c++qtqpainterself-intersectionqpainterpath
find the lines cross while draw free path using QPainterPath
I'm implementing the free-form style drawing for drawing a free path using the mouse press and move with Qpainter QPainterpath
Now i have to detect when exactly the drawn path crossed or intersects with the other. how i can identify when the lines crossed each other at some point and give warning to the user.
Solution
Qt API does not have this capability to tell that if a path composed of different elements intersect in a point or not. You should check it by your self. When the path is finished, compare piece-wise segments of the path using QPainterPath::intersects function. The elements could be accessed via QPainterPath::elementAt(int index).
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