我的程序任务很简单，就是当在一幅图像上单击的时候，实时显示当前鼠标单击点的坐标，并将当前单击点以红十字叉表示，同是再以此单击点为中心，构建一个绿色的矩形框，在功能上我都已经实现了，但现在却发现了一个问题，就是我发现figure的WindowButtonDownFcn与axes的ButtonDownFcn行为迥异，当我重载figure的WindowButtonDownFcn，可以正确的实现我的功能，但当我重载axes的ButtonDownFcn而将figure的WindowButtonDownFcn屏蔽掉的时候，程序却没有任何的反应，我检查了好多遍，都没有查出原因，渴望热心的朋友帮我看看，万分感谢，为了不至于让系统扣大家的M币，我把代码直接贴在下面了。
function varargout = MouseClickDrawFrame(varargin)
% MOUSECLICKDRAWFRAME M-file for MouseClickDrawFrame.fig
% MOUSECLICKDRAWFRAME, by itself, creates a new MOUSECLICKDRAWFRAME or raises the existing
% singleton*.
% H = MOUSECLICKDRAWFRAME returns the handle to a new MOUSECLICKDRAWFRAME or the handle to
% the existing singleton*.
% MOUSECLICKDRAWFRAME('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in MOUSECLICKDRAWFRAME.M with the given input arguments.
% MOUSECLICKDRAWFRAME('Property','Value',...) creates a new MOUSECLICKDRAWFRAME or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before MouseClickDrawFrame_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to MouseClickDrawFrame_OpeningFcn via varargin.
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance to run (singleton)".
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help MouseClickDrawFrame
% Last Modified by GUIDE v2.5 30-Dec-2009 20:32:58
% Author: ilovehust
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @MouseClickDrawFrame_OpeningFcn, ...
'gui_OutputFcn', @MouseClickDrawFrame_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
gui_mainfcn(gui_State, varargin{:});
% End initialization code - DO NOT EDIT
% --- Executes just before MouseClickDrawFrame is made visible.
function MouseClickDrawFrame_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to MouseClickDrawFrame (see VARARGIN)
% Choose default command line output for MouseClickDrawFrame
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes MouseClickDrawFrame wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = MouseClickDrawFrame_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
function edit_rowCoordinate_Callback(hObject, eventdata, handles)
% hObject handle to edit_rowCoordinate (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of edit_rowCoordinate as text
% str2double(get(hObject,'String')) returns contents of edit_rowCoordinate as a double
% --- Executes during object creation, after setting all properties.
function edit_rowCoordinate_CreateFcn(hObject, eventdata, handles)
% hObject handle to edit_rowCoordinate (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
function edit_colCoordinate_Callback(hObject, eventdata, handles)
% hObject handle to edit_colCoordinate (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of edit_colCoordinate as text
% str2double(get(hObject,'String')) returns contents of edit_colCoordinate as a double
% --- Executes during object creation, after setting all properties.
function edit_colCoordinate_CreateFcn(hObject, eventdata, handles)
% hObject handle to edit_colCoordinate (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
% --- Executes on button press in push_InputImage.
function push_InputImage_Callback(hObject, eventdata, handles)
% hObject handle to push_InputImage (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global g_InputImage;
[FileName, PathName, FilterIndex] = uigetfile({'*.bmp;*.jpg;*.gif','(*.bmp;*.jpg;*.gif)';'*.bmp','(*.bmp)';'*.jpg','(*.jpg)';'*.gif','(*.gif)';},'打开图片');
if FilterIndex == 0
return;
g_InputImage = imread(fullfile(PathName, FileName));
axes(handles.axes1);
imshow(g_InputImage, []);
% --- Executes on mouse press over axes background.
function axes1_ButtonDownFcn(hObject, eventdata, handles)
% hObject handle to axes1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% global g_InputImage;
% axes(handles.axes1);
% imshow(g_InputImage, []);
% ClickPoint = get(gca,'currentpoint');
% col_coordinate = ClickPoint(1,1);
% row_coordinate = ClickPoint(1,2);
% CrossImage = DrawCross(g_InputImage, round(col_coordinate), round(row_coordinate), 5, 3, [255, 0, 0]);
% ImageFrame = DrawFrameByCenter(CrossImage, round(col_coordinate), round(row_coordinate), 50, 25, 3, [0, 255, 0]);
% axes(handles.axes1);
% imshow(CrossImage, []);
% set(handles.edit_rowCoordinate, 'String', num2str(round(row_coordinate)));
% set(handles.edit_colCoordinate, 'String', num2str(round(col_coordinate)));
% --- Executes on mouse press over figure background, over a disabled or
% --- inactive control, or over an axes background.
function figure1_WindowButtonDownFcn(hObject, eventdata, handles)
% 说明：当将figure1_WindowButtonDownFcn中的代码全部屏蔽掉而将axes1_ButtonDownFcn中的代码全部打开的时候，单击没有任何的反应。
% hObject handle to figure1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global g_InputImage;
ClickPoint = get(gca,'currentpoint');
col_coordinate = ClickPoint(1,1);
row_coordinate = ClickPoint(1,2);
CrossImage = DrawCross(g_InputImage, round(col_coordinate), round(row_coordinate), 5, 3, [255, 0, 0]);
ImageFrame = DrawFrameByCenter(CrossImage, round(col_coordinate), round(row_coordinate), 50, 25, 3, [0, 255, 0]);
axes(handles.axes1);
imshow(ImageFrame, []);
set(handles.edit_rowCoordinate, 'String', num2str(round(row_coordinate)));
set(handles.edit_colCoordinate, 'String', num2str(round(col_coordinate)));
1、figure的windowbuttondown函数是当鼠标在figure中点击时（无论是左键还是右键），程序调用的回调函数。这时，程序不管鼠标是在那一个控件的区域内，只要点击，都调用该函数；
2、axes或其它控件的ButtonDownFcn函数是当控件位于
该控件
的区域内时，点击时所调用的函数。matlab如何区分控件呢？是通过控件的句柄--handle来区别的。
初次建立axes控件时，系统获得一个句柄，这个句柄是和该axes是对应的；当显示了图片以后，原先的axes改变了（包括axes轴的x、y轴的范围，比例等），再点击axes轴，这时是点击的图片，并不是原先的axes了，所以ButtonDownFcn当然不会被调用了，但windowbuttondown照样被调用。
3、解决的办法是：在用imshow或其它函数显示完图像时，用h=imshow等取得显示的图像的句柄，定义图像对象的ButtonDownFcn回调函数为自己定义的函数。
OpeningFcn
函数中加入如下代码：
axes(handles.axes1);
Image=imread('C:\Users\liuhuanjin\Pictures\5HPQ1IFA00AN0001.jpg'); %
hImage=image(Image); %
显示图像，同时取得图像的句柄（
handle
set(hImage,'ButtonDownFcn',@myCallback); %
设置图像对象的
ButtonDown
回调函数为自己定义的
myCallback
handles.hImage=hImage;%
保存图像的句柄到
handles
结构，以备后用
guidata(hObject,handles);
）在自己定义的
myCallback
函数中加入代码：
function myCallback(hObject, eventdata, handles) %
callback
........%
在此加入你的代码
