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.

Svgalib 1.3.0                                     14 April 1998                              joystick_getaxis(3)