how to draw a rectangle on an image label without overloading paintEvent function

[tbscope]

Something in the lines of:

QPixmap myPixmap(100, 100); // size
QPainter painter(&myPixmap);
 
// Use the painter to draw things
 
// Then use the pixmap like:
myLabel->setPixmap(myPixmap);

QPixmap myPixmap(100, 100); // size
QPainter painter(&myPixmap);

// Use the painter to draw things

// Then use the pixmap like:
myLabel->setPixmap(myPixmap);

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