/// <summary>
/// 求两线段的交点
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public Vector2 IntersectPoint(LineSegment2D line)
{
Vector2 seg = line.Direction;
var h1 = Utility2D.GetTriangleArea(Src, Dest, line.Src) / seg.magnitude;
var h2 = Utility2D.GetTriangleArea(Src, Dest, line.Dest) / seg.magnitude;
var k = h1 / (h1 + h2);
return(this.Direction * k);
}
/// <summary>
/// 点是否在线上
/// </summary>
/// <param name="point"></param>
/// <returns></returns>
public bool Contains(Vector2 point)
{
if (Src == point || Dest == point)
{
return(true);
}
if (!MathUtility.IsInRange(point, Src, Dest))
{
return(false);
}
return(Utility2D.IsSameDirection(Direction, point - Src));
}
/// <summary>
/// 是否相交
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public bool Intersect(LineSegment2D line)
{
int statusSrc = Utility2D.GetPointPosition(line.Src, Src, Dest);
int statusDest = Utility2D.GetPointPosition(line.Dest, Src, Dest);
if (statusSrc == 0 || statusDest == 0)
{
if (statusSrc == 0)
{
return(this.Contains(line.Src));
}
if (statusDest == 0)
{
return(this.Contains(line.Dest));
}
return(false);
}
return(statusSrc != statusDest);
}
/// <summary>
/// 是否平行
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public bool IsParallel(LineSegment2D line)
{
return(Utility2D.IsParallel(Direction, line.Direction));
}
/// <summary>
/// 是否包含点
/// </summary>
/// <param name="point"></param>
/// <returns></returns>
public bool Contains(Vector2 point)
{
int ret = Utility2D.GetPointPosition(point, Points);
return(ret <= 0);
}