| 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 | joystick = SDL_JoystickOpen(i); |
| 164 | if (joystick == NULL) { |
| 165 | fprintf(stderr, "SDL_JoystickOpen(%d) failed: %s\n", i, SDL_GetError()); |
| 166 | } else { |
| 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); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | if ( argv[1] ) { |
| 176 | joystick = SDL_JoystickOpen(atoi(argv[1])); |
| 177 | if ( joystick == NULL ) { |
| 178 | printf("Couldn't open joystick %d: %s\n", atoi(argv[1]), |
| 179 | SDL_GetError()); |
| 180 | } else { |
| 181 | WatchJoystick(joystick); |
| 182 | SDL_JoystickClose(joystick); |
| 183 | } |
| 184 | } |
| 185 | SDL_QuitSubSystem(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK); |
| 186 | |
| 187 | return(0); |
| 188 | } |