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.TH "al_set_mouse_wheel_precision" "3alleg5" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_set_mouse_wheel_precision - Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include <allegro5/allegro.h>

void al_set_mouse_wheel_precision(int precision)
\f[R]
.fi
.SH DESCRIPTION
.PP
Sets the precision of the mouse wheel (the z and w coordinates).
This precision manifests itself as a multiplier on the \f[C]dz\f[R] and
\f[C]dw\f[R] fields in mouse events.
It also affects the \f[C]z\f[R] and \f[C]w\f[R] fields of events and
ALLEGRO_MOUSE_STATE(3alleg5), 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 \f[C]dz\f[R] and \f[C]dw\f[R] like so:
.IP
.nf
\f[C]
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... */
}
\f[R]
.fi
.PP
Precision is set to 1 by default.
It is impossible to set it to a lower precision than that.
.SH SINCE
.PP
5.1.10
.SH SEE ALSO
.PP
al_get_mouse_wheel_precision(3alleg5)