DrawLine over QPixmap within Qlabel

[Qt Coder]

Hello all,


I Have one Qlabel in which I m displaying one .PNG image using QPixmap.

Now my program needs to draw few horizontal lines over this image..

How to add it?????

[Lykurg]

Hi, subclass QLabel and reimplemented QWidget::paintEvent ( QPaintEvent * event ). First pas the event to QLabel and then draw your lines using QPainter p(this);

Lykurg

EDIT: you also could modify your picture since QPixmap is a QPaintDevice. QPainter p(*yourPixmap);

[spirit]

or if you don't want to sublcass QLabel you can install event filter on your label and process QPainEvent.

[Qt Coder]

Hey could you please show me some code how to do this stuff??????

[spirit]

try this


QPixmap p;
QPainter painter(&p);
QLineF line(10.0, 80.0, 90.0, 20.0);
painter.drawLine(line);
label->setPixmap(p);

[Lykurg]

QPixmap pix(":/your/fancy/png/here");
QPainter p(&pix);
p->drawLine(pix.rect().topLeft(),pix.rect().bottomRig ht());
//use pix normaly...

[Lykurg]

Ok, I am out. spirit you get me one more time...:crying:

[spirit]

Ok, I am out. spirit you get me one more time...:crying:

sorry :rolleyes:

[Qt Coder]

Hey thanx both of you,

Its working now !!!!!!!!!!