title: How to get the current angle of a QPolygonF item in a QGraphicsScene item?
body: <p>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.
  <a href="https://i.stack.imgur.com/2d5Br.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2d5Br.png" alt="enter image description here"></a></p>
  
  <p>I do not know the current angle of the <code>QPolygonF item</code> to subtract from the target point angle. How can i make it?
  <a href="https://i.stack.imgur.com/ttsZm.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ttsZm.jpg" alt="enter image description here"></a></p>