src/rrts.cc

   1 #include <algorithm>
   2 #include "rrts.h"
   3
   4 #include "reeds_shepp.h"
   5
   6 template <typename T> int sgn(T val) {
   7         return (T(0) < val) - (val < T(0));
   8 }
   9
  10 RRTNode::RRTNode()
  11 {
  12 }
  13
  14 RRTNode::RRTNode(const BicycleCar &bc) : BicycleCar(bc)
  15 {
  16 }
  17
  18 Obstacle::Obstacle()
  19 {
  20 }
  21
  22 double RRTS::elapsed()
  23 {
  24         std::chrono::duration<double> dt;
  25         dt = std::chrono::duration_cast<std::chrono::duration<double>>(
  26                 std::chrono::high_resolution_clock::now()
  27                 - this->tstart_
  28         );
  29         this->scnt_ = dt.count();
  30         return this->scnt_;
  31 }
  32
  33 bool RRTS::should_stop()
  34 {
  35         // the following counters must be updated, do not comment
  36         this->icnt_++;
  37         this->elapsed();
  38         // current iteration stop conditions
  39         if (this->should_finish()) return true;
  40         if (this->should_break()) return true;
  41         // but continue by default
  42         return false;
  43 }
  44
  45 bool RRTS::should_finish()
  46 {
  47         // decide finish conditions (maybe comment some lines)
  48         //if (this->icnt_ > 999) return true;
  49         if (this->scnt_ > 50) return true;
  50         if (this->gf()) return true;
  51         // but continue by default
  52         return false;
  53 }
  54
  55 bool RRTS::should_break()
  56 {
  57         // decide break conditions (maybe comment some lines)
  58         //if (this->scnt_ - this->pcnt_ > 2) return true;
  59         // but continue by default
  60         return false;
  61 }
  62
  63 bool RRTS::should_continue()
  64 {
  65         // decide the stop conditions (maybe comment some lines)
  66         // it is exact opposite of `should_stop`
  67         //if (this->icnt_ > 999) return false;
  68         if (this->scnt_ > 10) return false;
  69         if (this->gf()) return false;
  70         // and reset pause counter if should continue
  71         this->pcnt_ = this->scnt_;
  72         return true;
  73 }
  74
  75 void RRTS::store_node(RRTNode n)
  76 {
  77         this->nodes().push_back(n);
  78 }
  79
  80 // RRT procedures
  81 std::tuple<bool, unsigned int, unsigned int>
  82 RRTS::collide(std::vector<std::tuple<double, double>> &poly)
  83 {
  84         for (auto &o: this->obstacles())
  85                 if (std::get<0>(::collide(poly, o.poly())))
  86                         return ::collide(poly, o.poly());
  87         return std::make_tuple(false, 0, 0);
  88 }
  89
  90 std::tuple<bool, unsigned int, unsigned int>
  91 RRTS::collide_steered_from(RRTNode &f)
  92 {
  93         std::vector<std::tuple<double, double>> s;
  94         s.push_back(std::make_tuple(f.x(), f.y()));
  95         for (auto &n: this->steered()) {
  96                 s.push_back(std::make_tuple(n.lfx(), n.lfy()));
  97                 s.push_back(std::make_tuple(n.lrx(), n.lry()));
  98                 s.push_back(std::make_tuple(n.rrx(), n.rry()));
  99                 s.push_back(std::make_tuple(n.rfx(), n.rfy()));
 100         }
 101         auto col = this->collide(s);
 102         auto strip_from = this->steered().size() - std::get<1>(col) / 4;
 103         if (std::get<0>(col) && strip_from > 0) {
 104                 while (strip_from-- > 0) {
 105                         this->steered().pop_back();
 106                 }
 107                 return this->collide_steered_from(f);
 108         }
 109         return col;
 110 }
 111
 112 std::tuple<bool, unsigned int, unsigned int>
 113 RRTS::collide_two_nodes(RRTNode &f, RRTNode &t)
 114 {
 115         std::vector<std::tuple<double, double>> p;
 116         p.push_back(std::make_tuple(f.lfx(), f.lfy()));
 117         p.push_back(std::make_tuple(f.lrx(), f.lry()));
 118         p.push_back(std::make_tuple(f.rrx(), f.rry()));
 119         p.push_back(std::make_tuple(f.rfx(), f.rfy()));
 120         p.push_back(std::make_tuple(t.lfx(), t.lfy()));
 121         p.push_back(std::make_tuple(t.lrx(), t.lry()));
 122         p.push_back(std::make_tuple(t.rrx(), t.rry()));
 123         p.push_back(std::make_tuple(t.rfx(), t.rfy()));
 124         return this->collide(p);
 125 }
 126
 127 double RRTS::cost_build(RRTNode &f, RRTNode &t)
 128 {
 129         double cost = 0;
 130         cost = sqrt(pow(t.y() - f.y(), 2) + pow(t.x() - f.x(), 2));
 131         return cost;
 132 }
 133
 134 double RRTS::cost_search(RRTNode &f, RRTNode &t)
 135 {
 136         double cost = 0;
 137         cost = sqrt(pow(t.y() - f.y(), 2) + pow(t.x() - f.x(), 2));
 138         return cost;
 139 }
 140
 141 void RRTS::sample()
 142 {
 143         double x = 0;
 144         double y = 0;
 145         double h = 0;
 146         switch (this->sample_dist_type()) {
 147         case 1:
 148                 x = this->udx_(this->gen_);
 149                 y = this->udy_(this->gen_);
 150                 h = this->udh_(this->gen_);
 151                 break;
 152         default:
 153                 x = this->ndx_(this->gen_);
 154                 y = this->ndy_(this->gen_);
 155                 h = this->ndh_(this->gen_);
 156         }
 157         this->samples().push_back(RRTNode());
 158         this->samples().back().x(x);
 159         this->samples().back().y(y);
 160         this->samples().back().h(h);
 161 }
 162
 163 RRTNode *RRTS::nn(RRTNode &t)
 164 {
 165         RRTNode *nn = &this->nodes().front();
 166         double cost = this->cost_search(*nn, t);
 167         for (auto &f: this->nodes()) {
 168                 if (this->cost_search(f, t) < cost) {
 169                         nn = &f;
 170                         cost = this->cost_search(f, t);
 171                 }
 172         }
 173         return nn;
 174 }
 175
 176 std::vector<RRTNode *> RRTS::nv(RRTNode &t)
 177 {
 178         std::vector<RRTNode *> nv;
 179         double cost = std::min(GAMMA(this->nodes().size()), ETA);
 180         for (auto &f: this->nodes())
 181                 if (this->cost_search(f, t) < cost)
 182                         nv.push_back(&f);
 183         return nv;
 184 }
 185
 186 int cb_rs_steer(double q[4], void *user_data)
 187 {
 188         std::vector<RRTNode> *nodes = (std::vector<RRTNode> *) user_data;
 189         RRTNode *ln = nullptr;
 190         if (nodes->size() > 0)
 191                 ln = &nodes->back();
 192         nodes->push_back(RRTNode());
 193         nodes->back().x(q[0]);
 194         nodes->back().y(q[1]);
 195         nodes->back().h(q[2]);
 196         nodes->back().sp(q[3]);
 197         if (nodes->back().sp() == 0)
 198                 nodes->back().set_t(RRTNodeType::cusp);
 199         else if (ln != nullptr && sgn(ln->sp()) != sgn(nodes->back().sp()))
 200                 ln->set_t(RRTNodeType::cusp);
 201         return 0;
 202 }
 203
 204 void RRTS::steer(RRTNode &f, RRTNode &t)
 205 {
 206         this->steered().clear();
 207         double q0[] = {f.x(), f.y(), f.h()};
 208         double q1[] = {t.x(), t.y(), t.h()};
 209         ReedsSheppStateSpace rsss(f.mtr());
 210         rsss.sample(q0, q1, 0.5, cb_rs_steer, &this->steered());
 211 }
 212
 213 void RRTS::join_steered(RRTNode *f)
 214 {
 215         while (this->steered().size() > 0) {
 216                 this->store_node(this->steered().front());
 217                 RRTNode *t = &this->nodes().back();
 218                 t->p(f);
 219                 t->c(this->cost_build(*f, *t));
 220                 this->steered().erase(this->steered().begin());
 221                 f = t;
 222         }
 223 }
 224
 225 bool RRTS::goal_found(RRTNode &f)
 226 {
 227         bool found = false;
 228         for (auto &g: this->goals()) {
 229                 double cost = this->cost_build(f, g);
 230                 double edist = sqrt(
 231                         pow(f.x() - g.x(), 2)
 232                         + pow(f.y() - g.y(), 2)
 233                 );
 234                 double adist = std::abs(f.h() - g.h());
 235                 if (edist < 0.05 && adist < M_PI / 32) {
 236                         found = true;
 237                         if (g.p() == nullptr || cc(f) + cost < cc(g)) {
 238                                 g.p(&f);
 239                                 g.c(cost);
 240                         }
 241                 }
 242         }
 243         return found;
 244 }
 245
 246 // RRT* procedures
 247 bool RRTS::connect()
 248 {
 249         RRTNode *t = &this->steered().front();
 250         RRTNode *f = this->nn(this->samples().back());
 251         double cost = this->cost_search(*f, *t);
 252         for (auto n: this->nv(*t)) {
 253                 if (
 254                         !std::get<0>(this->collide_two_nodes(*n, *t))
 255                         && this->cost_search(*n, *t) < cost
 256                 ) {
 257                         f = n;
 258                         cost = this->cost_search(*n, *t);
 259                 }
 260         }
 261         this->store_node(this->steered().front());
 262         t = &this->nodes().back();
 263         t->p(f);
 264         t->c(this->cost_build(*f, *t));
 265         t->set_t(RRTNodeType::connected);
 266         return true;
 267 }
 268
 269 void RRTS::rewire()
 270 {
 271         RRTNode *f = &this->nodes().back();
 272         for (auto n: this->nv(*f)) {
 273                 if (
 274                         !std::get<0>(this->collide_two_nodes(*f, *n))
 275                         && cc(*f) + this->cost_search(*f, *n) < cc(*n)
 276                 ) {
 277                         n->p(f);
 278                         n->c(this->cost_build(*f, *n));
 279                 }
 280         }
 281 }
 282
 283 // API
 284 void RRTS::init()
 285 {
 286 }
 287
 288 void RRTS::deinit()
 289 {
 290         this->nodes().clear();
 291         this->samples().clear();
 292         this->steered().clear();
 293         this->store_node(RRTNode()); // root
 294         this->icnt_ = 0;
 295         this->scnt_ = 0;
 296         this->pcnt_ = 0;
 297         this->gf_ = false;
 298 }
 299
 300 std::vector<RRTNode *> RRTS::path()
 301 {
 302         std::vector<RRTNode *> path;
 303         if (this->goals().size() == 0)
 304                 return path;
 305         RRTNode *goal = &this->goals().front();
 306         for (auto &n: this->goals()) {
 307                 if (
 308                         n.p() != nullptr
 309                         && (n.c() < goal->c() || goal->p() == nullptr)
 310                 ) {
 311                         goal = &n;
 312                 }
 313         }
 314         if (goal->p() == nullptr)
 315                 return path;
 316         while (goal != nullptr) {
 317                 path.push_back(goal);
 318                 goal = goal->p();
 319         }
 320         std::reverse(path.begin(), path.end());
 321         return path;
 322 }
 323
 324 bool RRTS::next()
 325 {
 326         if (this->icnt_ == 0)
 327                 this->tstart_ = std::chrono::high_resolution_clock::now();
 328         bool next = true;
 329         if (this->should_stop())
 330                 return false;
 331         this->sample();
 332         this->steer(
 333                 *this->nn(this->samples().back()),
 334                 this->samples().back()
 335         );
 336         if (std::get<0>(this->collide_steered_from(
 337                 *this->nn(this->samples().back())
 338         )))
 339                 return next;
 340         if (!this->connect())
 341                 return next;
 342         this->rewire();
 343         unsigned scnt = this->steered().size();
 344         this->steered().erase(this->steered().begin());
 345         this->join_steered(&this->nodes().back());
 346         RRTNode *just_added = &this->nodes().back();
 347         while (scnt > 0) {
 348                 scnt--;
 349                 for (auto &g: this->goals()) {
 350                         this->steer(*just_added, g);
 351                         if (std::get<0>(this->collide_steered_from(
 352                                 *just_added
 353                         )))
 354                                 continue;
 355                         this->join_steered(just_added);
 356                 }
 357                 this->gf(this->goal_found(this->nodes().back()));
 358                 just_added = just_added->p();
 359         }
 360         return next;
 361 }
 362
 363 void RRTS::set_sample_normal(
 364         double mx, double dx,
 365         double my, double dy,
 366         double mh, double dh
 367 )
 368 {
 369         this->ndx_ = std::normal_distribution<double>(mx, dx);
 370         this->ndy_ = std::normal_distribution<double>(my, dy);
 371         this->ndh_ = std::normal_distribution<double>(mh, dh);
 372 }
 373 void RRTS::set_sample_uniform(
 374         double xmin, double xmax,
 375         double ymin, double ymax,
 376         double hmin, double hmax
 377 )
 378 {
 379         this->udx_ = std::uniform_real_distribution<double>(xmin,xmax);
 380         this->udy_ = std::uniform_real_distribution<double>(ymin,ymax);
 381         this->udh_ = std::uniform_real_distribution<double>(hmin,hmax);
 382 }
 383 void RRTS::set_sample(
 384         double x1, double x2,
 385         double y1, double y2,
 386         double h1, double h2
 387 )
 388 {
 389         switch (this->sample_dist_type()) {
 390         case 1:
 391                 x1 += this->nodes().front().x();
 392                 x2 += this->nodes().front().x();
 393                 y1 += this->nodes().front().y();
 394                 y2 += this->nodes().front().y();
 395                 this->set_sample_uniform(x1, x2, y1, y2, h1, h2);
 396                 break;
 397         default:
 398                 this->set_sample_normal(x1, x2, y1, y2, h1, h2);
 399         }
 400 }
 401
 402 Json::Value RRTS::json()
 403 {
 404         Json::Value jvo;
 405         {
 406                 jvo["time"] = this->scnt();
 407         }
 408         {
 409                 jvo["iterations"] = this->icnt();
 410         }
 411         {
 412                 jvo["init"][0] = this->nodes().front().x();
 413                 jvo["init"][1] = this->nodes().front().y();
 414                 jvo["init"][2] = this->nodes().front().h();
 415         }
 416         {
 417                 if (this->path().size() > 0) {
 418                         jvo["cost"] = cc(*this->path().back());
 419                         jvo["goal"][0] = this->path().back()->x();
 420                         jvo["goal"][1] = this->path().back()->y();
 421                         jvo["goal"][2] = this->path().back()->h();
 422                 }
 423         }
 424         {
 425                 unsigned int cu = 0;
 426                 unsigned int co = 0;
 427                 unsigned int pcnt = 0;
 428                 for (auto n: this->path()) {
 429                         jvo["path"][pcnt][0] = n->x();
 430                         jvo["path"][pcnt][1] = n->y();
 431                         jvo["path"][pcnt][2] = n->h();
 432                         if (n->t(RRTNodeType::cusp))
 433                                 cu++;
 434                         if (n->t(RRTNodeType::connected))
 435                                 co++;
 436                         pcnt++;
 437                 }
 438                 jvo["cusps-in-path"] = cu;
 439                 jvo["connecteds-in-path"] = co;
 440         }
 441         {
 442                 unsigned int gcnt = 0;
 443                 for (auto g: this->goals()) {
 444                         jvo["goals"][gcnt][0] = g.x();
 445                         jvo["goals"][gcnt][1] = g.y();
 446                         jvo["goals"][gcnt][2] = g.h();
 447                         gcnt++;
 448                 }
 449         }
 450         {
 451                 unsigned int ocnt = 0;
 452                 for (auto o: this->obstacles()) {
 453                         unsigned int ccnt = 0;
 454                         for (auto c: o.poly()) {
 455                                 jvo["obst"][ocnt][ccnt][0] = std::get<0>(c);
 456                                 jvo["obst"][ocnt][ccnt][1] = std::get<1>(c);
 457                                 ccnt++;
 458                         }
 459                         ocnt++;
 460                 }
 461         }
 462         {
 463                 jvo["nodes"] = (unsigned int) this->nodes().size();
 464         }
 465         //{
 466         //        unsigned int ncnt = 0;
 467         //        for (auto n: this->nodes()) {
 468         //                jvo["nodes_x"][ncnt] = n.x();
 469         //                jvo["nodes_y"][ncnt] = n.y();
 470         //                //jvo["nodes_h"][ncnt] = n.h();
 471         //                ncnt++;
 472         //        }
 473         //}
 474         return jvo;
 475 }
 476
 477 void RRTS::json(Json::Value jvi)
 478 {
 479         assert(jvi["init"] != Json::nullValue);
 480         assert(jvi["goal"] != Json::nullValue);
 481         assert(jvi["goals"] != Json::nullValue);
 482         assert(jvi["obst"] != Json::nullValue);
 483
 484         this->nodes().front().x(jvi["init"][0].asDouble());
 485         this->nodes().front().y(jvi["init"][1].asDouble());
 486         this->nodes().front().h(jvi["init"][2].asDouble());
 487         {
 488                 RRTNode tmp_node;
 489                 tmp_node.x(jvi["goal"][0].asDouble());
 490                 tmp_node.y(jvi["goal"][1].asDouble());
 491                 tmp_node.h(jvi["goal"][2].asDouble());
 492                 this->goals().push_back(tmp_node);
 493                 for (auto g: jvi["goals"]) {
 494                         tmp_node.x(g[0].asDouble());
 495                         tmp_node.y(g[1].asDouble());
 496                         tmp_node.h(g[2].asDouble());
 497                         this->goals().push_back(tmp_node);
 498                 }
 499         }
 500         {
 501                 Obstacle tmp_obstacle;
 502                 for (auto o: jvi["obst"]) {
 503                         tmp_obstacle.poly().clear();
 504                         for (auto c: o) {
 505                                 double tmp_x = c[0].asDouble();
 506                                 double tmp_y = c[1].asDouble();
 507                                 auto tmp_tuple = std::make_tuple(tmp_x, tmp_y);
 508                                 tmp_obstacle.poly().push_back(tmp_tuple);
 509                         }
 510                         this->obstacles().push_back(tmp_obstacle);
 511                 }
 512         }
 513         {
 514                 double edist_init_goal = sqrt(
 515                         pow(
 516                                 this->nodes().front().x()
 517                                 - this->goals().front().x(),
 518                                 2
 519                         )
 520                         + pow(
 521                                 this->nodes().front().y()
 522                                 - this->goals().front().y(),
 523                                 2
 524                         )
 525                 );
 526                 this->set_sample(
 527                         this->nodes().front().x(), edist_init_goal,
 528                         this->nodes().front().y(), edist_init_goal,
 529                         0, 2 * M_PI
 530                 );
 531         }
 532 }
 533
 534 RRTS::RRTS()
 535         : gen_(std::random_device{}())
 536 {
 537         this->goals().reserve(100);
 538         this->nodes().reserve(4000000);
 539         this->samples().reserve(1000);
 540         this->steered().reserve(20000);
 541         this->store_node(RRTNode()); // root
 542 }
 543
 544 double cc(RRTNode &t)
 545 {
 546         RRTNode *n = &t;
 547         double cost = 0;
 548         while (n != nullptr) {
 549                 cost += n->c();
 550                 n = n->p();
 551         }
 552         return cost;
 553 }