public void Angle180()
{
float error = 1e-4f;
Vector2f v = new Vector2f(1, 0);
for (int i = 0; i <= 360; i++)
{
double di = i / 360.0f;
double theta = 2.0 * Math.PI * di;
float x = (float)Math.Cos(theta);
float y = (float)Math.Sin(theta);
int j = (i > 180) ? 360 - i : i;
Assert.IsTrue(NearlyEqual(j, Vector2f.Angle180(v, new Vector2f(x, y)), error));
}
v = new Vector2f(1, -1);
for (int i = 0; i <= 360; i++)
{
double di = i / 360.0f;
double theta = 2.0 * Math.PI * di;
float x = (float)Math.Cos(theta);
float y = (float)Math.Sin(theta);
int j = (i + 45) % 360;
j = (j > 180) ? 360 - j : j;
Assert.IsTrue(NearlyEqual(j, Vector2f.Angle180(v, new Vector2f(x, y)), error));
}
}