static GMatrix matrix_rotate(int w, int h) {
GMatrix matrix;
matrix.setTranslate(w/2, h/2);
matrix.preRotate(M_PI / 6);
matrix.preTranslate(-w/2, -h/2);
return matrix;
}
static GMatrix matrix_scale(int w, int h) {
GMatrix matrix;
matrix.setTranslate(10, 10);
matrix.preScale(0.75f, 0.75f);
return matrix;
}
static GMatrix matrix_flip_y(int w, int h) {
GMatrix matrix;
matrix.setTranslate(0, h);
matrix.preScale(1, -1);
return matrix;
}
static GMatrix matrix_flip_x(int w, int h) {
GMatrix matrix;
matrix.setTranslate(w, 0);
matrix.preScale(-1, 1);
return matrix;
}
