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         layout.get_driver().signal_halt.connect(sigc::mem_fun(this, &Train::halt_event));
  64
  65         control->signal_control_changed.connect(signal_control_changed);
  66 }
  67
  68 Train::~Train()
  69 {
  70         delete control;
  71         delete timetable;
  72         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  73                 delete *i;
  74         layout.remove_train(*this);
  75 }
  76
  77 void Train::set_name(const string &n)
  78 {
  79         name = n;
  80
  81         signal_name_changed.emit(name);
  82 }
  83
  84 Vehicle &Train::get_vehicle(unsigned i)
  85 {
  86         if(i>=vehicles.size())
  87                 throw InvalidParameterValue("Vehicle index out of range");
  88         return *vehicles[i];
  89 }
  90
  91 const Vehicle &Train::get_vehicle(unsigned i) const
  92 {
  93         if(i>=vehicles.size())
  94                 throw InvalidParameterValue("Vehicle index out of range");
  95         return *vehicles[i];
  96 }
  97
  98 void Train::set_control(const string &n, float v)
  99 {
 100         control->set_control(n, v);
 101 }
 102
 103 void Train::set_active(bool a)
 104 {
 105         if(a==active)
 106                 return;
 107         if(!a && control->get_speed())
 108                 throw InvalidState("Can't deactivate while moving");
 109
 110         active = a;
 111         if(active)
 112         {
 113                 stop_timeout = Time::TimeStamp();
 114                 reserve_more();
 115         }
 116         else
 117         {
 118                 stop_timeout = Time::now()+2*Time::sec;
 119                 set_status("Stopped");
 120         }
 121 }
 122
 123 void Train::set_function(unsigned func, bool state)
 124 {
 125         if(!loco_type.get_functions().count(func))
 126                 throw InvalidParameterValue("Invalid function");
 127         if(func<5)
 128                 layout.get_driver().set_loco_function(address, func, state);
 129         else
 130                 layout.get_driver().set_loco_function(address+1, func-4, state);
 131 }
 132
 133 bool Train::get_function(unsigned func) const
 134 {
 135         return (functions>>func)&1;
 136 }
 137
 138 void Train::set_route(const Route *r)
 139 {
 140         if(!rsv_blocks.empty())
 141         {
 142                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 143                         if(i->block->get_sensor_id())
 144                         {
 145                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 146                                 break;
 147                         }
 148         }
 149
 150         route = r;
 151         next_route = 0;
 152         end_of_route = false;
 153
 154         if(route)
 155         {
 156                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 157                 BlockRef next = last.next();
 158                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 159                 if(!route->get_tracks().count(ep.track))
 160                 {
 161                         next_route = route;
 162                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 163                 }
 164         }
 165
 166         if(active)
 167                 reserve_more();
 168
 169         signal_route_changed.emit(route);
 170 }
 171
 172 void Train::go_to(const Track &to)
 173 {
 174         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 175                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 176                 {
 177                         signal_arrived.emit();
 178                         set_route(0);
 179                         return;
 180                 }
 181
 182         BlockRef *last = 0;
 183         if(rsv_blocks.empty())
 184                 last = &cur_blocks.back();
 185         else
 186         {
 187                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 188                         if(i->block->get_sensor_id())
 189                                 last = &*i;
 190         }
 191
 192         BlockRef next = last->next();
 193         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 194
 195         set_route(Route::find(*ep.track, ep.track_ep, to));
 196 }
 197
 198 void Train::place(Block &block, unsigned entry)
 199 {
 200         if(control->get_speed())
 201                 throw InvalidState("Must be stopped before placing");
 202
 203         release_blocks(rsv_blocks);
 204         release_blocks(cur_blocks);
 205
 206         set_active(false);
 207         accurate_position = false;
 208
 209         if(!block.reserve(this))
 210         {
 211                 set_status("Unplaced");
 212                 return;
 213         }
 214
 215         cur_blocks.push_back(BlockRef(&block, entry));
 216         if(reverse)
 217         {
 218                 unsigned exit = block.traverse(entry);
 219                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 220                 Track *track = bep.track->get_link(bep.track_ep);
 221                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 222                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 223         }
 224         else
 225         {
 226                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 227                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 228         }
 229 }
 230
 231 bool Train::free_block(Block &block)
 232 {
 233         unsigned nsens = 0;
 234         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 235         {
 236                 if(i->block==&block)
 237                 {
 238                         if(nsens<1)
 239                                 return false;
 240                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 241                         return true;
 242                 }
 243                 else if(i->block->get_sensor_id())
 244                         ++nsens;
 245         }
 246
 247         return false;
 248 }
 249
 250 int Train::get_entry_to_block(Block &block) const
 251 {
 252         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 253                 if(i->block==&block)
 254                         return i->entry;
 255         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 256                 if(i->block==&block)
 257                         return i->entry;
 258         return -1;
 259 }
 260
 261 float Train::get_reserved_distance() const
 262 {
 263         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 264         const VehicleType &vtype = veh.get_type();
 265
 266         Track *track = veh.get_track();
 267         if(!track)
 268                 return 0;
 269         unsigned entry = veh.get_entry();
 270
 271         float result = -vtype.get_length()/2;
 272         if(reverse)
 273         {
 274                 entry = track->traverse(entry);
 275                 result += veh.get_offset();
 276         }
 277         else
 278                 result -= veh.get_offset();
 279
 280         bool first = true;
 281         list<BlockRef>::const_iterator block = cur_blocks.begin();
 282         while(1)
 283         {
 284                 if(!first || !reverse)
 285                         result += track->get_type().get_path_length(track->get_active_path());
 286                 first = false;
 287
 288                 if(track->get_type().get_endpoints().size()<2)
 289                         return result;
 290
 291                 unsigned exit = track->traverse(entry);
 292                 Track *next = track->get_link(exit);
 293
 294                 while(!block->block->get_tracks().count(next))
 295                 {
 296                         ++block;
 297                         if(block==cur_blocks.end())
 298                                 block = rsv_blocks.begin();
 299                         if(block==rsv_blocks.end())
 300                                 return result;
 301                 }
 302
 303                 entry = next->get_endpoint_by_link(*track);
 304                 track = next;
 305         }
 306 }
 307
 308 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 309 {
 310         if(!active && stop_timeout && t>=stop_timeout)
 311         {
 312                 release_blocks(rsv_blocks);
 313                 end_of_route = false;
 314                 stop_timeout = Time::TimeStamp();
 315         }
 316
 317         Driver &driver = layout.get_driver();
 318
 319         if(timetable)
 320                 timetable->tick(t);
 321         control->tick(dt);
 322         float speed = control->get_speed();
 323         unsigned speed_notch = find_speed(abs(speed));
 324
 325         if(speed && (speed<0)!=reverse)
 326         {
 327                 driver.set_loco_reverse(address, speed<0);
 328                 reverse = speed<0;
 329
 330                 release_blocks(rsv_blocks);
 331                 reverse_blocks(cur_blocks);
 332
 333                 reserve_more();
 334         }
 335         if(speed_notch!=current_speed && !speed_changing && !driver.is_halted() && driver.get_power())
 336         {
 337                 speed_changing = true;
 338                 driver.set_loco_speed(address, speed_notch);
 339
 340                 pure_speed = false;
 341
 342                 if(speed_notch)
 343                         set_status(format("Traveling %d kmh", get_travel_speed()));
 344                 else
 345                         set_status("Waiting");
 346         }
 347
 348         if(speed)
 349         {
 350                 if(!active)
 351                         set_active(true);
 352
 353                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 354                 Track *track = vehicle.get_track();
 355
 356                 bool ok = false;
 357                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 358                         ok = i->block->get_tracks().count(track);
 359
 360                 float d = get_real_speed(current_speed)*(dt/Time::sec);
 361                 if(ok)
 362                         vehicle.advance(reverse ? -d : d);
 363                 else if(accurate_position)
 364                 {
 365                         overshoot_dist += d;
 366                         if(overshoot_dist>40*layout.get_catalogue().get_scale())
 367                         {
 368                                 layout.emergency(name+" has not arrived at sensor");
 369                                 accurate_position = false;
 370                         }
 371                 }
 372         }
 373         else if(end_of_route)
 374                 set_route(0);
 375 }
 376
 377 void Train::save(list<DataFile::Statement> &st) const
 378 {
 379         st.push_back((DataFile::Statement("name"), name));
 380
 381         for(vector<Vehicle *>::const_iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
 382                 if(i!=vehicles.begin())
 383                         st.push_back((DataFile::Statement("vehicle"), (*i)->get_type().get_article_number()));
 384
 385         for(unsigned i=0; i<=14; ++i)
 386                 if(real_speed[i].weight)
 387                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 388
 389         if(!cur_blocks.empty())
 390         {
 391                 list<BlockRef> blocks = cur_blocks;
 392                 if(reverse)
 393                         reverse_blocks(blocks);
 394
 395                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 396                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 397
 398                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 399                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 400         }
 401
 402         if(route)
 403         {
 404                 if(!route->is_temporary())
 405                         st.push_back((DataFile::Statement("route"), route->get_name()));
 406                 else if(next_route && !next_route->is_temporary())
 407                         st.push_back((DataFile::Statement("route"), next_route->get_name()));
 408         }
 409
 410         if(timetable)
 411         {
 412                 DataFile::Statement ss("timetable");
 413                 timetable->save(ss.sub);
 414                 st.push_back(ss);
 415         }
 416 }
 417
 418 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 419 {
 420         if(addr==address)
 421         {
 422                 current_speed = speed;
 423                 speed_changing = false;
 424                 pure_speed = false;
 425         }
 426 }
 427
 428 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 429 {
 430         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 431         {
 432                 if(addr==address+1)
 433                         func += 4;
 434                 if(state)
 435                         functions |= 1<<func;
 436                 else
 437                         functions &= ~(1<<func);
 438
 439                 signal_function_changed.emit(func, state);
 440         }
 441 }
 442
 443 void Train::sensor_event(unsigned addr, bool state)
 444 {
 445         if(state)
 446         {
 447                 // Find the first sensor block from our reserved blocks that isn't this sensor
 448                 list<BlockRef>::iterator i;
 449                 unsigned result = 0;
 450                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 451                         if(i->block->get_sensor_id())
 452                         {
 453                                 if(i->block->get_sensor_id()!=addr)
 454                                 {
 455                                         if(result==0)
 456                                                 result = 2;
 457                                         else if(result==1)
 458                                                 break;
 459                                 }
 460                                 else if(result==0)
 461                                         result = 1;
 462                                 else if(result==2)
 463                                         result = 3;
 464                         }
 465
 466                 if(result==1 && i!=rsv_blocks.begin())
 467                 {
 468                         // Compute speed and update related state
 469                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 470
 471                         if(pure_speed)
 472                         {
 473                                 RealSpeed &rs = real_speed[current_speed];
 474                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 475                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 476                         }
 477
 478                         travel_dist = 0;
 479                         float block_len;
 480                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 481                         {
 482                                 j->block->traverse(j->entry, &block_len);
 483                                 travel_dist += block_len;
 484
 485                                 if(j->block->get_sensor_id()==addr)
 486                                 {
 487                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 488                                         if(reverse)
 489                                         {
 490                                                 Track *track = bep.track->get_link(bep.track_ep);
 491                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 492                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 493                                         }
 494                                         else
 495                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 496                                 }
 497                         }
 498                         last_entry_time = Time::now();
 499                         pure_speed = true;
 500                         accurate_position = true;
 501                         overshoot_dist = 0;
 502
 503                         // Check if we've reached the next route
 504                         if(next_route)
 505                         {
 506                                 const set<const Track *> &rtracks = next_route->get_tracks();
 507                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 508                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 509                                         {
 510                                                 route = next_route;
 511                                                 next_route = 0;
 512                                                 // XXX Exceptions?
 513                                                 signal_route_changed.emit(route);
 514                                                 break;
 515                                         }
 516                         }
 517
 518                         // Move blocks up to the next sensor to our current blocks
 519                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 520
 521                         // Try to get more blocks if we're moving
 522                         if(active)
 523                         {
 524                                 unsigned nsens = reserve_more();
 525                                 if(!nsens && end_of_route)
 526                                         signal_arrived.emit();
 527                         }
 528                 }
 529                 else if(result==3)
 530                         layout.emergency("Sensor for "+name+" triggered out of order");
 531         }
 532         else
 533         {
 534                 // Find the first sensor in our current blocks that's still active
 535                 list<BlockRef>::iterator end = cur_blocks.begin();
 536                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 537                         if(i->block->get_sensor_id())
 538                         {
 539                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 540                                         break;
 541                                 else
 542                                         end = i;
 543                         }
 544
 545                 if(end!=cur_blocks.begin())
 546                 {
 547                         // Free blocks up to the last inactive sensor
 548                         ++end;
 549                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 550                 }
 551         }
 552 }
 553
 554 void Train::turnout_event(unsigned addr, bool)
 555 {
 556         if(pending_block)
 557         {
 558                 unsigned pending_addr = pending_block->get_turnout_id();
 559                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 560                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 561                         reserve_more();
 562         }
 563 }
 564
 565 void Train::halt_event(bool h)
 566 {
 567         if(h)
 568                 accurate_position = false;
 569 }
 570
 571 void Train::block_reserved(const Block &block, const Train *train)
 572 {
 573         if(&block==pending_block && !train)
 574                 reserve_more();
 575 }
 576
 577 unsigned Train::reserve_more()
 578 {
 579         BlockRef *last = 0;
 580         if(!rsv_blocks.empty())
 581                 last = &rsv_blocks.back();
 582         else if(!cur_blocks.empty())
 583                 last = &cur_blocks.back();
 584         if(!last)
 585                 return 0;
 586
 587         pending_block = 0;
 588
 589         // See how many sensor blocks we already have
 590         unsigned nsens = 0;
 591         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 592                 if(i->block->get_sensor_id())
 593                         ++nsens;
 594
 595         if(end_of_route)
 596                 return nsens;
 597
 598         const Route *cur_route = 0;
 599         if(route)
 600         {
 601                 const set<Track *> &tracks = last->block->get_tracks();
 602                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 603                 {
 604                         if(route->get_tracks().count(*i))
 605                                 cur_route = route;
 606                         else if(next_route && next_route->get_tracks().count(*i))
 607                                 cur_route = next_route;
 608                 }
 609         }
 610
 611         bool got_more = false;
 612         BlockRef *good = last;
 613         unsigned good_sens = nsens;
 614         while(good_sens<3)
 615         {
 616                 if(last->block->get_endpoints().size()<2)
 617                 {
 618                         good = last;
 619                         good_sens = nsens;
 620                         break;
 621                 }
 622
 623                 // Traverse to the next block
 624                 unsigned exit = last->block->traverse(last->entry);
 625                 Block *link = last->block->get_link(exit);
 626                 if(!link)
 627                         break;
 628
 629                 int entry = link->get_endpoint_by_link(*last->block);
 630                 if(entry<0)
 631                         throw LogicError("Block links are inconsistent!");
 632
 633                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 634
 635                 if(cur_route)
 636                 {
 637                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 638                                 cur_route = next_route;
 639                         else if(!cur_route->get_tracks().count(entry_ep.track))
 640                         {
 641                                 // Keep the blocks if we arrived at the end of the route
 642                                 good = last;
 643                                 good_sens = nsens;
 644                                 end_of_route = true;
 645                                 break;
 646                         }
 647                 }
 648                 else if(route && route->get_tracks().count(entry_ep.track))
 649                         cur_route = route;
 650
 651                 if(!link->reserve(this))
 652                 {
 653                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 654                         int other_entry = link->get_train()->get_entry_to_block(*link);
 655                         if(other_entry<0)
 656                                 throw LogicError("Block reservation inconsistency");
 657                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 658                         {
 659                                 good = last;
 660                                 good_sens = nsens;
 661                         }
 662                         pending_block = link;
 663                         break;
 664                 }
 665
 666                 if(link->get_turnout_id())
 667                 {
 668                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 669
 670                         // Keep the blocks reserved so far, as either us or the other train can diverge
 671                         good = last;
 672                         good_sens = nsens;
 673
 674                         // Figure out what path we'd like to take on the turnout
 675                         int path = -1;
 676                         if(cur_route)
 677                                 path = cur_route->get_turnout(link->get_turnout_id());
 678                         if(path<0)
 679                                 path = entry_ep.track->get_active_path();
 680                         if(!((track_ep.paths>>path)&1))
 681                         {
 682                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 683                                         if((track_ep.paths>>i)&1)
 684                                                 path = i;
 685                         }
 686
 687                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 688                         {
 689                                 // The turnout is set to wrong path - switch and wait for it
 690                                 link->reserve(0);
 691                                 pending_block = link;
 692                                 entry_ep.track->set_active_path(path);
 693                                 break;
 694                         }
 695                 }
 696
 697                 rsv_blocks.push_back(BlockRef(link, entry));
 698                 last = &rsv_blocks.back();
 699                 if(last->block->get_sensor_id())
 700                 {
 701                         ++nsens;
 702                         got_more = true;
 703                 }
 704         }
 705
 706         // Unreserve blocks that were not good
 707         while(!rsv_blocks.empty() && last!=good)
 708         {
 709                 last->block->reserve(0);
 710                 rsv_blocks.erase(--rsv_blocks.end());
 711                 if(!rsv_blocks.empty())
 712                         last = &rsv_blocks.back();
 713         }
 714
 715         // Make any sensorless blocks at the beginning immediately current
 716         list<BlockRef>::iterator i;
 717         for(i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !i->block->get_sensor_id()); ++i) ;
 718         if(i!=rsv_blocks.begin())
 719                 cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 720
 721         return good_sens;
 722 }
 723
 724 float Train::get_real_speed(unsigned i) const
 725 {
 726         if(real_speed[i].weight)
 727                 return real_speed[i].speed;
 728
 729         unsigned low;
 730         unsigned high;
 731         for(low=i; low>0; --low)
 732                 if(real_speed[low].weight)
 733                         break;
 734         for(high=i; high<14; ++high)
 735                 if(real_speed[high].weight)
 736                         break;
 737
 738         if(real_speed[high].weight)
 739         {
 740                 if(real_speed[low].weight)
 741                 {
 742                         float f = float(i-low)/(high-low);
 743                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 744                 }
 745                 else
 746                         return real_speed[high].speed*float(i)/high;
 747         }
 748         else if(real_speed[low].weight)
 749                 return real_speed[low].speed*float(i)/low;
 750         else
 751                 return 0;
 752 }
 753
 754 unsigned Train::find_speed(float real) const
 755 {
 756         if(real<=real_speed[0].speed)
 757                 return 0;
 758
 759         unsigned low = 0;
 760         unsigned high = 0;
 761         for(unsigned i=0; (!high && i<=14); ++i)
 762                 if(real_speed[i].weight)
 763                 {
 764                         if(real_speed[i].speed<real)
 765                                 low = i;
 766                         else
 767                                 high = i;
 768                 }
 769         if(!high)
 770         {
 771                 if(!low)
 772                         return 0;
 773                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 774         }
 775
 776         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 777         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 778 }
 779
 780 float Train::get_travel_speed() const
 781 {
 782         float speed = get_real_speed(current_speed);
 783         float scale = layout.get_catalogue().get_scale();
 784         return static_cast<int>(round(speed/scale*3.6/5))*5;
 785 }
 786
 787 void Train::set_status(const string &s)
 788 {
 789         status = s;
 790         signal_status_changed.emit(s);
 791 }
 792
 793 void Train::release_blocks(list<BlockRef> &blocks)
 794 {
 795         release_blocks(blocks, blocks.begin(), blocks.end());
 796 }
 797
 798 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 799 {
 800         while(begin!=end)
 801         {
 802                 Block *block = begin->block;
 803                 blocks.erase(begin++);
 804                 block->reserve(0);
 805         }
 806 }
 807
 808 void Train::reverse_blocks(list<BlockRef> &blocks) const
 809 {
 810         blocks.reverse();
 811         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 812                 i->entry = i->block->traverse(i->entry);
 813 }
 814
 815
 816 Train::BlockRef::BlockRef(Block *b, unsigned e):
 817         block(b),
 818         entry(e)
 819 { }
 820
 821 Train::BlockRef Train::BlockRef::next() const
 822 {
 823         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 824         if(!blk)
 825                 throw InvalidState("At end of line");
 826
 827         int ep = blk->get_endpoint_by_link(*block);
 828         if(ep<0)
 829                 throw LogicError("Block links are inconsistent");
 830
 831         return BlockRef(blk, ep);
 832 }
 833
 834
 835 Train::RealSpeed::RealSpeed():
 836         speed(0),
 837         weight(0)
 838 { }
 839
 840 void Train::RealSpeed::add(float s, float w)
 841 {
 842         speed = (speed*weight+s*w)/(weight+w);
 843         weight = min(weight+w, 300.0f);
 844 }
 845
 846
 847 Train::Loader::Loader(Train &t):
 848         DataFile::BasicLoader<Train>(t),
 849         prev_block(0)
 850 {
 851         add("block",       &Loader::block);
 852         add("block_hint",  &Loader::block_hint);
 853         add("name",        &Loader::name);
 854         add("real_speed",  &Loader::real_speed);
 855         add("route",       &Loader::route);
 856         add("timetable",   &Loader::timetable);
 857         add("vehicle",     &Loader::vehicle);
 858 }
 859
 860 void Train::Loader::block(unsigned id)
 861 {
 862         Block &blk = obj.layout.get_block(id);
 863         int entry = -1;
 864         if(prev_block)
 865                 entry = blk.get_endpoint_by_link(*prev_block);
 866         if(entry<0)
 867                 entry = 0;
 868
 869         blk.reserve(&obj);
 870         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 871         obj.set_status("Stopped");
 872         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 873         obj.vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 874
 875         if(blk.get_sensor_id())
 876                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 877
 878         prev_block = &blk;
 879 }
 880
 881 void Train::Loader::block_hint(unsigned id)
 882 {
 883         prev_block = &obj.layout.get_block(id);
 884 }
 885
 886 void Train::Loader::name(const string &n)
 887 {
 888         obj.set_name(n);
 889 }
 890
 891 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 892 {
 893         obj.real_speed[i].speed = speed;
 894         obj.real_speed[i].weight = weight;
 895 }
 896
 897 void Train::Loader::route(const string &n)
 898 {
 899         obj.set_route(&obj.layout.get_route(n));
 900 }
 901
 902 void Train::Loader::timetable()
 903 {
 904         if(obj.timetable)
 905                 throw InvalidState("A timetable has already been loaded");
 906
 907         obj.timetable = new Timetable(obj);
 908         load_sub(*obj.timetable);
 909 }
 910
 911 void Train::Loader::vehicle(unsigned n)
 912 {
 913         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(n);
 914         Vehicle *veh = new Vehicle(obj.layout, vtype);
 915         obj.vehicles.back()->attach_back(*veh);
 916         obj.vehicles.push_back(veh);
 917 }
 918
 919 } // namespace Marklin