| public static Cos ( float value ) : float | ||
| value | float | The value. |
| return | float | |
/// <summary>
/// Rotates the specified vector.
/// </summary>
/// <param name="vector">The vector.</param>
/// <param name="angle">The angle.</param>
public static Vector2 Rotate(Vector2 vector, float angle)
{
float rx = vector.X * MathHelper.Cos(angle) - vector.Y * MathHelper.Sin(angle);
float ry = vector.X * MathHelper.Sin(angle) + vector.Y * MathHelper.Cos(angle);
return(new Vector2(rx, ry));
}
/// <summary>
/// Updates the Ellipse if something changed.
/// </summary>
private void UpdateEllipse()
{
var points = new List <Vector2>();
for (int i = 1; i <= 360; i++)
{
points.Add(new Vector2(RadiusX * MathHelper.Cos(i * (float)MathHelper.PiOverOneEighty) + _position.X,
RadiusY * MathHelper.Sin(i * (float)MathHelper.PiOverOneEighty) + _position.Y));
}
_polygon = new Polygon(points.ToArray());
}
