view test/testjoystick.c @ 855:aa4ac9e65d92

I noticed MacOSX SDL sets up working directory to parent of executable. On BeOS is should setup it the same way, but it only does when Tracker wasn't restarted. I checked code and it looks like a hack to me :( It looks for env variable and than comapres it to default when OpenTracker was started after boot, and wasn't restarted. That's probably ok, for that exact case. Unfortunetly that variable isn't always like that. For example, after Tracker crashes and is restarted, env variable most probably is different (depends on how Tracker was restarted, by what application, etc... for example: i have launcher application from which i can restart Tracker, and after that nev variable points to that application's directory, not Tracker's).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Feb 2004 18:58:40 +0000 (2004-02-24)
parents 74212992fb08
children 281d3f4870e5
line wrap: on
line source

/* 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[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);
		}

		/* Erase previous axes */
		SDL_FillRect(screen, &axis_area[draw], 0x0000);

		/* Draw the X/Y axis */
		draw = !draw;
		x = (((int)SDL_JoystickGetAxis(joystick, 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, 1))+32768);
		y *= SCREEN_HEIGHT;
		y /= 65535;
		if ( y < 0 ) {
			y = 0;
		} else
		if ( y > (SCREEN_HEIGHT-16) ) {
			y = SCREEN_HEIGHT-16;
		}
		axis_area[draw].x = (Sint16)x;
		axis_area[draw].y = (Sint16)y;
		axis_area[draw].w = 16;
		axis_area[draw].h = 16;
		SDL_FillRect(screen, &axis_area[draw], 0xFFFF);

		SDL_UpdateRects(screen, 2, axis_area);
	}
}

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);
}