| 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 <vector> |
| 23 | |
| 24 | #include "GL/gl.h" |
| 25 | #include "GL/glu.h" |
| 26 | |
| 27 | #include "color.h" |
| 28 | #include "model.h" |
| 29 | #include "vector.h" |
| 30 | |
| 31 | using namespace std; |
| 32 | |
| 33 | |
| 34 | |
| 35 | /** |
| 36 | * Constructor |
| 37 | */ |
| 38 | Model::Model() |
| 39 | { |
| 40 | // default color table |
| 41 | Color brown(0.5, 0.2, 0.0); _colorTable.push_back(brown); |
| 42 | Color white(1.0, 1.0, 1.0); _colorTable.push_back(white); |
| 43 | Color green(0.0, 0.5, 0.0); _colorTable.push_back(green); |
| 44 | |
| 45 | _displayList = 0; |
| 46 | |
| 47 | clear(); |
| 48 | } |
| 49 | |
| 50 | |
| 51 | |
| 52 | /** |
| 53 | * Destructor |
| 54 | */ |
| 55 | Model::~Model() |
| 56 | { |
| 57 | glDeleteLists(_displayList, 1); |
| 58 | } |
| 59 | |
| 60 | |
| 61 | |
| 62 | /** |
| 63 | * Clear the model |
| 64 | */ |
| 65 | void Model::clear() |
| 66 | { |
| 67 | glDeleteLists(_displayList, 1); |
| 68 | _displayList = glGenLists(1); |
| 69 | |
| 70 | setColorIndex(0); |
| 71 | |
| 72 | _diameter = 0.1; |
| 73 | _diameterFactor = 0.8; |
| 74 | } |
| 75 | |
| 76 | |
| 77 | |
| 78 | /** |
| 79 | * Render to screen |
| 80 | */ |
| 81 | void Model::draw() |
| 82 | { |
| 83 | glCallList(_displayList); |
| 84 | } |
| 85 | |
| 86 | |
| 87 | |
| 88 | /** |
| 89 | * Create a segment |
| 90 | * @param x1 x start point |
| 91 | * @param y1 y start point |
| 92 | * @param z1 z start point |
| 93 | * @param x2 x end point |
| 94 | * @param y2 y end point |
| 95 | * @param z2 z end point |
| 96 | */ |
| 97 | void Model::segment(double x1, double y1, double z1, double x2, double y2, double z2) |
| 98 | { |
| 99 | // find rotation vector and angle |
| 100 | |
| 101 | Vector initial(0.0, 1.0, 0.0); // initial rotation of cylinder |
| 102 | Vector desired(x2-x1, y2-y1, z2-z1); // desired rotation of cylinder |
| 103 | desired.normalize(); |
| 104 | |
| 105 | // rotation angle |
| 106 | double rotationAngle = initial.getAngle(desired); |
| 107 | |
| 108 | // rotation vector |
| 109 | Vector rotationVector = initial.getCrossProduct(desired); |
| 110 | rotationVector.normalize(); |
| 111 | |
| 112 | |
| 113 | // render the cylinder |
| 114 | |
| 115 | static GLUquadric *quadric = gluNewQuadric(); |
| 116 | |
| 117 | glPushMatrix(); |
| 118 | glTranslatef(x1, y1, z1); |
| 119 | glRotatef(rotationAngle, rotationVector.getX(), rotationVector.getY(), rotationVector.getZ()); |
| 120 | glRotatef(-90, 1, 0, 0); |
| 121 | |
| 122 | gluCylinder(quadric, _diameter, _diameter, 1.0, 6, 6); |
| 123 | glPopMatrix(); |
| 124 | } |
| 125 | |
| 126 | |
| 127 | |
| 128 | /** |
| 129 | * Specify a vertex |
| 130 | * @param x x-coordinate |
| 131 | * @param y y-coordinate |
| 132 | * @param z z-coordinate |
| 133 | */ |
| 134 | void Model::vertex(double x, double y, double z) |
| 135 | { |
| 136 | glVertex3d(x, y, z); |
| 137 | } |
| 138 | |
| 139 | |
| 140 | |
| 141 | /** |
| 142 | * Specify a normal |
| 143 | * @param x x-coordinate |
| 144 | * @param y y-coordinate |
| 145 | * @param z z-coordinate |
| 146 | */ |
| 147 | void Model::normal(double x, double y, double z) |
| 148 | { |
| 149 | glNormal3f(x, y, z); |
| 150 | } |
| 151 | |
| 152 | |
| 153 | |
| 154 | /** |
| 155 | * Begin a modelling session |
| 156 | */ |
| 157 | void Model::begin() |
| 158 | { |
| 159 | glNewList(_displayList, GL_COMPILE); |
| 160 | } |
| 161 | |
| 162 | |
| 163 | |
| 164 | /** |
| 165 | * End a modelling session |
| 166 | */ |
| 167 | void Model::end() |
| 168 | { |
| 169 | glEndList(); |
| 170 | } |
| 171 | |
| 172 | |
| 173 | |
| 174 | /** |
| 175 | * Begin creation of a filled polygon |
| 176 | */ |
| 177 | void Model::fillBegin() |
| 178 | { |
| 179 | glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 1); |
| 180 | |
| 181 | glBegin(GL_POLYGON); |
| 182 | } |
| 183 | |
| 184 | |
| 185 | |
| 186 | /** |
| 187 | * End creation of a filled polygon |
| 188 | */ |
| 189 | void Model::fillEnd() |
| 190 | { |
| 191 | glEnd(); |
| 192 | |
| 193 | glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 0); |
| 194 | } |
| 195 | |
| 196 | |
| 197 | |
| 198 | /** |
| 199 | * Increment current index to color table |
| 200 | */ |
| 201 | void Model::nextColor() |
| 202 | { |
| 203 | setColorIndex(_colorIndex + 1); |
| 204 | } |
| 205 | |
| 206 | |
| 207 | |
| 208 | /** |
| 209 | * Decrement current index to color table |
| 210 | */ |
| 211 | void Model::prevColor() |
| 212 | { |
| 213 | setColorIndex(_colorIndex - 1); |
| 214 | } |
| 215 | |
| 216 | |
| 217 | |
| 218 | /** |
| 219 | * Decrement segment diameter |
| 220 | */ |
| 221 | void Model::decrementDiameter() |
| 222 | { |
| 223 | _diameter *= _diameterFactor; |
| 224 | } |
| 225 | |
| 226 | |
| 227 | |
| 228 | /** |
| 229 | * Set current color index |
| 230 | * @param index the color index |
| 231 | */ |
| 232 | void Model::setColorIndex(int index) |
| 233 | { |
| 234 | // keep in range |
| 235 | |
| 236 | if (index < 0) |
| 237 | { |
| 238 | _colorIndex = _colorTable.size() - 1; |
| 239 | } |
| 240 | else if (index > (_colorTable.size() - 1)) |
| 241 | { |
| 242 | _colorIndex = 0; |
| 243 | } |
| 244 | else |
| 245 | { |
| 246 | _colorIndex = index; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | // set color |
| 251 | |
| 252 | Color color = _colorTable[_colorIndex]; |
| 253 | double r = color.getR(); |
| 254 | double g = color.getG(); |
| 255 | double b = color.getB(); |
| 256 | |
| 257 | glColor3f(r, g, b); |
| 258 | } |
| 259 | |
| 260 | |
| 261 | |
| 262 | /** |
| 263 | * Set current segment diameter |
| 264 | * @param diameter the diameter |
| 265 | */ |
| 266 | void Model::setDiameter(double diameter) |
| 267 | { |
| 268 | _diameter = diameter; |
| 269 | } |
| 270 | |
| 271 | |
| 272 | |
| 273 | /** |
| 274 | * Set segment diameter factor |
| 275 | * @param diameter the diameter factor |
| 276 | */ |
| 277 | void Model::setDiameterFactor(double diameterFactor) |
| 278 | { |
| 279 | _diameterFactor = diameterFactor; |
| 280 | } |
| 281 | |
| 282 | |
| 283 | |
| 284 | /** |
| 285 | * Get current color index |
| 286 | * @return color index |
| 287 | */ |
| 288 | int Model::getColorIndex() |
| 289 | { |
| 290 | return _colorIndex; |
| 291 | } |
| 292 | |
| 293 | |
| 294 | |
| 295 | /** |
| 296 | * Get current segment diameter |
| 297 | * @return the diameter |
| 298 | */ |
| 299 | double Model::getDiameter() |
| 300 | { |
| 301 | return _diameter; |
| 302 | } |
| 303 | |
| 304 | |
| 305 | |
| 306 | /** |
| 307 | * Get segment diameter factor |
| 308 | * @return the diameter factor |
| 309 | */ |
| 310 | double Model::getDiameterFactor() |
| 311 | { |
| 312 | return _diameterFactor; |
| 313 | } |