/// <summary>
/// 计算该点和其他两点组成的三角形的顺序
/// </summary>
public PolygonSymbol SetSymbol(PolygonPoint2D last, PolygonPoint2D next)
{
Vector2 ab = this.point - last.point;
Vector2 ac = next.point - last.point;
// Vector2 ab = last.point - this.point;
//Vector2 ac = next.point - this.point;
float v = MathUtils.Cross_2d(ab, ac);
if (v > 0)
{
symbol = PolygonSymbol.Negative;
}
else if (v == 0)
{
symbol = PolygonSymbol.Line;
}
else
{
symbol = PolygonSymbol.Positive;
}
return(symbol);
}
public PolygonPoint2D(PolygonPoint2D point2D)
{
this.point = point2D.point;
this.index = point2D.index;
}
