public void TestAngledImpacts()
{
// Try all four rotations around the origin
foreach(int xSign in new []{-1, 1})
{
foreach (int ySign in new[] { -1, 1 })
{
GeometryCollection geometry = new GeometryCollection();
Line line = new Line(new Vector2(0, 0), new Vector2(xSign, ySign));
geometry.Add(line);
// position just 0.5 above the line
Particle p = new Particle(new Vector2(0.5f * xSign, (ySign + 1) / 2), new Vector2(0, -1), new Vector2(0, -0.1f));
BoundParticle impact = geometry.FirstCollision(p);
Assert.AreEqual<Line>(line, impact.boundTo);
AssertExtra.AreApproximate(0.5, impact.g);
AssertExtra.AreApproximate(-ySign * 0.5, impact.gv);
AssertExtra.AreApproximate(-ySign * 0.5 / 10, impact.ga);
}
}
}