/// <summary>
/// 判断点是否在线段上
/// </summary>
/// <param name="point"></param>
/// <returns></returns>
public override bool PointIsOnCurveSegment(Point3D point)
{
PointLineRelationShipType type = GetPointRelationShip(point);
if (type == PointLineRelationShipType.Point_On_Line)
{
return(true);
}
return(false);
}
/// <summary>
/// 判断传入的射线和当前线段位置关系（当前线段在射线的左、右...）
/// </summary>
/// <param name="line">传入的射线</param>
/// <returns></returns>
public override LineCurveRelationShipType GetCurveCurveRelationShipType(LineSegment line)
{
var dirStart = line.GetTurnDirection(this.GetStartPoint());
var dirEnd = line.GetTurnDirection(this.GetEndPoint());
if (dirStart == TurnDirectionType.Stright && dirEnd == TurnDirectionType.Stright)
{
return(LineCurveRelationShipType.Coincide);
}
else if (dirStart == TurnDirectionType.Left && dirEnd == TurnDirectionType.Right ||
dirStart == TurnDirectionType.Right && dirEnd == TurnDirectionType.Left)
{
Point3D p = line.GetIntersect(this.BeginPoint, this.EndPoint);
PointLineRelationShipType t = line.GetPointRelationShip(p);
if (line != null && t == PointLineRelationShipType.Point_On_Line || t == PointLineRelationShipType.Point_On_Line_EndDir)
{
return(LineCurveRelationShipType.Intersect);
}
else
{
return(LineCurveRelationShipType.Others);
}
}
else if (dirStart == TurnDirectionType.Left && dirEnd == TurnDirectionType.Left)
{
return(LineCurveRelationShipType.Left);
}
else if (dirStart == TurnDirectionType.Right && dirEnd == TurnDirectionType.Right)
{
return(LineCurveRelationShipType.Right);
}
else if (dirStart == TurnDirectionType.Stright && dirEnd == TurnDirectionType.Left ||
dirStart == TurnDirectionType.Left && dirEnd == TurnDirectionType.Stright)
{
return(LineCurveRelationShipType.On_Left);
}
else if (dirStart == TurnDirectionType.Stright && dirEnd == TurnDirectionType.Right ||
dirStart == TurnDirectionType.Right && dirEnd == TurnDirectionType.Stright)
{
return(LineCurveRelationShipType.On_Right);
}
return(LineCurveRelationShipType.Others);
}
/// <summary>
/// 根据直线段上的一点把线段截为两个子线段
/// </summary>
/// <param name="point">直线上用于截取的点</param>
/// <returns>截取后的子线段，点不在直线上返回原始线段</returns>
public override List <CurveSegment> CuteOutbyPoint(Point3D point)
{
PointLineRelationShipType relationShipType = this.GetPointRelationShip(point);
if (relationShipType == PointLineRelationShipType.Point_On_Line)
{
List <CurveSegment> list = new List <CurveSegment>();
list.Add(new LineSegment(this.BeginPoint, point));
list.Add(new LineSegment(point, this.EndPoint));
return(list);
}
else
{
return(new List <CurveSegment>()
{
this
});
}
}
