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.