0
|
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 }
|