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Hi Yang,

A polygon_2 or PolyonWithHoles_2 outer boundary has to be ordered  
counter-clockwise. However, the boundary for holes of a PWH must be  
ordered clockwise.
When you create the points vectors you violate these conditions.
best,

Guy




Quoting "Yang Qu" 
<>:

> Hi,
>
> I use the attached code to compute difference of a polygon and a  
> polygon with holes,
> I got the code compiled, but when I run it, it gives me the error:  
> the polygon has a wrong orientation
>
> Anyone know why this happened?
>
> Regards,
> Yang
>
>
>
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