1al_set_mouse_wheel_precision(3)                al_set_mouse_wheel_precision(3)
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NAME

6       al_set_mouse_wheel_precision - Allegro 5 API
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SYNOPSIS

9              #include <allegro5/allegro.h>
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11              void al_set_mouse_wheel_precision(int precision)
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DESCRIPTION

14       Sets  the precision of the mouse wheel (the z and w coordinates).  This
15       precision manifests itself as a multiplier on the dz and dw  fields  in
16       mouse  events.   It also affects the z and w fields of events and ALLE‐
17       GRO_MOUSE_STATE(3), but not in a simple way if you alter the  precision
18       often, so it is suggested to reset those axes to 0 when you change pre‐
19       cision.  Setting this to a  high  value  allows  you  to  detect  small
20       changes in those two axes for some high precision mice.  A flexible way
21       of using this precision is to set it to a high  value  (120  is  likely
22       sufficient  for most, if not all, mice) and use a floating point dz and
23       dw like so:
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25              al_set_mouse_wheel_precision(120);
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27              ALLEGRO_EVENT event;
28              al_wait_for_event(event_queue, &event);
29              if (event.type == ALLEGRO_EVENT_MOUSE_AXES) {
30                double dz = (double)event.mouse.dz / al_get_mouse_wheel_precision();
31                /* Use dz in some way... */
32              }
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34       Precision is set to 1 by default.  It is impossible to set it to a low‐
35       er precision than that.
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SINCE

38       5.1.10
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SEE ALSO

41       al_get_mouse_wheel_precision(3)
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45Allegro reference manual                       al_set_mouse_wheel_precision(3)
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