qcustomplot 绘制 频谱图 瀑布图,游标实现跟随曲线数据的实时展示

文件结构

python的PlotWidget库绘制频谱图 python频谱瀑布图_Qt


pri文件结构

重写qcustomplot
 #ifndef SPECTRUMDISPLAY_H
 #define SPECTRUMDISPLAY_H
#include 
 #include 
 #include<qpainter.h>
 #include
 #include<qcustomplot/qcustomplot.h>
 #include
 #include
 class SpectrumDisplay : public QCustomPlot
 Q_OBJECT
 public:
 explicit SpectrumDisplay(QWidget *parent = nullptr);
 //QCustomPlot *customplot;
 QCPItemText *textLabel;
 QCPItemTracer *tracer_h;
 QCPItemText *textLabel2;
 QCPItemRect *rect;//目标迹点矩形追踪
 QQueue<QVector> appitlude_fre;
 enum direction //创建垂直和水平迹线
 vertical = 1 ,
 horiental = 2,
 QPointF pos;
 QPointF pos2;
 void setXaxisx(double xmin,double xmax);//设置X轴范围
 void setYaxisy(double ymin,double ymax);//设置y轴范围
 void drawCurse(direction);//设置游标
 void setPlotStyle();
 void setdata(QVector freq,QVectorappitude,QColor color);
 void TargetTraceRectangleTracking(QVector,QVector);
 void drawDataEnvelop(QVector freq,QVectorappitude,QColor color);
 void EnableBackgroundZoom(bool);//启用自由缩放
 void EnableOpengl(bool);
 virtual void paintEvent(QPaintEvent *);
 virtual void mouseMoveEvent(QMouseEvent *event);
 signals:public slots:
 };#endif // SPECTRUMDISPLAY_H
 void SpectrumDisplay:: drawCurse(direction dir)//设置游标
 if(dir == vertical )
 /绘制游标直线**********/
 QCPItemStraightLine line= new QCPItemStraightLine (this);
 QPen linesPen(Qt::green, 1, Qt::DashLine);
 line->setPen(linesPen);
 line->setClipToAxisRect(true);
 line->point1->setCoords(0,0);
 line->point2->setCoords(0,0);
 line->setVisible(false);
 /绘制游标箭头**********/
 QCPItemLine arrow = new QCPItemLine(this);
 arrow->start->setParentAnchor(line->point1);
 arrow->end->setCoords(0, 0); //设置直线终点为坐标系中的点
 arrow->setHead(QCPLineEnding::esSpikeArrow);//设置箭头类型(三角形、菱形、方形等)
 arrow->setPen(linesPen);
 arrow->setVisible(false);
 QCPItemLine arrow2 = new QCPItemLine(this);
 arrow2->start->setParentAnchor(line->point2);
 arrow2->end->setCoords(0, 0); //设置直线终点为坐标系中的点
 arrow2->setHead(QCPLineEnding::esSpikeArrow);//设置箭头类型(三角形、菱形、方形等)
 arrow2->setPen(linesPen);
 arrow2->setVisible(false);
 /绘制游标文本******/
 textLabel = new QCPItemText(this);//在QCustomplot中新建文字框
 textLabel->setPositionAlignment(Qt::AlignTop|Qt::AlignLeft);//文字布局:顶、左对齐
 textLabel->position->setType(QCPItemPosition::ptAxisRectRatio);//位置类型(当前轴范围的比例为单位/实际坐标为单位)
 textLabel->position->setCoords(0.1, 0.1); //把文字框放在X轴的中间,Y轴的最顶部
 textLabel->setText(“Text Item Demo”);
 textLabel->setColor(QColor(42,148,235));
 textLabel->setFont(QFont(font().family(), 8)); //字体大小
 textLabel->setPen(QPen(QColor(42,148,235))); //字体颜色
 textLabel->setPadding(QMargins(2,2,2,2));//文字距离边框几个像素
 textLabel->setVisible(false);
 /**绘制数据吸附点/
 tracer_h = new QCPItemTracer(this);
 tracer_h->setGraph(this->graph(0));
 tracer_h->setPen(QPen(Qt::green));
 tracer_h->setStyle(QCPItemTracer::tsCircle);
 connect(this, &QCustomPlot::mouseMove,this,[=](QMouseEvent *event)
 double x = this->xAxis->pixelToCoord(event->pos().x());
 double y = this->yAxis->pixelToCoord(event->pos().y());
 pos= QPointF(x,y);
 if(event->buttons() == Qt::LeftButton)
 tracer_h->setGraphKey(x);
 tracer_h->updatePosition();
 line->point1->setCoords(x,this->yAxis->range().lower);
 line->point2->setCoords(x,this->yAxis->range().upper);
 line->setVisible(true);
 arrow->start->setParentAnchor(line->point1);
 arrow->end->setCoords(x,this->yAxis->range().upper);
 arrow->setVisible(true);
 arrow2->start->setParentAnchor(line->point2);
 arrow2->end->setCoords(x,this->yAxis->range().lower);
 arrow2->setVisible(true);
 textLabel->position->setCoords(x/this->xAxis->range().upper,0.1);
 textLabel->setVisible(true);
 this->replot();
if(dir == horiental)
    QCPItemStraightLine *line = new  QCPItemStraightLine (this);
    QPen linesPen(Qt::red, 1, Qt::DashLine);
    line->setPen(linesPen);
    line->setClipToAxisRect(true);
    line->point1->setCoords(0,0);
    line->point2->setCoords(0,0);
    line->setVisible(false);
    QCPItemLine *arrow = new QCPItemLine(this);
    arrow->start->setParentAnchor(line->point1);  //设置该直线的起点为文字框的下锚点
    arrow->end->setCoords(0, 0); //设置直线终点为坐标系中的点
    arrow->setHead(QCPLineEnding::esSpikeArrow);//设置箭头类型(三角形、菱形、方形等)
    arrow->setPen(linesPen);
    arrow->setVisible(false);
    QCPItemLine *arrow2 = new QCPItemLine(this);
    arrow2->start->setParentAnchor(line->point2);  //设置该直线的起点为文字框的下锚点
    arrow2->end->setCoords(0, 0); //设置直线终点为坐标系中的点
    arrow2->setHead(QCPLineEnding::esSpikeArrow);//设置箭头类型(三角形、菱形、方形等)
    arrow2->setPen(linesPen);
    arrow2->setVisible(false);
    textLabel2 = new QCPItemText(this);//在QCustomplot中新建文字框
    textLabel2->setPositionAlignment(Qt::AlignTop|Qt::AlignLeft);//文字布局:顶、左对齐
    textLabel2->position->setType(QCPItemPosition::ptAxisRectRatio);//位置类型(当前轴范围的比例为单位/实际坐标为单位)
    textLabel2->position->setCoords(0.1, 0.1); //把文字框放在X轴的中间,Y轴的最顶部
    textLabel2->setText("Text Item Demo");
    textLabel2->setFont(QFont(font().family(), 8)); //字体大小
    textLabel2->setPen(QPen(QColor(42,148,235))); //字体颜色
    textLabel2->setColor(QColor(42,148,235));
    textLabel2->setPadding(QMargins(2,2,2,2));//文字距离边框几个像素
    textLabel2->setVisible(false);
    QCPItemTracer *tracer_h = new QCPItemTracer(this);
    tracer_h->setGraph(this->graph(0));
    tracer_h->setPen(QPen(Qt::red));
    tracer_h->setStyle(QCPItemTracer::tsCircle);
    connect(this, &QCustomPlot::mouseMove,this,[=](QMouseEvent *event)
        if(event->buttons() == Qt::RightButton)
            double x = this->xAxis->pixelToCoord(event->pos().x());
            double y = this->yAxis->pixelToCoord(event->pos().y());
            pos2= QPointF(x,y);
            tracer_h->setGraphKey(x);
            tracer_h->updatePosition();
            line->point1->setCoords(this->xAxis->range().lower,y);
            line->point2->setCoords(this->xAxis->range().upper,y);
            line->setVisible(true);
            arrow->start->setParentAnchor(line->point1);  //设置该直线的起点为文字框的下锚点
            arrow->end->setCoords(this->xAxis->range().upper,y); //设置直线终点为坐标系中的点
            arrow->setVisible(true);
            arrow2->start->setParentAnchor(line->point2);  //设置该直线的起点为文字框的下锚点
            arrow2->end->setCoords(this->xAxis->range().lower,y); //设置直线终点为坐标系中的点
            arrow2->setVisible(true);
            textLabel2->position->setCoords(0.1,(1-y/this->yAxis->range().upper));
            textLabel2->setVisible(true);
            this->replot();
 paintevent重载实现实时显示跟随的点
 void SpectrumDisplay:: paintEvent(QPaintEvent *ev)
 QCustomPlot::paintEvent(ev);
 if(textLabel!=nullptr)
 textLabel->setText(“MHZ:”+QString::number(pos.x())+";dB:"+QString::number(tracer_h->position->value()));
 if(textLabel2!=nullptr)
 textLabel2->setText(“MHZ:”+QString::number(pos2.x())+";dB:"+QString::number(tracer_h->position->value()));//    QPainter pen(this);
//    pen.setRenderHint(QPainter::Antialiasing, true);
//    pen.setPen(Qt::yellow);
//    QRect a;
//    double w= this->width();
//    double h = this->height();
//    pen.drawRect(1,1,w/2,h/2);}
 /**• @brief SpectrumDisplay::TargetTraceRectangleTracking
• @param data 绘制矩形追踪标识
• @param sentce
 void SpectrumDisplay:: TargetTraceRectangleTracking(QVector data,QVectorsentce)
 for(int i =0;i<=sentce.count()-1;i++)
 rect = new QCPItemRect(this);
 rect->topLeft->setCoords(data[sentce[i].x()].x(),data[sentce[i].y()].y()+30);
 rect->bottomRight->setCoords(data[sentce[i].y()].x(), data[sentce[i].y()].y()-20);
 rect->setPen(QPen(QColor(0,161,214)));
 void SpectrumDisplay:: drawDataEnvelop(QVector freq,QVectorappitude,QColor color)
 appitlude_fre<<appitude;
 static int z =0;
 if(z>200)
 appitlude_fre.clear();
 QVector maxapplitude(freq.length());
 for(int i = 0;i<appitude.length();i++)
 if(appitlude_fre.length()<2)
 /增加一条曲线绘制包络**********/
 }else
 for(int j = 0;j<appitude.length();j++)
 if(appitude[j]<appitlude_fre[0][j])
 appitude[j] = appitlude_fre[0][j];}else {
        appitlude_fre.dequeue();
this->addGraph();
this->graph(1);
this->graph(1)->setData(freq,appitude);
this->graph(1)->setPen(QPen( color));}
 void SpectrumDisplay:: mouseMoveEvent(QMouseEvent *event)
 QCustomPlot::mouseMoveEvent(event);}
 绘制瀑布图
 void wallplot:: SetWaterFallParm(double xmin,double xmax,double dBmin,double dBmax)
 {//this->setInteractions(QCP::iRangeDrag|QCP::iRangeZoom| QCP::iSelectPlottables);//可拖拽+可滚轮缩放
//每条曲线都会独占一个graph()
//通过传递的轴的QCustomPlot进行注册,简洁理解QCPColorMap的数据为(x轴,y轴;颜色,值value)
m_pColorMap = new QCPColorMap(this->xAxis,this->yAxis);
m_pColorMap->data()->setSize(1000,3000);//设置整个图(x,y)点数,X轴50个点,y轴4096个点
this->xAxis->setRange(xmin,xmax);//当前X轴显示范围
this->yAxis->setRange(-150,20);//当前y轴显示范围
m_pColorMap->data()->setRange(QCPRange(xmin,xmax),QCPRange(dBmin,dBmax));//setRange是设置X轴以及Y轴的范围
m_pColorMap->setGradient(QCPColorGradient::gpCold);//设置默认渐进色变化(可在QCPColorGradient中查看)
m_pColorMap->rescaleDataRange(true);}
 void wallplot:: setData(QVectordatax,QVectordatay)
 static QList<QVector> data;
 data<<datay;
 if(data.length()>4)
 data.removeLast();
 this->addGraph();
 this->graph(0)->setPen(QPen(Qt::gray));//曲线颜色this->graph(0)->setBrush(QBrush(QColor(0,255,255,20)));//曲线与X轴包围区的颜色
//自动调整XY轴的范围,以便显示出graph(0)中所有的点
//给第一个graph设置rescaleAxes(),后续所有graph都设置rescaleAxes(true)即可实现显示所有曲线
this->graph(0)->rescaleAxes();
for(int x=0;x<datax.length();x++)
    for(int j=0;j<data.length();j++)
        for(int y=0;y<data[j].length();y++)
            m_pColorMap->data()->setCell(x,y*j+y,data[j][y]);
this->replot();}

python的PlotWidget库绘制频谱图 python频谱瀑布图_锚点_02


这里就没加测试数据了,需要完整demo的可以私信我。


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