public void TestPointNearZero()
{
float a = 2.5F;
float b = 1.25F;
PointF center = new PointF(3F, 2F);
PointF test = new PointF(3.01F, 2.01F);
PointF intersection = EllipsePrimitive.IntersectEllipseAndLine(a, b, center, test);
VerifyPointOnEllipse(a, b, center, intersection);
}
public void TestMinorAxisZero()
{
float a = 2.5F;
float b = 0F;
PointF center = new PointF(3F, 2F);
PointF test = new PointF(13F, 7F);
PointF intersection = EllipsePrimitive.IntersectEllipseAndLine(a, b, center, test);
//intersection is at center.
Assert.IsTrue(FloatComparer.AreEqual(center, intersection), "ellipse intersection point is not correct!");
}
public void TestPointVeryCloseToZero()
{
float a = 2.5F;
float b = 1.25F;
PointF center = new PointF(3F, 2F);
PointF test = new PointF(3.0001F, 2.0001F);
PointF intersection = EllipsePrimitive.IntersectEllipseAndLine(a, b, center, test);
//intersection is at center.
Assert.IsTrue(FloatComparer.AreEqual(center, intersection), "ellipse intersection point is not correct!");
}
public void TestPointOutside()
{
float a = -2.5F;
float b = -1.25F;
PointF center = new PointF(3F, 2F);
PointF test = new PointF(13F, 7F);
PointF result = new PointF(4.767767F, 2.883884F);
PointF intersection = EllipsePrimitive.IntersectEllipseAndLine(a, b, center, test);
VerifyPointOnEllipse(a, b, center, intersection);
Assert.IsTrue(FloatComparer.AreEqual(result, intersection), "ellipse intersection point is not correct!");
}
public void SimpleTest()
{
//for a circle of radius=1, test point = 1,1, intesection is 1/sqrt(2), 1/sqrt(2)
float a = 1F;
float b = 1F;
PointF center = new PointF(0, 0);
float root2Inverse = 1F / (float)Math.Sqrt(2);
PointF result = new PointF(root2Inverse, root2Inverse);
PointF intersection = EllipsePrimitive.IntersectEllipseAndLine(a, b, center, new PointF(1, 1));
VerifyPointOnEllipse(a, b, center, intersection);
Assert.IsTrue(FloatComparer.AreEqual(result, intersection), "ellipse intersection point is not correct!");
}
