| 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 | } |