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1
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2 /* Simple program to test the SDL joystick routines */
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3
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4 #include <stdio.h>
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5 #include <stdlib.h>
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6 #include <string.h>
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7
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8 #include "SDL.h"
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9
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10 #define SCREEN_WIDTH 640
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11 #define SCREEN_HEIGHT 480
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12
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13 void WatchJoystick(SDL_Joystick *joystick)
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14 {
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15 SDL_Surface *screen;
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16 const char *name;
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17 int i, done;
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18 SDL_Event event;
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19 int x, y, draw;
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20 SDL_Rect axis_area[2];
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21
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22 /* Set a video mode to display joystick axis position */
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23 screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 16, 0);
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24 if ( screen == NULL ) {
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25 fprintf(stderr, "Couldn't set video mode: %s\n",SDL_GetError());
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26 return;
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27 }
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28
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29 /* Print info about the joystick we are watching */
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30 name = SDL_JoystickName(SDL_JoystickIndex(joystick));
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31 printf("Watching joystick %d: (%s)\n", SDL_JoystickIndex(joystick),
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32 name ? name : "Unknown Joystick");
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33 printf("Joystick has %d axes, %d hats, %d balls, and %d buttons\n",
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34 SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick),
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35 SDL_JoystickNumBalls(joystick),SDL_JoystickNumButtons(joystick));
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36
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37 /* Initialize drawing rectangles */
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38 memset(axis_area, 0, (sizeof axis_area));
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39 draw = 0;
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40
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41 /* Loop, getting joystick events! */
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42 done = 0;
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43 while ( ! done ) {
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44 while ( SDL_PollEvent(&event) ) {
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45 switch (event.type) {
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46 case SDL_JOYAXISMOTION:
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47 printf("Joystick %d axis %d value: %d\n",
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48 event.jaxis.which,
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49 event.jaxis.axis,
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50 event.jaxis.value);
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51 break;
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52 case SDL_JOYHATMOTION:
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53 printf("Joystick %d hat %d value:",
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54 event.jhat.which,
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55 event.jhat.hat);
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56 if ( event.jhat.value == SDL_HAT_CENTERED )
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57 printf(" centered");
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58 if ( event.jhat.value & SDL_HAT_UP )
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59 printf(" up");
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60 if ( event.jhat.value & SDL_HAT_RIGHT )
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61 printf(" right");
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62 if ( event.jhat.value & SDL_HAT_DOWN )
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63 printf(" down");
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64 if ( event.jhat.value & SDL_HAT_LEFT )
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65 printf(" left");
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66 printf("\n");
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67 break;
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68 case SDL_JOYBALLMOTION:
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69 printf("Joystick %d ball %d delta: (%d,%d)\n",
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70 event.jball.which,
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71 event.jball.ball,
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72 event.jball.xrel,
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73 event.jball.yrel);
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74 break;
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75 case SDL_JOYBUTTONDOWN:
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76 printf("Joystick %d button %d down\n",
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77 event.jbutton.which,
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78 event.jbutton.button);
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79 break;
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80 case SDL_JOYBUTTONUP:
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81 printf("Joystick %d button %d up\n",
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82 event.jbutton.which,
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83 event.jbutton.button);
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84 break;
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85 case SDL_KEYDOWN:
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86 if ( event.key.keysym.sym != SDLK_ESCAPE ) {
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87 break;
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88 }
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89 /* Fall through to signal quit */
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90 case SDL_QUIT:
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91 done = 1;
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92 break;
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93 default:
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94 break;
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95 }
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96 }
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97 /* Update visual joystick state */
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98 for ( i=0; i<SDL_JoystickNumButtons(joystick); ++i ) {
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99 SDL_Rect area;
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100
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101 area.x = i*34;
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102 area.y = SCREEN_HEIGHT-34;
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103 area.w = 32;
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104 area.h = 32;
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105 if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
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106 SDL_FillRect(screen, &area, 0xFFFF);
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107 } else {
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108 SDL_FillRect(screen, &area, 0x0000);
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109 }
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110 SDL_UpdateRects(screen, 1, &area);
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111 }
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112
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113 /* Erase previous axes */
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114 SDL_FillRect(screen, &axis_area[draw], 0x0000);
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115
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116 /* Draw the X/Y axis */
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117 draw = !draw;
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118 x = (((int)SDL_JoystickGetAxis(joystick, 0))+32768);
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119 x *= SCREEN_WIDTH;
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120 x /= 65535;
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121 if ( x < 0 ) {
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122 x = 0;
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123 } else
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124 if ( x > (SCREEN_WIDTH-16) ) {
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125 x = SCREEN_WIDTH-16;
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126 }
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127 y = (((int)SDL_JoystickGetAxis(joystick, 1))+32768);
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128 y *= SCREEN_HEIGHT;
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129 y /= 65535;
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130 if ( y < 0 ) {
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131 y = 0;
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132 } else
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133 if ( y > (SCREEN_HEIGHT-16) ) {
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134 y = SCREEN_HEIGHT-16;
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135 }
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136 axis_area[draw].x = (Sint16)x;
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137 axis_area[draw].y = (Sint16)y;
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138 axis_area[draw].w = 16;
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139 axis_area[draw].h = 16;
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140 SDL_FillRect(screen, &axis_area[draw], 0xFFFF);
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141
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142 SDL_UpdateRects(screen, 2, axis_area);
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143 }
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144 }
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145
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146 int main(int argc, char *argv[])
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147 {
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148 const char *name;
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149 int i;
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150 SDL_Joystick *joystick;
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151
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152 /* Initialize SDL (Note: video is required to start event loop) */
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153 if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK) < 0 ) {
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154 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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155 exit(1);
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156 }
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157
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158 /* Print information about the joysticks */
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159 printf("There are %d joysticks attached\n", SDL_NumJoysticks());
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160 for ( i=0; i<SDL_NumJoysticks(); ++i ) {
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161 name = SDL_JoystickName(i);
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162 printf("Joystick %d: %s\n",i,name ? name : "Unknown Joystick");
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163 }
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164
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165 if ( argv[1] ) {
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166 joystick = SDL_JoystickOpen(atoi(argv[1]));
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167 if ( joystick == NULL ) {
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168 printf("Couldn't open joystick %d: %s\n", atoi(argv[1]),
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169 SDL_GetError());
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170 } else {
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171 WatchJoystick(joystick);
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172 SDL_JoystickClose(joystick);
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173 }
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174 }
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175 SDL_QuitSubSystem(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK);
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176
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177 return(0);
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178 }
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