Drawing a point over an image on QLabel.

nishu

I displayed a picture on QLabel and wanted to take coordinates and paint a point on image on mouse click event. I am able to get coordinates but painter is painting point below my image on label, i want it above my image.

My code is :

imageviewer.h

@#include <QPushButton>

class imageviewer : public QLabel
{
Q_OBJECT

public:
explicit imageviewer(QWidget *parent = 0);

private slots:

void mousePressEvent(QMouseEvent * e);
void paintEvent(QPaintEvent * e);

private:

QLabel *label1 ;
int mFirstX;
int mFirstY;
bool mFirstClick;
bool mpaintflag;

};

#endif
@

imageviewer.cpp
@

#include <QtGui>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include "imageviewer.h"
#include <QDebug>

imageviewer::imageviewer(QWidget *parent)
: QLabel(parent)
{

label1 = new QLabel;
label1->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
QPixmap pm1("/home/nishu/Pictures/img_0002.jpg");
label1->setPixmap(pm1);
label1->adjustSize();
label1->setScaledContents(true);

QHBoxLayout *hlayout1 = new QHBoxLayout;
hlayout1->addWidget(label1);

setLayout(hlayout1);

}

void imageviewer :: mousePressEvent(QMouseEvent *e)
{
mFirstX=0;
mFirstY=0;
mFirstClick=true;
mpaintflag=false;

if(e->button() == Qt::LeftButton)
        {
            //store 1st point
            if(mFirstClick)
            {
                mFirstX = e->x();
                mFirstY = e->y();
                mFirstClick = false;
                mpaintflag = true;
                qDebug() << "First image's coordinates" << mFirstX << "," << mFirstY ;
                update();

            }
           
        }

}

void imageviewer :: paintEvent(QPaintEvent * e)
{

QLabel::paintEvent(e);

if(mpaintflag)
{
           QPainter painter(this);
           QPen paintpen(Qt::red);
           paintpen.setWidth(10);
           QPoint p1;
           p1.setX(mFirstX);
           p1.setY(mFirstY);
           painter.setPen(paintpen);
           painter.drawPoint(p1);
        }

}
@
main.cpp

@
#include "imageviewer.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
imageviewer w;
w.showMaximized();

return a.exec&#40;&#41;;

}
@