public void rotateTest()
{
Point p = new Point(1, 0);
double rotation = Math.PI / 2;
Point expected = new Point(0, 1);
Point actual = p.rotatePointAboutOrigin(rotation);
double epsilon = Math.Pow(10, -10);
Assert.IsTrue(Math.Abs(expected.x - actual.x) < epsilon);
Assert.IsTrue(Math.Abs(expected.y - actual.y) < epsilon);
rotation *= -1;
expected.x = 0;
expected.y = -1;
actual = p.rotatePointAboutOrigin(rotation);
Assert.IsTrue(Math.Abs(expected.x - actual.x) < epsilon);
Assert.IsTrue(Math.Abs(expected.y - actual.y) < epsilon);
rotation = Math.PI / 4;
expected.x = 1 / Math.Sqrt(2);
expected.y = 1 / Math.Sqrt(2);
actual = p.rotatePointAboutOrigin(rotation);
Assert.IsTrue(Math.Abs(expected.x - actual.x) < epsilon);
Assert.IsTrue(Math.Abs(expected.y - actual.y) < epsilon);
}
public static Point rotatePointAboutOrigin(double rotation, Point p)
{
return p.rotatePointAboutOrigin(rotation);
}
