al_set_mouse_wheel_precision(3)                al_set_mouse_wheel_precision(3)

NAME
       al_set_mouse_wheel_precision - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              void al_set_mouse_wheel_precision(int precision)


DESCRIPTION
       Sets the precision of the mouse wheel (the z and w coordinates).  This
       precision manifests itself as a multiplier on the dz and dw fields in
       mouse events.  It also affects the z and w fields of events and
       ALLEGRO_MOUSE_STATE(3), but not in a simple way if you alter the
       precision often, so it is suggested to reset those axes to 0 when you
       change precision.  Setting this to a high value allows you to detect
       small changes in those two axes for some high precision mice.  A
       flexible way of using this precision is to set it to a high value (120
       is likely sufficient for most, if not all, mice) and use a floating
       point dz and dw like so:


              al_set_mouse_wheel_precision(120);

              ALLEGRO_EVENT event;
              al_wait_for_event(event_queue, &event);
              if (event.type == ALLEGRO_EVENT_MOUSE_AXES) {
                double dz = (double)event.mouse.dz / al_get_mouse_wheel_precision();
                /* Use dz in some way... */
              }


       Precision is set to 1 by default.  It is impossible to set it to a
       lower precision than that.

SINCE
       5.1.10

SEE ALSO
       al_get_mouse_wheel_precision(3)

Allegro reference manual                       al_set_mouse_wheel_precision(3)