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annotate test/testjoystick.c @ 2157:75a6c5deba84

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Fixed bug #451 SDL_memset4 copies a 32-bit value, not an 8-bit value.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 08 Jul 2007 14:24:55 +0000
parents c121d94672cb
children 893c862eed86
rev   line source
0
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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
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14 WatchJoystick(SDL_Joystick * joystick)
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15 {
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16 SDL_Surface *screen;
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17 const char *name;
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18 int i, done;
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19 SDL_Event event;
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20 int x, y, draw;
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21 SDL_Rect axis_area[6][2];
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22
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23 /* Set a video mode to display joystick axis position */
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24 screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 16, 0);
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25 if (screen == NULL) {
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26 fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());
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27 return;
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28 }
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29
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30 /* Print info about the joystick we are watching */
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31 name = SDL_JoystickName(SDL_JoystickIndex(joystick));
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32 printf("Watching joystick %d: (%s)\n", SDL_JoystickIndex(joystick),
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33 name ? name : "Unknown Joystick");
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34 printf("Joystick has %d axes, %d hats, %d balls, and %d buttons\n",
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35 SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick),
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36 SDL_JoystickNumBalls(joystick), SDL_JoystickNumButtons(joystick));
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37
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38 /* Initialize drawing rectangles */
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39 memset(axis_area, 0, (sizeof axis_area));
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40 draw = 0;
0
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41
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42 /* Loop, getting joystick events! */
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43 done = 0;
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44 while (!done) {
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45 while (SDL_PollEvent(&event)) {
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46 switch (event.type) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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47 case SDL_JOYAXISMOTION:
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48 printf("Joystick %d axis %d value: %d\n",
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49 event.jaxis.which,
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50 event.jaxis.axis, 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, event.jhat.hat);
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55 if (event.jhat.value == SDL_HAT_CENTERED)
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56 printf(" centered");
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57 if (event.jhat.value & SDL_HAT_UP)
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58 printf(" up");
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59 if (event.jhat.value & SDL_HAT_RIGHT)
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60 printf(" right");
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61 if (event.jhat.value & SDL_HAT_DOWN)
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62 printf(" down");
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63 if (event.jhat.value & SDL_HAT_LEFT)
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64 printf(" left");
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65 printf("\n");
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66 break;
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67 case SDL_JOYBALLMOTION:
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68 printf("Joystick %d ball %d delta: (%d,%d)\n",
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69 event.jball.which,
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70 event.jball.ball, event.jball.xrel, event.jball.yrel);
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71 break;
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72 case SDL_JOYBUTTONDOWN:
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73 printf("Joystick %d button %d down\n",
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74 event.jbutton.which, event.jbutton.button);
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75 break;
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76 case SDL_JOYBUTTONUP:
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77 printf("Joystick %d button %d up\n",
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78 event.jbutton.which, event.jbutton.button);
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79 break;
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80 case SDL_KEYDOWN:
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81 if (event.key.keysym.sym != SDLK_ESCAPE) {
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82 break;
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83 }
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84 /* Fall through to signal quit */
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85 case SDL_QUIT:
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86 done = 1;
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87 break;
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88 default:
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89 break;
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90 }
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91 }
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92 /* Update visual joystick state */
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93 for (i = 0; i < SDL_JoystickNumButtons(joystick); ++i) {
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94 SDL_Rect area;
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95
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96 area.x = i * 34;
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97 area.y = SCREEN_HEIGHT - 34;
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98 area.w = 32;
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99 area.h = 32;
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100 if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
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101 SDL_FillRect(screen, &area, 0xFFFF);
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102 } else {
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103 SDL_FillRect(screen, &area, 0x0000);
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104 }
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105 SDL_UpdateRects(screen, 1, &area);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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106 }
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107
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108 for (i = 0;
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109 i < SDL_JoystickNumAxes(joystick) / 2
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110 && i < SDL_arraysize(axis_area); ++i) {
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111 /* Erase previous axes */
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112 SDL_FillRect(screen, &axis_area[i][draw], 0x0000);
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113
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114 /* Draw the X/Y axis */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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115 draw = !draw;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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116 x = (((int) SDL_JoystickGetAxis(joystick, i * 2 + 0)) + 32768);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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117 x *= SCREEN_WIDTH;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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118 x /= 65535;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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119 if (x < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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120 x = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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121 } else if (x > (SCREEN_WIDTH - 16)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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122 x = SCREEN_WIDTH - 16;
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123 }
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124 y = (((int) SDL_JoystickGetAxis(joystick, i * 2 + 1)) + 32768);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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125 y *= SCREEN_HEIGHT;
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126 y /= 65535;
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127 if (y < 0) {
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128 y = 0;
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129 } else if (y > (SCREEN_HEIGHT - 16)) {
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130 y = SCREEN_HEIGHT - 16;
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131 }
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132 axis_area[i][draw].x = (Sint16) x;
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133 axis_area[i][draw].y = (Sint16) y;
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134 axis_area[i][draw].w = 16;
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135 axis_area[i][draw].h = 16;
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136 SDL_FillRect(screen, &axis_area[i][draw], 0xFFFF);
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137
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138 SDL_UpdateRects(screen, 2, axis_area[i]);
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139 }
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140 }
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141 }
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142
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143 int
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144 main(int argc, char *argv[])
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145 {
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146 const char *name;
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147 int i;
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148 SDL_Joystick *joystick;
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149
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150 /* Initialize SDL (Note: video is required to start event loop) */
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151 if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) < 0) {
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152 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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153 exit(1);
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154 }
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155
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156 /* Print information about the joysticks */
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157 printf("There are %d joysticks attached\n", SDL_NumJoysticks());
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158 for (i = 0; i < SDL_NumJoysticks(); ++i) {
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159 name = SDL_JoystickName(i);
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160 printf("Joystick %d: %s\n", i, name ? name : "Unknown Joystick");
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161 }
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162
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163 if (argv[1]) {
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164 joystick = SDL_JoystickOpen(atoi(argv[1]));
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165 if (joystick == NULL) {
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166 printf("Couldn't open joystick %d: %s\n", atoi(argv[1]),
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167 SDL_GetError());
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168 } else {
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169 WatchJoystick(joystick);
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170 SDL_JoystickClose(joystick);
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171 }
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172 }
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173 SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);
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174
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175 return (0);
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176 }