cylinder.c

   1 /**
   2  * @file cylinder.c
   3  * @brief The celerey module.
   4  *
   5  * Copyright 2001, 2008 David Ashley  <dashxdr@gmail.com>
   6  * Copyright 2008 Stephen M. Webb  <stephen.webb@bregmasoft.ca>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of Version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include "cylinder.h"
  22
  23 #if defined(_WIN32) && !defined(__CYGWIN__)
  24 # define WIN32_LEAN_AND_MEAN 1
  25 # include <windows.h>
  26 #endif
  27
  28 #include <GL/gl.h>
  29 #include <math.h>
  30 #include "misc.h"
  31
  32
  33 /** Celery stalks */
  34 #define CSQUEEZE 0.8f
  35 void makecylinder(float size)
  36 {
  37 #define CSIDES 12
  38 float x[CSIDES],z[CSIDES];
  39 int i,j,k;
  40 float a;
  41         for(i=0;i<CSIDES;++i)
  42         {
  43                 a=i*PI*2.0f/CSIDES;
  44                 x[i]=cosf(a)*size*CSQUEEZE;
  45                 z[i]=sinf(a)*size*CSQUEEZE;
  46         }
  47
  48         glEnable(GL_NORMALIZE);
  49         for(j=0;j<2;++j)
  50         {
  51                 float p=(j&1) ? -size : size;
  52                 glNormal3f(0.0, p, 0.0);
  53                 glBegin(GL_POLYGON);
  54                 for(i=0;i<CSIDES;++i)
  55                 {
  56                         k=(j&1) ? i : (CSIDES-1-i);
  57                         glVertex3f(x[k],p,z[k]);
  58                 }
  59                 glEnd();
  60         }
  61         glBegin(GL_QUAD_STRIP);
  62         for(i=0;i<CSIDES+1;++i)
  63         {
  64                 j=(i<CSIDES) ? i : i-CSIDES;
  65                 if(i)
  66                         glNormal3f((x[j]+x[k])/2.0f,0.0f,(z[j]+z[k])/2.0f);
  67                 glVertex3f(x[j],-size,z[j]);
  68                 glVertex3f(x[j], size,z[j]);
  69                 k=j;
  70         }
  71         glEnd();
  72
  73 }
  74
  75
  76