public bool TryFindIdenticalPoint(LineSegment2D lineSegment, out Point2D point)
{
if (PointList[0].Equals(lineSegment.PointList[0]) || PointList[0].Equals(lineSegment.PointList[1]))
{
point = PointList[0];
return(true);
}
else if (PointList[1].Equals(lineSegment.PointList[0]) || PointList[1].Equals(lineSegment.PointList[1]))
{
point = PointList[1];
return(true);
}
else
{
point = null;
return(false);
}
}
public Shape2D IntersectingShape(LineSegment2D lineSegment)
{
if (Equals(lineSegment))
{
return(new LineSegment2D(PointList[0].Clone(), PointList[1].Clone()));
}
else if (TryFindIdenticalPoint(lineSegment, out Point2D point))
{
return(point.Clone());
}
else if (IsOnSameLine(lineSegment))
{
return(IntersectingShapeOnLine(lineSegment));
}
else
{
return(IntersectingShapeGenericCase(lineSegment));
}
}
private Shape2D IntersectingShapeGenericCase(LineSegment2D lineSegment)
{
double r0x = PointList[0].X;
double r0y = PointList[0].Y;
double r1x = PointList[1].X - PointList[0].X;
double r1y = PointList[1].Y - PointList[0].Y;
double s0x = lineSegment.PointList[0].X;
double s0y = lineSegment.PointList[0].Y;
double s1x = lineSegment.PointList[1].X - lineSegment.PointList[0].X;
double s1y = lineSegment.PointList[1].Y - lineSegment.PointList[0].Y;
double u = (s1x * (s0y - r0y) - s0x * s1y + r0x * s1y) / (r1y * s1x - r1x * s1y);
double v = (r1x * (s0y - r0y) - s0x * r1y + r0x * r1y) / (r1y * s1x - r1x * s1y);
if (!Utilities.LessThanValue(u, 0) && !Utilities.GreaterThanValue(u, 1) &&
!Utilities.LessThanValue(v, 0) && !Utilities.GreaterThanValue(v, 1))
{
return(new Point2D(r0x + u * r1x, r0y + u * r1y));
}
else
{
return(new EmptyShape2D());
}
}
