test/testjoystick.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 21 May 2006 17:26:40 +0000
changeset 1855 5ff2c01e475e
parent 1854 2280e314a978
child 1895 c121d94672cb
child 4071 3d9040dcc47e
permissions -rw-r--r--
Moved DirectInput joystick code to 1.3 branch
     1 
     2 /* Simple program to test the SDL joystick routines */
     3 
     4 #include <stdio.h>
     5 #include <stdlib.h>
     6 #include <string.h>
     7 
     8 #include "SDL.h"
     9 
    10 #define SCREEN_WIDTH	640
    11 #define SCREEN_HEIGHT	480
    12 
    13 void WatchJoystick(SDL_Joystick *joystick)
    14 {
    15 	SDL_Surface *screen;
    16 	const char *name;
    17 	int i, done;
    18 	SDL_Event event;
    19 	int x, y, draw;
    20 	SDL_Rect axis_area[2];
    21 
    22 	/* Set a video mode to display joystick axis position */
    23 	screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 16, 0);
    24 	if ( screen == NULL ) {
    25 		fprintf(stderr, "Couldn't set video mode: %s\n",SDL_GetError());
    26 		return;
    27 	}
    28 
    29 	/* Print info about the joystick we are watching */
    30 	name = SDL_JoystickName(SDL_JoystickIndex(joystick));
    31 	printf("Watching joystick %d: (%s)\n", SDL_JoystickIndex(joystick),
    32 	       name ? name : "Unknown Joystick");
    33 	printf("Joystick has %d axes, %d hats, %d balls, and %d buttons\n",
    34 	       SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick),
    35 	       SDL_JoystickNumBalls(joystick),SDL_JoystickNumButtons(joystick));
    36 
    37 	/* Initialize drawing rectangles */
    38 	memset(axis_area, 0, (sizeof axis_area));
    39 	draw = 0;
    40 
    41 	/* Loop, getting joystick events! */
    42 	done = 0;
    43 	while ( ! done ) {
    44 		while ( SDL_PollEvent(&event) ) {
    45 			switch (event.type) {
    46 			    case SDL_JOYAXISMOTION:
    47 				printf("Joystick %d axis %d value: %d\n",
    48 				       event.jaxis.which,
    49 				       event.jaxis.axis,
    50 				       event.jaxis.value);
    51 				break;
    52 			    case SDL_JOYHATMOTION:
    53 				printf("Joystick %d hat %d value:",
    54 				       event.jhat.which,
    55 				       event.jhat.hat);
    56 				if ( event.jhat.value == SDL_HAT_CENTERED )
    57 					printf(" centered");
    58 				if ( event.jhat.value & SDL_HAT_UP )
    59 					printf(" up");
    60 				if ( event.jhat.value & SDL_HAT_RIGHT )
    61 					printf(" right");
    62 				if ( event.jhat.value & SDL_HAT_DOWN )
    63 					printf(" down");
    64 				if ( event.jhat.value & SDL_HAT_LEFT )
    65 					printf(" left");
    66 				printf("\n");
    67 				break;
    68 			    case SDL_JOYBALLMOTION:
    69 				printf("Joystick %d ball %d delta: (%d,%d)\n",
    70 				       event.jball.which,
    71 				       event.jball.ball,
    72 				       event.jball.xrel,
    73 				       event.jball.yrel);
    74 				break;
    75 			    case SDL_JOYBUTTONDOWN:
    76 				printf("Joystick %d button %d down\n",
    77 				       event.jbutton.which,
    78 				       event.jbutton.button);
    79 				break;
    80 			    case SDL_JOYBUTTONUP:
    81 				printf("Joystick %d button %d up\n",
    82 				       event.jbutton.which,
    83 				       event.jbutton.button);
    84 				break;
    85 			    case SDL_KEYDOWN:
    86 				if ( event.key.keysym.sym != SDLK_ESCAPE ) {
    87 					break;
    88 				}
    89 				/* Fall through to signal quit */
    90 			    case SDL_QUIT:
    91 				done = 1;
    92 				break;
    93 			    default:
    94 				break;
    95 			}
    96 		}
    97 		/* Update visual joystick state */
    98 		for ( i=0; i<SDL_JoystickNumButtons(joystick); ++i ) {
    99 			SDL_Rect area;
   100 
   101 			area.x = i*34;
   102 			area.y = SCREEN_HEIGHT-34;
   103 			area.w = 32;
   104 			area.h = 32;
   105 			if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
   106 				SDL_FillRect(screen, &area, 0xFFFF);
   107 			} else {
   108 				SDL_FillRect(screen, &area, 0x0000);
   109 			}
   110 			SDL_UpdateRects(screen, 1, &area);
   111 		}
   112 
   113 		/* Erase previous axes */
   114 		SDL_FillRect(screen, &axis_area[draw], 0x0000);
   115 
   116 		/* Draw the X/Y axis */
   117 		draw = !draw;
   118 		x = (((int)SDL_JoystickGetAxis(joystick, 0))+32768);
   119 		x *= SCREEN_WIDTH;
   120 		x /= 65535;
   121 		if ( x < 0 ) {
   122 			x = 0;
   123 		} else
   124 		if ( x > (SCREEN_WIDTH-16) ) {
   125 			x = SCREEN_WIDTH-16;
   126 		}
   127 		y = (((int)SDL_JoystickGetAxis(joystick, 1))+32768);
   128 		y *= SCREEN_HEIGHT;
   129 		y /= 65535;
   130 		if ( y < 0 ) {
   131 			y = 0;
   132 		} else
   133 		if ( y > (SCREEN_HEIGHT-16) ) {
   134 			y = SCREEN_HEIGHT-16;
   135 		}
   136 		axis_area[draw].x = (Sint16)x;
   137 		axis_area[draw].y = (Sint16)y;
   138 		axis_area[draw].w = 16;
   139 		axis_area[draw].h = 16;
   140 		SDL_FillRect(screen, &axis_area[draw], 0xFFFF);
   141 
   142 		SDL_UpdateRects(screen, 2, axis_area);
   143 	}
   144 }
   145 
   146 int main(int argc, char *argv[])
   147 {
   148 	const char *name;
   149 	int i;
   150 	SDL_Joystick *joystick;
   151 
   152 	/* Initialize SDL (Note: video is required to start event loop) */
   153 	if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK) < 0 ) {
   154 		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
   155 		exit(1);
   156 	}
   157 
   158 	/* Print information about the joysticks */
   159 	printf("There are %d joysticks attached\n", SDL_NumJoysticks());
   160 	for ( i=0; i<SDL_NumJoysticks(); ++i ) {
   161 		name = SDL_JoystickName(i);
   162 		printf("Joystick %d: %s\n",i,name ? name : "Unknown Joystick");
   163 	}
   164 
   165 	if ( argv[1] ) {
   166 		joystick = SDL_JoystickOpen(atoi(argv[1]));
   167 		if ( joystick == NULL ) {
   168 			printf("Couldn't open joystick %d: %s\n", atoi(argv[1]),
   169 			       SDL_GetError());
   170 		} else {
   171 			WatchJoystick(joystick);
   172 			SDL_JoystickClose(joystick);
   173 		}
   174 	}
   175 	SDL_QuitSubSystem(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK);
   176 
   177 	return(0);
   178 }