 As New Point(550, 100)
Dim llCorner2 As New Point(375, 250)
Dim destPara2 As Point() = {ulCorner2, urCorner2, llCorner2}
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
imageAttr, imageCallback)
Catch ex As Exception
e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
Brushes.Black, New PointF(0, 0))
End Try
End Sub
參數
destPoints
會指定平行投影的三個點。 這三個
PointF
結構代表平行投影的左上角、右上角和左下角。 第四個點是從前三個點推斷，以形成平行投影。
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影。
具有 參數的
callback
這個多載會根據應用程式所決定的準則，提供停止影像繪製的方法。 例如，應用程式可以開始繪製大型影像，而使用者可能會從畫面捲動影像，在此情況下，應用程式可能會停止繪圖。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttr, System.Drawing.Graphics.DrawImageAbort callback);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback);
member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] * System.Drawing.RectangleF * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort -> unit
Public Sub DrawImage (image As Image, destPoints As PointF(), srcRect As RectangleF, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 程式碼會先定義委派的
Graphics.DrawImageAbort
回呼方法;定義很簡單，而且只會測試方法是否
DrawImage
使用 Null
callBackData
參數呼叫它。 範例的主本文會執行下列動作：
建立回呼方法的
Graphics.DrawImageAbort
實例。
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，以定義用來繪製影像的平行投影。
建立矩形以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立額外的平行投影，在其中繪製調整後的影像。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未合併的平行投影，位置會在畫面上找到影像，而矩形的大小以及平行投影的大小和形狀，會決定繪製影像的縮放和切割。
因為這個範例使用不傳遞
callBackData
參數的多載，
Graphics.DrawImageAbort
所以回呼會
true
傳回 ，這會導致
DrawImage
方法結束，而範例中包含的例外狀況處理常式代碼會列印出例外狀況文字，而不是繪製影像。
// Define DrawImageAbort callback method.
private:
bool DrawImageCallback3( IntPtr callBackData )
// Test for call that passes callBackData parameter.
if ( callBackData == IntPtr::Zero )
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private:
void DrawImageParaFRectAttribAbort( PaintEventArgs^ e )
// Create callback method.
Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback3 );
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing original image.
PointF ulCorner1 = PointF(100.0F,100.0F);
PointF urCorner1 = PointF(325.0F,100.0F);
PointF llCorner1 = PointF(150.0F,250.0F);
array<PointF>^ destPara1 = {ulCorner1,urCorner1,llCorner1};
// Create rectangle for source image.
RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
GraphicsUnit units = GraphicsUnit::Pixel;
// Create parallelogram for drawing adjusted image.
PointF ulCorner2 = PointF(325.0F,100.0F);
PointF urCorner2 = PointF(550.0F,100.0F);
PointF llCorner2 = PointF(375.0F,250.0F);
array<PointF>^ destPara2 = {ulCorner2,urCorner2,llCorner2};
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destPara1, srcRect, units );
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr, imageCallback );
catch ( Exception^ ex )
e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
// Define DrawImageAbort callback method.
private bool DrawImageCallback3(IntPtr callBackData)
// Test for call that passes callBackData parameter.
if(callBackData==IntPtr.Zero)
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private void DrawImageParaFRectAttribAbort(PaintEventArgs e)
// Create callback method.
Graphics.DrawImageAbort imageCallback
= new Graphics.DrawImageAbort(DrawImageCallback3);
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing original image.
PointF ulCorner1 = new PointF(100.0F, 100.0F);
PointF urCorner1 = new PointF(325.0F, 100.0F);
PointF llCorner1 = new PointF(150.0F, 250.0F);
PointF[] destPara1 = {ulCorner1, urCorner1, llCorner1};
// Create rectangle for source image.
RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
GraphicsUnit units = GraphicsUnit.Pixel;
// Create parallelogram for drawing adjusted image.
PointF ulCorner2 = new PointF(325.0F, 100.0F);
PointF urCorner2 = new PointF(550.0F, 100.0F);
PointF llCorner2 = new PointF(375.0F, 250.0F);
PointF[] destPara2 = {ulCorner2, urCorner2, llCorner2};
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
checked
// Draw adjusted image to screen.
e.Graphics.DrawImage(
newImage,
destPara2,
srcRect,
units,
imageAttr,
imageCallback);
catch (Exception ex)
e.Graphics.DrawString(
ex.ToString(),
new Font("Arial", 8),
Brushes.Black,
new PointF(0, 0));
Private Function DrawImageCallback3(ByVal callBackData As IntPtr) As Boolean
' Test for call that passes callBackData parameter.
If callBackData.Equals(IntPtr.Zero) Then
' If no callBackData passed, abort DrawImage method.
Return True
' If callBackData passed, continue DrawImage method.
Return False
End If
End Function
Private Sub DrawImageParaFRectAttribAbort(ByVal e As PaintEventArgs)
' Create callback method.
Dim imageCallback As New _
Graphics.DrawImageAbort(AddressOf DrawImageCallback3)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing original image.
Dim ulCorner1 As New PointF(100.0F, 100.0F)
Dim urCorner1 As New PointF(325.0F, 100.0F)
Dim llCorner1 As New PointF(150.0F, 250.0F)
Dim destPara1 As PointF() = {ulCorner1, urCorner1, llCorner1}
' Create rectangle for source image.
Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Create parallelogram for drawing adjusted image.
Dim ulCorner2 As New PointF(325.0F, 100.0F)
Dim urCorner2 As New PointF(550.0F, 100.0F)
Dim llCorner2 As New PointF(375.0F, 250.0F)
Dim destPara2 As PointF() = {ulCorner2, urCorner2, llCorner2}
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
imageAttr, imageCallback)
Catch ex As Exception
e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
Brushes.Black, New PointF(0, 0))
End Try
End Sub
參數
destPoints
會指定平行投影的三個點。 這三個
PointF
結構代表平行投影的左上角、右上角和左下角。 第四個點是從前三個點推斷，以形成平行投影。
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影。
具有 參數的
callback
這個多載會根據應用程式所決定的準則，提供停止影像繪製的方法。 例如，應用程式可以開始繪製大型影像，而使用者可能會從畫面捲動影像，在此情況下，應用程式可能會停止繪圖。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback, int callbackData);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttr, System.Drawing.Graphics.DrawImageAbort callback, int callbackData);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback, int callbackData);
member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] * System.Drawing.RectangleF * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort * int -> unit
Public Sub DrawImage (image As Image, destPoints As PointF(), srcRect As RectangleF, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort, callbackData As Integer)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Pa
Paint
。 程式碼會先定義委派的
Graphics.DrawImageAbort
回呼方法;定義很簡單，而且只會測試方法是否
DrawImage
使用 Null
callBackData
參數呼叫它。 範例的主本文會執行下列動作：
建立回呼方法的
Graphics.DrawImageAbort
實例。
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，以定義用來繪製影像的平行投影。
建立矩形以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立額外的平行投影，在其中繪製調整後的影像。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未合併的平行投影，位置會在畫面上找到影像，而矩形的大小以及平行投影的大小和形狀，會決定繪製影像的縮放和切割。
因為這個範例會使用傳遞
callBackData
參數的多載，
Graphics.DrawImageAbort
所以回呼會
false
傳回 ，這會導致
DrawImage
方法繼續，而此範例會將調整後的影像繪製到畫面。
// Define DrawImageAbort callback method.
private:
bool DrawImageCallback4( IntPtr callBackData )
// Test for call that passes callBackData parameter.
if ( callBackData == IntPtr::Zero )
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private:
void DrawImageParaFRectAttribAbortData( PaintEventArgs^ e )
// Create callback method.
Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback4 );
int imageCallbackData = 1;
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing original image.
PointF ulCorner1 = PointF(100.0F,100.0F);
PointF urCorner1 = PointF(325.0F,100.0F);
PointF llCorner1 = PointF(150.0F,250.0F);
array<PointF>^ destPara1 = {ulCorner1,urCorner1,llCorner1};
// Create rectangle for source image.
RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
GraphicsUnit units = GraphicsUnit::Pixel;
// Create parallelogram for drawing adjusted image.
PointF ulCorner2 = PointF(325.0F,100.0F);
PointF urCorner2 = PointF(550.0F,100.0F);
PointF llCorner2 = PointF(375.0F,250.0F);
array<PointF>^ destPara2 = {ulCorner2,urCorner2,llCorner2};
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destPara1, srcRect, units );
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr, imageCallback, imageCallbackData );
catch ( Exception^ ex )
e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
// Define DrawImageAbort callback method.
private bool DrawImageCallback4(IntPtr callBackData)
// Test for call that passes callBackData parameter.
if(callBackData==IntPtr.Zero)
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private void DrawImageParaFRectAttribAbortData(PaintEventArgs e)
// Create callback method.
Graphics.DrawImageAbort imageCallback
= new Graphics.DrawImageAbort(DrawImageCallback4);
int imageCallbackData = 1;
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing original image.
PointF ulCorner1 = new PointF(100.0F, 100.0F);
PointF urCorner1 = new PointF(325.0F, 100.0F);
PointF llCorner1 = new PointF(150.0F, 250.0F);
PointF[] destPara1 = {ulCorner1, urCorner1, llCorner1};
// Create rectangle for source image.
RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
GraphicsUnit units = GraphicsUnit.Pixel;
// Create parallelogram for drawing adjusted image.
PointF ulCorner2 = new PointF(325.0F, 100.0F);
PointF urCorner2 = new PointF(550.0F, 100.0F);
PointF llCorner2 = new PointF(375.0F, 250.0F);
PointF[] destPara2 = {ulCorner2, urCorner2, llCorner2};
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
checked
// Draw adjusted image to screen.
e.Graphics.DrawImage(
newImage,
destPara2,
srcRect,
units,
imageAttr,
imageCallback,
imageCallbackData);
catch (Exception ex)
e.Graphics.DrawString(
ex.ToString(),
new Font("Arial", 8),
Brushes.Black,
new PointF(0, 0));
Private Function DrawImageCallback4(ByVal callBackData As IntPtr) As Boolean
' Test for call that passes callBackData parameter.
If callBackData.Equals(IntPtr.Zero) Then
' If no callBackData passed, abort DrawImage method.
Return True
' If callBackData passed, continue DrawImage method.
Return False
End If
End Function
Private Sub DrawImageParaFRectAttribAbortData(ByVal e As PaintEventArgs)
' Create callback method.
Dim imageCallback As New _
Graphics.DrawImageAbort(AddressOf DrawImageCallback4)
Dim imageCallbackData As Integer = 1
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing original image.
Dim ulCorner1 As New PointF(100.0F, 100.0F)
Dim urCorner1 As New PointF(325.0F, 100.0F)
Dim llCorner1 As New PointF(150.0F, 250.0F)
Dim destPara1 As PointF() = {ulCorner1, urCorner1, llCorner1}
' Create rectangle for source image.
Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Create parallelogram for drawing adjusted image.
Dim ulCorner2 As New PointF(325.0F, 100.0F)
Dim urCorner2 As New PointF(550.0F, 100.0F)
Dim llCorner2 As New PointF(375.0F, 250.0F)
Dim destPara2 As PointF() = {ulCorner2, urCorner2, llCorner2}
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
imageAttr, imageCallback, imageCallbackData)
Catch ex As Exception
e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
Brushes.Black, New PointF(0, 0))
End Try
End Sub
參數
destPoints
會指定平行投影的三個點。 這三個
PointF
結構代表平行投影的左上角、右上角和左下角。 第四個點是從前三個點推斷，以形成平行投影。
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影。
具有 和
callbackData
參數的
callback
這個多載提供方法，一旦根據應用程式所決定的準則和資料開始，即可停止影像的繪製。 例如，應用程式可以開始繪製大型影像，而使用者可能會從畫面捲動影像，在此情況下，應用程式可能會停止繪圖。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System::Drawing::GraphicsUnit srcUnit);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * single * single * single * single * System.Drawing.GraphicsUnit -> unit
Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Single, srcY As Single, srcWidth As Single, srcHeight As Single, srcUnit As GraphicsUnit)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像之目的地矩形的座標。
建立來源矩形，從中擷取影像的一部分。
將來源矩形的測量單位設定為圖元。
將影像繪製到畫面。
目的矩形的位置會找出畫面上的影像、來源和目的地矩形的大小會決定繪製影像的縮放比例，而來源矩形的大小會決定原始影像的哪個部分繪製到螢幕。
private:
void DrawImageRect4Float( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying image.
Rectangle destRect = Rectangle(100,100,450,150);
// Create coordinates of rectangle for source image.
float x = 50.0F;
float y = 50.0F;
float width = 150.0F;
float height = 150.0F;
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw image to screen.
e->Graphics->DrawImage( newImage, destRect, x, y, width, height, units );
private void DrawImageRect4Float(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying image.
Rectangle destRect = new Rectangle(100, 100, 450, 150);
// Create coordinates of rectangle for source image.
float x = 50.0F;
float y = 50.0F;
float width = 150.0F;
float height = 150.0F;
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, destRect, x, y, width, height, units);
Private Sub DrawImageRect4Float(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying image.
Dim destRect As New Rectangle(100, 100, 450, 150)
' Create coordinates of rectangle for source image.
Dim x As Single = 50.0F
Dim y As Single = 50.0F
Dim width As Single = 150.0F
Dim height As Single = 150.0F
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, destRect, x, y, width, height, _
units)
End Sub
srcX
、
srcY
、
srcWidth
和
srcHeight
參數會指定要繪製之
image
物件的矩形部分。 矩形相對於來源影像的左上角。 這個部分會調整為符合 參數所
destRect
指定矩形內的大小。
public:
void DrawImage(System::Drawing::Image ^ image, float x, float y, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit);
public void DrawImage (System.Drawing.Image image, float x, float y, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit);
member this.DrawImage : System.Drawing.Image * single * single * System.Drawing.RectangleF * System.Drawing.GraphicsUnit -> unit
Public Sub DrawImage (image As Image, x As Single, y As Single, srcRect As RectangleF, srcUnit As GraphicsUnit)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要繪製影像左上角的座標。
建立來源矩形，從中擷取影像的一部分。
將來源矩形的測量單位設定為圖元。
將影像繪製到畫面。
來源矩形的大小會決定未調整原始影像的哪個部分繪製到螢幕。
public:
void DrawImage2FloatRectF( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create coordinates for upper-left corner of image.
float x = 100.0F;
float y = 100.0F;
// Create rectangle for source image.
RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw image to screen.
e->Graphics->DrawImage( newImage, x, y, srcRect, units );
public void DrawImage2FloatRectF(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create coordinates for upper-left corner of image.
float x = 100.0F;
float y = 100.0F;
// Create rectangle for source image.
RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, srcRect, units);
Public Sub DrawImage2FloatRectF(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create coordinates for upper-left corner of image.
Dim x As Single = 100.0F
Dim y As Single = 100.0F
' Create rectangle for source image.
Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, srcRect, units)
End Sub
會
Image
儲存圖元寬度的值，以及水準解析度的值， (英吋的點數) 。 以英吋為單位的影像實體寬度是圖元寬度除以水準解析度。 例如，圖元寬度為 360 且水準解析度為每英吋 72 點的影像，實體寬度為 5 英吋。 類似的備註適用于圖元高度和實體高度。
此方法會使用其實體大小繪製影像的一部分，因此影像部分的大小會以英吋為單位，不論顯示器裝置的解析度 (點每英吋) 解析度為何。 例如，假設影像部分的圖元寬度為 216，而水準解析度為每英吋 72 點。 如果您呼叫此方法，在解析度為 96 點/英吋的裝置上繪製該影像部分，轉譯影像部分的圖元寬度將會 (216/72) *96 = 288。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttrs);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttrs);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttrs);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * single * single * single * single * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit
Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Single, srcY As Single, srcWidth As Single, srcHeight As Single, srcUnit As GraphicsUnit, imageAttrs As ImageAttributes)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像的目的地矩形。
建立來源矩形的座標，以從中擷取影像的一部分。
將來源矩形的測量單位設定為圖元。
將原始影像繪製到畫面。
建立要在其中繪製調整影像的額外矩形。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未調整的目的地矩形，位置會找出畫面上的影像，而來源和目的地矩形的大小會決定繪製影像的縮放比例，而來源矩形的大小會決定原始影像的哪個部分繪製到螢幕。
private:
void DrawImageRect4FloatAttrib( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying original image.
Rectangle destRect1 = Rectangle(100,25,450,150);
// Create coordinates of rectangle for source image.
float x = 50.0F;
float y = 50.0F;
float width = 150.0F;
float height = 150.0F;
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );
// Create rectangle for adjusted image.
Rectangle destRect2 = Rectangle(100,175,450,150);
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr );
private void DrawImageRect4FloatAttrib(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying original image.
Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
// Create coordinates of rectangle for source image.
float x = 50.0F;
float y = 50.0F;
float width = 150.0F;
float height = 150.0F;
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
// Create rectangle for adjusted image.
Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
// Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destRect2, x, y, width, height, units, imageAttr);
Private Sub DrawImageRect4FloatAttrib(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying original image.
Dim destRect1 As New Rectangle(100, 25, 450, 150)
' Create coordinates of rectangle for source image.
Dim x As Single = 50.0F
Dim y As Single = 50.0F
Dim width As Single = 150.0F
Dim height As Single = 150.0F
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, _
height, units)
' Create rectangle for adjusted image.
Dim destRect2 As New Rectangle(100, 175, 450, 150)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destRect2, x, y, width, height, _
units, imageAttr)
End Sub
srcX
、
srcY
、
srcWidth
和
srcHeight
參數會指定要繪製之
image
物件的矩形部分。 矩形相對於來源影像的左上角。 這個部分會調整為符合 參數所
destRect
指定矩形內的大小。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttr, System.Drawing.Graphics.DrawImageAbort callback);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * int * int * int * int * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort -> unit
Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Integer, srcY As Integer, srcWidth As Integer, srcHeight As Integer, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 程式碼會先定義委派的
Graphics.DrawImageAbort
回呼方法;定義很簡單，而且只會測試方法是否
DrawImage
使用 Null
callBackData
參數呼叫它。 此範例的主要主體會執行下列動作：
建立回呼方法的
Graphics.DrawImageAbort
實例。
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，定義要在其中繪製影像的目的地矩形。
建立來源矩形，以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立要在其中繪製調整影像的其他目的地矩形。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未調整的目的地矩形，位置會找出畫面上的影像，以及來源矩形的大小，以及目的地矩形的大小和圖形會決定繪製影像的縮放比例。
由於此範例使用未傳遞
callBackData
參數的多載，回
Graphics.DrawImageAbort
呼會傳回
true
，這會導致
DrawImage
方法結束，而範例中包含的例外狀況處理常式代碼會列印出例外狀況文字，而不是繪製影像。
// Define DrawImageAbort callback method.
private:
bool DrawImageCallback5( IntPtr callBackData )
// Test for call that passes callBackData parameter.
if ( callBackData == IntPtr::Zero )
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private:
void DrawImageRect4IntAtrribAbort( PaintEventArgs^ e )
// Create callback method.
Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback5 );
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying original image.
Rectangle destRect1 = Rectangle(100,25,450,150);
// Create coordinates of rectangle for source image.
int x = 50;
int y = 50;
int width = 150;
int height = 150;
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );
// Create rectangle for adjusted image.
Rectangle destRect2 = Rectangle(100,175,450,150);
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr, imageCallback );
catch ( Exception^ ex )
e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
// Define DrawImageAbort callback method.
private bool DrawImageCallback5(IntPtr callBackData)
// Test for call that passes callBackData parameter.
if(callBackData==IntPtr.Zero)
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private void DrawImageRect4IntAtrribAbort(PaintEventArgs e)
// Create callback method.
Graphics.DrawImageAbort imageCallback
= new Graphics.DrawImageAbort(DrawImageCallback5);
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying original image.
Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
// Create coordinates of rectangle for source image.
int x = 50;
int y = 50;
int width = 150;
int height = 150;
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
// Create rectangle for adjusted image.
Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
checked
// Draw adjusted image to screen.
e.Graphics.DrawImage(
newImage,
destRect2,
x, y,
width, height,
units,
imageAttr,
imageCallback);
catch (Exception ex)
e.Graphics.DrawString(
ex.ToString(),
new Font("Arial", 8),
Brushes.Black,
new PointF(0, 0));
Private Function DrawImageCallback5(ByVal callBackData As IntPtr) As Boolean
' Test for call that passes callBackData parameter.
If callBackData.Equals(IntPtr.Zero) Then
' If no callBackData passed, abort DrawImage method.
Return True
' If callBackData passed, continue DrawImage method.
Return False
End If
End Function
Private Sub DrawImageRect4IntAtrribAbort(ByVal e As PaintEventArgs)
' Create callback method.
Dim imageCallback As New _
Graphics.DrawImageAbort(AddressOf DrawImageCallback5)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying original image.
Dim destRect1 As New Rectangle(100, 25, 450, 150)
' Create coordinates of rectangle for source image.
Dim x As Integer = 50
Dim y As Integer = 50
Dim width As Integer = 150
Dim height As Integer = 150
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, _
units)
' Create rectangle for adjusted image.
Dim destRect2 As New Rectangle(100, 175, 450, 150)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destRect2, x, y, width, _
height, units, imageAttr, imageCallback)
Catch ex As Exception
e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
Brushes.Black, New PointF(0, 0))
End Try
End Sub
srcX
、
srcY
、
srcWidth
和
srcHeight
參數會指定要繪製之
image
物件的矩形部分。 矩形相對於來源影像的左上角。 這個部分會縮放成符合 物件所
destRect
指定的矩形。
這個具有 參數的多
callback
載提供一旦根據應用程式所決定的準則來啟動影像繪圖的方法。 例如，應用程式可以開始繪製大型影像，而且使用者可能會將影像捲動到畫面上，在此情況下，應用程式可能會停止繪圖。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttrs, System::Drawing::Graphics::DrawImageAbort ^ callback);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttrs, System.Drawing.Graphics.DrawImageAbort callback);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttrs, System.Drawing.Graphics.DrawImageAbort? callback);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * single * single * single * single * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort -> unit
Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Single, srcY As Single, srcWidth As Single, srcHeight As Single, srcUnit As GraphicsUnit, imageAttrs As ImageAttributes, callback As Graphics.DrawImageAbort)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 程式碼會先定義委派的
Graphics.DrawImageAbort
回呼方法;定義很簡單，而且只會測試方法是否
DrawImage
使用 Null
callBackData
參數呼叫它。 範例的主本文會執行下列動作：
建立回呼方法的
Graphics.DrawImageAbort
實例。
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立用來定義繪製影像之目的地矩形的點。
建立來源矩形，以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立要在其中繪製調整影像的其他目的地矩形。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未合併的目的地矩形，位置會找出畫面上的影像，以及來源矩形的大小，以及目的地矩形的大小和圖形，會決定繪製影像的縮放比例。
因為這個範例使用不傳遞
callBackData
參數的多載，
Graphics.DrawImageAbort
所以回呼會
true
傳回 ，這會導致
DrawImage
方法結束，而範例中包含的例外狀況處理常式代碼會列印出例外狀況文字，而不是繪製影像。
// Define DrawImageAbort callback method.
private:
bool DrawImageCallback7( IntPtr callBackData )
// Test for call that passes callBackData parameter.
if ( callBackData == IntPtr::Zero )
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private:
void DrawImageRect4FloatAttribAbort( PaintEventArgs^ e )
// Create callback method.
Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback7 );
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying original image.
Rectangle destRect1 = Rectangle(100,25,450,150);
// Create coordinates of rectangle for source image.
float x = 50.0F;
float y = 50.0F;
float width = 150.0F;
float height = 150.0F;
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );
// Create rectangle for adjusted image.
Rectangle destRect2 = Rectangle(100,175,450,150);
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr, imageCallback );
catch ( Exception^ ex )
e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
// Define DrawImageAbort callback method.
private bool DrawImageCallback7(IntPtr callBackData)
// Test for call that passes callBackData parameter.
if(callBackData==IntPtr.Zero)
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private void DrawImageRect4FloatAttribAbort(PaintEventArgs e)
// Create callback method.
Graphics.DrawImageAbort imageCallback
= new Graphics.DrawImageAbort(DrawImageCallback7);
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying original image.
Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
// Create coordinates of rectangle for source image.
float x = 50.0F;
float y = 50.0F;
float width = 150.0F;
float height = 150.0F;
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
// Create rectangle for adjusted image.
Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
checked
// Draw adjusted image to screen.
e.Graphics.DrawImage(
newImage,
destRect2,
x, y,
width, height,
units,
imageAttr,
imageCallback);
catch (Exception ex)
e.Graphics.DrawString(
ex.ToString(),
new Font("Arial", 8),
Brushes.Black,
new PointF(0, 0));
Private Function DrawImageCallback7(ByVal callBackData As IntPtr) As Boolean
' Test for call that passes callBackData parameter.
If callBackData.Equals(IntPtr.Zero) Then
' If no callBackData passed, abort DrawImage method.
Return True
' If callBackData passed, continue DrawImage method.
Return False
End If
End Function
Private Sub DrawImageRect4FloatAttribAbort(ByVal e As PaintEventArgs)
' Create callback method.
Dim imageCallback As New _
Graphics.DrawImageAbort(AddressOf DrawImageCallback7)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying original image.
Dim destRect1 As New Rectangle(100, 25, 450, 150)
' Create coordinates of rectangle for source image.
Dim x As Single = 50.0F
Dim y As Single = 50.0F
Dim width As Single = 150.0F
Dim height As Single = 150.0F
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, _
height, units)
' Create rectangle for adjusted image.
Dim destRect2 As New Rectangle(100, 175, 450, 150)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destRect2, x, y, width, _
height, units, imageAttr, imageCallback)
Catch ex As Exception
e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
Brushes.Black, New PointF(0, 0))
End Try
End Sub
srcX
、
srcY
、
srcWidth
和
srcHeight
參數會指定要繪製之
image
物件的矩形部分。 矩形相對於來源影像的左上角。 這個部分會縮放為符合 參數所
destRect
指定的矩形。
具有 參數的
callback
這個多載會根據應用程式所決定的準則，提供停止影像繪製的方法。 例如，應用程式可以開始繪製大型影像，而使用者可能會從畫面捲動影像，在此情況下，應用程式可能會停止繪圖。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttrs, System::Drawing::Graphics::DrawImageAbort ^ callback, IntPtr callbackData);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttrs, System.Drawing.Graphics.DrawImageAbort callback, IntPtr callbackData);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttrs, System.Drawing.Graphics.DrawImageAbort? callback, IntPtr callbackData);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * int * int * int * int * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort * nativeint -> unit
Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Integer, srcY As Integer, srcWidth As Integer, srcHeight As Integer, srcUnit As GraphicsUnit, imageAttrs As ImageAttributes, callback As Graphics.DrawImageAbort, callbackData As IntPtr)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 程式碼會先定義委派的
Graphics.DrawImageAbort
回呼方法;定義很簡單，而且只會測試方法是否
DrawImage
使用 Null
callBackData
參數呼叫它。 範例的主本文會執行下列動作：
建立回呼方法的
Graphics.DrawImageAbort
實例。
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立用來定義繪製影像之目的地矩形的點。
建立來源矩形，以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立要在其中繪製調整影像的其他目的地矩形。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未合併的目的地矩形，位置會找出畫面上的影像，以及來源矩形的大小，以及目的地矩形的大小和圖形，會決定繪製影像的縮放比例。
因為這個範例會使用傳遞
callBackData
參數的多載，
Graphics.DrawImageAbort
所以回呼會
false
傳回 ，這會導致
DrawImage
方法繼續，而此範例會將調整後的影像繪製到畫面。
// Define DrawImageAbort callback method.
private:
bool DrawImageCallback6( IntPtr callBackData )
// Test for call that passes callBackData parameter.
if ( callBackData == IntPtr::Zero )
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private:
void DrawImageRect4IntAtrribAbortData( PaintEventArgs^ e )
// Create callback method.
Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback6 );
IntPtr imageCallbackData = IntPtr(1);
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying original image.
Rectangle destRect1 = Rectangle(100,25,450,150);
// Create coordinates of rectangle for source image.
int x = 50;
int y = 50;
int width = 150;
int height = 150;
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );
// Create rectangle for adjusted image.
Rectangle destRect2 = Rectangle(100,175,450,150);
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr, imageCallback, imageCallbackData );
catch ( Exception^ ex )
e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
// Define DrawImageAbort callback method.
private bool DrawImageCallback6(IntPtr callBackData)
// Test for call that passes callBackData parameter.
if(callBackData==IntPtr.Zero)
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private void DrawImageRect4IntAtrribAbortData(PaintEventArgs e)
// Create callback method.
Graphics.DrawImageAbort imageCallback
= new Graphics.DrawImageAbort(DrawImageCallback6);
IntPtr imageCallbackData = new IntPtr(1);
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying original image.
Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
// Create coordinates of rectangle for source image.
int x = 50;
int y = 50;
int width = 150;
int height = 150;
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
// Create rectangle for adjusted image.
Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
checked
// Draw adjusted image to screen.
e.Graphics.DrawImage(
newImage,
destRect2,
x, y,
width, height,
units,
imageAttr,
imageCallback,
imageCallbackData);
catch (Exception ex)
e.Graphics.DrawString(
ex.ToString(),
new Font("Arial", 8),
Brushes.Black,
new PointF(0, 0));
Private Function DrawImageCallback6(ByVal callBackData As IntPtr) As Boolean
' Test for call that passes callBackData parameter.
If callBackData.Equals(IntPtr.Zero) Then
' If no callBackData passed, abort DrawImage method.
Return True
' If callBackData passed, continue DrawImage method.
Return False
End If
End Function
Private Sub DrawImageRect4IntAtrribAbortData(ByVal e As PaintEventArgs)
' Create callback method.
Dim imageCallback As New _
Graphics.DrawImageAbort(AddressOf DrawImageCallback6)
Dim imageCallbackData As New IntPtr(1)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying original image.
Dim destRect1 As New Rectangle(100, 25, 450, 150)
' Create coordinates of rectangle for source image.
Dim x As Integer = 50
Dim y As Integer = 50
Dim width As Integer = 150
Dim height As Integer = 150
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, _
units)
' Create rectangle for adjusted image.
Dim destRect2 As New Rectangle(100, 175, 450, 150)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destRect2, x, y, width, _
height, units, imageAttr, imageCallback, imageCallbackData)
Catch ex As Exception
e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
Brushes.Black, New PointF(0, 0))
End Try
End Sub
srcX
、
srcY
、
srcWidth
和
srcHeight
參數會指定要繪製之
image
物件的矩形部分。 矩形相對於來源影像的左上角。 這個部分會縮放為符合 參數所
destRect
指定的矩形。
具有 和
callbackData
參數的
callback
這個多載提供方法，一旦根據應用程式所決定的準則和資料開始，即可停止影像的繪製。 例如，應用程式可以開始繪製大型影像，而使用者可能會從畫面捲動影像，在此情況下，應用程式可能會停止繪圖。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttrs, System::Drawing::Graphics::DrawImageAbort ^ callback, IntPtr callbackData);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttrs, System.Drawing.Graphics.DrawImageAbort callback, IntPtr callbackData);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttrs, System.Drawing.Graphics.DrawImageAbort? callback, IntPtr callbackData);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * single * single * single * single * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort * nativeint -> unit
Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Single, srcY As Single, srcWidth As Single, srcHeight As Single, srcUnit As GraphicsUnit, imageAttrs As ImageAttributes, callback As Graphics.DrawImageAbort, callbackData As IntPtr)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 程式碼會先定義委派的
Graphics.DrawImageAbort
回呼方法;定義很簡單，而且只會測試方法是否
DrawImage
使用 Null
callBackData
參數呼叫它。 範例的主本文會執行下列動作：
建立回呼方法的
Graphics.DrawImageAbort
實例。
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立用來定義繪製影像之目的地矩形的點。
建立來源矩形，以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立要在其中繪製調整影像的其他目的地矩形。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未合併的目的地矩形，位置會找出畫面上的影像，以及來源矩形的大小，以及目的地矩形的大小和圖形，會決定繪製影像的縮放比例。
因為這個範例會使用傳遞
callBackData
參數的多載，
Graphics.DrawImageAbort
所以回呼會
false
傳回 ，這會導致
DrawImage
方法繼續，而此範例會將調整後的影像繪製到畫面。
// Define DrawImageAbort callback method.
private:
bool DrawImageCallback8( IntPtr callBackData )
// Test for call that passes callBackData parameter.
if ( callBackData == IntPtr::Zero )
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
public:
void DrawImageRect4FloatAttribAbortData( PaintEventArgs^ e )
// Create callback method.
Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback8 );
IntPtr imageCallbackData = IntPtr(1);
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying original image.
Rectangle destRect1 = Rectangle(100,25,450,150);
// Create coordinates of rectangle for source image.
float x = 50.0F;
float y = 50.0F;
float width = 150.0F;
float height = 150.0F;
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );
// Create rectangle for adjusted image.
Rectangle destRect2 = Rectangle(100,175,450,150);
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr, imageCallback, imageCallbackData );
catch ( Exception^ ex )
e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
// Define DrawImageAbort callback method.
private bool DrawImageCallback8(IntPtr callBackData)
// Test for call that passes callBackData parameter.
if(callBackData==IntPtr.Zero)
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
public void DrawImageRect4FloatAttribAbortData(PaintEventArgs e)
// Create callback method.
Graphics.DrawImageAbort imageCallback
= new Graphics.DrawImageAbort(DrawImageCallback8);
IntPtr imageCallbackData = new IntPtr(1);
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying original image.
Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
// Create coordinates of rectangle for source image.
float x = 50.0F;
float y = 50.0F;
float width = 150.0F;
float height = 150.0F;
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
// Create rectangle for adjusted image.
Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
// Draw adjusted image to screen.
checked
// Draw adjusted image to screen.
e.Graphics.DrawImage(
newImage,
destRect2,
x, y,
width, height,
units,
imageAttr,
imageCallback,
imageCallbackData);
catch (Exception ex)
e.Graphics.DrawString(
ex.ToString(),
new Font("Arial", 8),
Brushes.Black,
new PointF(0, 0));
Private Function DrawImageCallback8(ByVal callBackData As IntPtr) As Boolean
' Test for call that passes callBackData parameter.
If callBackData.Equals(IntPtr.Zero) Then
' If no callBackData passed, abort DrawImage method.
Return True
' If callBackData passed, continue DrawImage method.
Return False
End If
End Function
Public Sub DrawImageRect4FloatAttribAbortData(ByVal e As PaintEventArgs)
' Create callback method.
Dim imageCallback As New _
Graphics.DrawImageAbort(AddressOf DrawImageCallback8)
Dim imageCallbackData As New IntPtr(1)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying original image.
Dim destRect1 As New Rectangle(100, 25, 450, 150)
' Create coordinates of rectangle for source image.
Dim x As Single = 50.0F
Dim y As Single = 50.0F
Dim width As Single = 150.0F
Dim height As Single = 150.0F
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, _
height, units)
' Create rectangle for adjusted image.
Dim destRect2 As New Rectangle(100, 175, 450, 150)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destRect2, x, y, width, _
height, units, imageAttr, imageCallback, imageCallbackData)
Catch ex As Exception
e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
Brushes.Black, New PointF(0, 0))
End Try
End Sub
srcX
、
srcY
、
srcWidth
和
srcHeight
參數會指定要繪製之
image
物件的矩形部分。 矩形相對於來源影像的左上角。 這個部分會縮放為符合 參數所
destRect
指定的矩形。
具有 和
callbackData
參數的
callback
這個多載提供方法，一旦根據應用程式所決定的準則和資料開始，即可停止影像的繪製。 例如，應用程式可以開始繪製大型影像，而使用者可能會從畫面捲動影像，在此情況下，應用程式可能會停止繪圖。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttr);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * int * int * int * int * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit
Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Integer, srcY As Integer, srcWidth As Integer, srcHeight As Integer, srcUnit As GraphicsUnit, imageAttr As ImageAttributes)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像的目的地矩形。
建立來源矩形的座標，以從中擷取影像的一部分。
將來源矩形的測量單位設定為圖元。
將原始影像繪製到畫面。
建立要在其中繪製調整影像的額外矩形。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未調整的目的地矩形，位置會找出畫面上的影像，而來源和目的地矩形的大小會決定繪製影像的縮放比例，而來源矩形的大小會決定原始影像的哪個部分繪製到螢幕。
void DrawImageRect4IntAtrrib( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying original image.
Rectangle destRect1 = Rectangle(100,25,450,150);
// Create coordinates of rectangle for source image.
int x = 50;
int y = 50;
int width = 150;
int height = 150;
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );
// Create rectangle for adjusted image.
Rectangle destRect2 = Rectangle(100,175,450,150);
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr );
private void DrawImageRect4IntAtrrib(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying original image.
Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
// Create coordinates of rectangle for source image.
int x = 50;
int y = 50;
int width = 150;
int height = 150;
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
// Create rectangle for adjusted image.
Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
// Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destRect2, x, y, width, height, units, imageAttr);
Private Sub DrawImageRect4IntAtrrib(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying original image.
Dim destRect1 As New Rectangle(100, 25, 450, 150)
' Create coordinates of rectangle for source image.
Dim x As Integer = 50
Dim y As Integer = 50
Dim width As Integer = 150
Dim height As Integer = 150
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, _
units)
' Create rectangle for adjusted image.
Dim destRect2 As New Rectangle(100, 175, 450, 150)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destRect2, x, y, width, height, _
units, imageAttr)
End Sub
srcX
、
srcY
、
srcWidth
和
srcHeight
參數會指定要繪製之
image
物件的矩形部分。 矩形相對於來源影像的左上角。 這個部分會調整為符合 參數所
destRect
指定矩形內的大小。
public:
void DrawImage(System::Drawing::Image ^ image, int x, int y, int width, int height);
public void DrawImage (System.Drawing.Image image, int x, int y, int width, int height);
member this.DrawImage : System.Drawing.Image * int * int * int * int -> unit
Public Sub DrawImage (image As Image, x As Integer, y As Integer, width As Integer, height As Integer)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像之矩形的位置和大小。
將影像繪製到畫面。
矩形的位置會找出畫面上的影像，而原始影像的大小和矩形的大小會決定繪製影像的縮放比例。
public:
void DrawImage4Int( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create coordinates for upper-left corner.
// of image and for size of image.
int x = 100;
int y = 100;
int width = 450;
int height = 150;
// Draw image to screen.
e->Graphics->DrawImage( newImage, x, y, width, height );
public void DrawImage4Int(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create coordinates for upper-left corner.
// of image and for size of image.
int x = 100;
int y = 100;
int width = 450;
int height = 150;
// Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, width, height);
Public Sub DrawImage4Int(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create coordinates for upper-left corner
' of image and for size of image.
Dim x As Integer = 100
Dim y As Integer = 100
Dim width As Integer = 450
Dim height As Integer = 150
' Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, width, height)
End Sub
、
y
、
width
和
height
參數所
x
定義的矩形會決定繪製影像的位置和大小。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback, int callbackData);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttr, System.Drawing.Graphics.DrawImageAbort callback, int callbackData);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback, int callbackData);
member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] * System.Drawing.Rectangle * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort * int -> unit
Public Sub DrawImage (image As Image, destPoints As Point(), srcRect As Rectangle, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort, callbackData As Integer)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 程式碼會先定義委派的
Graphics.DrawImageAbort
回呼方法;定義很簡單，而且只會測試方法是否
DrawImage
使用 Null
callBackData
參數呼叫它。 此範例的主要主體會執行下列動作：
建立回呼方法的
Graphics.DrawImageAbort
實例。
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，定義要在其中繪製影像的平行投影。
建立矩形以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立額外的平行投影，在其中繪製調整後的影像。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未調整的平行投影，位置會找出螢幕上的影像，而矩形的大小和平行投影的大小和圖形會決定繪製影像的縮放和切割。
因為這個範例會使用傳遞
callBackData
參數的多載，所以
Graphics.DrawImageAbort
回呼會傳回
false
，這會導致
DrawImage
方法繼續，而此範例會將調整後的影像繪製到畫面。
// Define DrawImageAbort callback method.
private:
bool DrawImageCallback2( IntPtr callBackData )
// Test for call that passes callBackData parameter.
if ( callBackData == IntPtr::Zero )
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private:
void DrawImageParaRectAttribAbortData( PaintEventArgs^ e )
// Create callback method.
Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback2 );
int imageCallbackData = 1;
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing original image.
Point ulCorner = Point(100,100);
Point urCorner = Point(550,100);
Point llCorner = Point(150,250);
array<Point>^ destPara1 = {ulCorner,urCorner,llCorner};
// Create rectangle for source image.
Rectangle srcRect = Rectangle(50,50,150,150);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destPara1, srcRect, units );
// Create parallelogram for drawing adjusted image.
Point ulCorner2 = Point(325,100);
Point urCorner2 = Point(550,100);
Point llCorner2 = Point(375,250);
array<Point>^ destPara2 = {ulCorner2,urCorner2,llCorner2};
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw image to screen.
e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr, imageCallback, imageCallbackData );
catch ( Exception^ ex )
e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
// Define DrawImageAbort callback method.
private bool DrawImageCallback2(IntPtr callBackData)
// Test for call that passes callBackData parameter.
if(callBackData==IntPtr.Zero)
// If no callBackData passed, abort DrawImage method.
return true;
// If callBackData passed, continue DrawImage method.
return false;
private void DrawImageParaRectAttribAbortData(PaintEventArgs e)
// Create callback method.
Graphics.DrawImageAbort imageCallback
= new Graphics.DrawImageAbort(DrawImageCallback2);
int imageCallbackData = 1;
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing original image.
Point ulCorner = new Point(100, 100);
Point urCorner = new Point(550, 100);
Point llCorner = new Point(150, 250);
Point[] destPara1 = {ulCorner, urCorner, llCorner};
// Create rectangle for source image.
Rectangle srcRect = new Rectangle(50, 50, 150, 150);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
// Create parallelogram for drawing adjusted image.
Point ulCorner2 = new Point(325, 100);
Point urCorner2 = new Point(550, 100);
Point llCorner2 = new Point(375, 250);
Point[] destPara2 = {ulCorner2, urCorner2, llCorner2};
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
checked
// Draw image to screen.
e.Graphics.DrawImage(
newImage,
destPara2,
srcRect,
units,
imageAttr,
imageCallback,
imageCallbackData);
catch (Exception ex)
e.Graphics.DrawString(
ex.ToString(),
new Font("Arial", 8),
Brushes.Black,
new PointF(0, 0));
Private Function DrawImageCallback2(ByVal callBackData As IntPtr) As Boolean
' Test for call that passes callBackData parameter.
If callBackData.Equals(IntPtr.Zero) Then
' If no callBackData passed, abort DrawImage method.
Return True
' If callBackData passed, continue DrawImage method.
Return False
End If
End Function
Private Sub DrawImageParaRectAttribAbortData(ByVal e As PaintEventArgs)
' Create callback method.
Dim imageCallback As New _
Graphics.DrawImageAbort(AddressOf DrawImageCallback2)
Dim imageCallbackData As Integer = 1
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing original image.
Dim ulCorner As New Point(100, 100)
Dim urCorner As New Point(550, 100)
Dim llCorner As New Point(150, 250)
Dim destPara1 As Point() = {ulCorner, urCorner, llCorner}
' Create rectangle for source image.
Dim srcRect As New Rectangle(50, 50, 150, 150)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units)
' Create parallelogram for drawing adjusted image.
Dim ulCorner2 As New Point(325, 100)
Dim urCorner2 As New Point(550, 100)
Dim llCorner2 As New Point(375, 250)
Dim destPara2 As Point() = {ulCorner2, urCorner2, llCorner2}
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
imageAttr, imageCallback, imageCallbackData)
Catch ex As Exception
e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
Brushes.Black, New PointF(0, 0))
End Try
End Sub
參數
destPoints
會指定平行投影的三點。 這三
PointF
個結構代表平行投影的左上角、右上角和左下角。 第四個點會從前三個推斷為形成平行投影。
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影。
具有 和
callbackData
參數的
callback
這個多載提供一旦根據應用程式所決定的準則和資料來啟動影像繪圖的方法。 例如，應用程式可以開始繪製大型影像，而且使用者可能會將影像捲動到畫面上，在此情況下，應用程式可能會停止繪圖。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttr);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr);
member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] * System.Drawing.RectangleF * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit
Public Sub DrawImage (image As Image, destPoints As PointF(), srcRect As RectangleF, srcUnit As GraphicsUnit, imageAttr As ImageAttributes)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，定義要在其中繪製影像的目的地平行投影。
建立來源矩形，從中擷取影像的一部分。
將來源矩形的測量單位設定為圖元。
將原始影像繪製到畫面。
建立額外的平行投影，在其中繪製調整後的影像。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未調整的目的地平行投影，位置會找出畫面上的影像、來源矩形的大小，以及目的地平行投影的大小和圖形會決定繪製影像的縮放和切割，而矩形的大小會決定原始影像的繪製位置。
void DrawImageParaFRectFAttrib( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing original image.
PointF ulCorner1 = PointF(100.0F,100.0F);
PointF urCorner1 = PointF(325.0F,100.0F);
PointF llCorner1 = PointF(150.0F,250.0F);
array<PointF>^ destPara1 = {ulCorner1,urCorner1,llCorner1};
// Create rectangle for source image.
RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
GraphicsUnit units = GraphicsUnit::Pixel;
// Create parallelogram for drawing adjusted image.
PointF ulCorner2 = PointF(325.0F,100.0F);
PointF urCorner2 = PointF(550.0F,100.0F);
PointF llCorner2 = PointF(375.0F,250.0F);
array<PointF>^ destPara2 = {ulCorner2,urCorner2,llCorner2};
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destPara1, srcRect, units );
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr );
private void DrawImageParaFRectFAttrib(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing original image.
PointF ulCorner1 = new PointF(100.0F, 100.0F);
PointF urCorner1 = new PointF(325.0F, 100.0F);
PointF llCorner1 = new PointF(150.0F, 250.0F);
PointF[] destPara1 = {ulCorner1, urCorner1, llCorner1};
// Create rectangle for source image.
RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
GraphicsUnit units = GraphicsUnit.Pixel;
// Create parallelogram for drawing adjusted image.
PointF ulCorner2 = new PointF(325.0F, 100.0F);
PointF urCorner2 = new PointF(550.0F, 100.0F);
PointF llCorner2 = new PointF(375.0F, 250.0F);
PointF[] destPara2 = {ulCorner2, urCorner2, llCorner2};
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
// Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, imageAttr);
Private Sub DrawImageParaFRectFAttrib(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing original image.
Dim ulCorner1 As New PointF(100.0F, 100.0F)
Dim urCorner1 As New PointF(325.0F, 100.0F)
Dim llCorner1 As New PointF(150.0F, 250.0F)
Dim destPara1 As PointF() = {ulCorner1, urCorner1, llCorner1}
' Create rectangle for source image.
Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Create parallelogram for drawing adjusted image.
Dim ulCorner2 As New PointF(325.0F, 100.0F)
Dim urCorner2 As New PointF(550.0F, 100.0F)
Dim llCorner2 As New PointF(375.0F, 250.0F)
Dim destPara2 As PointF() = {ulCorner2, urCorner2, llCorner2}
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units)
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
imageAttr)
End Sub
參數
destPoints
會指定平行投影的三點。 這三
PointF
個結構代表平行投影的左上角、右上角和左下角。 第四個點會從前三個推斷為形成平行投影。
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Point point);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point point);
member this.DrawImage : System.Drawing.Image * System.Drawing.Point -> unit
Public Sub DrawImage (image As Image, point As Point)
下列程式碼範例是設計來搭配Windows Forms使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要繪製影像左上角的點。
將未調整的影像繪製到畫面。
private:
void DrawImagePoint( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create Point for upper-left corner of image.
Point ulCorner = Point(100,100);
// Draw image to screen.
e->Graphics->DrawImage( newImage, ulCorner );
private void DrawImagePoint(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create Point for upper-left corner of image.
Point ulCorner = new Point(100, 100);
// Draw image to screen.
e.Graphics.DrawImage(newImage, ulCorner);
Private Sub DrawImagePoint(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create Point for upper-left corner of image.
Dim ulCorner As New Point(100, 100)
' Draw image to screen.
e.Graphics.DrawImage(newImage, ulCorner)
End Sub
會
Image
儲存圖元寬度的值，以及水準解析度的值， (每英吋的點數) 。 以英吋為單位的影像實體寬度是圖元寬度除以水準解析度。 例如，圖元寬度為 216 的影像，而水準解析度為每英吋 72 點，其實體寬度為 3 英吋。 類似備註適用于圖元高度和實體高度。
此方法會使用其實體大小繪製影像，因此無論顯示裝置的解析度 (點的解析度為何，影像都會以英吋為單位) 正確大小。 例如，假設影像的圖元寬度為 216，而水準解析度為每英吋 72 個點。 如果您呼叫這個方法，在解析度為每英吋 96 點的裝置上繪製該影像，轉譯影像的圖元寬度將會 (216/72) *96 = 288。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints);
member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] -> unit
Public Sub DrawImage (image As Image, destPoints As Point())
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，以定義用來繪製影像的平行投影。
將影像繪製到畫面。
平行投影的位置會找出螢幕上的影像，以及原始影像的大小，以及平行投影的大小和形狀，會決定繪製影像的縮放比例和切割。
private:
void DrawImagePara( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing image.
Point ulCorner = Point(100,100);
Point urCorner = Point(550,100);
Point llCorner = Point(150,250);
array<Point>^ destPara = {ulCorner,urCorner,llCorner};
// Draw image to screen.
e->Graphics->DrawImage( newImage, destPara );
private void DrawImagePara(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing image.
Point ulCorner = new Point(100, 100);
Point urCorner = new Point(550, 100);
Point llCorner = new Point(150, 250);
Point[] destPara = {ulCorner, urCorner, llCorner};
// Draw image to screen.
e.Graphics.DrawImage(newImage, destPara);
Private Sub DrawImagePara(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing image.
Dim ulCorner As New Point(100, 100)
Dim urCorner As New Point(550, 100)
Dim llCorner As New Point(150, 250)
Dim destPara As Point() = {ulCorner, urCorner, llCorner}
' Draw image to screen.
e.Graphics.DrawImage(newImage, destPara)
End Sub
參數
destPoints
會指定平行投影的三個點。 這三個
Point
結構代表平行投影的左上角、右上角和左下角。 第四個點是從前三個點推斷，以形成平行投影。
參數所
image
代表的影像會進行縮放和切割，以符合參數所
destPoints
指定的平行投影圖形。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::PointF point);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF point);
member this.DrawImage : System.Drawing.Image * System.Drawing.PointF -> unit
Public Sub DrawImage (image As Image, point As PointF)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要繪製影像左上角的點。
將未調整的影像繪製到畫面。
private:
void DrawImagePointF( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create point for upper-left corner of image.
PointF ulCorner = PointF(100.0F,100.0F);
// Draw image to screen.
e->Graphics->DrawImage( newImage, ulCorner );
private void DrawImagePointF(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create point for upper-left corner of image.
PointF ulCorner = new PointF(100.0F, 100.0F);
// Draw image to screen.
e.Graphics.DrawImage(newImage, ulCorner);
Private Sub DrawImagePointF(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create point for upper-left corner of image.
Dim ulCorner As New PointF(100.0F, 100.0F)
' Draw image to screen.
e.Graphics.DrawImage(newImage, ulCorner)
End Sub
會
Image
儲存圖元寬度的值，以及水準解析度的值， (每英吋的點數) 。 以英吋為單位的影像實體寬度是圖元寬度除以水準解析度。 例如，圖元寬度為 216 的影像，而水準解析度為每英吋 72 點，其實體寬度為 3 英吋。 類似備註適用于圖元高度和實體高度。
此方法會使用其實體大小繪製影像，因此無論顯示裝置的解析度 (點的解析度為何，影像都會以英吋為單位) 正確大小。 例如，假設影像的圖元寬度為 216，而水準解析度為每英吋 72 個點。 如果您呼叫這個方法，在解析度為每英吋 96 點的裝置上繪製該影像，轉譯影像的圖元寬度將會 (216/72) *96 = 288。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints);
member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] -> unit
Public Sub DrawImage (image As Image, destPoints As PointF())
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，以定義用來繪製影像的平行投影。
將影像繪製到畫面。
平行投影的位置會找出螢幕上的影像，以及原始影像的大小，以及平行投影的大小和形狀，會決定繪製影像的縮放比例和切割。
private:
void DrawImageParaF( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing image.
PointF ulCorner = PointF(100.0F,100.0F);
PointF urCorner = PointF(550.0F,100.0F);
PointF llCorner = PointF(150.0F,250.0F);
array<PointF>^ destPara = {ulCorner,urCorner,llCorner};
// Draw image to screen.
e->Graphics->DrawImage( newImage, destPara );
private void DrawImageParaF(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing image.
PointF ulCorner = new PointF(100.0F, 100.0F);
PointF urCorner = new PointF(550.0F, 100.0F);
PointF llCorner = new PointF(150.0F, 250.0F);
PointF[] destPara = {ulCorner, urCorner, llCorner};
// Draw image to screen.
e.Graphics.DrawImage(newImage, destPara);
Private Sub DrawImageParaF(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing image.
Dim ulCorner As New PointF(100.0F, 100.0F)
Dim urCorner As New PointF(550.0F, 100.0F)
Dim llCorner As New PointF(150.0F, 250.0F)
Dim destPara As PointF() = {ulCorner, urCorner, llCorner}
' Draw image to screen.
e.Graphics.DrawImage(newImage, destPara)
End Sub
參數
destPoints
會指定平行投影的三個點。 這三個
PointF
結構代表平行投影的左上角、右上角和左下角。 第四個點是從前三個點推斷，以形成平行投影。
物件所代表的
image
影像會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影圖形。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle rect);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle rect);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle -> unit
Public Sub DrawImage (image As Image, rect As Rectangle)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像的矩形。
將影像繪製到畫面。
矩形的位置會找出畫面上的影像，而原始影像的大小和矩形的大小會決定繪製影像的縮放比例。
private:
void DrawImageRect( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying image.
Rectangle destRect = Rectangle(100,100,450,150);
// Draw image to screen.
e->Graphics->DrawImage( newImage, destRect );
private void DrawImageRect(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying image.
Rectangle destRect = new Rectangle(100, 100, 450, 150);
// Draw image to screen.
e.Graphics.DrawImage(newImage, destRect);
Private Sub DrawImageRect(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying image.
Dim destRect As New Rectangle(100, 100, 450, 150)
' Draw image to screen.
e.Graphics.DrawImage(newImage, destRect)
End Sub
物件所
image
代表的影像會縮放至矩形的
rect
維度。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::RectangleF rect);
public void DrawImage (System.Drawing.Image image, System.Drawing.RectangleF rect);
member this.DrawImage : System.Drawing.Image * System.Drawing.RectangleF -> unit
Public Sub DrawImage (image As Image, rect As RectangleF)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像的矩形。
將影像繪製到畫面。
矩形的位置會在畫面上找到影像，而影像的原始大小和矩形的大小會決定繪製影像的縮放比例。
public:
void DrawImageRectF( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying image.
RectangleF rect = RectangleF(100.0F,100.0F,450.0F,150.0F);
// Draw image to screen.
e->Graphics->DrawImage( newImage, rect );
public void DrawImageRectF(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying image.
RectangleF rect = new RectangleF(100.0F, 100.0F, 450.0F, 150.0F);
// Draw image to screen.
e.Graphics.DrawImage(newImage, rect);
Public Sub DrawImageRectF(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying image.
Dim rect As New RectangleF(100.0F, 100.0F, 450.0F, 150.0F)
' Draw image to screen.
e.Graphics.DrawImage(newImage, rect)
End Sub
物件所
image
代表的影像會縮放至矩形的
rect
維度。
public:
void DrawImage(System::Drawing::Image ^ image, int x, int y);
public void DrawImage (System.Drawing.Image image, int x, int y);
member this.DrawImage : System.Drawing.Image * int * int -> unit
Public Sub DrawImage (image As Image, x As Integer, y As Integer)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射SampImag.jpg範例資料夾中。
建立要繪製影像左上角之點的座標。
繪製未調整的影像。
public:
void DrawImage2Int( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create coordinates for upper-left corner of image.
int x = 100;
int y = 100;
// Draw image to screen.
e->Graphics->DrawImage( newImage, x, y );
public void DrawImage2Int(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create coordinates for upper-left corner of image.
int x = 100;
int y = 100;
// Draw image to screen.
e.Graphics.DrawImage(newImage, x, y);
Public Sub DrawImage2Int(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create coordinates for upper-left corner of image.
Dim x As Integer = 100
Dim y As Integer = 100
' Draw image to screen.
e.Graphics.DrawImage(newImage, x, y)
End Sub
會
Image
儲存圖元寬度的值，以及水準解析度的值， (每英吋的點數) 。 以英吋為單位的影像實體寬度是圖元寬度除以水準解析度。 例如，圖元寬度為 216 的影像，而水準解析度為每英吋 72 點，其實體寬度為 3 英吋。 類似備註適用于圖元高度和實體高度。
方法
DrawImage
會使用其實體大小繪製影像，因此無論顯示裝置的解析度 (點) 解析度為何，影像都會有正確的大小。 例如，假設影像的圖元寬度為 216，而水準解析度為每英吋 72 個點。 如果您在
DrawImage
解析度為 96 英吋的裝置上呼叫繪製該影像，轉譯影像的圖元寬度將會 (216/72) *96 = 288。
public:
void DrawImage(System::Drawing::Image ^ image, int x, int y, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit);
public void DrawImage (System.Drawing.Image image, int x, int y, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit);
member this.DrawImage : System.Drawing.Image * int * int * System.Drawing.Rectangle * System.Drawing.GraphicsUnit -> unit
Public Sub DrawImage (image As Image, x As Integer, y As Integer, srcRect As Rectangle, srcUnit As GraphicsUnit)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要繪製影像左上角的座標。
建立要從中擷取影像部分的來源矩形。
將來源矩形的測量單位設定為圖元。
將影像繪製到畫面。
來源矩形的大小會決定未調整原始影像的哪個部分繪製到螢幕。
public:
void DrawImage2IntRect( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create coordinates for upper-left corner of image.
int x = 100;
int y = 100;
// Create rectangle for source image.
Rectangle srcRect = Rectangle(50,50,150,150);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw image to screen.
e->Graphics->DrawImage( newImage, x, y, srcRect, units );
public void DrawImage2IntRect(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create coordinates for upper-left corner of image.
int x = 100;
int y = 100;
// Create rectangle for source image.
Rectangle srcRect = new Rectangle(50, 50, 150, 150);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, srcRect, units);
Public Sub DrawImage2IntRect(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create coordinates for upper-left corner of image.
Dim x As Integer = 100
Dim y As Integer = 100
' Create rectangle for source image.
Dim srcRect As New Rectangle(50, 50, 150, 150)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, srcRect, units)
End Sub
會
Image
儲存圖元寬度的值，以及水準解析度的值， (每英吋的點數) 。 以英吋為單位的影像實體寬度是圖元寬度除以水準解析度。 例如，圖元寬度為 360 且水準解析度為每英吋 72 點的影像，其實體寬度為 5 英吋。 類似備註適用于圖元高度和實體高度。
此方法會使用其實體大小繪製影像的一部分，因此影像部分的大小會以英吋為單位，不論顯示器裝置的解析度 (每英吋的點數) 為何。 例如，假設影像部分的圖元寬度為 216，而水準解析度為每英吋 72 點。 如果您呼叫這個方法，在解析度為 96 點的裝置上繪製該影像部分，轉譯影像部分的圖元寬度將會 (216/72) *96 = 288。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit);
member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] * System.Drawing.Rectangle * System.Drawing.GraphicsUnit -> unit
Public Sub DrawImage (image As Image, destPoints As Point(), srcRect As Rectangle, srcUnit As GraphicsUnit)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，以定義用來繪製影像的平行投影。
建立矩形以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將影像繪製到畫面。
平行投影的位置會找出螢幕上的影像，而矩形的大小以及平行投影的大小和形狀，會決定繪製影像的縮放和切割。
private:
void DrawImageParaRect( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing image.
Point ulCorner = Point(100,100);
Point urCorner = Point(325,100);
Point llCorner = Point(150,250);
array<Point>^ destPara = {ulCorner,urCorner,llCorner};
// Create rectangle for source image.
Rectangle srcRect = Rectangle(50,50,150,150);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw image to screen.
e->Graphics->DrawImage( newImage, destPara, srcRect, units );
private void DrawImageParaRect(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing image.
Point ulCorner = new Point(100, 100);
Point urCorner = new Point(325, 100);
Point llCorner = new Point(150, 250);
Point[] destPara = {ulCorner, urCorner, llCorner};
// Create rectangle for source image.
Rectangle srcRect = new Rectangle(50, 50, 150, 150);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, destPara, srcRect, units);
Private Sub DrawImageParaRect(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing image.
Dim ulCorner As New Point(100, 100)
Dim urCorner As New Point(325, 100)
Dim llCorner As New Point(150, 250)
Dim destPara As Point() = {ulCorner, urCorner, llCorner}
' Create rectangle for source image.
Dim srcRect As New Rectangle(50, 50, 150, 150)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, destPara, srcRect, units)
End Sub
參數
destPoints
會指定平行投影的三個點。 這三個
Point
結構代表平行投影的左上角、右上角和左下角。 第四個點是從前三個點推斷，以形成平行投影。
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影。
public:
void DrawImage(System::Drawing::Image ^ image, float x, float y);
public void DrawImage (System.Drawing.Image image, float x, float y);
member this.DrawImage : System.Drawing.Image * single * single -> unit
Public Sub DrawImage (image As Image, x As Single, y As Single)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要繪製影像左上角之點的座標。
將未調整的影像繪製到畫面。
public:
void DrawImage2Float( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create coordinates for upper-left corner of image.
float x = 100.0F;
float y = 100.0F;
// Draw image to screen.
e->Graphics->DrawImage( newImage, x, y );
public void DrawImage2Float(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create coordinates for upper-left corner of image.
float x = 100.0F;
float y = 100.0F;
// Draw image to screen.
e.Graphics.DrawImage(newImage, x, y);
Public Sub DrawImage2Float(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create coordinates for upper-left corner of image.
Dim x As Single = 100.0F
Dim y As Single = 100.0F
' Draw image to screen.
e.Graphics.DrawImage(newImage, x, y)
End Sub
會
Image
儲存圖元寬度的值，以及水準解析度的值， (每英吋的點數) 。 以英吋為單位的影像實體寬度是圖元寬度除以水準解析度。 例如，圖元寬度為 216 的影像，而水準解析度為每英吋 72 點，其實體寬度為 3 英吋。 類似備註適用于圖元高度和實體高度。
此方法會使用其實體大小繪製影像，因此無論顯示裝置的解析度 (點的解析度為何，影像都會以英吋為單位) 正確大小。 例如，假設影像的圖元寬度為 216，而水準解析度為每英吋 72 個點。 如果您呼叫這個方法，在解析度為每英吋 96 點的裝置上繪製該影像，轉譯影像的圖元寬度將會 (216/72) *96 = 288。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit);
public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit);
member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] * System.Drawing.RectangleF * System.Drawing.GraphicsUnit -> unit
Public Sub DrawImage (image As Image, destPoints As PointF(), srcRect As RectangleF, srcUnit As GraphicsUnit)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，以定義用來繪製影像的目的地平行投影。
建立要從中擷取影像部分的來源矩形。
將來源矩形的測量單位設定為圖元。
將影像繪製到畫面。
目的地平行投影的位置會找出螢幕上的影像、來源矩形的大小，以及目的地平行投影的大小和圖形，會決定繪製影像的縮放和切割，而矩形的大小會決定原始影像的繪製到畫面的哪個部分。
private:
void DrawImageParaFRectF( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing image.
PointF ulCorner = PointF(100.0F,100.0F);
PointF urCorner = PointF(550.0F,100.0F);
PointF llCorner = PointF(150.0F,250.0F);
array<PointF>^ destPara = {ulCorner,urCorner,llCorner};
// Create rectangle for source image.
RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw image to screen.
e->Graphics->DrawImage( newImage, destPara, srcRect, units );
private void DrawImageParaFRectF(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing image.
PointF ulCorner = new PointF(100.0F, 100.0F);
PointF urCorner = new PointF(550.0F, 100.0F);
PointF llCorner = new PointF(150.0F, 250.0F);
PointF[] destPara = {ulCorner, urCorner, llCorner};
// Create rectangle for source image.
RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, destPara, srcRect, units);
Private Sub DrawImageParaFRectF(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing image.
Dim ulCorner As New PointF(100.0F, 100.0F)
Dim urCorner As New PointF(550.0F, 100.0F)
Dim llCorner As New PointF(150.0F, 250.0F)
Dim destPara As PointF() = {ulCorner, urCorner, llCorner}
' Create rectangle for source image.
Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, destPara, srcRect, units)
End Sub
參數
destPoints
會指定平行投影的三個點。 這三個
PointF
結構代表平行投影的左上角、右上角和左下角。 第四個點是從前三個點推斷，以形成平行投影。
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit);
public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit);
member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * System.Drawing.Rectangle * System.Drawing.GraphicsUnit -> unit
Public Sub DrawImage (image As Image, destRect As Rectangle, srcRect As Rectangle, srcUnit As GraphicsUnit)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像的目的地矩形。
建立要從中擷取影像部分的來源矩形。
將來源矩形的測量單位設定為圖元。
將影像繪製到畫面。
目的地矩形的位置會在畫面上找到影像、來源和目的地矩形的大小會決定繪製影像的縮放比例，而來源矩形的大小會決定原始影像的繪製到畫面的哪個部分。
private:
void DrawImageRectRect( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying image.
Rectangle destRect = Rectangle(100,100,450,150);
// Create rectangle for source image.
Rectangle srcRect = Rectangle(50,50,150,150);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw image to screen.
e->Graphics->DrawImage( newImage, destRect, srcRect, units );
private void DrawImageRectRect(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying image.
Rectangle destRect = new Rectangle(100, 100, 450, 150);
// Create rectangle for source image.
Rectangle srcRect = new Rectangle(50, 50, 150, 150);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, destRect, srcRect, units);
Private Sub DrawImageRectRect(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying image.
Dim destRect As New Rectangle(100, 100, 450, 150)
' Create rectangle for source image.
Dim srcRect As New Rectangle(50, 50, 150, 150)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, destRect, srcRect, units)
End Sub
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會縮放為符合 參數所
destRect
指定的矩形。
public:
void DrawImage(System::Drawing::Image ^ image, System::Drawing::RectangleF destRect, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit);
public void DrawImage (System.Drawing.Image image, System.Drawing.RectangleF destRect, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit);
member this.DrawImage : System.Drawing.Image * System.Drawing.RectangleF * System.Drawing.RectangleF * System.Drawing.GraphicsUnit -> unit
Public Sub DrawImage (image As Image, destRect As RectangleF, srcRect As RectangleF, srcUnit As GraphicsUnit)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立要在其中繪製影像的目的地矩形。
建立要從中擷取影像部分的來源矩形。
將來源矩形的測量單位設定為圖元。
將影像繪製到畫面。
目的地矩形的位置會在畫面上找到影像、來源和目的地矩形的大小會決定繪製影像的縮放比例，而來源矩形的大小會決定原始影像的繪製到畫面的哪個部分。
public:
void DrawImageRectFRectF( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create rectangle for displaying image.
RectangleF destRect = RectangleF(100.0F,100.0F,450.0F,150.0F);
// Create rectangle for source image.
RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw image to screen.
e->Graphics->DrawImage( newImage, destRect, srcRect, units );
public void DrawImageRectFRectF(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create rectangle for displaying image.
RectangleF destRect = new RectangleF(100.0F, 100.0F, 450.0F, 150.0F);
// Create rectangle for source image.
RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, destRect, srcRect, units);
Public Sub DrawImageRectFRectF(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create rectangle for displaying image.
Dim destRect As New RectangleF(100.0F, 100.0F, 450.0F, 150.0F)
' Create rectangle for source image.
Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, destRect, srcRect, units)
End Sub
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會縮放為符合 參數所
destRect
指定的矩形。
public:
void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttr);
public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr);
member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] * System.Drawing.Rectangle * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit
Public Sub DrawImage (image As Image, destPoints As Point(), srcRect As Rectangle, srcUnit As GraphicsUnit, imageAttr As ImageAttributes)
下列程式碼範例的設計目的是要與Windows Forms搭配使用，而且需要
PaintEventArgs
e
，這是事件處理常式的參數
Paint
。 此程式碼會執行下列動作：
從範例資料夾中的 JPEG 檔案SampImag.jpg建立映射。
建立點，以定義用來繪製影像的平行投影。
建立矩形以選取要繪製的影像部分。
將圖形繪圖單位設定為圖元。
將原始影像繪製到畫面。
建立額外的平行投影，在其中繪製調整後的影像。
建立並設定調整影像的屬性，以具有大於一般 gamma 值。
將調整後的影像繪製到畫面。
針對原始、未合併的平行投影，位置會在畫面上找到影像，而矩形的大小以及平行投影的大小和形狀，會決定繪製影像的縮放和切割。
private:
void DrawImageParaRectAttrib( PaintEventArgs^ e )
// Create image.
Image^ newImage = Image::FromFile( "SampImag.jpg" );
// Create parallelogram for drawing image.
Point ulCorner1 = Point(100,100);
Point urCorner1 = Point(325,100);
Point llCorner1 = Point(150,250);
array<Point>^ destPara1 = {ulCorner1,urCorner1,llCorner1};
// Create rectangle for source image.
Rectangle srcRect = Rectangle(50,50,150,150);
GraphicsUnit units = GraphicsUnit::Pixel;
// Draw original image to screen.
e->Graphics->DrawImage( newImage, destPara1, srcRect, units );
// Create parallelogram for drawing adjusted image.
Point ulCorner2 = Point(325,100);
Point urCorner2 = Point(550,100);
Point llCorner2 = Point(375,250);
array<Point>^ destPara2 = {ulCorner2,urCorner2,llCorner2};
// Create image attributes and set large gamma.
ImageAttributes^ imageAttr = gcnew ImageAttributes;
imageAttr->SetGamma( 4.0F );
// Draw adjusted image to screen.
e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr );
private void DrawImageParaRectAttrib(PaintEventArgs e)
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing image.
Point ulCorner1 = new Point(100, 100);
Point urCorner1 = new Point(325, 100);
Point llCorner1 = new Point(150, 250);
Point[] destPara1 = {ulCorner1, urCorner1, llCorner1};
// Create rectangle for source image.
Rectangle srcRect = new Rectangle(50, 50, 150, 150);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
// Create parallelogram for drawing adjusted image.
Point ulCorner2 = new Point(325, 100);
Point urCorner2 = new Point(550, 100);
Point llCorner2 = new Point(375, 250);
Point[] destPara2 = {ulCorner2, urCorner2, llCorner2};
// Create image attributes and set large gamma.
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetGamma(4.0F);
// Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, imageAttr);
Private Sub DrawImageParaRectAttrib(ByVal e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing image.
Dim ulCorner1 As New Point(100, 100)
Dim urCorner1 As New Point(325, 100)
Dim llCorner1 As New Point(150, 250)
Dim destPara1 As Point() = {ulCorner1, urCorner1, llCorner1}
' Create rectangle for source image.
Dim srcRect As New Rectangle(50, 50, 150, 150)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units)
' Create parallelogram for drawing adjusted image.
Dim ulCorner2 As New Point(325, 100)
Dim urCorner2 As New Point(550, 100)
Dim llCorner2 As New Point(375, 250)
Dim destPara2 As Point() = {ulCorner2, urCorner2, llCorner2}
' Create image attributes and set large gamma.
Dim imageAttr As New ImageAttributes
imageAttr.SetGamma(4.0F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
imageAttr)
End Sub
參數
destPoints
會指定平行投影的三個點。 這三個
Point
結構代表平行投影的左上角、右上角和左下角。 第四個點是從前三個點推斷，以形成平行投影。
參數
srcRect
會指定要繪製之
image
物件的矩形部分。 這個部分會進行縮放和切割，以符合 參數所
destPoints
指定的平行投影。