Provided by: libsvga1-dev_1.4.3-27ubuntu1_i386 bug

NAME

       joystick_getaxis,  joystick_getbutton  -  query  the current state of a
       joystick.

SYNOPSIS

       #include <vgajoystick.h>

       char joystick_getaxis(int joydev, int a);
       char joystick_getbutton(int joydev, int b);

DESCRIPTION

       These functions  query  the  current  state  of  the  joystick  joydev.
       Actually   this   is   the   state   found  during  the  last  call  to
       joystick_update(3) with the default joystick event handler active.

       joystick_getaxis(joydev, a) return the current state of the given  axis
       (usually  it  is x - 0, y - 1, z - 1, ...)  in range -128 .. 127.  Some
       effort is made such that the center position is close to 0.

       Note that especially the version 0.* protocol joystick  calibration  is
       very  bad.  You  won’t  usually  see  the  extrem values on the extreme
       position. Also, the center position will be close to zero but often not
       be  exactly zero and return values will also vary slightly from call to
       call even when the user did not move the joystick.

       joystick_getbutton(joydev, b) returns the state of a button. It returns
       1  for  pressed  button  and  0  else. Note that no hardware checks for
       button clicks. The button press is  only  detected  during  a  call  to
       joystick_update(3) (at least in the 0.* protocol).

       NOTE:  The  functions  simply  return  the  data  passed to the default
       joystick event handler!

       For your convenience, the following stortcuts have been established  by
       use of the preprocessor:

              joystick_button1(i) for joystick_getbutton(i, 0).
              joystick_button2(i) for joystick_getbutton(i, 1).
              joystick_button3(i) for joystick_getbutton(i, 2).
              joystick_button4(i) for joystick_getbutton(i, 3).

              joystick_x(i) for joystick_getaxis(i, 0).
              joystick_y(i) for joystick_getaxis(i, 1).
              joystick_z(i) for joystick_getaxis(i, 2).

              joystick_getb1() for joystick_getbutton(0, 0).
              joystick_getb2() for joystick_getbutton(0, 1).
              joystick_getb3() for joystick_getbutton(0, 2).
              joystick_getb4() for joystick_getbutton(0, 3).

              joystick_getx() for joystick_getaxis(0, 0).
              joystick_gety() for joystick_getaxis(0, 1).
              joystick_getz() for joystick_getaxis(0, 2).

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 ALSO

       svgalib(7),   vgagl(7),   libvga.config(5),   joytest(6),  mjoytest(6),
       joystick_init(3),        joystick_close(3),         joystick_update(3),
       joystick_sethandler(3),                  joystick_setdefaulthandler(3),
       joystick_getnumaxes(3), joystick_getnumbuttons(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.