public void RotateAroundTest()
{
var a = Vector2.Zero;
var t = Transformation2D.CreateRotationAround(-1, -1, 90f);
var expectedA = -2 * Vector2.UnitX;
Assert.AreEqual(expectedA, t.Transform(a));
}
private void Update(float updatePeriod)
{
rotCenter.X += updatePeriod * 0.1f;
var t = Transformation2D.CreateRotationAround(rotCenter.X, rotCenter.Y, updatePeriod * 200f);
foreach (var bird in birds)
{
bird.TransformCenter(t);
}
}
