| |
| /* 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[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"); |
| } |
| |
| 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); |
| } |