source/libmarklin/train.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 <msp/strings/formatter.h>
  10 #include <msp/time/units.h>
  11 #include <msp/time/utils.h>
  12 #include "aicontrol.h"
  13 #include "catalogue.h"
  14 #include "driver.h"
  15 #include "layout.h"
  16 #include "locotype.h"
  17 #include "route.h"
  18 #include "simplephysics.h"
  19 #include "timetable.h"
  20 #include "tracktype.h"
  21 #include "train.h"
  22 #include "vehicle.h"
  23
  24 using namespace std;
  25 using namespace Msp;
  26
  27 namespace Marklin {
  28
  29 Train::Train(Layout &l, const LocoType &t, unsigned a):
  30         layout(l),
  31         loco_type(t),
  32         address(a),
  33         pending_block(0),
  34         control(new AIControl(*this, new SimplePhysics)),
  35         timetable(0),
  36         active(false),
  37         current_speed(0),
  38         speed_changing(false),
  39         reverse(false),
  40         functions(0),
  41         route(0),
  42         next_route(0),
  43         end_of_route(false),
  44         status("Unplaced"),
  45         travel_dist(0),
  46         pure_speed(false),
  47         real_speed(15),
  48         accurate_position(false),
  49         overshoot_dist(false)
  50 {
  51         vehicles.push_back(new Vehicle(layout, loco_type));
  52
  53         layout.add_train(*this);
  54
  55         layout.get_driver().add_loco(address);
  56         layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
  57         layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
  58
  59         layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
  60         layout.get_driver().signal_sensor.connect(sigc::mem_fun(this, &Train::sensor_event));
  61         layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Train::turnout_event));
  62
  63         control->signal_control_changed.connect(signal_control_changed);
  64 }
  65
  66 Train::~Train()
  67 {
  68         delete control;
  69         delete timetable;
  70         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  71                 delete *i;
  72         layout.remove_train(*this);
  73 }
  74
  75 void Train::set_name(const string &n)
  76 {
  77         name = n;
  78
  79         signal_name_changed.emit(name);
  80 }
  81
  82 Vehicle &Train::get_vehicle(unsigned i)
  83 {
  84         if(i>=vehicles.size())
  85                 throw InvalidParameterValue("Vehicle index out of range");
  86         return *vehicles[i];
  87 }
  88
  89 const Vehicle &Train::get_vehicle(unsigned i) const
  90 {
  91         if(i>=vehicles.size())
  92                 throw InvalidParameterValue("Vehicle index out of range");
  93         return *vehicles[i];
  94 }
  95
  96 void Train::set_control(const string &n, float v)
  97 {
  98         control->set_control(n, v);
  99 }
 100
 101 void Train::set_active(bool a)
 102 {
 103         if(a==active)
 104                 return;
 105         if(!a && control->get_speed())
 106                 throw InvalidState("Can't deactivate while moving");
 107
 108         active = a;
 109         if(active)
 110         {
 111                 stop_timeout = Time::TimeStamp();
 112                 reserve_more();
 113         }
 114         else
 115         {
 116                 stop_timeout = Time::now()+2*Time::sec;
 117                 set_status("Stopped");
 118         }
 119 }
 120
 121 void Train::set_function(unsigned func, bool state)
 122 {
 123         if(!loco_type.get_functions().count(func))
 124                 throw InvalidParameterValue("Invalid function");
 125         if(func<5)
 126                 layout.get_driver().set_loco_function(address, func, state);
 127         else
 128                 layout.get_driver().set_loco_function(address+1, func-4, state);
 129 }
 130
 131 bool Train::get_function(unsigned func) const
 132 {
 133         return (functions>>func)&1;
 134 }
 135
 136 void Train::set_route(const Route *r)
 137 {
 138         if(!rsv_blocks.empty())
 139         {
 140                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 141                         if(i->block->get_sensor_id())
 142                         {
 143                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 144                                 break;
 145                         }
 146         }
 147
 148         route = r;
 149         next_route = 0;
 150         end_of_route = false;
 151
 152         if(route)
 153         {
 154                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 155                 BlockRef next = last.next();
 156                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 157                 if(!route->get_tracks().count(ep.track))
 158                 {
 159                         next_route = route;
 160                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 161                 }
 162         }
 163
 164         if(active)
 165                 reserve_more();
 166
 167         signal_route_changed.emit(route);
 168 }
 169
 170 void Train::go_to(const Track &to)
 171 {
 172         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 173                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 174                 {
 175                         signal_arrived.emit();
 176                         set_route(0);
 177                         return;
 178                 }
 179
 180         BlockRef *last = 0;
 181         if(rsv_blocks.empty())
 182                 last = &cur_blocks.back();
 183         else
 184         {
 185                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 186                         if(i->block->get_sensor_id())
 187                                 last = &*i;
 188         }
 189
 190         BlockRef next = last->next();
 191         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 192
 193         set_route(Route::find(*ep.track, ep.track_ep, to));
 194 }
 195
 196 void Train::place(Block &block, unsigned entry)
 197 {
 198         if(control->get_speed())
 199                 throw InvalidState("Must be stopped before placing");
 200
 201         release_blocks(rsv_blocks);
 202         release_blocks(cur_blocks);
 203
 204         set_active(false);
 205         accurate_position = false;
 206
 207         if(!block.reserve(this))
 208         {
 209                 set_status("Unplaced");
 210                 return;
 211         }
 212
 213         cur_blocks.push_back(BlockRef(&block, entry));
 214         if(reverse)
 215         {
 216                 unsigned exit = block.traverse(entry);
 217                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 218                 Track *track = bep.track->get_link(bep.track_ep);
 219                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 220                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 221         }
 222         else
 223         {
 224                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 225                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 226         }
 227 }
 228
 229 bool Train::free_block(Block &block)
 230 {
 231         unsigned nsens = 0;
 232         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 233         {
 234                 if(i->block==&block)
 235                 {
 236                         if(nsens<1)
 237                                 return false;
 238                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 239                         return true;
 240                 }
 241                 else if(i->block->get_sensor_id())
 242                         ++nsens;
 243         }
 244
 245         return false;
 246 }
 247
 248 int Train::get_entry_to_block(Block &block) const
 249 {
 250         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 251                 if(i->block==&block)
 252                         return i->entry;
 253         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 254                 if(i->block==&block)
 255                         return i->entry;
 256         return -1;
 257 }
 258
 259 float Train::get_reserved_distance() const
 260 {
 261         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 262         const VehicleType &vtype = veh.get_type();
 263
 264         Track *track = veh.get_track();
 265         unsigned entry = veh.get_entry();
 266
 267         float result = -vtype.get_length()/2;
 268         if(reverse)
 269         {
 270                 entry = track->traverse(entry);
 271                 result += veh.get_offset();
 272         }
 273         else
 274                 result -= veh.get_offset();
 275
 276         bool first = true;
 277         list<BlockRef>::const_iterator block = cur_blocks.begin();
 278         while(1)
 279         {
 280                 if(!first || !reverse)
 281                         result += track->get_type().get_path_length(track->get_active_path());
 282                 first = false;
 283
 284                 unsigned exit = track->traverse(entry);
 285                 Track *next = track->get_link(exit);
 286
 287                 while(!block->block->get_tracks().count(next))
 288                 {
 289                         ++block;
 290                         if(block==cur_blocks.end())
 291                                 block = rsv_blocks.begin();
 292                         if(block==rsv_blocks.end())
 293                                 return result;
 294                 }
 295
 296                 entry = next->get_endpoint_by_link(*track);
 297                 track = next;
 298         }
 299 }
 300
 301 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 302 {
 303         if(!active && stop_timeout && t>=stop_timeout)
 304         {
 305                 release_blocks(rsv_blocks);
 306                 end_of_route = false;
 307                 stop_timeout = Time::TimeStamp();
 308         }
 309
 310         Driver &driver = layout.get_driver();
 311
 312         if(timetable)
 313                 timetable->tick(t);
 314         control->tick(dt);
 315         float speed = control->get_speed();
 316         unsigned speed_notch = find_speed(abs(speed));
 317
 318         if(speed && (speed<0)!=reverse)
 319         {
 320                 driver.set_loco_reverse(address, speed<0);
 321                 reverse = speed<0;
 322
 323                 release_blocks(rsv_blocks);
 324                 reverse_blocks(cur_blocks);
 325
 326                 reserve_more();
 327         }
 328         if(speed_notch!=current_speed && !speed_changing && !driver.is_halted() && driver.get_power())
 329         {
 330                 speed_changing = true;
 331                 driver.set_loco_speed(address, speed_notch);
 332
 333                 pure_speed = false;
 334
 335                 if(speed_notch)
 336                         set_status(format("Traveling %d kmh", get_travel_speed()));
 337                 else
 338                         set_status("Waiting");
 339         }
 340
 341         if(speed)
 342         {
 343                 if(!active)
 344                         set_active(true);
 345
 346                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 347                 Track *track = vehicle.get_track();
 348
 349                 bool ok = false;
 350                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 351                         ok = i->block->get_tracks().count(track);
 352
 353                 float d = get_real_speed(current_speed)*(dt/Time::sec);
 354                 if(ok)
 355                         vehicle.advance(reverse ? -d : d);
 356                 else if(accurate_position)
 357                 {
 358                         overshoot_dist += d;
 359                         if(overshoot_dist>40*layout.get_catalogue().get_scale())
 360                                 layout.emergency(name+" has not arrived at sensor");
 361                 }
 362         }
 363         else if(end_of_route)
 364                 set_route(0);
 365 }
 366
 367 void Train::save(list<DataFile::Statement> &st) const
 368 {
 369         st.push_back((DataFile::Statement("name"), name));
 370
 371         for(vector<Vehicle *>::const_iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
 372                 if(i!=vehicles.begin())
 373                         st.push_back((DataFile::Statement("vehicle"), (*i)->get_type().get_article_number()));
 374
 375         for(unsigned i=0; i<=14; ++i)
 376                 if(real_speed[i].weight)
 377                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 378
 379         if(!cur_blocks.empty())
 380         {
 381                 list<BlockRef> blocks = cur_blocks;
 382                 if(reverse)
 383                         reverse_blocks(blocks);
 384
 385                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 386                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 387
 388                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 389                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 390         }
 391
 392         if(route)
 393                 st.push_back((DataFile::Statement("route"), route->get_name()));
 394
 395         if(timetable)
 396         {
 397                 DataFile::Statement ss("timetable");
 398                 timetable->save(ss.sub);
 399                 st.push_back(ss);
 400         }
 401 }
 402
 403 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 404 {
 405         if(addr==address)
 406         {
 407                 current_speed = speed;
 408                 speed_changing = false;
 409                 pure_speed = false;
 410         }
 411 }
 412
 413 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 414 {
 415         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 416         {
 417                 if(addr==address+1)
 418                         func += 4;
 419                 if(state)
 420                         functions |= 1<<func;
 421                 else
 422                         functions &= ~(1<<func);
 423
 424                 signal_function_changed.emit(func, state);
 425         }
 426 }
 427
 428 void Train::sensor_event(unsigned addr, bool state)
 429 {
 430         if(state)
 431         {
 432                 // Find the first sensor block from our reserved blocks that isn't this sensor
 433                 list<BlockRef>::iterator i;
 434                 unsigned result = 0;
 435                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 436                         if(i->block->get_sensor_id())
 437                         {
 438                                 if(i->block->get_sensor_id()!=addr)
 439                                 {
 440                                         if(result==0)
 441                                                 result = 2;
 442                                         else if(result==1)
 443                                                 break;
 444                                 }
 445                                 else if(result==0)
 446                                         result = 1;
 447                                 else if(result==2)
 448                                         result = 3;
 449                         }
 450
 451                 if(result==1 && i!=rsv_blocks.begin())
 452                 {
 453                         // Compute speed and update related state
 454                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 455
 456                         if(pure_speed)
 457                         {
 458                                 RealSpeed &rs = real_speed[current_speed];
 459                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 460                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 461                         }
 462
 463                         travel_dist = 0;
 464                         float block_len;
 465                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 466                         {
 467                                 j->block->traverse(j->entry, &block_len);
 468                                 travel_dist += block_len;
 469
 470                                 if(j->block->get_sensor_id()==addr)
 471                                 {
 472                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 473                                         if(reverse)
 474                                         {
 475                                                 Track *track = bep.track->get_link(bep.track_ep);
 476                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 477                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 478                                         }
 479                                         else
 480                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 481                                 }
 482                         }
 483                         last_entry_time = Time::now();
 484                         pure_speed = true;
 485                         accurate_position = true;
 486                         overshoot_dist = 0;
 487
 488                         // Check if we've reached the next route
 489                         if(next_route)
 490                         {
 491                                 const set<const Track *> &rtracks = next_route->get_tracks();
 492                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 493                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 494                                         {
 495                                                 route = next_route;
 496                                                 next_route = 0;
 497                                                 // XXX Exceptions?
 498                                                 signal_route_changed.emit(route);
 499                                                 break;
 500                                         }
 501                         }
 502
 503                         // Move blocks up to the next sensor to our current blocks
 504                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 505
 506                         // Try to get more blocks if we're moving
 507                         if(active)
 508                         {
 509                                 unsigned nsens = reserve_more();
 510                                 if(!nsens && end_of_route)
 511                                         signal_arrived.emit();
 512                         }
 513                 }
 514                 else if(result==3)
 515                         layout.emergency("Sensor for "+name+" triggered out of order");
 516         }
 517         else
 518         {
 519                 // Find the first sensor in our current blocks that's still active
 520                 list<BlockRef>::iterator end = cur_blocks.begin();
 521                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 522                         if(i->block->get_sensor_id())
 523                         {
 524                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 525                                         break;
 526                                 else
 527                                         end = i;
 528                         }
 529
 530                 if(end!=cur_blocks.begin())
 531                 {
 532                         // Free blocks up to the last inactive sensor
 533                         ++end;
 534                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 535                 }
 536         }
 537 }
 538
 539 void Train::turnout_event(unsigned addr, bool)
 540 {
 541         if(pending_block)
 542         {
 543                 unsigned pending_addr = pending_block->get_turnout_id();
 544                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 545                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 546                         reserve_more();
 547         }
 548 }
 549
 550 void Train::block_reserved(const Block &block, const Train *train)
 551 {
 552         if(&block==pending_block && !train)
 553                 reserve_more();
 554 }
 555
 556 unsigned Train::reserve_more()
 557 {
 558         BlockRef *last = 0;
 559         if(!rsv_blocks.empty())
 560                 last = &rsv_blocks.back();
 561         else if(!cur_blocks.empty())
 562                 last = &cur_blocks.back();
 563         if(!last)
 564                 return 0;
 565
 566         pending_block = 0;
 567
 568         // See how many sensor blocks we already have
 569         unsigned nsens = 0;
 570         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 571                 if(i->block->get_sensor_id())
 572                         ++nsens;
 573
 574         if(end_of_route)
 575                 return nsens;
 576
 577         const Route *cur_route = 0;
 578         if(route)
 579         {
 580                 const set<Track *> &tracks = last->block->get_tracks();
 581                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 582                 {
 583                         if(route->get_tracks().count(*i))
 584                                 cur_route = route;
 585                         else if(next_route && next_route->get_tracks().count(*i))
 586                                 cur_route = next_route;
 587                 }
 588         }
 589
 590         bool got_more = false;
 591         BlockRef *good = last;
 592         unsigned good_sens = nsens;
 593         while(good_sens<3)
 594         {
 595                 // Traverse to the next block
 596                 unsigned exit = last->block->traverse(last->entry);
 597                 Block *link = last->block->get_link(exit);
 598                 if(!link)
 599                         break;
 600
 601                 int entry = link->get_endpoint_by_link(*last->block);
 602                 if(entry<0)
 603                         throw LogicError("Block links are inconsistent!");
 604
 605                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 606
 607                 if(cur_route)
 608                 {
 609                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 610                                 cur_route = next_route;
 611                         else if(!cur_route->get_tracks().count(entry_ep.track))
 612                         {
 613                                 // Keep the blocks if we arrived at the end of the route
 614                                 good = last;
 615                                 good_sens = nsens;
 616                                 end_of_route = true;
 617                                 break;
 618                         }
 619                 }
 620                 else if(route && route->get_tracks().count(entry_ep.track))
 621                         cur_route = route;
 622
 623                 if(!link->reserve(this))
 624                 {
 625                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 626                         int other_entry = link->get_train()->get_entry_to_block(*link);
 627                         if(other_entry<0)
 628                                 throw LogicError("Block reservation inconsistency");
 629                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 630                         {
 631                                 good = last;
 632                                 good_sens = nsens;
 633                         }
 634                         pending_block = link;
 635                         break;
 636                 }
 637
 638                 if(link->get_turnout_id())
 639                 {
 640                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 641
 642                         // Keep the blocks reserved so far, as either us or the other train can diverge
 643                         good = last;
 644                         good_sens = nsens;
 645
 646                         // Figure out what path we'd like to take on the turnout
 647                         int path = -1;
 648                         if(cur_route)
 649                                 path = cur_route->get_turnout(link->get_turnout_id());
 650                         if(path<0)
 651                                 path = entry_ep.track->get_active_path();
 652                         if(!((track_ep.paths>>path)&1))
 653                         {
 654                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 655                                         if((track_ep.paths>>i)&1)
 656                                                 path = i;
 657                         }
 658
 659                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 660                         {
 661                                 // The turnout is set to wrong path - switch and wait for it
 662                                 link->reserve(0);
 663                                 pending_block = link;
 664                                 entry_ep.track->set_active_path(path);
 665                                 break;
 666                         }
 667                 }
 668
 669                 rsv_blocks.push_back(BlockRef(link, entry));
 670                 last = &rsv_blocks.back();
 671                 if(last->block->get_sensor_id())
 672                 {
 673                         ++nsens;
 674                         got_more = true;
 675                 }
 676         }
 677
 678         // Unreserve blocks that were not good
 679         while(!rsv_blocks.empty() && last!=good)
 680         {
 681                 last->block->reserve(0);
 682                 rsv_blocks.erase(--rsv_blocks.end());
 683                 if(!rsv_blocks.empty())
 684                         last = &rsv_blocks.back();
 685         }
 686
 687         // Make any sensorless blocks at the beginning immediately current
 688         list<BlockRef>::iterator i;
 689         for(i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !i->block->get_sensor_id()); ++i) ;
 690         if(i!=rsv_blocks.begin())
 691                 cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 692
 693         return good_sens;
 694 }
 695
 696 float Train::get_real_speed(unsigned i) const
 697 {
 698         if(real_speed[i].weight)
 699                 return real_speed[i].speed;
 700
 701         unsigned low;
 702         unsigned high;
 703         for(low=i; low>0; --low)
 704                 if(real_speed[low].weight)
 705                         break;
 706         for(high=i; high<14; ++high)
 707                 if(real_speed[high].weight)
 708                         break;
 709
 710         if(real_speed[high].weight)
 711         {
 712                 if(real_speed[low].weight)
 713                 {
 714                         float f = float(i-low)/(high-low);
 715                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 716                 }
 717                 else
 718                         return real_speed[high].speed*float(i)/high;
 719         }
 720         else if(real_speed[low].weight)
 721                 return real_speed[low].speed*float(i)/low;
 722         else
 723                 return 0;
 724 }
 725
 726 unsigned Train::find_speed(float real) const
 727 {
 728         if(real<=real_speed[0].speed)
 729                 return 0;
 730
 731         unsigned low = 0;
 732         unsigned high = 0;
 733         for(unsigned i=0; (!high && i<=14); ++i)
 734                 if(real_speed[i].weight)
 735                 {
 736                         if(real_speed[i].speed<real)
 737                                 low = i;
 738                         else
 739                                 high = i;
 740                 }
 741         if(!high)
 742         {
 743                 if(!low)
 744                         return 0;
 745                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 746         }
 747
 748         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 749         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 750 }
 751
 752 float Train::get_travel_speed() const
 753 {
 754         float speed = get_real_speed(current_speed);
 755         float scale = layout.get_catalogue().get_scale();
 756         return static_cast<int>(round(speed/scale*3.6/5))*5;
 757 }
 758
 759 void Train::set_status(const string &s)
 760 {
 761         status = s;
 762         signal_status_changed.emit(s);
 763 }
 764
 765 void Train::release_blocks(list<BlockRef> &blocks)
 766 {
 767         release_blocks(blocks, blocks.begin(), blocks.end());
 768 }
 769
 770 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 771 {
 772         while(begin!=end)
 773         {
 774                 Block *block = begin->block;
 775                 blocks.erase(begin++);
 776                 block->reserve(0);
 777         }
 778 }
 779
 780 void Train::reverse_blocks(list<BlockRef> &blocks) const
 781 {
 782         blocks.reverse();
 783         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 784                 i->entry = i->block->traverse(i->entry);
 785 }
 786
 787
 788 Train::BlockRef::BlockRef(Block *b, unsigned e):
 789         block(b),
 790         entry(e)
 791 { }
 792
 793 Train::BlockRef Train::BlockRef::next() const
 794 {
 795         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 796         if(!blk)
 797                 throw InvalidState("At end of line");
 798
 799         int ep = blk->get_endpoint_by_link(*block);
 800         if(ep<0)
 801                 throw LogicError("Block links are inconsistent");
 802
 803         return BlockRef(blk, ep);
 804 }
 805
 806
 807 Train::RealSpeed::RealSpeed():
 808         speed(0),
 809         weight(0)
 810 { }
 811
 812 void Train::RealSpeed::add(float s, float w)
 813 {
 814         speed = (speed*weight+s*w)/(weight+w);
 815         weight = min(weight+w, 300.0f);
 816 }
 817
 818
 819 Train::Loader::Loader(Train &t):
 820         DataFile::BasicLoader<Train>(t),
 821         prev_block(0)
 822 {
 823         add("block",       &Loader::block);
 824         add("block_hint",  &Loader::block_hint);
 825         add("name",        &Loader::name);
 826         add("real_speed",  &Loader::real_speed);
 827         add("route",       &Loader::route);
 828         add("timetable",   &Loader::timetable);
 829         add("vehicle",     &Loader::vehicle);
 830 }
 831
 832 void Train::Loader::block(unsigned id)
 833 {
 834         Block &blk = obj.layout.get_block(id);
 835         int entry = -1;
 836         if(prev_block)
 837                 entry = blk.get_endpoint_by_link(*prev_block);
 838         if(entry<0)
 839                 entry = 0;
 840
 841         blk.reserve(&obj);
 842         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 843         obj.set_status("Stopped");
 844         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 845         obj.vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 846
 847         if(blk.get_sensor_id())
 848                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 849
 850         prev_block = &blk;
 851 }
 852
 853 void Train::Loader::block_hint(unsigned id)
 854 {
 855         prev_block = &obj.layout.get_block(id);
 856 }
 857
 858 void Train::Loader::name(const string &n)
 859 {
 860         obj.set_name(n);
 861 }
 862
 863 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 864 {
 865         obj.real_speed[i].speed = speed;
 866         obj.real_speed[i].weight = weight;
 867 }
 868
 869 void Train::Loader::route(const string &n)
 870 {
 871         obj.set_route(&obj.layout.get_route(n));
 872 }
 873
 874 void Train::Loader::timetable()
 875 {
 876         if(obj.timetable)
 877                 throw InvalidState("A timetable has already been loaded");
 878
 879         obj.timetable = new Timetable(obj);
 880         load_sub(*obj.timetable);
 881 }
 882
 883 void Train::Loader::vehicle(unsigned n)
 884 {
 885         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(n);
 886         Vehicle *veh = new Vehicle(obj.layout, vtype);
 887         obj.vehicles.back()->attach_back(*veh);
 888         obj.vehicles.push_back(veh);
 889 }
 890
 891 } // namespace Marklin