Top "Qpainter" questions

QPainter is a Qt class that provides low-level painting on widgets or other paint devices.

How to use QPainter on QPixmap

I'm a newbie to Qt/Embedded. I want to use QPainter to draw stuff on a QPixmap, which will be …

qt qt4 qgraphicsscene qpainter qpixmap
Qt Beginner QPainter and QRect

How would I go about drawing a rectangle? I have tried two different ways; void MyWidget::paintEvent(QPaintEvent *) { QPainter painter(…

qt qpainter qrect
QPainter. Draw line

I am trying to draw line. int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); …

qt qpainter
Qt drawing a filled rounded rectangle with border

I want to draw a rectangle with rounded corners (border radius same for all 4 corners) with a specific color filling …

c++ qt rectangles rounded-corners qpainter
Qt: QWidget::paintEngine: Should no longer be called

I'm trying to make an app where you can draw with your finger on a canvas. To achieve this, I'm …

c++ qt qpainter
How to make Qt widgets fade in or fade out?

I am trying to fade in and fade out a QLabel or for that matter any QWidget subclass. I have …

qt animation opacity fadeout qpainter
QPainter not active

The following code results in a bunch of errors: void MainWindow::displayBoard() { QPixmap pix(0,0); pix.fill(Qt::white); QPainter painter(&…

c++ qt qpainter
How to draw and fill a triangle with QPainter?

This is what I tried, it gave me no output. Where am I going wrong? // Start point of bottom line …

qt qpainter
How to align QPainter drawText around a point, not a rectangle?

I want to set text drawing alignment using one point as coordinate, not a rectangle. As far as I understand …

qt text-alignment qpainter
QtPainter Error Paint device returned engine ==0, type 3 ,Painter not active

I'm trying to paint some points of my image and I don't know why it doesn't work. I have defined …

c++ qt qpainter