annotate test/testjoystick.c @ 1662:782fd950bd46 SDL-1.3

Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 281d3f4870e5
children 4da1ee79c9af
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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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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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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),
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37 SDL_JoystickNumButtons (joystick));
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38
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39 /* Initialize drawing rectangles */
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40 memset (axis_area, 0, (sizeof axis_area));
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41 draw = 0;
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42
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43 /* Loop, getting joystick events! */
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44 done = 0;
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45 while (!done) {
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46 while (SDL_PollEvent (&event)) {
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47 switch (event.type) {
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48 case SDL_JOYAXISMOTION:
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49 printf ("Joystick %d axis %d value: %d\n",
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50 event.jaxis.which,
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51 event.jaxis.axis, event.jaxis.value);
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52 break;
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53 case SDL_JOYHATMOTION:
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54 printf ("Joystick %d hat %d value:",
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55 event.jhat.which, 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, event.jball.xrel, event.jball.yrel);
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72 break;
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73 case SDL_JOYBUTTONDOWN:
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74 printf ("Joystick %d button %d down\n",
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75 event.jbutton.which, event.jbutton.button);
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76 break;
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77 case SDL_JOYBUTTONUP:
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78 printf ("Joystick %d button %d up\n",
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79 event.jbutton.which, event.jbutton.button);
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80 break;
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81 case SDL_KEYDOWN:
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82 if (event.key.keysym.sym != SDLK_ESCAPE) {
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83 break;
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84 }
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85 /* Fall through to signal quit */
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86 case SDL_QUIT:
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87 done = 1;
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88 break;
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89 default:
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90 break;
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91 }
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92 }
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93 /* Update visual joystick state */
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94 for (i = 0; i < SDL_JoystickNumButtons (joystick); ++i) {
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95 SDL_Rect area;
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96
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97 area.x = i * 34;
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98 area.y = SCREEN_HEIGHT - 34;
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99 area.w = 32;
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100 area.h = 32;
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101 if (SDL_JoystickGetButton (joystick, i) == SDL_PRESSED) {
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102 SDL_FillRect (screen, &area, 0xFFFF);
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103 } else {
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104 SDL_FillRect (screen, &area, 0x0000);
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105 }
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106 SDL_UpdateRects (screen, 1, &area);
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107 }
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108
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109 for (i = 0;
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110 i < SDL_JoystickNumAxes (joystick) / 2
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111 && i < SDL_arraysize (axis_area); ++i) {
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112 /* Erase previous axes */
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113 SDL_FillRect (screen, &axis_area[i][draw], 0x0000);
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114
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115 /* Draw the X/Y axis */
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116 draw = !draw;
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117 x = (((int) SDL_JoystickGetAxis (joystick, i * 2 + 0)) + 32768);
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118 x *= SCREEN_WIDTH;
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119 x /= 65535;
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120 if (x < 0) {
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121 x = 0;
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122 } else if (x > (SCREEN_WIDTH - 16)) {
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123 x = SCREEN_WIDTH - 16;
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124 }
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125 y = (((int) SDL_JoystickGetAxis (joystick, i * 2 + 1)) + 32768);
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126 y *= SCREEN_HEIGHT;
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127 y /= 65535;
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128 if (y < 0) {
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129 y = 0;
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130 } else if (y > (SCREEN_HEIGHT - 16)) {
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131 y = SCREEN_HEIGHT - 16;
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132 }
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133 axis_area[i][draw].x = (Sint16) x;
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134 axis_area[i][draw].y = (Sint16) y;
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135 axis_area[i][draw].w = 16;
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136 axis_area[i][draw].h = 16;
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137 SDL_FillRect (screen, &axis_area[i][draw], 0xFFFF);
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138
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139 SDL_UpdateRects (screen, 2, axis_area[i]);
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140 }
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141 }
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142 }
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143
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144 int
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145 main (int argc, char *argv[])
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146 {
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147 const char *name;
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148 int i;
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149 SDL_Joystick *joystick;
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150
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151 /* Initialize SDL (Note: video is required to start event loop) */
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152 if (SDL_Init (SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) < 0) {
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153 fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
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154 exit (1);
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155 }
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156
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157 /* Print information about the joysticks */
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158 printf ("There are %d joysticks attached\n", SDL_NumJoysticks ());
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159 for (i = 0; i < SDL_NumJoysticks (); ++i) {
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160 name = SDL_JoystickName (i);
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161 printf ("Joystick %d: %s\n", i, name ? name : "Unknown Joystick");
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162 }
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163
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164 if (argv[1]) {
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165 joystick = SDL_JoystickOpen (atoi (argv[1]));
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166 if (joystick == NULL) {
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167 printf ("Couldn't open joystick %d: %s\n", atoi (argv[1]),
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168 SDL_GetError ());
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169 } else {
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170 WatchJoystick (joystick);
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171 SDL_JoystickClose (joystick);
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172 }
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173 }
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174 SDL_QuitSubSystem (SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);
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175
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176 return (0);
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177 }