joystick_sethandler(3) Svgalib User Manual joystick_sethandler(3)NAME
joystick_sethandler, joystick_setdefaulthandler - set the joystick
event handler.
SYNOPSIS
#include <vgajoystick.h>
typedef void (*__joystick_handler) (int event, int number, char value,
int joydev);
void joystick_sethandler(int joydev, __joystick_handler jh);
void joystick_setdefaulthandler(int joydev);
DESCRIPTION
By default, each call to joystick_init(3) enables the default handler
for the opened joystick. This handler maintains a state table which can
be read by the joystick_getaxis(3), joystick_getbutton(3), joy‐
stick_button1|2|3|4(3), joystick_getb1|2|3|4(3), joystick_x|y|z(3) and
joystick_getx|y|z(3) functions.
If you define an own handler, the following parameters are passed:
event one of the following values:
JOY_EVENTBUTTONDOWN a button was pressed.
JOY_EVENTBUTTONUP a button was released.
JOY_EVENTAXIS the joystick position was changed.
All other values are reserved for future use.
number identifies the button or axis to which this event
belongs.
value for axis events the new position in range -128 .. 127.See
joystick_getaxis(3) for further comments on the range.
joydev identifies the joystick affected (this allows to use one
handler for many joysticks).
joydev = -1 modifies the event handler of all currently open joystick
devices.
CAVEATS
This function is only available in ELF versions of svgalib. Due to
backwards compatibility issues it cannot be used with shared a.out
libs.
SEE ALSOsvgalib(7), vgagl(7), libvga.config(5), joytest(6), mjoytest(6), joy‐
stick_init(3), joystick_close(3), joystick_update(3), joystick_getnu‐
maxes(3), joystick_getnumbuttons(3), joystick_getaxis(3), joystick_get‐
button(3), joystick_button1(3), joystick_getb1(3), joystick_x(3), joy‐
stick_getx(3).
AUTHOR
The svgalib joystick handler was mostly done by Daniel Engstr\"om
<daniel.engstrom@riksnett.no>. Multiple joystick, VC switching support
and code to glue it into svgalib by Michael Weller <eowmob@exp-
math.uni-essen.de>. Part of the code is based on code from C. Smith and
Vojtech Pavlik.
Svgalib 1.3.0 14 April 1998 joystick_sethandler(3)
