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.