FireflyGL.Camera.GetApsoluteMouse C# (CSharp) Method

        public Vector2 GetApsoluteMouse(int X, int Y)
        {
            float x, y;
            x = X;
            y = Y;
            x -= Firefly.Window.Width/2;
            y -= Firefly.Window.Height/2;
            x /= zoom;
            y /= zoom;
            var angle = (float) Math.Atan2(y, x);
            angle -= rotation;
            var distance = (float) Math.Sqrt(x*x + y*y);
            x = (float) Math.Cos(angle)*distance;
            y = (float) Math.Sin(angle)*distance;
            x -= this.x;
            y -= this.y;

            return new Vector2(x, y);
        }