2 /* Simple program to test the SDL joystick routines */
10 #define SCREEN_WIDTH 640
11 #define SCREEN_HEIGHT 480
13 void WatchJoystick(SDL_Joystick *joystick)
20 SDL_Rect axis_area[2];
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());
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));
37 /* Initialize drawing rectangles */
38 memset(axis_area, 0, (sizeof axis_area));
41 /* Loop, getting joystick events! */
44 while ( SDL_PollEvent(&event) ) {
46 case SDL_JOYAXISMOTION:
47 printf("Joystick %d axis %d value: %d\n",
52 case SDL_JOYHATMOTION:
53 printf("Joystick %d hat %d value:",
56 if ( event.jhat.value == SDL_HAT_CENTERED )
58 if ( event.jhat.value & SDL_HAT_UP )
60 if ( event.jhat.value & SDL_HAT_RIGHT )
62 if ( event.jhat.value & SDL_HAT_DOWN )
64 if ( event.jhat.value & SDL_HAT_LEFT )
68 case SDL_JOYBALLMOTION:
69 printf("Joystick %d ball %d delta: (%d,%d)\n",
75 case SDL_JOYBUTTONDOWN:
76 printf("Joystick %d button %d down\n",
78 event.jbutton.button);
81 printf("Joystick %d button %d up\n",
83 event.jbutton.button);
86 if ( event.key.keysym.sym != SDLK_ESCAPE ) {
89 /* Fall through to signal quit */
97 /* Update visual joystick state */
98 for ( i=0; i<SDL_JoystickNumButtons(joystick); ++i ) {
102 area.y = SCREEN_HEIGHT-34;
105 if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
106 SDL_FillRect(screen, &area, 0xFFFF);
108 SDL_FillRect(screen, &area, 0x0000);
110 SDL_UpdateRects(screen, 1, &area);
113 /* Erase previous axes */
114 SDL_FillRect(screen, &axis_area[draw], 0x0000);
116 /* Draw the X/Y axis */
118 x = (((int)SDL_JoystickGetAxis(joystick, 0))+32768);
124 if ( x > (SCREEN_WIDTH-16) ) {
127 y = (((int)SDL_JoystickGetAxis(joystick, 1))+32768);
133 if ( y > (SCREEN_HEIGHT-16) ) {
134 y = SCREEN_HEIGHT-16;
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);
142 SDL_UpdateRects(screen, 2, axis_area);
146 int main(int argc, char *argv[])
150 SDL_Joystick *joystick;
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());
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 joystick = SDL_JoystickOpen(i);
164 if (joystick == NULL) {
165 fprintf(stderr, "SDL_JoystickOpen(%d) failed: %s\n", i, SDL_GetError());
167 printf(" axes: %d\n", SDL_JoystickNumAxes(joystick));
168 printf(" balls: %d\n", SDL_JoystickNumBalls(joystick));
169 printf(" hats: %d\n", SDL_JoystickNumHats(joystick));
170 printf(" buttons: %d\n", SDL_JoystickNumButtons(joystick));
171 SDL_JoystickClose(joystick);
176 joystick = SDL_JoystickOpen(atoi(argv[1]));
177 if ( joystick == NULL ) {
178 printf("Couldn't open joystick %d: %s\n", atoi(argv[1]),
181 WatchJoystick(joystick);
182 SDL_JoystickClose(joystick);
185 SDL_QuitSubSystem(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK);