如何获取QGraphicsScene项目中QPolygonF项目的当前角度？

Question

I'm want to implement seek behavior with an itme rotation towards the direction point. All manipulations I'm making in QGraphicsView with QGraphicsScene and a QPolygonF item.

I do not know the current angle of the QPolygonF item to subtract from the target point angle. How can i make it?

Answer 1

You can use a QGraphicsPolygonItem and rotate that towards the target. (To determine the angle, take the item.pos() - point.pos() and calculate it's arctangent).

You should really not bother with rotating the painter as you do in the other question your refer to, but with rotating the Vehicle , which should be a QGraphicsSceneItem . The GraphicsScene takes care of the transformations.

Next to that, probably the rotation angle should be the atan(...) *360/twopi .