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