source/libmarklin/track.cpp

   1 /* $Id$
   2
   3 This file is part of the MSP Märklin suite
   4 Copyright © 2006-2010  Mikkosoft Productions, Mikko Rasa
   5 Distributed under the GPL
   6 */
   7
   8 #include <cmath>
   9 #include "driver.h"
  10 #include "layout.h"
  11 #include "track.h"
  12 #include "tracktype.h"
  13
  14 using namespace std;
  15 using namespace Msp;
  16
  17 namespace Marklin {
  18
  19 Track::Track(Layout &l, const TrackType &t):
  20         layout(l),
  21         type(t),
  22         rot(0),
  23         slope(0),
  24         flex(false),
  25         turnout_id(0),
  26         sensor_id(0),
  27         links(t.get_endpoints().size()),
  28         active_path(0)
  29 {
  30         layout.add_track(*this);
  31
  32         if(layout.has_driver())
  33                 layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Track::turnout_event));
  34
  35         for(unsigned paths = type.get_paths(); !(paths&1); ++active_path, paths>>=1) ;
  36 }
  37
  38 Track::~Track()
  39 {
  40         break_links();
  41         layout.remove_track(*this);
  42 }
  43
  44 void Track::set_position(const Point &p)
  45 {
  46         pos = p;
  47 }
  48
  49 void Track::set_rotation(float r)
  50 {
  51         rot = r;
  52         while(rot<0)
  53                 rot += M_PI*2;
  54         while(rot>M_PI*2)
  55                 rot -= M_PI*2;
  56 }
  57
  58 void Track::set_slope(float s)
  59 {
  60         if(links.size()!=2)
  61                 return;
  62
  63         slope = s;
  64 }
  65
  66 void Track::set_flex(bool f)
  67 {
  68         flex = f;
  69 }
  70
  71 void Track::check_slope()
  72 {
  73         if(links.size()!=2)
  74                 return;
  75
  76         if(links[0] && links[1])
  77         {
  78                 Point epp0 = links[0]->get_endpoint_position(links[0]->get_endpoint_by_link(*this));
  79                 Point epp1 = links[1]->get_endpoint_position(links[1]->get_endpoint_by_link(*this));
  80                 pos.z = epp0.z;
  81                 slope = epp1.z-pos.z;
  82         }
  83         else
  84         {
  85                 slope = 0;
  86                 if(links[0])
  87                 {
  88                         Point epp = links[0]->get_endpoint_position(links[0]->get_endpoint_by_link(*this));
  89                         pos.z = epp.z;
  90                 }
  91                 else if(links[1])
  92                 {
  93                         Point epp = links[1]->get_endpoint_position(links[1]->get_endpoint_by_link(*this));
  94                         pos.z = epp.z;
  95                 }
  96         }
  97 }
  98
  99 void Track::set_turnout_id(unsigned i)
 100 {
 101         if(!type.is_turnout())
 102                 throw InvalidState("Not a turnout");
 103
 104         turnout_id = i;
 105         layout.create_blocks(*this);
 106         if(layout.has_driver() && turnout_id)
 107         {
 108                 layout.get_driver().add_turnout(turnout_id);
 109                 if(type.is_double_address())
 110                         layout.get_driver().add_turnout(turnout_id+1);
 111         }
 112 }
 113
 114 void Track::set_sensor_id(unsigned i)
 115 {
 116         if(type.is_turnout())
 117                 throw InvalidState("Can't set sensor on a turnout");
 118
 119         sensor_id = i;
 120         layout.create_blocks(*this);
 121         if(layout.has_driver() && sensor_id)
 122                 layout.get_driver().add_sensor(sensor_id);
 123 }
 124
 125 void Track::set_active_path(unsigned p)
 126 {
 127         if(!turnout_id)
 128                 throw InvalidState("Not a turnout");
 129         if(!(type.get_paths()&(1<<p)))
 130                 throw InvalidParameterValue("Invalid path");
 131
 132         layout.get_driver().set_turnout(turnout_id, p&1);
 133         if(type.get_n_paths()>2)
 134                 layout.get_driver().set_turnout(turnout_id+1, p&2);
 135 }
 136
 137 int Track::get_endpoint_by_link(const Track &other) const
 138 {
 139         for(unsigned i=0; i<links.size(); ++i)
 140                 if(links[i]==&other)
 141                         return i;
 142
 143         return -1;
 144 }
 145
 146 Point Track::get_endpoint_position(unsigned epi) const
 147 {
 148         const vector<Endpoint> &eps = type.get_endpoints();
 149         if(epi>=eps.size())
 150                 throw InvalidParameterValue("Endpoint index out of range");
 151
 152         const Endpoint &ep = eps[epi];
 153
 154         float c = cos(rot);
 155         float s = sin(rot);
 156
 157         Point p(pos.x+c*ep.pos.x-s*ep.pos.y, pos.y+s*ep.pos.x+c*ep.pos.y, pos.z);
 158         if(eps.size()==2 && epi==1)
 159                 p.z += slope;
 160         return p;
 161 }
 162
 163 float Track::get_endpoint_direction(unsigned epi) const
 164 {
 165         const vector<Endpoint> &eps = type.get_endpoints();
 166         if(epi>=eps.size())
 167                 throw InvalidParameterValue("Endpoint index out of range");
 168
 169         const Endpoint &ep = eps[epi];
 170
 171         return rot+ep.dir;
 172 }
 173
 174 bool Track::snap_to(Track &other, bool link)
 175 {
 176         float limit = (link && !flex) ? 1e-6 : 1e-4;
 177         const vector<Endpoint> &eps = type.get_endpoints();
 178         const vector<Endpoint> &other_eps = other.get_type().get_endpoints();
 179
 180         for(unsigned i=0; i<eps.size(); ++i)
 181         {
 182                 Point epp = get_endpoint_position(i);
 183
 184                 for(unsigned j=0; j<other_eps.size(); ++j)
 185                 {
 186                         if(other.get_link(j))
 187                                 continue;
 188
 189                         Point epp2 = other.get_endpoint_position(j);
 190                         float dx = epp2.x-epp.x;
 191                         float dy = epp2.y-epp.y;
 192                         if(dx*dx+dy*dy<limit)
 193                         {
 194                                 set_rotation(other.rot+other_eps[j].dir-eps[i].dir+M_PI);
 195                                 Point p(epp2.x-(eps[i].pos.x*cos(rot)-eps[i].pos.y*sin(rot)),
 196                                         epp2.y-(eps[i].pos.y*cos(rot)+eps[i].pos.x*sin(rot)),
 197                                         epp2.z);
 198                                 if(eps.size()==2 && i==1)
 199                                         p.z -= slope;
 200                                 set_position(p);
 201
 202                                 if(link)
 203                                 {
 204                                         if(links[i])
 205                                                 break_link(*links[i]);
 206                                         links[i] = &other;
 207                                         other.links[j] = this;
 208                                         layout.create_blocks(*this);
 209                                 }
 210
 211                                 return true;
 212                         }
 213                 }
 214         }
 215
 216         return false;
 217 }
 218
 219 bool Track::snap(Point &pt, float &d) const
 220 {
 221         const vector<Endpoint> &eps = type.get_endpoints();
 222
 223         for(unsigned i=0; i<eps.size(); ++i)
 224         {
 225                 Point epp = get_endpoint_position(i);
 226                 float dx = pt.x-epp.x;
 227                 float dy = pt.y-epp.y;
 228                 if(dx*dx+dy*dy<1e-4)
 229                 {
 230                         pt = epp;
 231                         d = rot+eps[i].dir;
 232                         return true;
 233                 }
 234         }
 235
 236         return false;
 237 }
 238
 239 void Track::break_link(Track &trk)
 240 {
 241         for(vector<Track *>::iterator i=links.begin(); i!=links.end(); ++i)
 242                 if(*i==&trk)
 243                 {
 244                         *i = 0;
 245                         trk.break_link(*this);
 246                         // XXX Creates the blocks twice
 247                         layout.create_blocks(*this);
 248                         return;
 249                 }
 250 }
 251
 252 void Track::break_links()
 253 {
 254         for(vector<Track *>::iterator i=links.begin(); i!=links.end(); ++i)
 255                 if(Track *trk=*i)
 256                 {
 257                         *i = 0;
 258                         trk->break_link(*this);
 259                 }
 260 }
 261
 262 Track *Track::get_link(unsigned i) const
 263 {
 264         if(i>links.size())
 265                 throw InvalidParameterValue("Link index out of range");
 266
 267         return links[i];
 268 }
 269
 270 unsigned Track::traverse(unsigned i, unsigned path) const
 271 {
 272         const vector<Endpoint> &eps = type.get_endpoints();
 273         if(i>=eps.size())
 274                 throw InvalidParameterValue("Endpoint index out of range");
 275
 276         const Endpoint &ep = eps[i];
 277
 278         if(ep.paths&(1<<path))
 279         {
 280                 // Find the other endpoint for this path
 281                 for(unsigned j=0; j<eps.size(); ++j)
 282                         if((eps[j].paths&(1<<path)) && j!=i)
 283                                 return j;
 284         }
 285         else
 286         {
 287                 // Find an endpoint that's connected to this one and has the requested path
 288                 for(unsigned j=0; j<eps.size(); ++j)
 289                         if((eps[j].paths&(1<<path)) && (eps[j].paths&ep.paths))
 290                                 return j;
 291         }
 292
 293         throw Exception("Track endpoint did not have a counterpart");
 294 }
 295
 296 TrackPoint Track::get_point(unsigned epi, unsigned path, float d) const
 297 {
 298         TrackPoint p = type.get_point(epi, path, d);
 299         float c = cos(rot);
 300         float s = sin(rot);
 301
 302         p.pos = Point(pos.x+c*p.pos.x-s*p.pos.y, pos.y+s*p.pos.x+c*p.pos.y, 0);
 303         if(type.get_endpoints().size()==2)
 304         {
 305                 float len = type.get_path_length(path);
 306                 float grade = slope/len;
 307                 if(epi==0)
 308                 {
 309                         p.pos.z = pos.z+grade*d;
 310                         p.grade = grade;
 311                 }
 312                 else
 313                 {
 314                         p.pos.z = pos.z+slope-grade*d;
 315                         p.grade = -grade;
 316                 }
 317         }
 318
 319         return p;
 320 }
 321
 322 void Track::save(list<DataFile::Statement> &st) const
 323 {
 324         st.push_back((DataFile::Statement("position"), pos.x, pos.y, pos.z));
 325         st.push_back((DataFile::Statement("rotation"), rot));
 326         st.push_back((DataFile::Statement("slope"), slope));
 327         if(turnout_id)
 328                 st.push_back((DataFile::Statement("turnout_id"), turnout_id));
 329         if(sensor_id)
 330                 st.push_back((DataFile::Statement("sensor_id"), sensor_id));
 331         if(flex)
 332                 st.push_back((DataFile::Statement("flex"), true));
 333 }
 334
 335 void Track::turnout_event(unsigned addr, bool state)
 336 {
 337         if(!turnout_id)
 338                 return;
 339
 340         if(addr==turnout_id)
 341                 active_path = (active_path&2) | (state ? 1 : 0);
 342         else if(type.is_double_address() && addr==turnout_id+1)
 343                 active_path = (active_path&1) | (state ? 2 : 0);
 344 }
 345
 346
 347 Track::Loader::Loader(Track &t):
 348         DataFile::BasicLoader<Track>(t)
 349 {
 350         add("position",   &Loader::position);
 351         add("rotation",   &Track::rot);
 352         add("slope",      &Track::slope);
 353         add("turnout_id", &Loader::turnout_id);
 354         add("sensor_id",  &Loader::sensor_id);
 355         add("flex",       &Track::flex);
 356 }
 357
 358 void Track::Loader::position(float x, float y, float z)
 359 {
 360         obj.pos = Point(x, y, z);
 361 }
 362
 363 void Track::Loader::sensor_id(unsigned id)
 364 {
 365         obj.set_sensor_id(id);
 366 }
 367
 368 void Track::Loader::turnout_id(unsigned id)
 369 {
 370         obj.set_turnout_id(id);
 371 }
 372
 373 } // namespace Marklin