geometry.c

   1 /*******************************************************************************
   2 **3456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
   3 **      10        20        30        40        50        60        70        80
   4 **
   5 ** file:
   6 **    geometry.c
   7 **
   8 ** author:
   9 **    Mirco "MacSlow" Mueller <macslow@bangang.de>
  10 **
  11 ** copyright (C) Mirco Mueller, 2006/2007, placed under the terms of the GPL
  12 **
  13 *******************************************************************************/
  14
  15 #include "geometry.h"
  16
  17 void
  18 advance (Point* pPoint)
  19 {
  20         if (pPoint == NULL)
  21                 return;
  22
  23         if (pPoint->bGrowX)
  24         {
  25                 if (pPoint->fX + pPoint->fStepX < pPoint->fUpperLimitX)
  26                         pPoint->fX += pPoint->fStepX;
  27                 else
  28                 {
  29                         pPoint->bGrowX = FALSE;
  30                         pPoint->fX -= pPoint->fStepX;
  31                 }
  32         }
  33         else
  34         {
  35                 if (pPoint->fX - pPoint->fStepX > pPoint->fLowerLimitX)
  36                         pPoint->fX -= pPoint->fStepX;
  37                 else
  38                 {
  39                         pPoint->bGrowX = TRUE;
  40                         pPoint->fX += pPoint->fStepX;
  41                 }
  42         }
  43
  44         if (pPoint->bGrowY)
  45         {
  46                 if (pPoint->fY + pPoint->fStepY < pPoint->fUpperLimitY)
  47                         pPoint->fY += pPoint->fStepY;
  48                 else
  49                 {
  50                         pPoint->bGrowY = FALSE;
  51                         pPoint->fY -= pPoint->fStepY;
  52                 }
  53         }
  54         else
  55         {
  56                 if (pPoint->fY - pPoint->fStepY > pPoint->fLowerLimitY)
  57                         pPoint->fY -= pPoint->fStepY;
  58                 else
  59                 {
  60                         pPoint->bGrowY = TRUE;
  61                         pPoint->fY += pPoint->fStepY;
  62                 }
  63         }
  64 }
  65