/// <summary>
/// 计算时钟方向
/// </summary>
/// <param name="line"></param>
/// <param name="paths"></param>
/// <returns></returns>
protected bool CaclCounterclockwiseDir(LineSegment2D line, List <Double2> paths)
{
if (paths == null || paths.Count == 0)
{
return(true);
}
Double2 f = Double2.zero;
for (int i = 0; i < paths.Count; i++)
{
f += paths[i];
}
f /= paths.Count;
double sinAngle = Double2.SinAngle(line.normalizedDir, f - line.startPoint);
if (sinAngle < 0)
{
return(false);
}
else
{
return(true);
}
}
