public static SegmentIntersectionType SegmentIntersection(SegRat1 s, SegRat1 t, ref Rational pointIntersection, ref SegRat1 segmentIntersection)
{
//This check is important for handling degenerate cases like s = [x, x).
if (s.IsEmpty() || t.IsEmpty())
{
return(SegmentIntersectionType.None);
}
s.NormalizeOrientation();
t.NormalizeOrientation();
if (s.A > t.A)
{
MathAid.Swap(ref s, ref t);
}
if (s.B < t.A)
{
return(SegmentIntersectionType.None);
}
if (s.B == t.A)
{
if (s.BClosed && t.AClosed)
{
pointIntersection = s.B;
return(SegmentIntersectionType.Point);
}
else
{
return(SegmentIntersectionType.None);
}
}
Rational b = Rational.Min(s.B, t.B);
segmentIntersection.A = t.A;
segmentIntersection.B = b;
segmentIntersection.AClosed = (t.AClosed && (s.A < t.A || (s.AClosed && s.A == t.A)));
segmentIntersection.BClosed = ((s.BClosed && t.BClosed) || (s.BClosed && b < t.B) || (t.BClosed && b < s.B));
return(SegmentIntersectionType.Segment);
}
//Flip the orientation of this segment
public void Flip()
{
MathAid.Swap(ref A, ref B);
MathAid.Swap(ref AClosed, ref BClosed);
}