What steps are necessary to enable antialiasing when using a QPainter on a QGLWidget?

Question

I am trying to draw basic shapes on a QGLWidget. I am trying to enable antialiasing to smooth out the lines, but it is not working.

This is what I am trying at the m

Answer 1

This question is quite old but I still found it on Google. You shouldn't use QGLWidget any more. Use the newer QOpenGLWidget. This renders the scene off-screen rather than creating a native OpenGL window which causes all sorts of issues with resizing layouts. This code works for me. Put it in your QGraphicsView constructor:

QOpenGLWidget* gl = new QOpenGLWidget;
QSurfaceFormat fmt;
fmt.setSamples(8);
gl->setFormat(fmt);
setViewport(gl);
setRenderHint(QPainter::Antialiasing);