src/CMath.cpp

   1 /*
   2 Copyright (C) 2004 Parallel Realities
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20
  21 #include "headers.h"
  22
  23 void Math::limitChar(signed char *in, int low, int high)
  24 {
  25         if (*in < low)
  26                 *in = low;
  27         if (*in > high)
  28                 *in = high;
  29 }
  30
  31 void Math::limitChar(unsigned char *in, int low, int high)
  32 {
  33         if (*in < low)
  34                 *in = low;
  35         if (*in > high)
  36                 *in = high;
  37 }
  38
  39 void Math::limitInt(int *in, int low, int high)
  40 {
  41         if (*in < low)
  42                 *in = low;
  43         if (*in > high)
  44                 *in = high;
  45 }
  46
  47 void Math::limitFloat(float *in, float low, float high)
  48 {
  49         if (*in < low)
  50                 *in = low;
  51         if (*in > high)
  52                 *in = high;
  53 }
  54
  55 void Math::wrapChar(signed char *in, signed char low, signed char high)
  56 {
  57         if (*in < low)
  58                 *in = high;
  59         if (*in > high)
  60                 *in = low;
  61 }
  62
  63 void Math::wrapInt(int *in, int low, int high)
  64 {
  65         if (*in < low)
  66                 *in = high;
  67         if (*in > high)
  68                 *in = low;
  69 }
  70
  71 void Math::wrapFloat(float *in, float low, float high)
  72 {
  73         if (*in < low)
  74                 *in = high;
  75         if (*in > high)
  76                 *in = low;
  77 }
  78
  79 int Math::prand()
  80 {
  81         pSeed = pSeed * 7654321 + 12345;
  82         pSeed = (unsigned int)(pSeed / 65536) % 32768;
  83
  84         return pSeed;
  85 }
  86
  87 int Math::rrand(int min, int max)
  88 {
  89         int r = min;
  90
  91         max++;
  92
  93         if ((max - min) == 0)
  94         {
  95                 return min;
  96         }
  97
  98         return r += prand() % (max - min);
  99 }
 100
 101 void Math::addBit(long *currentBits, long newBits)
 102 {
 103         if (!(*currentBits & newBits))
 104                 *currentBits += newBits;
 105 }
 106
 107 void Math::removeBit(long *currentBits, long oldBits)
 108 {
 109         if (*currentBits & oldBits)
 110                 *currentBits -= oldBits;
 111 }
 112
 113 void Math::calculateSlope(float x, float y, float x2, float y2, float *dx, float *dy)
 114 {
 115         int steps = (int)max(fabs(x - x2), fabs(y - y2));
 116         if (steps == 0)
 117         {
 118                 *dx = 0;
 119                 *dy = 0;
 120                 return;
 121         }
 122
 123         *dx = (x - x2);
 124         *dx /= steps;
 125         *dy = (y - y2);
 126         *dy /= steps;
 127 }
 128
 129 char *Math::formatTime(int t)
 130 {
 131         static char time[1024];
 132
 133         strcpy(time, "");
 134
 135         int hours = t / 3600;
 136         int minutes = (t % 3600) / 60;
 137         int seconds = (t % 60);
 138
 139         sprintf(time, "%dh %dm %ds", hours, minutes, seconds);
 140
 141         return time;
 142 }
 143
 144 unsigned int Math::pSeed;