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();
}
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