NAME

       al_use_transform - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              void al_use_transform(const ALLEGRO_TRANSFORM *trans)

DESCRIPTION

       Sets the transformation to be used for the the drawing operations on the target bitmap (each bitmap main‐
       tains  its  own  transformation).  Every drawing operation after this call will be transformed using this
       transformation.  Call this function with an identity transformation to return to the default behaviour.

       This function does nothing if there is no target bitmap.

       The parameter is passed by reference as an optimization to avoid the overhead of stack copying.  The ref‐
       erence will not be stored in the Allegro library so it is safe to pass references to local variables.

              void setup_my_transformation(void)
              {
                 ALLEGRO_TRANSFORM transform;
                 al_translate_transform(&transform, 5, 10);
                 al_use_transform(&transform);
              }

       Parameters:

       • trans - Transformation to use

SEE ALSO

       al_get_current_transform(3alleg5), al_transform_coordinates(3alleg5)

Allegro reference manual                                                               al_use_transform(3alleg5)