public Transform Rotate(float angle)
{
float rad = Calc.ToRadians(angle);
float cos = Calc.Cos(rad);
float sin = Calc.Sin(rad);
var rotation = new Transform(cos, -sin, 0f, sin, cos, 0f, 0f, 0f, 1f);
return(Combine(rotation));
}
public Transform Rotate(float angle, float center_x, float center_y)
{
float rad = Calc.ToRadians(angle);
float cos = Calc.Cos(rad);
float sin = Calc.Sin(rad);
var rotation = new Transform(
cos, -sin, center_x * (1 - cos) + center_y * sin,
sin, cos, center_y * (1 - cos) - center_x * sin,
0f, 0f, 1f
);
return(Combine(rotation));
}
