/// <summary>
/// 获取相交点，如果没有，则返回null。
/// </summary>
/// <param name="line">线段</param>
/// <returns></returns>
public TCoord GetIntersectPoint(TwoDLineSegment <TCoord> line)
{
TCoord val = default(TCoord);
if (!this.IntersectsWith(line.Box))
{
return(val);
}
TCoord coord = this.Left.GetIntersectionCoord(line);
if (coord != null)
{
return(coord);
}
coord = this.Top.GetIntersectionCoord(line);
if (coord != null)
{
return(coord);
}
coord = this.Right.GetIntersectionCoord(line);
if (coord != null)
{
return(coord);
}
coord = this.Bottom.GetIntersectionCoord(line);
return(coord);
}
private List <TCoord> GetIntersectPoints(TwoDLineSegment <TCoord> line, TCoord outerCoord)
{
List <TCoord> list = new List <TCoord>();
Direction direction = GetDirection(outerCoord);
switch (direction)
{
case Direction.East:
list.Add(this.Right.GetIntersectionCoord(line));
return(list);
case Direction.South:
list.Add(this.Bottom.GetIntersectionCoord(line));
return(list);
case Direction.North:
list.Add(this.Top.GetIntersectionCoord(line));
return(list);
case Direction.West:
list.Add(this.Left.GetIntersectionCoord(line));
return(list);
case Direction.NorthEast:
TCoord coordA = this.Top.GetIntersectionCoord(line);
TCoord coordB = this.Right.GetIntersectionCoord(line);
if (coordA != null)
{
list.Add(coordA);
}
if (coordB != null)
{
list.Add(coordB);
}
return(list);
case Direction.NorthWest:
TCoord coordA1 = this.Top.GetIntersectionCoord(line);
TCoord coordB1 = this.Left.GetIntersectionCoord(line);
if (coordA1 != null)
{
list.Add(coordA1);
}
if (coordB1 != null)
{
list.Add(coordB1);
}
return(list);
case Direction.SouthEast:
TCoord coordA2 = this.Bottom.GetIntersectionCoord(line);
TCoord coordB2 = this.Right.GetIntersectionCoord(line);
if (coordA2 != null)
{
list.Add(coordA2);
}
if (coordB2 != null)
{
list.Add(coordB2);
}
return(list);
case Direction.SouthWest:
TCoord coordA3 = this.Bottom.GetIntersectionCoord(line);
TCoord coordB3 = this.Left.GetIntersectionCoord(line);
if (coordA3 != null)
{
list.Add(coordA3);
}
if (coordB3 != null)
{
list.Add(coordB3);
}
return(list);
default:
return(list);
}
}
/// <summary>
/// 线段与盒子，可能出现1，包含，2，远离，3穿过，4相交一个边
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public List <TCoord> GetIntersectPoints(TwoDLineSegment <TCoord> line)
{
List <TCoord> list = new List <TCoord>();
//1包含
if (this.Contains(line.Box))
{
return(list);
}
//2远离
if (!this.IntersectsWith(line.Box))
{
return(list);
}
// 4相交一个边
if (this.Contains(line.CoordA))//包含A
{
list.Add(line.CoordA);
list.AddRange(GetIntersectPoints(line, line.CoordB));
return(list);
}
if (this.Contains(line.CoordB))//包含A
{
list.Add(line.CoordB);
list.AddRange(GetIntersectPoints(line, line.CoordA));
return(list);
// return GetIntersectPoints(line, line.CoordA);
}
//3穿过，
// TCoord currentVal = default(TCoord);
TCoord coordLeft = this.Left.GetIntersectionCoord(line);
if (coordLeft != null)
{
list.Add(coordLeft);
}
TCoord coordTop = this.Top.GetIntersectionCoord(line);
if (coordTop != null)
{
list.Add(coordTop);
}
TCoord coordRight = this.Right.GetIntersectionCoord(line);
if (coordRight != null)
{
list.Add(coordRight);
}
TCoord coordbottom = this.Bottom.GetIntersectionCoord(line);
if (coordbottom != null)
{
list.Add(coordbottom);
}
return(list);
}
/// <summary>
/// 计算两线段的交点。如果不相交，则返回null。
/// </summary>
/// <param name="other">另一条线段</param>
/// <returns></returns>
public override XY GetIntersectionCoord(TwoDLineSegment <XY> other)
{
return(XyUtil.GetIntersectionPtOfTwoLineSegment(this.CoordA, this.CoordB, other.CoordA, other.CoordB));
}
/// <summary>
/// 计算两线段的交点。如果不相交，则返回null。
/// </summary>
/// <param name="other">另一条线段</param>
/// <returns></returns>
public virtual TCoord GetIntersectionCoord(TwoDLineSegment <TCoord> other)
{
return((TCoord)XyUtil.GetIntersectionPtOfTwoLineSegment(this.CoordA, this.CoordB, other.CoordA, other.CoordB));
// return default(TCoord);
}
