api/rrts.h

   1 #ifndef RRTS_H
   2 #define RRTS_H
   3
   4 #include <chrono>
   5 #include <functional>
   6 #include <jsoncpp/json/json.h>
   7 #include <random>
   8 #include <vector>
   9 #include "bcar.h"
  10
  11 #define ETA 1.0 // for steer, nv
  12 #define GAMMA(cV) ({ \
  13         __typeof__ (cV) _cV = (cV); \
  14         pow(log(_cV) / _cV, 1.0 / 3.0); \
  15 })
  16
  17 /*! \brief Possible type of RRT node.
  18
  19 \param cusp The node that is cusp (change in direction).
  20 \param connected The node that branches generated steered path.
  21 */
  22 class RRTNodeType {
  23         public:
  24                 static const unsigned int cusp = 1 << 0;
  25                 static const unsigned int connected = 1 << 1;
  26 };
  27
  28 /*! \brief RRT node basic class.
  29
  30 \param c Cumulative cost from RRT data structure root.
  31 \param p Pointer to parent RRT node.
  32 \param t Type of the RRT node (RRTNodeType).
  33 // -- from BicycleCar
  34 \param x Horizontal coordinate of rear axle center.
  35 \param y Vertical coordinate of rear axle center.
  36 \param h Heading of the car in the interval [-pi,+pi] radians.
  37 \param sp Speed of the car.
  38 \param st Steering of the car.
  39 */
  40 class RRTNode {
  41         private:
  42                 double c_ = 0;
  43                 RRTNode *p_ = nullptr;
  44                 unsigned int t_ = 0;
  45                 // -- from BicycleCar
  46                 // coordinates
  47                 double x_ = 0;
  48                 double y_ = 0;
  49                 double h_ = 0;
  50                 // moving
  51                 double sp_ = 0;
  52                 double st_ = 0;
  53         public:
  54                 // getters, setters
  55                 double c() const { return this->c_; }
  56                 void c(double c) { this->c_ = c; }
  57
  58                 RRTNode *p() const { return this->p_; }
  59                 void p(RRTNode *p) { this->p_ = p; }
  60
  61                 bool t(unsigned int flag) { return this->t_ & flag; }
  62                 void set_t(unsigned int flag) { this->t_ |= flag; }
  63                 void clear_t(unsigned int flag) { this->t_ &= ~flag; }
  64
  65                 // -- from BicycleCar
  66                 // getters, setters
  67                 double x() const { return this->x_; }
  68                 void x(double x) { this->x_ = x; }
  69
  70                 double y() const { return this->y_; }
  71                 void y(double y) { this->y_ = y; }
  72
  73                 double h() const { return this->h_; }
  74                 void h(double h)
  75                 {
  76                         while (h < -M_PI)
  77                                 h += 2 * M_PI;
  78                         while (h > +M_PI)
  79                                 h -= 2 * M_PI;
  80                         this->h_ = h;
  81                 }
  82
  83                 double sp() const { return this->sp_; }
  84                 void sp(double sp) { this->sp_ = sp; }
  85
  86                 double st() const { return this->st_; }
  87                 void st(double st) { this->st_ = st; }
  88
  89                 RRTNode();
  90                 RRTNode(const BicycleCar &bc);
  91                 bool operator==(const RRTNode& n);
  92                 friend std::ostream &operator<<(
  93                         std::ostream &out,
  94                         const RRTNode &bc
  95                 )
  96                 {
  97                         out << "[" << bc.x();
  98                         out << "," << bc.y();
  99                         out << "," << bc.h();
 100                         out << "]";
 101                         return out;
 102                 }
 103 };
 104
 105 /*! \brief Polygon obstacle basic class.
 106
 107 \param poly Border polygon of the obstacle.
 108 */
 109 class Obstacle {
 110         private:
 111                 std::vector<std::tuple<double, double>> poly_;
 112         public:
 113                 // getters, setters
 114                 std::vector<std::tuple<double, double>> &poly()
 115                 {
 116                         return this->poly_;
 117                 }
 118
 119                 Obstacle();
 120 };
 121
 122 /*! \brief RRT* algorithm basic class.
 123
 124 \param icnt RRT algorithm iterations counter.
 125 \param goals The vector of goal nodes.
 126 \param nodes The vector of all nodes in RRT data structure.
 127 \param samples The vector of all samples of RRT algorithm.
 128 \param sample_dist_type Random distribution type for sampling function (0 -
 129 normal, 1 - uniform, 2 - uniform circle)
 130 */
 131 class RRTS {
 132         private:
 133                 unsigned int icnt_ = 0;
 134                 std::chrono::high_resolution_clock::time_point tstart_;
 135                 double scnt_ = 0;
 136                 double pcnt_ = 0;
 137                 bool gf_ = false;
 138                 int sample_dist_type_ = 0;
 139
 140                 std::vector<RRTNode> goals_;
 141                 std::vector<RRTNode> nodes_;
 142                 std::vector<Obstacle> obstacles_;
 143                 std::vector<RRTNode> samples_;
 144                 std::vector<RRTNode> steered_;
 145                 double log_path_time_ = 0.1;
 146                 std::vector<double> log_path_cost_;
 147
 148                 /*! \brief Update and return elapsed time.
 149                 */
 150                 double elapsed();
 151                 /*! \brief Log current path cost.
 152                 */
 153                 void log_path_cost();
 154                 /*! \brief Set normal distribution for sampling.
 155                 */
 156                 void set_sample_normal(
 157                         double x1, double x2,
 158                         double y1, double y2,
 159                         double h1, double h2
 160                 );
 161                 /*! \brief Set uniform distribution for sampling.
 162                 */
 163                 void set_sample_uniform(
 164                         double x1, double x2,
 165                         double y1, double y2,
 166                         double h1, double h2
 167                 );
 168                 /*! \brief Set uniform circle distribution for sampling.
 169                 */
 170                 void set_sample_uniform_circle();
 171         protected:
 172                 bool finishit = false;
 173                 double path_cost_before_opt_ = 9999;
 174
 175                 BicycleCar bc;
 176                 /*! \brief Store RRT node to tree data structure.
 177                 */
 178                 virtual void store_node(RRTNode n);
 179
 180                 // RRT procedures
 181                 std::tuple<bool, unsigned int, unsigned int>
 182                 collide(std::vector<std::tuple<double, double>> &poly);
 183                 virtual std::tuple<bool, unsigned int, unsigned int>
 184                 collide_steered_from(RRTNode &f);
 185                 virtual std::tuple<bool, unsigned int, unsigned int>
 186                 collide_two_nodes(RRTNode &f, RRTNode &t);
 187                 void sample();
 188                         std::default_random_engine gen_;
 189                         std::normal_distribution<double> ndx_;
 190                         std::normal_distribution<double> ndy_;
 191                         std::normal_distribution<double> ndh_;
 192                         std::uniform_real_distribution<double> udx_;
 193                         std::uniform_real_distribution<double> udy_;
 194                         std::uniform_real_distribution<double> udh_;
 195                         std::uniform_int_distribution<unsigned int> udi_;
 196                 virtual RRTNode *nn(RRTNode &t);
 197                 virtual std::vector<RRTNode *> nv(RRTNode &t);
 198                 void steer(RRTNode &f, RRTNode &t);
 199                 virtual void steer1(RRTNode &f, RRTNode &t);
 200                 virtual void steer2(RRTNode &f, RRTNode &t);
 201                 /*! \brief Join steered nodes to RRT data structure
 202
 203                 \param f RRT node to join steered nodes to.
 204                 */
 205                 void join_steered(RRTNode *f);
 206                 virtual bool goal_found(RRTNode &f);
 207                 // RRT* procedures
 208                 bool connect();
 209                 void rewire();
 210         public:
 211                 /// ---
 212                 struct { double x=0; double y=0; double b=0; double e=0; } entry;
 213                 bool entry_set = false;
 214                 /// ---
 215                 /*! \brief Initialize RRT algorithm if needed.
 216                 */
 217                 virtual void init();
 218                 /*! \brief Deinitialize RRT algorithm if needed.
 219                 */
 220                 virtual void deinit();
 221                 /*! \brief Return path found by RRT*.
 222                 */
 223                 virtual std::vector<RRTNode *> path();
 224                 /*! \brief Return ``true`` if algorithm should stop.
 225
 226                 Update counters (iteration, seconds, ...) and return if
 227                 the current iteration should be the last one.
 228                 */
 229                 bool should_stop();
 230                 /*! \brief Return ``true`` if the algorithm should finish.
 231
 232                 Finish means that the algorithm will not be resumed.
 233                 */
 234                 bool should_finish();
 235                 /*! \brief Return ``true`` if the algorithm shoud break.
 236
 237                 Break means that the algorithm can be resumed.
 238                 */
 239                 bool should_break();
 240                 /*! \brief Return ``true`` if algorithm should continue.
 241
 242                 `pcnt_` is set to `scnt_`, so the difference is 0 and it can
 243                 start from scratch. After the `should_continue` is called,
 244                 there must be `while (rrts.next()) {}` loop.
 245                 */
 246                 bool should_continue();
 247                 /*! \brief Run next RRT* iteration.
 248                 */
 249                 bool next();
 250                 /*! \brief Set sampling info.
 251
 252                 Based on `sample_dist_type`, set proper distribution
 253                 parameters. The distribution parameters are relative to `front`
 254                 node in `nodes` (init).
 255
 256                 For normal sampling:
 257                 \param x1 Mean x value.
 258                 \param x2 Standard deviation of x.
 259                 \param y1 Mean y value.
 260                 \param y2 Standard deviation of y.
 261                 \param h1 Mean h value.
 262                 \param h2 Standard deviation of h.
 263
 264                 For uniform sampling:
 265                 \param x1 Minimum x value.
 266                 \param x2 Maximum x value.
 267                 \param y1 Minimum y value.
 268                 \param y2 Maximum y value.
 269                 \param h1 Minimum h value.
 270                 \param h2 Maximum h value.
 271
 272                 For uniform circle sampling:
 273                 \param x1 Ignored.
 274                 \param x2 Ignored.
 275                 \param y1 Ignored.
 276                 \param y2 Ignored.
 277                 \param h1 Ignored.
 278                 \param h2 Ignored.
 279                 */
 280                 void set_sample(
 281                         double x1, double x2,
 282                         double y1, double y2,
 283                         double h1, double h2
 284                 );
 285                 /*! \brief Generate JSON output.
 286                 */
 287                 Json::Value json();
 288                 /*! \brief Load JSON input.
 289                 */
 290                 void json(Json::Value jvi);
 291
 292                 // RRT procedures
 293                 virtual double cost_build(RRTNode &f, RRTNode &t);
 294                 virtual double cost_search(RRTNode &f, RRTNode &t);
 295
 296                 // getters, setters
 297                 unsigned int icnt() const { return this->icnt_; }
 298                 double scnt() const { return this->scnt_; }
 299                 bool gf() const { return this->gf_; }
 300                 void gf(bool f) { this->gf_ = f; }
 301                 int sample_dist_type() const { return this->sample_dist_type_;}
 302                 void sample_dist_type(int t) { this->sample_dist_type_ = t; }
 303                 std::vector<RRTNode> &goals() { return this->goals_; }
 304                 std::vector<RRTNode> &nodes() { return this->nodes_; }
 305                 std::vector<Obstacle> &obstacles() { return this->obstacles_; }
 306                 std::vector<RRTNode> &samples() { return this->samples_; }
 307                 std::vector<RRTNode> &steered() { return this->steered_; }
 308
 309                 RRTS();
 310 };
 311
 312 /*! \brief Compute cumulative cost of RRT node.
 313
 314 \param t RRT node to compute cumulative cost to.
 315 */
 316 double cc(RRTNode &t);
 317
 318 #endif /* RRTS_H */