public void AssertThat_DistanceToPoint_AlwaysEqualsDistanceToClosestPoint()
{
Random r = new Random(1);
for (int i = 0; i < 1000; i++)
{
var start = new Vector2((float)r.NextDouble(), (float)r.NextDouble());
var end = new Vector2((float)r.NextDouble(), (float)r.NextDouble());
var point = new Vector2((float)r.NextDouble(), (float)r.NextDouble());
var ry = new Ray2(start, end - start);
//Check that naieve distance to closest point (literally Distance(CalculateClosestPoint() - Point)
//is the same as the more refined calculation
Assert.AreEqual((ry.ClosestPoint(point) - point).Length(), Math.Abs(ry.DistanceToPoint(point)), 0.001f);
}
}
public void AssertThat_DistanceToPoint_IsSignedDistance_Negative()
{
var r = new Ray2(new Vector2(1, 1), new Vector2(20, 0));
Assert.AreEqual(-9, r.DistanceToPoint(new Vector2(0, -8)));
}
public void AssertThat_DistanceToPoint_IsSignedDistance_Positive()
{
Ray2 r = new Ray2(new Vector2(1, 1), new Vector2(10, 0));
Assert.AreEqual(9, r.DistanceToPoint(new Vector2(0, 10)));
}