public void Property_Segment2DIntersectionShouldBehaveTheSameAsSegment3DIntersection
(
Segment2D segment1,
Segment2D segment2
)
{
var intersection2D = segment1.IntersectWithSegment(segment2);
var intersection3D = segment1.To3D().IntersectWithSegment(segment2.To3D());
if (intersection2D.Is <Null>())
{
intersection3D.Is <Null>().Should().BeTrue();
}
if (intersection2D.Is <Point2D>(out var point2D))
{
intersection3D.Is <Point>().Should().BeTrue();
intersection3D.As <Point>().ToPoint2D().Should().Be(point2D);
}
if (intersection2D.Is <Segment2D>())
{
var segment2D = intersection2D.As <Segment2D>();
intersection3D.Is <LineSegment>().Should().BeTrue();
intersection3D.As <LineSegment>().ProjectTo2D().Should().Be(segment2D);
}
}
public void Property_IntersectWithSegment_ShouldBeSymmetric
(
Segment2D segment1,
Segment2D segment2
)
{
segment1.IntersectWithSegment(segment2).Should().Be(segment2.IntersectWithSegment(segment1));
}
public void IntersectWithSegment2D_OffsetOverlapCloseToTolerance()
{
var edge1 = new Segment2D(Inches, -4.77, 3.08, -2.95934488486086, -0.80296242508802385);
var edge2 = new Segment2D(Inches, -2.998, -0.789, -1.5571358638827124, -3.8789431114303676);
var intersection = edge1.IntersectWithSegment(edge2);
intersection.CastTo <Point2D>().Should().Be(new Point2D(Inches, -2.98, -0.80));
}
public void IntersectWithSegment2D_SlightlyOffsetShortOverlapWithoutEqualEndpoints()
{
var edge1 = new Segment2D(Inches, 0, 0, 1.0312, 0);
var edge2 = new Segment2D(Inches, 1, 0.002, 2, 0.002);
var intersection = edge1.IntersectWithSegment(edge2);
intersection.CastTo <Point2D>().Should().Be(new Point2D(Inches, 1.02, 0));
// I do not think this should change.
intersection.Is <Null>().Should().BeFalse();
}
public void IntersectWithSegment2D_SharedEndPoints_CloseToTolerance()
{
var edge1 = new Segment2D(new Point2D(Unit.Inches,
247.5672, 78.58992105222),
new Point2D(Unit.Inches,
116.954391, 24.1687020923795));
var edge2 =
new Segment2D(new Point2D(Unit.Inches,
266.817596, 70.540802),
new Point2D(Unit.Inches,
247.5672, 78.5615942974942));
var intersection = edge1.IntersectWithSegment(edge2).CastTo <Point2D>();
intersection.Should().Be(edge1.BasePoint);
intersection.Should().Be(edge2.EndPoint);
}
public void Property_IfSegmentsAreParallelAndIntersect_ItShouldBeAnEndPoint
(
Segment2D segment1,
Segment2D segment2
)
{
var intersection = segment1.IntersectWithSegment(segment2);
if (
segment1.GetDirection().IsParallelTo(segment2.GetDirection()) &&
intersection.Is <Point2D>(out var point2D))
{
var point = point2D.ToPoint3D();
var isEndOfOneOf = point.IsBaseOrEndPointOf(segment1.To3D()) ||
point.IsBaseOrEndPointOf(segment2.To3D());
isEndOfOneOf.Should().BeTrue();
}
}
public void Property_NonNullResultIfAnyEndPointIsWithinDistanceToleranceOfOtherSegment
(
Segment2D segment1,
Segment2D segment2
)
{
var intersection = segment1.IntersectWithSegment(segment2);
var ends = Enumerable
.Concat
(
segment1.EndPoints.Where(e => e.ToPoint3D().DistanceTo(segment2.To3D()) == ZeroDistance),
segment2.EndPoints.Where(e => e.ToPoint3D().DistanceTo(segment1.To3D()) == ZeroDistance)
)
.ToList();
if (ends.Any())
{
intersection.Should().NotBe(Null.Instance);
}
}
