/// <summary>
/// 获取两条线段重合部分
/// </summary>
/// <param name="line1">线段1</param>
/// <param name="line2">线段2</param>
/// <returns>重合部分</returns>
public static Line Coincide(Line line1, Line line2)
{
LineSegment3d l1 = new LineSegment3d(line1.StartPoint, line1.EndPoint);
LineSegment3d l2 = new LineSegment3d(line2.StartPoint, line2.EndPoint);
LinearEntity3d l3 = l1.Overlap(l2);
return(new Line(l3.StartPoint, l3.EndPoint));
}
public static bool isSegmentsProjectionOverlapped(LineSegment3d lineseg1, LineSegment3d lineseg2)
{
Point3d projectPt1 = lineseg1.GetClosestPointTo(lineseg2.StartPoint).Point;
Point3d projectPt2 = lineseg1.GetClosestPointTo(lineseg2.EndPoint).Point;
// after the projection, the two line segments(p1->p2 & p3->p4) may be same
if ((projectPt1.IsEqualTo(lineseg1.StartPoint) && projectPt2.IsEqualTo(lineseg1.EndPoint)) ||
(projectPt1.IsEqualTo(lineseg1.EndPoint) && projectPt2.IsEqualTo(lineseg1.StartPoint)))
{
return(true);
}
// [Daniel] retrun null if no overlap???
LineSegment3d projectSeg2 = new LineSegment3d(projectPt1, projectPt2);
LinearEntity3d overlap = lineseg1.Overlap(projectSeg2);
return(overlap != null);
}