src/model.cpp

   1 // Copyright (C) 2006 Erik Dahlberg
   2 //
   3 // This file is part of LSystem3d.
   4 //
   5 // LSystem3D is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU General Public License
   7 // as published by the Free Software Foundation; either version 2
   8 // of the License, or (at your option) any later version.
   9 //
  10 // LSystem3D is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with LSystem3D; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19
  20
  21
  22 #include "GL/gl.h"
  23 #include "GL/glu.h"
  24
  25 #include "model.h"
  26 #include "vector.h"
  27
  28
  29
  30 /**
  31  * Constructor
  32  */
  33 Model::Model()
  34 {
  35     _displayList = glGenLists(1);
  36 }
  37
  38
  39
  40 /**
  41  * Destructor
  42  */
  43 Model::~Model()
  44 {
  45     glDeleteLists(_displayList, 1);
  46 }
  47
  48
  49
  50 /**
  51  * Connect two points
  52  * @param diameter diameter of segment
  53  * @param x1 x start point
  54  * @param y1 y start point
  55  * @param z1 z start point
  56  * @param x2 x end point
  57  * @param y2 y end point
  58  * @param z2 z end point
  59  */
  60 void Model::segment(double diameter, double x1, double y1, double z1, double x2, double y2, double z2)
  61 {
  62     // wireframe
  63     //
  64     // glColor3f(1,1,1);
  65     // glBegin(GL_LINES);
  66     //     glVertex3d(x1, y1, z1);
  67     //     glVertex3d(x2, y2, z2);
  68     // glEnd();
  69
  70
  71
  72     // solid
  73
  74     // find rotation vector and angle of cylinder
  75
  76     Vector initial(0.0,   1.0,   0.0);      // initial rotation of cylinder
  77     Vector desired(x2-x1, y2-y1, z2-z1);    // desired rotation of cylinder
  78     desired.normalize();
  79
  80     // rotation angle
  81     double angle = initial.getAngle(desired);
  82
  83     // rotation vector
  84     Vector crossProduct = initial.getCrossProduct(desired);
  85     crossProduct.normalize();
  86
  87
  88     // render the cylinder
  89
  90     GLUquadric *quadric = gluNewQuadric();
  91
  92     glColor3f(1.0, 0.5, 0.0);
  93
  94     glPushMatrix();
  95         glTranslatef(x1, y1, z1);
  96         glRotatef(angle, crossProduct.getX(), crossProduct.getY(), crossProduct.getZ());
  97         glRotatef(-90, 1, 0, 0);
  98
  99         gluCylinder(quadric, diameter, diameter, 1.0, 6, 6);
 100     glPopMatrix();
 101 }
 102
 103
 104
 105 /**
 106  * Draw model to screen
 107  */
 108 void Model::draw()
 109 {
 110     glCallList(_displayList);
 111 }
 112
 113
 114
 115 /**
 116  * Clear the model
 117  */
 118 void Model::clear()
 119 {
 120     // TODO: not needed?
 121 }
 122
 123
 124
 125 /**
 126  * Start recording of drawing operations
 127  */
 128 void Model::begin()
 129 {
 130     glNewList(_displayList, GL_COMPILE);
 131 }
 132
 133
 134
 135 /**
 136  * Stop recording of drawing operations
 137  */
 138 void Model::end()
 139 {
 140     glEndList();
 141 }
 142
 143
 144
 145 /**
 146  * Begin creation of a filled surface
 147  */
 148 void Model::fillBegin()
 149 {
 150     glColor3f(0.0, 0.5, 0.0);
 151     glBegin(GL_POLYGON);
 152 }
 153
 154
 155
 156 /**
 157  * End creation of a filled surface
 158  */
 159 void Model::fillEnd()
 160 {
 161     glEnd();
 162 }
 163
 164
 165
 166 /**
 167  * Create one vertex in the filled surface
 168  * @param x x-coordinate
 169  * @param y y-coordinate
 170  * @param z z-coordinate
 171  */
 172 void Model::point(double x, double y, double z)
 173 {
 174     glVertex3d(x, y, z);
 175 }