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[liudaisuda <>]

I stored for each vertex in a regular triangulation its dual power cell in
the Polygon_2 structure provided by CGAL. Before I do things with the power
cell polygon, I have to make sure the cell is convex, so I did an assertion
"assert(poly_name.is_convex())". This is where the problem arises. I drew
the polygon, it looked like convex, but the assertion failed. Below are the
picture of the polygon and the segments in it. I wonder if there are certain
issues with the Polygon_2 structure in CGAL. Please help me resolve this
issue.  

The segments which the polygon contains.
<http://cgal-discuss.949826.n4.nabble.com/file/n4657368/1_ZUD4RD26%6015M%5D%60_Y73SGU.jpg>
 

This is what the polygon looks like based on OpenGL rendering facility.
<http://cgal-discuss.949826.n4.nabble.com/file/n4657368/O%40%7ER7IIV%5BOXW9K52AD6_URQ.jpg>
 



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