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1 | // Copyright (C) 2006 Erik Dahlberg |
2 | // |
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3 | // This file is part of LSystem3D. |
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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 <cmath> |
23 | |
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24 | #include <string> |
25 | |
26 | #include "lindenmayersystem.h" |
27 | #include "model.h" |
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28 | #include "rule.h" |
29 | #include "ruleset.h" |
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30 | #include "turtle.h" |
31 | |
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32 | using namespace std; |
33 | |
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34 | |
35 | |
36 | /** |
37 | * Constructor |
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38 | * @param model empty model |
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39 | */ |
40 | LindenmayerSystem::LindenmayerSystem(Model *model) |
41 | { |
42 | _model = model; |
43 | _turtle = new Turtle(model); |
44 | |
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45 | clear(); |
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46 | } |
47 | |
48 | |
49 | |
50 | /** |
51 | * Destructor |
52 | */ |
53 | LindenmayerSystem::~LindenmayerSystem() |
54 | { |
55 | delete _turtle; |
56 | } |
57 | |
58 | |
59 | |
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60 | /** |
61 | * Clear all parameters |
62 | */ |
63 | void LindenmayerSystem::clear() |
64 | { |
65 | _axiom.clear(); |
66 | _rules.clear(); |
67 | _turtle->setAngle(0.0); |
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68 | _depth = 0; |
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69 | |
70 | _turtle->reset(); |
71 | _model->clear(); |
72 | } |
73 | |
74 | |
75 | |
76 | /** |
77 | * Generate L-system data |
78 | */ |
79 | void LindenmayerSystem::generate() |
80 | { |
81 | // model session |
82 | _model->begin(); |
83 | _model->setColorIndex(0); |
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84 | recursiveWalk(_axiom.getPreprocessedContent(), _depth); |
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85 | _model->end(); |
86 | } |
87 | |
88 | |
89 | |
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90 | /** |
91 | * Render L-system data |
92 | */ |
93 | void LindenmayerSystem::render() |
94 | { |
95 | _model->draw(); |
96 | } |
97 | |
98 | |
99 | |
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100 | /** |
101 | * Set the initial rule (the axiom) |
102 | * @param axiom the axiom |
103 | */ |
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104 | void LindenmayerSystem::setAxiom(Rule axiom) |
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105 | { |
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106 | _axiom = axiom; |
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107 | } |
108 | |
109 | |
110 | |
111 | /** |
112 | * Set one rule |
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113 | * @param rule the rule |
114 | */ |
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115 | void LindenmayerSystem::setRule(Rule rule) |
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116 | { |
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117 | _rules.addRule(rule); |
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118 | } |
119 | |
120 | |
121 | |
122 | /** |
123 | * Set the turn/pitch/roll angle |
124 | * @param degrees the angle, in degrees |
125 | */ |
126 | void LindenmayerSystem::setAngle(double degrees) |
127 | { |
128 | // convert from degrees to radians |
129 | double radians = (degrees / 360.0) * (2.0 * M_PIl); |
130 | |
131 | _turtle->setAngle(radians); |
132 | } |
133 | |
134 | |
135 | |
136 | /** |
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137 | * Set recursion depth |
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138 | * @param depth depth of recursion |
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139 | */ |
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140 | void LindenmayerSystem::setDepth(int depth) |
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141 | { |
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142 | _depth = depth; |
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143 | } |
144 | |
145 | |
146 | |
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147 | /** |
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148 | * Set initial segment diameter |
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149 | * @param diameter the diameter |
150 | */ |
151 | void LindenmayerSystem::setDiameter(double diameter) |
152 | { |
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153 | _segmentDiameter = diameter; |
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154 | _model->setDiameter(diameter); |
155 | } |
156 | |
157 | |
158 | |
159 | /** |
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160 | * Set segment diameter factor |
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161 | * @param diameterFactor the diameter factor |
162 | */ |
163 | void LindenmayerSystem::setDiameterFactor(double diameterFactor) |
164 | { |
165 | _model->setDiameterFactor(diameterFactor); |
166 | } |
167 | |
168 | |
169 | |
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170 | /** |
171 | * Get the initial rule (the axiom) |
172 | * @return the axiom |
173 | */ |
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174 | Rule LindenmayerSystem::getAxiom() |
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175 | { |
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176 | return _axiom; |
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177 | } |
178 | |
179 | |
180 | |
181 | /** |
182 | * Get all rules |
183 | * @return the rules |
184 | */ |
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185 | RuleSet LindenmayerSystem::getRules() |
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186 | { |
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187 | return _rules; |
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188 | } |
189 | |
190 | |
191 | |
192 | /** |
193 | * Get the turn/pitch/roll angle |
194 | * @return the angle, in degrees |
195 | */ |
196 | double LindenmayerSystem::getAngle() |
197 | { |
198 | double radians = _turtle->getAngle(); |
199 | |
200 | // convert from radians to degrees |
201 | double degrees = 360.0 * (radians / (2.0 * M_PIl)); |
202 | |
203 | return degrees; |
204 | } |
205 | |
206 | |
207 | |
208 | /** |
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209 | * Get recursion depth |
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210 | * @return depth of recursion |
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211 | */ |
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212 | int LindenmayerSystem::getDepth() |
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213 | { |
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214 | return _depth; |
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215 | } |
216 | |
217 | |
218 | |
219 | /** |
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220 | * Get initial segment diameter |
221 | * @return the diameter |
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222 | */ |
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223 | double LindenmayerSystem::getDiameter() |
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224 | { |
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225 | return _segmentDiameter; |
226 | } |
227 | |
228 | |
229 | |
230 | /** |
231 | * Get segment diameter factor |
232 | * @return the diameter factor |
233 | */ |
234 | double LindenmayerSystem::getDiameterFactor() |
235 | { |
236 | return _model->getDiameterFactor(); |
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237 | } |
238 | |
239 | |
240 | |
241 | /** |
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242 | * Recursively apply the replacement rules |
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243 | * @param rule the rule |
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244 | * @param level recursion level |
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245 | */ |
246 | void LindenmayerSystem::recursiveWalk(string rule, int level) |
247 | { |
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248 | // process every element in the rule string |
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249 | for (int i = 0; i < rule.size(); i++) |
250 | { |
251 | switch (rule[i]) |
252 | { |
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253 | // rule |
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254 | case '@': |
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255 | |
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256 | // ignore marker, i.e. the "@" |
257 | i++; |
258 | |
259 | // recursion |
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260 | if (level > 0) |
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261 | { |
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262 | string name = rule.substr(i, 1); |
263 | recursiveWalk(_rules.findRule(name).getPreprocessedContent(), level - 1); |
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264 | } |
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265 | |
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266 | break; |
267 | |
268 | |
269 | // walk / rule |
270 | case 'F': |
271 | |
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272 | { |
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273 | // replacement rule for 'F'? |
274 | Rule rule = _rules.findRule("F"); |
275 | if (rule.getProbability() != 0.0 && level > 0) |
276 | { |
277 | recursiveWalk(rule.getPreprocessedContent(), level - 1); |
278 | } |
279 | else |
280 | { |
281 | // no rule for "F" |
282 | _turtle->walk(); |
283 | } |
284 | } |
285 | |
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286 | break; |
287 | |
288 | |
289 | // turn left |
290 | case '+': |
291 | |
292 | _turtle->turnLeft(); |
293 | break; |
294 | |
295 | |
296 | // turn right |
297 | case '-': |
298 | |
299 | _turtle->turnRight(); |
300 | break; |
301 | |
302 | |
303 | // pitch down |
304 | case '&': |
305 | |
306 | _turtle->pitchDown(); |
307 | break; |
308 | |
309 | |
310 | // pitch up |
311 | case '^': |
312 | |
313 | _turtle->pitchUp(); |
314 | break; |
315 | |
316 | |
317 | // roll left |
318 | case '\\': |
319 | |
320 | _turtle->rollLeft(); |
321 | break; |
322 | |
323 | |
324 | // roll right |
325 | case '/': |
326 | |
327 | _turtle->rollRight(); |
328 | break; |
329 | |
330 | |
331 | // turn around 180 degrees |
332 | case '|': |
333 | |
334 | _turtle->turnAround(); |
335 | break; |
336 | |
337 | |
338 | // save state to stack |
339 | case '[': |
340 | |
341 | _turtle->push(); |
342 | break; |
343 | |
344 | |
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345 | // load state from stack |
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346 | case ']': |
347 | |
348 | _turtle->pop(); |
349 | break; |
350 | |
351 | |
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352 | // create a filled surface |
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353 | case '{': |
354 | |
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355 | _model->fillBegin(); |
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356 | break; |
357 | |
358 | |
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359 | // close a filled surface |
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360 | case '}': |
361 | |
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362 | _model->fillEnd(); |
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363 | break; |
364 | |
365 | |
366 | // one vertex in a filled surface |
367 | case 'f': |
368 | |
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369 | _turtle->fillWalk(); |
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370 | break; |
371 | |
372 | |
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373 | // decrement segment diameter |
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374 | case '!': |
375 | |
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376 | _model->decrementDiameter(); |
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377 | break; |
378 | |
379 | |
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380 | // increment current index to color table |
381 | case '\'': |
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382 | |
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383 | _model->nextColor(); |
384 | break; |
385 | |
386 | |
387 | // decrement current index to color table |
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388 | case ',': |
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389 | |
390 | _model->prevColor(); |
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391 | break; |
392 | } |
393 | } |
394 | } |