Turn a rotated QRect into a QPolygon

Question

I am trying to check collisions between a QPolygon and a QRect by turning the QRect into a QPolygon. However, the rectangle might also have a rotation that I have added, so I am wondering how I would turn that QRect into a QPolygon taking into account the rotation?

Answer 1

I think you can convert QRect into QPolygon using QMatrix::mapToPolygon.

Here is the description: http://doc.qt.io/qt-5/qmatrix.html#mapToPolygon

I believe you will be able to convert your QRect into QPolygon taking the rotation matrix into account.

Edit: Actually QTransform::mapToPolygon can be more suitable in this case. Please try:

http://doc.qt.io/qt-5/qtransform.html#mapToPolygon

as well.