/* Simple program to test the SDL joystick routines */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "SDL.h"

#define SCREEN_WIDTH 640

#define SCREEN_HEIGHT 480

void WatchJoystick(SDL_Joystick *joystick)

{

SDL_Surface *screen;

const char *name;

int i, done;

SDL_Event event;

int x, y, draw;

SDL_Rect axis_area[2];

/* Set a video mode to display joystick axis position */

screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 16, 0);

if ( screen == NULL ) {

fprintf(stderr, "Couldn't set video mode: %s\n",SDL_GetError());

return;

}

/* Print info about the joystick we are watching */

name = SDL_JoystickName(SDL_JoystickIndex(joystick));

printf("Watching joystick %d: (%s)\n", SDL_JoystickIndex(joystick),

name ? name : "Unknown Joystick");

printf("Joystick has %d axes, %d hats, %d balls, and %d buttons\n",

SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick),

SDL_JoystickNumBalls(joystick),SDL_JoystickNumButtons(joystick));

/* Initialize drawing rectangles */

memset(axis_area, 0, (sizeof axis_area));

draw = 0;

/* Loop, getting joystick events! */

done = 0;

while ( ! done ) {

while ( SDL_PollEvent(&event) ) {

switch (event.type) {

case SDL_JOYAXISMOTION:

printf("Joystick %d axis %d value: %d\n",

event.jaxis.which,

event.jaxis.axis,

event.jaxis.value);

break;

case SDL_JOYHATMOTION:

printf("Joystick %d hat %d value:",

event.jhat.which,

event.jhat.hat);

if ( event.jhat.value == SDL_HAT_CENTERED )

printf(" centered");

if ( event.jhat.value & SDL_HAT_UP )

printf(" up");

if ( event.jhat.value & SDL_HAT_RIGHT )

printf(" right");

if ( event.jhat.value & SDL_HAT_DOWN )

printf(" down");

if ( event.jhat.value & SDL_HAT_LEFT )

printf(" left");

printf("\n");

break;

case SDL_JOYBALLMOTION:

printf("Joystick %d ball %d delta: (%d,%d)\n",

event.jball.which,

event.jball.ball,

event.jball.xrel,

event.jball.yrel);

break;

case SDL_JOYBUTTONDOWN:

printf("Joystick %d button %d down\n",

event.jbutton.which,

event.jbutton.button);

break;

case SDL_JOYBUTTONUP:

printf("Joystick %d button %d up\n",

event.jbutton.which,

event.jbutton.button);

break;

case SDL_KEYDOWN:

if ( event.key.keysym.sym != SDLK_ESCAPE ) {

break;

}

/* Fall through to signal quit */

case SDL_QUIT:

done = 1;

break;

default:

break;

}

}

/* Update visual joystick state */

for ( i=0; i<SDL_JoystickNumButtons(joystick); ++i ) {

SDL_Rect area;

area.x = i*34;

area.y = SCREEN_HEIGHT-34;

area.w = 32;

area.h = 32;

if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {

SDL_FillRect(screen, &area, 0xFFFF);

} else {

SDL_FillRect(screen, &area, 0x0000);

}

SDL_UpdateRects(screen, 1, &area);

}

/* Erase previous axes */

SDL_FillRect(screen, &axis_area[draw], 0x0000);

/* Draw the X/Y axis */

draw = !draw;

x = (((int)SDL_JoystickGetAxis(joystick, 0))+32768);

x *= SCREEN_WIDTH;

x /= 65535;

if ( x < 0 ) {

x = 0;

} else

if ( x > (SCREEN_WIDTH-16) ) {

x = SCREEN_WIDTH-16;

}

y = (((int)SDL_JoystickGetAxis(joystick, 1))+32768);

y *= SCREEN_HEIGHT;

y /= 65535;

if ( y < 0 ) {

y = 0;

} else

if ( y > (SCREEN_HEIGHT-16) ) {

y = SCREEN_HEIGHT-16;

}

axis_area[draw].x = (Sint16)x;

axis_area[draw].y = (Sint16)y;

axis_area[draw].w = 16;

axis_area[draw].h = 16;

SDL_FillRect(screen, &axis_area[draw], 0xFFFF);

SDL_UpdateRects(screen, 2, axis_area);

}

}

int main(int argc, char *argv[])

{

const char *name;

int i;

SDL_Joystick *joystick;

/* Initialize SDL (Note: video is required to start event loop) */

if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK) < 0 ) {

fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());

exit(1);

}

/* Print information about the joysticks */

printf("There are %d joysticks attached\n", SDL_NumJoysticks());

for ( i=0; i<SDL_NumJoysticks(); ++i ) {

name = SDL_JoystickName(i);

printf("Joystick %d: %s\n",i,name ? name : "Unknown Joystick");

}

if ( argv[1] ) {

joystick = SDL_JoystickOpen(atoi(argv[1]));

if ( joystick == NULL ) {

printf("Couldn't open joystick %d: %s\n", atoi(argv[1]),

SDL_GetError());

} else {

WatchJoystick(joystick);

SDL_JoystickClose(joystick);

}

}

SDL_QuitSubSystem(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK);

return(0);

}