Function AffineTransformRotate

core/math/AffineTransform.cpp:134–141

}

AffineTransform AffineTransformRotate(const AffineTransform& t, float anAngle)
{
    float sine   = sinf(anAngle);
    float cosine = cosf(anAngle);

    return AffineTransformMake(t.a * cosine + t.c * sine, t.b * cosine + t.d * sine, t.c * cosine - t.a * sine,
                                   t.d * cosine - t.b * sine, t.tx, t.ty);
}

/* Concatenate `t2' to `t1' and return the result:
     t' = t1 * t2 */