bucky.c

   1 /**
   2  * @file bucky.c
   3  * @brief The buckyball-ish 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 "bucky.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
  30 /**
  31  * Special predefined values for drawing buckyballs.
  32  */
  33 static GLfloat coords[60][3] = {
  34 {-0.449358f,0.730026f,0.514918f},
  35 {-0.277718f,0.201774f,0.939234f},
  36 {-0.277718f,-0.201774f,0.939234f},
  37 {-0.555436f,0.403548f,0.727076f},
  38 {-0.555436f,-0.403548f,0.727076f},
  39 {-0.833155f,0.201774f,0.514918f},
  40 {-0.833155f,-0.201774f,0.514918f},
  41 {0.106079f,-0.326477f,0.939234f},
  42 {0.212158f,-0.652955f,0.727076f},
  43 {-0.449358f,-0.730026f,0.514918f},
  44 {-0.065560f,-0.854729f,0.514918f},
  45 {0.343279f,0.000000f,0.939234f},
  46 {0.686557f,0.000000f,0.727076f},
  47 {0.555436f,-0.652955f,0.514918f},
  48 {0.792636f,-0.326477f,0.514918f},
  49 {0.661515f,0.730026f,-0.171639f},
  50 {0.898715f,0.403548f,-0.171639f},
  51 {0.489876f,0.854729f,0.171639f},
  52 {0.964275f,0.201774f,0.171639f},
  53 {0.555436f,0.652955f,0.514918f},
  54 {0.792636f,0.326477f,0.514918f},
  55 {-0.489876f,0.854729f,-0.171639f},
  56 {-0.106079f,0.979432f,-0.171639f},
  57 {-0.661515f,0.730026f,0.171639f},
  58 {0.106079f,0.979432f,0.171639f},
  59 {-0.065560f,0.854729f,0.514918f},
  60 {-0.964275f,-0.201774f,-0.171639f},
  61 {-0.964275f,0.201774f,-0.171639f},
  62 {-0.898715f,-0.403548f,0.171639f},
  63 {-0.898715f,0.403548f,0.171639f},
  64 {-0.106079f,-0.979432f,-0.171639f},
  65 {-0.489876f,-0.854729f,-0.171639f},
  66 {0.106079f,-0.979432f,0.171639f},
  67 {-0.661515f,-0.730026f,0.171639f},
  68 {0.898715f,-0.403548f,-0.171639f},
  69 {0.661515f,-0.730026f,-0.171639f},
  70 {0.964275f,-0.201774f,0.171639f},
  71 {0.489876f,-0.854729f,0.171639f},
  72 {0.065560f,0.854729f,-0.514918f},
  73 {0.449358f,0.730026f,-0.514918f},
  74 {-0.792636f,0.326477f,-0.514918f},
  75 {-0.555436f,0.652955f,-0.514918f},
  76 {-0.555436f,-0.652955f,-0.514918f},
  77 {-0.792636f,-0.326477f,-0.514918f},
  78 {0.449358f,-0.730026f,-0.514918f},
  79 {0.065560f,-0.854729f,-0.514918f},
  80 {0.833155f,0.201774f,-0.514918f},
  81 {0.833155f,-0.201774f,-0.514918f},
  82 {0.277718f,0.201774f,-0.939234f},
  83 {-0.106079f,0.326477f,-0.939234f},
  84 {0.555436f,0.403548f,-0.727076f},
  85 {-0.212158f,0.652955f,-0.727076f},
  86 {-0.343279f,0.000000f,-0.939234f},
  87 {-0.686557f,0.000000f,-0.727076f},
  88 {-0.106079f,-0.326477f,-0.939234f},
  89 {-0.212158f,-0.652955f,-0.727076f},
  90 {0.277718f,-0.201774f,-0.939234f},
  91 {0.555436f,-0.403548f,-0.727076f},
  92 {0.106079f,0.326477f,0.939234f},
  93 {0.212158f,0.652955f,0.727076f}
  94 };
  95
  96 /**
  97  * Special adjustment value.  Only used to draw buckyballs.
  98  */
  99 static float buckyfix;
 100
 101 /**
 102  * Generates an OpenGL 1.1 vertex from an index into the bucky coord table.
 103  * Only used to draw buckyballs.
 104  */
 105 static void point(int n)
 106 {
 107         glVertex3f(coords[n][0]*buckyfix,coords[n][1]*buckyfix,coords[n][2]*buckyfix);
 108 }
 109
 110 /**
 111  * Calculates the normal of a plane defined by three points?  Only used to draw
 112  * buckyballs.
 113  */
 114 static void norm(int p1,int p2,int p3)
 115 {
 116 float nx,ny,nz;
 117 float x1,y1,z1;
 118 float x2,y2,z2;
 119
 120         x1=coords[p2][0]-coords[p1][0];
 121         y1=coords[p2][1]-coords[p1][1];
 122         z1=coords[p2][2]-coords[p1][2];
 123
 124         x2=coords[p3][0]-coords[p1][0];
 125         y2=coords[p3][1]-coords[p1][1];
 126         z2=coords[p3][2]-coords[p1][2];
 127
 128         nx=y1*z2-y2*z1;
 129         ny=x2*z1-x1*z2;
 130         nz=x1*y2-x2*y1;
 131         glNormal3f(nx,ny,nz);
 132
 133 }
 134
 135 /**
 136  * Draws a hexagon defined by 6 points.  Only used to draw buckyballs.
 137  */
 138 static void hex(int p1,int p2,int p3,int p4,int p5,int p6)
 139 {
 140         norm(p1,p3,p2);
 141         glPolygonMode(GL_FRONT,GL_FILL);
 142         glBegin(GL_POLYGON);
 143         point(p6);
 144         point(p5);
 145         point(p4);
 146         point(p3);
 147         point(p2);
 148         point(p1);
 149         glEnd();
 150         glPolygonMode(GL_FRONT,GL_FILL);
 151 }
 152
 153 /**
 154  * Draws a pentagon defined by 5 points.  Only used to draw buckyballs.
 155  */
 156 static void pent(int p1,int p2,int p3,int p4,int p5)
 157 {
 158         glBegin(GL_TRIANGLE_STRIP);
 159         norm(p1,p3,p2);
 160         point(p1);
 161         point(p5);
 162         point(p2);
 163         point(p4);
 164         point(p3);
 165         glEnd();
 166 }
 167
 168 /**
 169  * Draws a buckyball-ish (a buckyball is 60-sided, this baby is 32-sided).
 170  */
 171 void makebucky(float size)
 172 {
 173         buckyfix=size;
 174
 175         glEnable(GL_NORMALIZE);
 176         glDisable(GL_TEXTURE_2D);
 177
 178         hex(2,7,8,10,9,4);
 179         hex(1,2,4,6,5,3);
 180         hex(7,11,12,14,13,8);
 181         hex(9,10,32,30,31,33);
 182         hex(5,6,28,26,27,29);
 183         hex(0,25,59,58,1,3);
 184         hex(11,58,59,19,20,12);
 185         hex(21,22,24,25,00,23);
 186         hex(30,32,37,35,44,45);
 187         hex(26,28,33,31,42,43);
 188         hex(15,17,24,22,38,39);
 189         hex(15,16,18,20,19,17);
 190         hex(38,51,49,48,50,39);
 191         hex(13,14,36,34,35,37);
 192         hex(16,46,47,34,36,18);
 193         hex(21,23,29,27,40,41);
 194         hex(40,53,52,49,51,41);
 195         hex(44,57,56,54,55,45);
 196         hex(46,50,48,56,57,47);
 197         hex(42,55,54,52,53,43);
 198
 199
 200
 201         pent(1,58,11,7,2);
 202         pent(8,13,37,32,10);
 203         pent(4,9,33,28,6);
 204         pent(0,3,5,29,23);
 205         pent(17,19,59,25,24);
 206         pent(12,20,18,36,14);
 207         pent(30,45,55,42,31);
 208         pent(21,41,51,38,22);
 209         pent(48,49,52,54,56);
 210         pent(15,39,50,46,16);
 211         pent(34,47,57,44,35);
 212         pent(26,43,53,40,27);
 213 }
 214
 215