/*

  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied

  warranty.  In no event will the authors be held liable for any damages

  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,

  including commercial applications, and to alter it and redistribute it

  freely.

*/

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

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "SDL.h"

#ifdef __IPHONEOS__

#define SCREEN_WIDTH	320

#define SCREEN_HEIGHT	480

#else

#define SCREEN_WIDTH	640

#define SCREEN_HEIGHT	480

#endif

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[6][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);

        }

        for (i = 0;

             i < SDL_JoystickNumAxes(joystick) / 2

             && i < SDL_arraysize(axis_area); ++i) {

            /* Erase previous axes */

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

            /* Draw the X/Y axis */

            draw = !draw;

            x = (((int) SDL_JoystickGetAxis(joystick, i * 2 + 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, i * 2 + 1)) + 32768);

            y *= SCREEN_HEIGHT;

            y /= 65535;

            if (y < 0) {

                y = 0;

            } else if (y > (SCREEN_HEIGHT - 16)) {

                y = SCREEN_HEIGHT - 16;

            }

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

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

            axis_area[i][draw].w = 16;

            axis_area[i][draw].h = 16;

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

            SDL_UpdateRects(screen, 2, axis_area[i]);

        }

    }

}

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");

        joystick = SDL_JoystickOpen(i);

        if (joystick == NULL) {

            fprintf(stderr, "SDL_JoystickOpen(%d) failed: %s\n", i,

                    SDL_GetError());

        } else {

            printf("       axes: %d\n", SDL_JoystickNumAxes(joystick));

            printf("      balls: %d\n", SDL_JoystickNumBalls(joystick));

            printf("       hats: %d\n", SDL_JoystickNumHats(joystick));

            printf("    buttons: %d\n", SDL_JoystickNumButtons(joystick));

            SDL_JoystickClose(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);

}