src/joystick.c

   1 /***********************************************************
   2 *  Rocks'n'Diamonds -- McDuffin Strikes Back!              *
   3 *----------------------------------------------------------*
   4 *  ©1995 Artsoft Development                               *
   5 *        Holger Schemel                                    *
   6 *        33604 Bielefeld                                   *
   7 *        Telefon: (0521) 290471                            *
   8 *        eMail: aeglos@valinor.owl.de                      *
   9 *               aeglos@uni-paderborn.de                    *
  10 *----------------------------------------------------------*
  11 *  joystick.c                                              *
  12 ***********************************************************/
  13
  14 #ifdef __FreeBSD__
  15 #include <machine/joystick.h>
  16 #endif
  17
  18 #include "joystick.h"
  19
  20 /*
  21 #include "tools.h"
  22 #include "game.h"
  23 #include "events.h"
  24 #include "sound.h"
  25 #include "misc.h"
  26 #include "buttons.h"
  27 #include <math.h>
  28 */
  29
  30 void CheckJoystickData()
  31 {
  32   int i;
  33   int distance = 100;
  34
  35   for(i=0;i<2;i++)
  36   {
  37     if (joystick[i].xmiddle <= distance)
  38       joystick[i].xmiddle = distance;
  39     if (joystick[i].ymiddle <= distance)
  40       joystick[i].ymiddle = distance;
  41
  42     if (joystick[i].xleft >= joystick[i].xmiddle)
  43       joystick[i].xleft = joystick[i].xmiddle-distance;
  44     if (joystick[i].xright <= joystick[i].xmiddle)
  45       joystick[i].xright = joystick[i].xmiddle+distance;
  46
  47     if (joystick[i].yupper >= joystick[i].ymiddle)
  48       joystick[i].yupper = joystick[i].ymiddle-distance;
  49     if (joystick[i].ylower <= joystick[i].ymiddle)
  50       joystick[i].ylower = joystick[i].ymiddle+distance;
  51   }
  52 }
  53
  54 int JoystickPosition(int middle, int margin, int actual)
  55 {
  56   long range, pos;
  57   int percentage;
  58
  59   if (margin<middle && actual>middle)
  60     return(0);
  61   if (margin>middle && actual<middle)
  62     return(0);
  63
  64   range = ABS(margin-middle);
  65   pos = ABS(actual-middle);
  66   percentage = (int)(pos*100/range);
  67   if (percentage>100)
  68     percentage = 100;
  69
  70   return(percentage);
  71 }
  72
  73 int Joystick()
  74 {
  75 #ifdef __FreeBSD__
  76   struct joystick joy_ctrl;
  77 #else
  78   struct joystick_control
  79   {
  80     int buttons;
  81     int x;
  82     int y;
  83   } joy_ctrl;
  84 #endif
  85
  86   int js_x,js_y, js_b1,js_b2;
  87   int left, right, up, down;
  88   int result=0;
  89
  90   if (joystick_status==JOYSTICK_OFF)
  91     return(0);
  92
  93 #ifndef MSDOS
  94   if (read(joystick_device, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
  95   {
  96     fprintf(stderr,"%s: cannot read joystick settings - no joystick support\n",
  97             progname);
  98     joystick_status = JOYSTICK_OFF;
  99     return(0);
 100   }
 101
 102   js_x  = joy_ctrl.x;
 103   js_y  = joy_ctrl.y;
 104 #ifdef __FreeBSD__
 105   js_b1 = joy_ctrl.b1;
 106   js_b2 = joy_ctrl.b2;
 107 #else
 108   js_b1 = joy_ctrl.buttons & 1;
 109   js_b2 = joy_ctrl.buttons & 2;
 110 #endif
 111
 112   left = JoystickPosition(joystick[joystick_nr].xmiddle,
 113                           joystick[joystick_nr].xleft,  js_x);
 114   right = JoystickPosition(joystick[joystick_nr].xmiddle,
 115                            joystick[joystick_nr].xright, js_x);
 116   up =    JoystickPosition(joystick[joystick_nr].ymiddle,
 117                            joystick[joystick_nr].yupper, js_y);
 118   down =  JoystickPosition(joystick[joystick_nr].ymiddle,
 119                            joystick[joystick_nr].ylower, js_y);
 120
 121   if (left>JOYSTICK_PERCENT)
 122     result |= JOY_LEFT;
 123   else if (right>JOYSTICK_PERCENT)
 124     result |= JOY_RIGHT;
 125   if (up>JOYSTICK_PERCENT)
 126     result |= JOY_UP;
 127   else if (down>JOYSTICK_PERCENT)
 128     result |= JOY_DOWN;
 129   if (js_b1)
 130     result |= JOY_BUTTON_1;
 131   if (js_b2)
 132     result |= JOY_BUTTON_2;
 133
 134   return(result);
 135 #else
 136   return(0);
 137 #endif
 138 }
 139
 140 int JoystickButton()
 141 {
 142   static int last_joy_button = 0;
 143   int joy_button = (Joystick() & JOY_BUTTON);
 144   int result;
 145
 146   if (joy_button)
 147   {
 148     if (last_joy_button)
 149       result = JOY_BUTTON_PRESSED;
 150     else
 151       result = JOY_BUTTON_NEW_PRESSED;
 152   }
 153   else
 154   {
 155     if (last_joy_button)
 156       result = JOY_BUTTON_NEW_RELEASED;
 157     else
 158       result = JOY_BUTTON_NOT_PRESSED;
 159   }
 160
 161   last_joy_button = joy_button;
 162   return(result);
 163 }