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   if (read(joystick_device, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
  94   {
  95     fprintf(stderr,"%s: cannot read joystick settings - no joystick support\n",
  96             progname);
  97     joystick_status = JOYSTICK_OFF;
  98     return(0);
  99   }
 100
 101   js_x  = joy_ctrl.x;
 102   js_y  = joy_ctrl.y;
 103 #ifdef __FreeBSD__
 104   js_b1 = joy_ctrl.b1;
 105   js_b2 = joy_ctrl.b2;
 106 #else
 107   js_b1 = joy_ctrl.buttons & 1;
 108   js_b2 = joy_ctrl.buttons & 2;
 109 #endif
 110
 111   left = JoystickPosition(joystick[joystick_nr].xmiddle,
 112                           joystick[joystick_nr].xleft,  js_x);
 113   right = JoystickPosition(joystick[joystick_nr].xmiddle,
 114                            joystick[joystick_nr].xright, js_x);
 115   up =    JoystickPosition(joystick[joystick_nr].ymiddle,
 116                            joystick[joystick_nr].yupper, js_y);
 117   down =  JoystickPosition(joystick[joystick_nr].ymiddle,
 118                            joystick[joystick_nr].ylower, js_y);
 119
 120   if (left>JOYSTICK_PERCENT)
 121     result |= JOY_LEFT;
 122   else if (right>JOYSTICK_PERCENT)
 123     result |= JOY_RIGHT;
 124   if (up>JOYSTICK_PERCENT)
 125     result |= JOY_UP;
 126   else if (down>JOYSTICK_PERCENT)
 127     result |= JOY_DOWN;
 128   if (js_b1)
 129     result |= JOY_BUTTON_1;
 130   if (js_b2)
 131     result |= JOY_BUTTON_2;
 132
 133   return(result);
 134 }
 135
 136 int JoystickButton()
 137 {
 138   static int last_joy_button = 0;
 139   int joy_button = (Joystick() & JOY_BUTTON);
 140   int result;
 141
 142   if (joy_button)
 143   {
 144     if (last_joy_button)
 145       result = JOY_BUTTON_PRESSED;
 146     else
 147       result = JOY_BUTTON_NEW_PRESSED;
 148   }
 149   else
 150   {
 151     if (last_joy_button)
 152       result = JOY_BUTTON_NEW_RELEASED;
 153     else
 154       result = JOY_BUTTON_NOT_PRESSED;
 155   }
 156
 157   last_joy_button = joy_button;
 158   return(result);
 159 }