public void LineIntersectsLine()
{
Vector2f[] line0 = new Vector2f[]
{
new Vector2f(0, 0),
new Vector2f(1, 0),
new Vector2f(2, 0),
new Vector2f(3, 0)
};
Vector2f[] line1 = new Vector2f[]
{
new Vector2f(1, 1),
new Vector2f(1, 0),
new Vector2f(1, -1)
};
var result = LineIntersections2f.LineIntersectsLine(line0, line1);
Assert.IsTrue(result.Hit);
Assert.AreEqual(0, result.A0);
Assert.AreEqual(1, result.B0);
Assert.AreEqual(1.0f, result.T0);
Assert.AreEqual(1.0f, result.T1);
}
public void LineIntersectsRay()
{
Vector2f[] line = new Vector2f[]
{
new Vector2f(0, 0),
new Vector2f(1, 0),
new Vector2f(2, 0),
new Vector2f(3, 0)
};
Vector2f p = new Vector2f(0, -1);
Vector2f n = new Vector2f(0, 1);
//intersects start
var result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsTrue(result.Hit);
Assert.AreEqual(0, result.A);
Assert.AreEqual(1, result.B);
Assert.AreEqual(0.0f, result.T);
p = new Vector2f(3, -1);
n = new Vector2f(0, 1);
//intersects end
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsTrue(result.Hit);
Assert.AreEqual(2, result.A);
Assert.AreEqual(3, result.B);
Assert.AreEqual(1.0f, result.T);
p = new Vector2f(0, 0);
n = new Vector2f(0, 1);
//intersects ray origin
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsTrue(result.Hit);
Assert.AreEqual(0, result.A);
Assert.AreEqual(1, result.B);
Assert.AreEqual(0.0f, result.T);
p = new Vector2f(1, -1);
n = new Vector2f(0, 1);
//intersects join
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsTrue(result.Hit);
Assert.AreEqual(0, result.A);
Assert.AreEqual(1, result.B);
Assert.AreEqual(1.0f, result.T);
p = new Vector2f(1.5f, -1);
n = new Vector2f(0, 1);
//intersects mid
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsTrue(result.Hit);
Assert.AreEqual(1, result.A);
Assert.AreEqual(2, result.B);
Assert.AreEqual(0.5f, result.T);
p = new Vector2f(0, 0);
n = new Vector2f(0, 0);
//degenerate
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsFalse(result.Hit);
p = new Vector2f(0, 0);
n = new Vector2f(1, 0);
//parallel
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsFalse(result.Hit);
p = new Vector2f(3, 0);
n = new Vector2f(-1, 0);
//parallel
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsFalse(result.Hit);
p = new Vector2f(0, 0);
n = new Vector2f(-1, 0);
//parallel
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsFalse(result.Hit);
p = new Vector2f(0, 1);
n = new Vector2f(1, 0);
//no intersection
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsFalse(result.Hit);
p = new Vector2f(-1, -1);
n = new Vector2f(0, 1);
//no intersection
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsFalse(result.Hit);
p = new Vector2f(4, 1);
n = new Vector2f(0, -1);
//no intersection
result = LineIntersections2f.LineIntersectsRay(line, p, n);
Assert.IsFalse(result.Hit);
}
public void LineIntersectsSegment()
{
Vector2f[] line = new Vector2f[]
{
new Vector2f(0, 0),
new Vector2f(1, 0),
new Vector2f(2, 0),
new Vector2f(3, 0)
};
Segment2f seg;
LineResult2f result;
seg.A = new Vector2f(0, 1);
seg.B = new Vector2f(0, -1);
//intersects start
result = LineIntersections2f.LineIntersectsSegment(line, seg);
Assert.IsTrue(result.Hit);
Assert.AreEqual(0, result.A0);
Assert.AreEqual(1, result.B0);
Assert.AreEqual(0.0f, result.T0);
Assert.AreEqual(0.5f, result.T1);
seg.A = new Vector2f(1, 1);
seg.B = new Vector2f(1, -1);
//intersects join
result = LineIntersections2f.LineIntersectsSegment(line, seg);
Assert.IsTrue(result.Hit);
Assert.AreEqual(0, result.A0);
Assert.AreEqual(1, result.B0);
Assert.AreEqual(1.0f, result.T0);
Assert.AreEqual(0.5f, result.T1);
seg.A = new Vector2f(2.5f, 3);
seg.B = new Vector2f(2.5f, -1);
//intersects mid
result = LineIntersections2f.LineIntersectsSegment(line, seg);
Assert.IsTrue(result.Hit);
Assert.AreEqual(2, result.A0);
Assert.AreEqual(3, result.B0);
Assert.AreEqual(0.5f, result.T0);
Assert.AreEqual(0.75f, result.T1);
seg.A = new Vector2f(0, 1);
seg.B = new Vector2f(4, 1);
//parallel
result = LineIntersections2f.LineIntersectsSegment(line, seg);
Assert.IsFalse(result.Hit);
seg.A = new Vector2f(-1, 1);
seg.B = new Vector2f(-1, -1);
//no intersection
result = LineIntersections2f.LineIntersectsSegment(line, seg);
Assert.IsFalse(result.Hit);
seg.A = new Vector2f(4, 1);
seg.B = new Vector2f(4, -1);
//no intersection
result = LineIntersections2f.LineIntersectsSegment(line, seg);
Assert.IsFalse(result.Hit);
}