source/designer/manipulator.cpp

   1 #include <algorithm>
   2 #include <cmath>
   3 #include <msp/strings/format.h>
   4 #include "libr2c2/tracktype.h"
   5 #include "designer.h"
   6 #include "manipulator.h"
   7 #include "selection.h"
   8
   9 using namespace std;
  10 using namespace R2C2;
  11 using namespace Msp;
  12
  13 Manipulator::Manipulator(Designer &d, Input::Mouse &m, Selection &s):
  14         designer(d),
  15         mouse(m),
  16         selection(s),
  17         mode(NONE),
  18         angle(0)
  19 {
  20         mouse.signal_button_press.connect(sigc::bind_return(sigc::mem_fun(this, &Manipulator::button_press), false));
  21         mouse.signal_axis_motion.connect(sigc::bind_return(sigc::mem_fun(this, &Manipulator::axis_motion), false));
  22         selection.signal_changed.connect(sigc::mem_fun(this, &Manipulator::selection_changed));
  23 }
  24
  25 void Manipulator::start_move()
  26 {
  27         if(mode)
  28                 cancel();
  29
  30         move_origin = gpointer;
  31
  32         mode = MOVE;
  33 }
  34
  35 void Manipulator::start_rotate()
  36 {
  37         if(mode)
  38                 cancel();
  39
  40         rot_origin = atan2(gpointer.y-center.y, gpointer.x-center.x);
  41
  42         mode = ROTATE;
  43 }
  44
  45 void Manipulator::start_elevate()
  46 {
  47         if(mode)
  48                 cancel();
  49
  50         mode = ELEVATE;
  51
  52         elev_origin = pointer.y;
  53 }
  54
  55 bool Manipulator::start_extend()
  56 {
  57         if(mode)
  58                 cancel();
  59
  60         bool ok = false;
  61         const set<Track *> &stracks = selection.get_objects<Track>();
  62         for(set<Track *>::const_iterator i=stracks.begin(); (!ok && i!=stracks.end()); ++i)
  63         {
  64                 const vector<Track *> &links = (*i)->get_links();
  65                 for(vector<Track *>::const_iterator j=links.begin(); (!ok && j!=links.end()); ++j)
  66                         ok = !*j;
  67         }
  68
  69         if(ok)
  70                 mode = EXTEND;
  71         else
  72                 signal_status.emit("No free endpoints");
  73
  74         return ok;
  75 }
  76
  77 void Manipulator::duplicate()
  78 {
  79         if(mode)
  80                 cancel();
  81
  82         list<Object *> new_objs;
  83         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
  84         {
  85                 Object *obj = i->object->clone(&designer.get_layout());
  86                 if(Track *track = dynamic_cast<Track *>(obj))
  87                 {
  88                         for(list<Object *>::iterator j=new_objs.begin(); j!=new_objs.end(); ++j)
  89                                 if(Track *track2 = dynamic_cast<Track *>(*j))
  90                                         track->snap_to(*track2, true);
  91                 }
  92                 new_objs.push_back(obj);
  93         }
  94
  95         selection.replace(new_objs.begin(), new_objs.end());
  96 }
  97
  98 void Manipulator::flatten()
  99 {
 100         if(mode)
 101                 cancel();
 102
 103         if(objects.empty())
 104                 return;
 105
 106         float z = 0;
 107         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 108         {
 109                 z += i->object->get_position().z;
 110                 if(Track *track = dynamic_cast<Track *>(i->object))
 111                         z += track->get_slope()/2;
 112         }
 113         z /= static_cast<int>(objects.size());
 114
 115         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 116         {
 117                 Vector p = i->object->get_position();
 118                 i->object->set_position(Vector(p.x, p.y, z));
 119                 if(Track *track = dynamic_cast<Track *>(i->object))
 120                         track->set_slope(0);
 121         }
 122
 123         for(set<Track *>::iterator i=neighbors.begin(); i!=neighbors.end(); ++i)
 124                 (*i)->check_slope();
 125
 126         update_objects();
 127 }
 128
 129 void Manipulator::even_slope(bool smooth)
 130 {
 131         if(mode)
 132                 cancel();
 133
 134         if(neighbors.size()!=2)
 135                 return;
 136
 137         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 138                 if(Track *track = dynamic_cast<Track *>(i->object))
 139                         if(track->get_type().get_endpoints().size()!=2)
 140                                 return;
 141
 142         list<Track *> tracks2;
 143         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 144                 if(Track *track = dynamic_cast<Track *>(i->object))
 145                         tracks2.push_back(track);
 146
 147         float total_len = 0;
 148
 149         list<TrackOrder> order;
 150         Track *cur = *neighbors.begin();
 151         while(tracks2.size())
 152         {
 153                 bool rev = false;
 154                 for(list<Track *>::iterator i=tracks2.begin(); i!=tracks2.end(); ++i)
 155                 {
 156                         const vector<Track *> &links = (*i)->get_links();
 157                         if(links[0]==cur)
 158                         {
 159                                 cur = *i;
 160                                 tracks2.erase(i);
 161                                 break;
 162                         }
 163                         else if(links[1]==cur)
 164                         {
 165                                 cur = *i;
 166                                 rev = true;
 167                                 tracks2.erase(i);
 168                                 break;
 169                         }
 170                 }
 171                 order.push_back(TrackOrder(cur, rev));
 172                 total_len += cur->get_type().get_total_length();
 173         }
 174
 175         set<Track *>::iterator nb = neighbors.begin();
 176         int epi = (*nb)->get_endpoint_by_link(*order.front().track);
 177         float start_z = (*nb)->get_endpoint_position(epi).z;
 178         ++nb;
 179         epi = (*nb)->get_endpoint_by_link(*order.back().track);
 180         float end_z = (*nb)->get_endpoint_position(epi).z;
 181
 182         if(smooth)
 183         {
 184                 float dir = (end_z>start_z)?1:-1;
 185                 float cur_slope = 0;
 186                 while((end_z-start_z)*dir/total_len>cur_slope+0.025 && order.size()>2)
 187                 {
 188                         cur_slope += 0.025;
 189
 190                         float dz = order.front().track->get_type().get_total_length()*dir*cur_slope;
 191                         set_slope(order.front(), start_z, dz);
 192                         start_z += dz;
 193                         total_len -= order.front().track->get_type().get_total_length();
 194                         order.erase(order.begin());
 195
 196                         dz = order.back().track->get_type().get_total_length()*dir*cur_slope;
 197                         set_slope(order.back(), end_z-dz, dz);
 198                         end_z -= dz;
 199                         total_len -= order.back().track->get_type().get_total_length();
 200                         order.erase(--order.end());
 201                 }
 202         }
 203
 204         float cur_z = start_z;
 205         for(list<TrackOrder>::iterator i=order.begin(); i!=order.end(); ++i)
 206         {
 207                 float dz = i->track->get_type().get_total_length()*(end_z-start_z)/total_len;
 208                 set_slope(*i, cur_z, dz);
 209                 cur_z += dz;
 210         }
 211
 212         for(set<Track *>::iterator i=neighbors.begin(); i!=neighbors.end(); ++i)
 213                 (*i)->check_slope();
 214
 215         update_objects();
 216 }
 217
 218 void Manipulator::connect()
 219 {
 220         if(objects.size()!=2)
 221         {
 222                 signal_status.emit("Exactly two tracks must be selected");
 223                 return;
 224         }
 225
 226         Track *track1 = dynamic_cast<Track *>(objects.front().object);
 227         Track *track2 = dynamic_cast<Track *>(objects.back().object);
 228         if(!track1 || !track2)
 229         {
 230                 signal_status.emit("Exactly two tracks must be selected");
 231                 return;
 232         }
 233
 234         float limit = designer.get_layout().get_catalogue().get_gauge()/10;
 235
 236         Vector pos1;
 237         float dir1;
 238         bool ok = false;
 239         float gap = 0;
 240         for(unsigned i=0; i<track1->get_type().get_endpoints().size(); ++i)
 241         {
 242                 if(track1->get_link(i))
 243                         continue;
 244
 245                 pos1 = track1->get_endpoint_position(i);
 246                 dir1 = track1->get_endpoint_direction(i);
 247
 248                 for(unsigned j=0; j<track2->get_type().get_endpoints().size(); ++j)
 249                 {
 250                         if(track2->get_link(j))
 251                                 continue;
 252
 253                         Vector pos2 = track2->get_endpoint_position(j);
 254                         float dir2 = track2->get_endpoint_direction(j);
 255
 256                         float dz = pos2.z-pos1.z;
 257                         if(abs(dz)>0.02)
 258                                 continue;
 259
 260                         float adiff = dir1+M_PI-dir2;
 261                         while(adiff<-M_PI)
 262                                 adiff += M_PI*2;
 263                         while(adiff>M_PI)
 264                                 adiff -= M_PI*2;
 265                         if(abs(adiff)>0.01)
 266                                 continue;
 267
 268                         float c = cos(dir1);
 269                         float s = sin(dir1);
 270                         float dx = pos2.x-pos1.x;
 271                         float dy = pos2.y-pos1.y;
 272                         if(abs(dx*s-dy*c)>limit)
 273                                 continue;
 274
 275                         gap = dx*c+dy*s;
 276                         if(gap<0)
 277                                 continue;
 278
 279                         ok = true;
 280                 }
 281
 282                 if(ok)
 283                         break;
 284         }
 285
 286         if(!ok)
 287         {
 288                 signal_status.emit("No aligned endpoints found");
 289                 return;
 290         }
 291
 292         vector<Track *> trks = create_straight(pos1, dir1, gap, limit);
 293
 294         if(trks.empty())
 295         {
 296                 signal_status.emit("No connection possible");
 297                 return;
 298         }
 299
 300         trks.front()->snap_to(*track1, true);
 301         trks.back()->snap_to(*track2, true);
 302
 303         selection.replace(trks.begin(), trks.end());
 304 }
 305
 306 void Manipulator::cancel()
 307 {
 308         if(!mode)
 309                 return;
 310         mode = NONE;
 311
 312         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 313         {
 314                 i->object->set_position(Vector(center.x+i->pos.x, center.y+i->pos.y, center.z+i->pos.z));
 315                 i->object->set_rotation(i->rot);
 316         }
 317
 318         for(set<Track *>::iterator i=neighbors.begin(); i!=neighbors.end(); ++i)
 319                 (*i)->check_slope();
 320
 321         for(vector<Track *>::iterator i=extend_tracks.begin(); i!=extend_tracks.end(); ++i)
 322                 delete *i;
 323         extend_tracks.clear();
 324
 325         angle = 0;
 326
 327         signal_done.emit(false);
 328 }
 329
 330 void Manipulator::button_press(unsigned btn)
 331 {
 332         if(!mode)
 333                 return;
 334
 335         if(btn==3)
 336                 cancel();
 337         else if(btn==1)
 338         {
 339                 Mode m = mode;
 340                 mode = NONE;
 341                 angle = 0;
 342
 343                 if(m!=EXTEND)
 344                 {
 345                         for(set<Track *>::iterator i=neighbors.begin(); i!=neighbors.end(); ++i)
 346                                 for(vector<MObject>::iterator j=objects.begin(); j!=objects.end(); ++j)
 347                                         if(Track *track = dynamic_cast<Track *>(j->object))
 348                                                 track->break_link(**i);
 349                 }
 350
 351                 const set<Track *> &ltracks = designer.get_layout().get_tracks();
 352                 for(set<Track *>::const_iterator i=ltracks.begin(); i!=ltracks.end(); ++i)
 353                 {
 354                         bool ok = true;
 355                         for(vector<MObject>::iterator j=objects.begin(); (j!=objects.end() && ok); ++j)
 356                                 ok = (j->object!=*i);
 357                         if(!ok) continue;
 358
 359                         for(vector<MObject>::iterator j=objects.begin(); j!=objects.end(); ++j)
 360                                 if(Track *track = dynamic_cast<Track *>(j->object))
 361                                         track->snap_to(**i, true);
 362                 }
 363
 364                 if(m==EXTEND)
 365                 {
 366                         selection.replace(extend_tracks.begin(), extend_tracks.end());
 367                         extend_tracks.clear();
 368                 }
 369                 else
 370                 {
 371                         update_objects();
 372                         update_neighbors();
 373                 }
 374
 375                 signal_done.emit(true);
 376         }
 377 }
 378
 379 void Manipulator::axis_motion(unsigned axis, float value, float)
 380 {
 381         if(axis==0)
 382                 pointer.x = value;
 383         else if(axis==1)
 384                 pointer.y = value;
 385         gpointer = designer.map_pointer_to_ground(pointer);
 386
 387         if(mode==MOVE)
 388         {
 389                 Vector delta(gpointer.x-move_origin.x, gpointer.y-move_origin.y, 0);
 390                 Vector offset(center.x+delta.x, center.y+delta.y, center.z);
 391                 for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 392                 {
 393                         i->object->set_position(Vector(offset.x+i->pos.x, offset.y+i->pos.y, offset.z+i->pos.z));
 394                         i->object->set_rotation(i->rot);
 395                 }
 396
 397                 const set<Track *> &ltracks = designer.get_layout().get_tracks();
 398                 float limit = max(designer.get_layout().get_catalogue().get_gauge(),
 399                         designer.get_camera_controller().get_view_scale()/100.0f);
 400                 MObject *snapped = 0;
 401                 for(set<Track *>::const_iterator i=ltracks.begin(); (i!=ltracks.end() && !snapped); ++i)
 402                 {
 403                         bool ok = true;
 404                         for(vector<MObject>::iterator j=objects.begin(); (j!=objects.end() && ok); ++j)
 405                                 ok = (j->object!=*i);
 406                         if(!ok)
 407                                 continue;
 408
 409                         for(vector<MObject>::iterator j=objects.begin(); (j!=objects.end() && !snapped); ++j)
 410                                 if(Track *track = dynamic_cast<Track *>(j->object))
 411                                         if(track->snap_to(**i, false, limit))
 412                                                 snapped = &*j;
 413                 }
 414
 415                 if(snapped)
 416                 {
 417                         float da = snapped->object->get_rotation()-snapped->rot;
 418                         float c = cos(da);
 419                         float s = sin(da);
 420                         const Vector &sp = snapped->object->get_position();
 421                         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 422                         {
 423                                 if(&*i==snapped)
 424                                         continue;
 425
 426                                 Vector dp(i->pos.x-snapped->pos.x, i->pos.y-snapped->pos.y, 0);
 427                                 i->object->set_position(Vector(sp.x+c*dp.x-s*dp.y, sp.y+s*dp.x+c*dp.y, sp.z+i->pos.z-snapped->pos.z));
 428                                 i->object->set_rotation(i->rot+da);
 429                         }
 430                 }
 431         }
 432         else if(mode==ROTATE)
 433         {
 434                 float a = atan2(gpointer.y-center.y, gpointer.x-center.x);
 435                 angle += a-rot_origin;
 436                 rot_origin = a;
 437
 438                 for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 439                 {
 440                         float c = cos(angle);
 441                         float s = sin(angle);
 442                         i->object->set_position(Vector(center.x+c*i->pos.x-s*i->pos.y, center.y+s*i->pos.x+c*i->pos.y, center.z+i->pos.z));
 443                         i->object->set_rotation(angle+i->rot);
 444                 }
 445         }
 446         else if(mode==ELEVATE && axis==1)
 447         {
 448                 float dz = pointer.y-elev_origin;
 449
 450                 signal_status.emit(format("Elevation: %+.0fmm (%.0fmm)", dz*1000, (center.z+dz)*1000));
 451
 452                 for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 453                         i->object->set_position(Vector(center.x+i->pos.x, center.y+i->pos.y, center.z+i->pos.z+dz));
 454
 455                 for(set<Track *>::iterator i=neighbors.begin(); i!=neighbors.end(); ++i)
 456                         (*i)->check_slope();
 457         }
 458         else if(mode==EXTEND)
 459         {
 460                 Vector pos;
 461                 float dir = 0;
 462                 float length = 0;
 463                 for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 464                 {
 465                         Track *track = dynamic_cast<Track *>(i->object);
 466                         if(!track)
 467                                 continue;
 468
 469                         unsigned n_endpoints = track->get_type().get_endpoints().size();
 470                         for(unsigned j=0; j<n_endpoints; ++j)
 471                         {
 472                                 if(track->get_link(j))
 473                                         continue;
 474
 475                                 Vector ep_pos = track->get_endpoint_position(j);
 476                                 float ep_dir = track->get_endpoint_direction(j);
 477                                 float c = cos(ep_dir);
 478                                 float s = sin(ep_dir);
 479                                 float dx = gpointer.x-ep_pos.x;
 480                                 float dy = gpointer.y-ep_pos.y;
 481
 482                                 float len = dx*c+dy*s;
 483                                 if(len<length)
 484                                         continue;
 485
 486                                 pos = ep_pos;
 487                                 dir = ep_dir;
 488                                 length = len;
 489                         }
 490                 }
 491
 492                 if(length)
 493                 {
 494                         vector<Track *> trks = create_straight(pos, dir, length, max(length/500, 0.001f));
 495
 496                         if(!trks.empty())
 497                         {
 498                                 for(vector<Track *>::iterator i=extend_tracks.begin(); i!=extend_tracks.end(); ++i)
 499                                         delete *i;
 500                                 extend_tracks = trks;
 501
 502                                 map<ArticleNumber, unsigned> counts;
 503                                 length = 0;
 504                                 for(vector<Track *>::iterator i=extend_tracks.begin(); i!=extend_tracks.end(); ++i)
 505                                 {
 506                                         length += (*i)->get_type().get_total_length();
 507                                         ++counts[(*i)->get_type().get_article_number()];
 508                                 }
 509
 510                                 string detail;
 511                                 for(map<ArticleNumber, unsigned>::const_iterator i=counts.begin(); i!=counts.end(); ++i)
 512                                 {
 513                                         if(!detail.empty())
 514                                                 detail += ", ";
 515                                         detail += format("%dx %s", i->second, i->first);
 516                                 }
 517
 518                                 signal_status.emit(format("Extend: %.0fmm (%s)", length*1000, detail));
 519                         }
 520                 }
 521         }
 522 }
 523
 524 void Manipulator::selection_changed()
 525 {
 526         if(mode)
 527                 cancel();
 528
 529         objects.clear();
 530         set<Object *> pending = selection.get_objects();
 531         while(!pending.empty())
 532         {
 533                 for(set<Object *>::iterator i=pending.begin(); i!=pending.end(); )
 534                 {
 535                         if((*i)->get_parent() && pending.count((*i)->get_parent()))
 536                                 ++i;
 537                         else
 538                         {
 539                                 objects.push_back(*i);
 540                                 pending.erase(i++);
 541                         }
 542                 }
 543         }
 544
 545         update_neighbors();
 546         update_objects();
 547 }
 548
 549 void Manipulator::update_objects()
 550 {
 551         Vector minp, maxp;
 552         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 553         {
 554                 // XXX Use generic bounding box when it is implemented
 555                 if(Track *track = dynamic_cast<Track *>(i->object))
 556                 {
 557                         unsigned n_endpoints = track->get_type().get_endpoints().size();
 558                         for(unsigned j=0; j<n_endpoints; ++j)
 559                         {
 560                                 Vector p = track->get_endpoint_position(j);
 561                                 if(i==objects.begin() && j==0)
 562                                         minp = maxp = p;
 563                                 else
 564                                 {
 565                                         minp.x = min(minp.x, p.x);
 566                                         maxp.x = max(maxp.x, p.x);
 567                                         minp.y = min(minp.y, p.y);
 568                                         maxp.y = max(maxp.y, p.y);
 569                                         minp.z = min(minp.z, p.z);
 570                                 }
 571                         }
 572                 }
 573                 else
 574                 {
 575                         const Vector &p = i->object->get_position();
 576                         minp.x = min(minp.x, p.x);
 577                         maxp.x = max(maxp.x, p.x);
 578                         minp.y = min(minp.y, p.y);
 579                         maxp.y = max(maxp.y, p.y);
 580                         minp.z = min(minp.z, p.z);
 581                 }
 582         }
 583
 584         center = Vector((minp.x+maxp.x)/2, (minp.y+maxp.y)/2, minp.z);
 585         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 586         {
 587                 const Vector &p = i->object->get_position();
 588                 i->pos = Vector(p.x-center.x, p.y-center.y, p.z-center.z);
 589                 i->rot = i->object->get_rotation();
 590         }
 591 }
 592
 593 void Manipulator::update_neighbors()
 594 {
 595         neighbors.clear();
 596         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 597         {
 598                 Track *track = dynamic_cast<Track *>(i->object);
 599                 if(!track)
 600                         continue;
 601
 602                 const vector<Track *> &links = track->get_links();
 603                 for(vector<Track *>::const_iterator j=links.begin(); j!=links.end(); ++j)
 604                 {
 605                         if(!*j)
 606                                 continue;
 607                         if(neighbors.count(*j))
 608                                 continue;
 609
 610                         bool ok = true;
 611                         for(vector<MObject>::iterator k=objects.begin(); (k!=objects.end() && ok); ++k)
 612                                 ok = (k->object!=*j);
 613
 614                         if(ok)
 615                                 neighbors.insert(*j);
 616                 }
 617         }
 618 }
 619
 620 void Manipulator::set_slope(TrackOrder &track, float z, float dz)
 621 {
 622         const Vector &p = track.track->get_position();
 623         if(track.rev)
 624         {
 625                 track.track->set_position(Vector(p.x, p.y, z+dz));
 626                 track.track->set_slope(-dz);
 627         }
 628         else
 629         {
 630                 track.track->set_position(Vector(p.x, p.y, z));
 631                 track.track->set_slope(dz);
 632         }
 633 }
 634
 635 vector<Track *> Manipulator::create_straight(const R2C2::Vector &start, float dir, float length, float limit)
 636 {
 637         const Catalogue::TrackMap &track_types = designer.get_catalogue().get_tracks();
 638         std::map<float, const TrackType *> types_by_length;
 639         unsigned preference = 0;
 640         for(Catalogue::TrackMap::const_iterator i=track_types.begin(); i!=track_types.end(); ++i)
 641         {
 642                 const vector<TrackPart> &parts = i->second->get_parts();
 643                 if(parts.size()!=1)
 644                         continue;
 645                 if(parts.front().is_curved() || parts.front().is_dead_end())
 646                         continue;
 647
 648                 types_by_length[parts.front().get_length()] = i->second;
 649                 preference = max(preference, i->second->get_autofit_preference());
 650         }
 651
 652         vector<float> lengths;
 653         float removed = 0;
 654         while(length>limit)
 655         {
 656                 bool found = false;
 657                 for(map<float, const TrackType *>::iterator i=types_by_length.end(); i!=types_by_length.begin(); )
 658                 {
 659                         --i;
 660                         if(i->second->get_autofit_preference()<preference)
 661                                 continue;
 662                         if((!removed || i->first<removed) && i->first<length+limit)
 663                         {
 664                                 unsigned n = static_cast<unsigned>((length+limit)/i->first);
 665                                 lengths.insert(lengths.end(), n, i->first);
 666                                 length -= n*i->first;
 667                                 found = true;
 668                                 break;
 669                         }
 670                 }
 671
 672                 if(found)
 673                         continue;
 674
 675                 if(lengths.empty())
 676                 {
 677                         if(preference>0)
 678                         {
 679                                 --preference;
 680                                 removed = 0;
 681                                 continue;
 682                         }
 683                         break;
 684                 }
 685
 686                 length += lengths.back();
 687                 removed = lengths.back();
 688                 lengths.pop_back();
 689         }
 690
 691         vector<Track *> trks;
 692
 693         if(!lengths.empty())
 694         {
 695                 Vector pos = start;
 696                 float c = cos(dir);
 697                 float s = sin(dir);
 698                 for(vector<float>::iterator i=lengths.begin(); i!=lengths.end(); ++i)
 699                 {
 700                         Track *track = new Track(designer.get_layout(), *get_item(types_by_length, *i));
 701                         track->set_position(pos);
 702                         track->set_rotation(dir);
 703
 704                         if(!trks.empty())
 705                                 track->snap_to(*trks.back(), true);
 706                         trks.push_back(track);
 707
 708                         pos.x += c**i;
 709                         pos.y += s**i;
 710                 }
 711         }
 712
 713         return trks;
 714 }
 715
 716
 717 Manipulator::MObject::MObject(Object *o):
 718         object(o),
 719         pos(object->get_position()),
 720         rot(object->get_rotation())
 721 { }