[PyQt] PyQt4 does not recognize the *shape* of QGraphicsItems for collision detection

[Philippe Crave]

not sure, but maybe you should set this flag: ItemClipsToShape

http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qgraphicsitem.html#GraphicsItemFlag-enum


2010/8/14 Konrad Koller <koko9991 at googlemail.com>
>
> In many games collision detection is important. In my case the game's stones are mostly convex polygons.
> Therefore their bounding rectangle is not adequate for collision detection and therefore I create them
> in the constructor of the class Stone(QGraphicsItem) as QPainterPaths like so:
>
> self.path=QPainterPath()
> self.path.addPolygon(polygon)
> self.path.closeSubpath()
>
> Then their shape is simple:
>
> def shape(self): return self.path
>
> Their boundingRect (used elsewhere) is:
>
> def boundingRect(self): return self.path.boundingRect()
>
> For collision detection with already placed stones I write:
>
> for item in self.collidingItems(Qt.IntersectsItemShape):
>     if isinstance(item,Stone): print "Collision!"
>
> To my surprise the detection does not recognize the shape but obviously the boundingRect.
> For example:
> _________
> |______    |
>   ___    |   |___
>  |     |    |_____|
>  |     |
>  |     |_
>  |____|
>
> This reports a "collision". Why?
>
>  Thanks for any hint. Konrad
>
>
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