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參考: Getting MouseMoveEvents in Qt

請加入下列至 mainwindow.h

bool eventFilter(QObject *obj,QEvent *event);//事件偵測(滑鼠)

請加入下列至mainwindow.cpp

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
  QString str;
  QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
  QPoint pt = mouseEvent->pos();

  if (event->type() == QEvent::MouseMove)
  {
       mouseEvent = static_cast<QMouseEvent*>(event);
       str = "MouseMove" + QString::number(pt.x()) +", " + QString::number(pt.y());
       setWindowTitle(str);                            // 顯示座標
  }else if(event->type() == QEvent::MouseButtonPress){
       str = "MouseButtonPress" + QString::number(pt.x()) +", " + QString::number(pt.y());
       setWindowTitle(str);                            // 顯示座標
  }
  return false;
}

並且在mainwindow constructor加入

qApp->installEventFilter(this);

測試mouse move

 ----------------------------------------------------------------------------------------------------------------

以上搞定滑鼠偵測事件(mouse move), 現在才是進入正題抓像素正題

在ImageUtility.h加入下列

QRgb getPixel(cv::Mat3b &src, const unsigned int row,const unsigned int col);   //取得(row,col)的像素值

在ImageUtility.cpp加入下列

//取得彩色影像(row,col)的像素值

QRgb getPixel(cv::Mat3b &src,const unsigned int row,const unsigned int col)

{

     QRgb  pixel;

     const  cv::Vec3b *srcrow = src[row];

     pixel  =  qRgba(srcrow[col][2],srcrow[col][1],srcrow[col][0],255);

     returnpixel;

}

在Basler.h加入下列

QRgb getRGBPixel(const unsigned int row,const unsigned int col);//取得(row,col)的像素值

在Basler.cpp加入下列

//取得(row,col)的像素值

QRgbBasler::getRGBPixel(constunsignedintrow,constunsignedintcol)

{

     QRgb pixel;

     if(_Running)

     {

           pixel = getPixel(_img_rgb,row,col);

           return pixel;

     }else{

           return 0;

     }

}


修改mainwindow.cpp中eventFilter

// 事件偵測
bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    QString str;
    QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
    QPoint pt = mouseEvent->pos();

    if (event->type() == QEvent::MouseMove)
    {
        mouseEvent = static_cast<QMouseEvent*>(event);
        str = "(" + QString::number(pt.x()) +", " + QString::number(pt.y()) + "), 倍率: " + QString::number(scaleFactor);
        unsigned int x, y;
        unsigned int r, g, b;
        x = pt.x()/scaleFactor;
        y = pt.y()/scaleFactor;
        if( ui->actionCloseBaslerCCD->isEnabled() & x>0 & y>0)
            if( basler.getRunningStatus())
            {
                QRgb pixel = basler.getRGBPixel(y, x);
                try{
                   r = qRed(pixel);
                   g = qGreen(pixel);
                   b = qBlue(pixel);
                   str += ", RGB = (" + QString::number(r) + "," +
                                        QString::number(g) + "," +
                                        QString::number(r) + ")";
                }catch(...){}
            }
        setWindowTitle(str);                            // 顯示座標
    }else if(event->type() == QEvent::MouseButtonPress){
        str = "MouseButtonPress" + QString::number(pt.x()) +", " + QString::number(pt.y());
        //setWindowTitle(str);                            // 顯示座標
    }else if(event->type() == QEvent::MouseButtonRelease){
        str = "MouseButtonRelease" + QString::number(pt.x()) +", " + QString::number(pt.y());
        //setWindowTitle(str);                            // 顯示座標
    }
    return false;
}

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