public virtual void SetRotation(float r, float x, float y)
{
if (rotation != r)
{
this.CallTransform(Matrix3.CreateRotateTransform(rotation = (r / 180f * MathUtils.PI), x, y));
}
}
public virtual void SetRotation(float r)
{
if (rotation != r)
{
this.CallTransform(Matrix3.CreateRotateTransform(rotation = (r / 180f * MathUtils.PI), this.center[0],
this.center[1]));
}
}
public static Matrix3 CreateRotateTransform(float angle, float x, float y)
{
Matrix3 temp = Matrix3.CreateRotateTransform(angle);
float sinAngle = temp.val[3];
float oneMinusCosAngle = 1.0f - temp.val[4];
temp.val[2] = x * oneMinusCosAngle + y * sinAngle;
temp.val[5] = y * oneMinusCosAngle - x * sinAngle;
return(temp);
}
