al_rotate_transform - Allegro 5 API

       Apply a rotation to a transformation.

       Parameters:

       • trans - Transformation to alter

       • theta - Rotation angle in radians

       al_rotate_transform - Allegro 5 API

al_translate_transform(3alleg5), al_scale_transform(3alleg5), al_build_transform(3alleg5)

Allegro reference manual                                                            al_rotate_transform(3alleg5)

              #include <allegro5/allegro.h>

              void al_rotate_transform(ALLEGRO_TRANSFORM *trans, float theta)