al_build_transform(3) al_build_transform(3)

al_build_transform - Allegro 5 API

#include <allegro5/allegro.h>
void al_build_transform(ALLEGRO_TRANSFORM *trans, float x, float y,
   float sx, float sy, float theta)

Builds a transformation given some parameters. This call is equivalent to calling the transformations in this order: make identity, rotate, scale, translate. This method is faster, however, than actually calling those functions.


trans - Transformation to alter
x, y - Translation
sx, sy - Scale
theta - Rotation angle in radians

Note: this function was previously documented to be equivalent to a different (and more useful) order of operations: identity, scale, rotate, translate.

al_translate_transform(3), al_rotate_transform(3), al_scale_transform(3), al_compose_transform(3)

Allegro reference manual