Yes something like that

Are you trying to create something like a Paint program ?

[quote author="Dheerendra" date="1389809506"]I'm assuming that you have picture in png format. You need to load this in pixmap and set this to label. Is that correct ?

1. Load the your png file to PixMap
2. Set this PixMap to QLabel

Subclassing QLabel and implementing paintEvent will re-draw you label.

[/quote]

I now back up the picture without figures (circles and ellipses) with this code:

@

//---------------------------------------------Class LabelImage
class LabelImage: public QLabel
{
QPixmap mypix; //----------------------------------------------------NEW
public:

LabelImage()
{
  mypix = ("..."); //---------------------NEW
  this->setPixmap(mypix);//---------------------NEW

  this->setMouseTracking(true);
};

void paintEvent (QPaintEvent *event)
{
     QLabel::paintEvent( event );
     QPainter painter(this);
         
          // LINES ANS ELLIPSES TREATMENT LOOPS
                         
                MesureFinished = true;
                mypix.save(".."); //--------------------------------------NEW
}

void mousePressEvent (QMouseEvent * event)
{
    if (MesureFinished == false)
    {
        PixelColumn = event->x();
        PixelRow = event->y();
        this->update();
        QLabel::mousePressEvent( event );
    }
};

};
@

How I can save picture + figures?

QString fileName=CurrentDirPath+"/"+"image.png"; 

QPixmap originalPixmap; 

originalPixmap=QPixmap::grabWidget(label);


if (!fileName.isEmpty())

    originalPixmap.save(fileName, format.toAscii());

1. Load the your png file to PixMap
2. Set this PixMap to QLabel

Subclassing QLabel and implementing paintEvent will re-draw you label.

Then you can save the pixmap and display it in a QWidget inside paintEvent using painter.drawPixmap(). No need to subclass QLabel, just subclass QWidget.

QPixmap monPixmap;

LabelImage* LabelIMG = new LabelImage();

LabelIMG-> setFixedSize(monPixmap.fromImage(Image).size());

}
@