/// <summary>
/// Check if a polygon has a specified winding.
/// </summary>
public static bool HasWinding(
this Polygon2d polygon, Winding winding)
{
var winFun = winding == Winding.CCW ? c_ccwFun : c_cwFun;
var ef = polygon.Edge(0);
var e0 = polygon.Edge(1);
var orientation = winFun(ef, e0);
for (int i = 2; i < polygon.PointCount; i++)
{
var e1 = polygon.Edge(i);
if (winFun(e0, e1) != orientation)
{
return(false);
}
e0 = e1;
}
return(winFun(e0, ef) == orientation);
}
