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_snap_node(epi).position.z;
 178         ++nb;
 179         epi = (*nb)->get_endpoint_by_link(*order.back().track);
 180         float end_z = (*nb)->get_snap_node(epi).position.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         Snap sn1;
 237         bool ok = false;
 238         float gap = 0;
 239         for(unsigned i=0; i<track1->get_type().get_endpoints().size(); ++i)
 240         {
 241                 if(track1->get_link(i))
 242                         continue;
 243
 244                 sn1 = track1->get_snap_node(i);
 245
 246                 for(unsigned j=0; j<track2->get_type().get_endpoints().size(); ++j)
 247                 {
 248                         if(track2->get_link(j))
 249                                 continue;
 250
 251                         Snap sn2 = track2->get_snap_node(j);
 252
 253                         float dz = sn2.position.z-sn1.position.z;
 254                         if(abs(dz)>0.02)
 255                                 continue;
 256
 257                         float adiff = sn1.rotation+M_PI-sn2.rotation;
 258                         while(adiff<-M_PI)
 259                                 adiff += M_PI*2;
 260                         while(adiff>M_PI)
 261                                 adiff -= M_PI*2;
 262                         if(abs(adiff)>0.01)
 263                                 continue;
 264
 265                         float c = cos(sn1.rotation);
 266                         float s = sin(sn1.rotation);
 267                         float dx = sn2.position.x-sn1.position.x;
 268                         float dy = sn2.position.y-sn1.position.y;
 269                         if(abs(dx*s-dy*c)>limit)
 270                                 continue;
 271
 272                         gap = dx*c+dy*s;
 273                         if(gap<0)
 274                                 continue;
 275
 276                         ok = true;
 277                 }
 278
 279                 if(ok)
 280                         break;
 281         }
 282
 283         if(!ok)
 284         {
 285                 signal_status.emit("No aligned endpoints found");
 286                 return;
 287         }
 288
 289         vector<Track *> trks = create_straight(sn1.position, sn1.rotation, gap, limit);
 290
 291         if(trks.empty())
 292         {
 293                 signal_status.emit("No connection possible");
 294                 return;
 295         }
 296
 297         trks.front()->snap_to(*track1, true);
 298         trks.back()->snap_to(*track2, true);
 299
 300         selection.replace(trks.begin(), trks.end());
 301 }
 302
 303 void Manipulator::cancel()
 304 {
 305         if(!mode)
 306                 return;
 307         mode = NONE;
 308
 309         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 310         {
 311                 i->object->set_position(Vector(center.x+i->pos.x, center.y+i->pos.y, center.z+i->pos.z));
 312                 i->object->set_rotation(i->rot);
 313         }
 314
 315         for(set<Track *>::iterator i=neighbors.begin(); i!=neighbors.end(); ++i)
 316                 (*i)->check_slope();
 317
 318         for(vector<Track *>::iterator i=extend_tracks.begin(); i!=extend_tracks.end(); ++i)
 319                 delete *i;
 320         extend_tracks.clear();
 321
 322         angle = 0;
 323
 324         signal_done.emit(false);
 325 }
 326
 327 void Manipulator::button_press(unsigned btn)
 328 {
 329         if(!mode)
 330                 return;
 331
 332         if(btn==3)
 333                 cancel();
 334         else if(btn==1)
 335         {
 336                 Mode m = mode;
 337                 mode = NONE;
 338                 angle = 0;
 339
 340                 if(m!=EXTEND)
 341                 {
 342                         for(set<Track *>::iterator i=neighbors.begin(); i!=neighbors.end(); ++i)
 343                                 for(vector<MObject>::iterator j=objects.begin(); j!=objects.end(); ++j)
 344                                         if(Track *track = dynamic_cast<Track *>(j->object))
 345                                                 track->break_link(**i);
 346                 }
 347
 348                 const set<Track *> &ltracks = designer.get_layout().get_tracks();
 349                 for(set<Track *>::const_iterator i=ltracks.begin(); i!=ltracks.end(); ++i)
 350                 {
 351                         bool ok = true;
 352                         for(vector<MObject>::iterator j=objects.begin(); (j!=objects.end() && ok); ++j)
 353                                 ok = (j->object!=*i);
 354                         if(!ok) continue;
 355
 356                         for(vector<MObject>::iterator j=objects.begin(); j!=objects.end(); ++j)
 357                                 if(Track *track = dynamic_cast<Track *>(j->object))
 358                                         track->snap_to(**i, true);
 359                 }
 360
 361                 if(m==EXTEND)
 362                 {
 363                         selection.replace(extend_tracks.begin(), extend_tracks.end());
 364                         extend_tracks.clear();
 365                 }
 366                 else
 367                 {
 368                         update_objects();
 369                         update_neighbors();
 370                 }
 371
 372                 signal_done.emit(true);
 373         }
 374 }
 375
 376 void Manipulator::axis_motion(unsigned axis, float value, float)
 377 {
 378         if(axis==0)
 379                 pointer.x = value;
 380         else if(axis==1)
 381                 pointer.y = value;
 382         gpointer = designer.map_pointer_to_ground(pointer);
 383
 384         if(mode==MOVE)
 385         {
 386                 Vector delta(gpointer.x-move_origin.x, gpointer.y-move_origin.y, 0);
 387                 Vector offset(center.x+delta.x, center.y+delta.y, center.z);
 388                 for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 389                 {
 390                         i->object->set_position(Vector(offset.x+i->pos.x, offset.y+i->pos.y, offset.z+i->pos.z));
 391                         i->object->set_rotation(i->rot);
 392                 }
 393
 394                 const set<Track *> &ltracks = designer.get_layout().get_tracks();
 395                 float limit = max(designer.get_layout().get_catalogue().get_gauge(),
 396                         designer.get_camera_controller().get_view_scale()/100.0f);
 397                 MObject *snapped = 0;
 398                 for(set<Track *>::const_iterator i=ltracks.begin(); (i!=ltracks.end() && !snapped); ++i)
 399                 {
 400                         bool ok = true;
 401                         for(vector<MObject>::iterator j=objects.begin(); (j!=objects.end() && ok); ++j)
 402                                 ok = (j->object!=*i);
 403                         if(!ok)
 404                                 continue;
 405
 406                         for(vector<MObject>::iterator j=objects.begin(); (j!=objects.end() && !snapped); ++j)
 407                                 if(Track *track = dynamic_cast<Track *>(j->object))
 408                                         if(track->snap_to(**i, false, limit))
 409                                                 snapped = &*j;
 410                 }
 411
 412                 if(snapped)
 413                 {
 414                         float da = snapped->object->get_rotation()-snapped->rot;
 415                         float c = cos(da);
 416                         float s = sin(da);
 417                         const Vector &sp = snapped->object->get_position();
 418                         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 419                         {
 420                                 if(&*i==snapped)
 421                                         continue;
 422
 423                                 Vector dp(i->pos.x-snapped->pos.x, i->pos.y-snapped->pos.y, 0);
 424                                 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));
 425                                 i->object->set_rotation(i->rot+da);
 426                         }
 427                 }
 428         }
 429         else if(mode==ROTATE)
 430         {
 431                 float a = atan2(gpointer.y-center.y, gpointer.x-center.x);
 432                 angle += a-rot_origin;
 433                 rot_origin = a;
 434
 435                 for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 436                 {
 437                         float c = cos(angle);
 438                         float s = sin(angle);
 439                         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));
 440                         i->object->set_rotation(angle+i->rot);
 441                 }
 442         }
 443         else if(mode==ELEVATE && axis==1)
 444         {
 445                 float dz = pointer.y-elev_origin;
 446
 447                 signal_status.emit(format("Elevation: %+.0fmm (%.0fmm)", dz*1000, (center.z+dz)*1000));
 448
 449                 for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 450                         i->object->set_position(Vector(center.x+i->pos.x, center.y+i->pos.y, center.z+i->pos.z+dz));
 451
 452                 for(set<Track *>::iterator i=neighbors.begin(); i!=neighbors.end(); ++i)
 453                         (*i)->check_slope();
 454         }
 455         else if(mode==EXTEND)
 456         {
 457                 Vector pos;
 458                 float dir = 0;
 459                 float length = 0;
 460                 for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 461                 {
 462                         Track *track = dynamic_cast<Track *>(i->object);
 463                         if(!track)
 464                                 continue;
 465
 466                         unsigned n_endpoints = track->get_type().get_endpoints().size();
 467                         for(unsigned j=0; j<n_endpoints; ++j)
 468                         {
 469                                 if(track->get_link(j))
 470                                         continue;
 471
 472                                 Snap sn = track->get_snap_node(j);
 473                                 float c = cos(sn.rotation);
 474                                 float s = sin(sn.rotation);
 475                                 float dx = gpointer.x-sn.position.x;
 476                                 float dy = gpointer.y-sn.position.y;
 477
 478                                 float len = dx*c+dy*s;
 479                                 if(len<length)
 480                                         continue;
 481
 482                                 pos = sn.position;
 483                                 dir = sn.rotation;
 484                                 length = len;
 485                         }
 486                 }
 487
 488                 if(length)
 489                 {
 490                         vector<Track *> trks = create_straight(pos, dir, length, max(length/500, 0.001f));
 491
 492                         if(!trks.empty())
 493                         {
 494                                 for(vector<Track *>::iterator i=extend_tracks.begin(); i!=extend_tracks.end(); ++i)
 495                                         delete *i;
 496                                 extend_tracks = trks;
 497
 498                                 map<ArticleNumber, unsigned> counts;
 499                                 length = 0;
 500                                 for(vector<Track *>::iterator i=extend_tracks.begin(); i!=extend_tracks.end(); ++i)
 501                                 {
 502                                         length += (*i)->get_type().get_total_length();
 503                                         ++counts[(*i)->get_type().get_article_number()];
 504                                 }
 505
 506                                 string detail;
 507                                 for(map<ArticleNumber, unsigned>::const_iterator i=counts.begin(); i!=counts.end(); ++i)
 508                                 {
 509                                         if(!detail.empty())
 510                                                 detail += ", ";
 511                                         detail += format("%dx %s", i->second, i->first);
 512                                 }
 513
 514                                 signal_status.emit(format("Extend: %.0fmm (%s)", length*1000, detail));
 515                         }
 516                 }
 517         }
 518 }
 519
 520 void Manipulator::selection_changed()
 521 {
 522         if(mode)
 523                 cancel();
 524
 525         objects.clear();
 526         set<Object *> pending = selection.get_objects();
 527         while(!pending.empty())
 528         {
 529                 for(set<Object *>::iterator i=pending.begin(); i!=pending.end(); )
 530                 {
 531                         if((*i)->get_parent() && pending.count((*i)->get_parent()))
 532                                 ++i;
 533                         else
 534                         {
 535                                 objects.push_back(*i);
 536                                 pending.erase(i++);
 537                         }
 538                 }
 539         }
 540
 541         update_neighbors();
 542         update_objects();
 543 }
 544
 545 void Manipulator::update_objects()
 546 {
 547         Vector minp, maxp;
 548         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 549         {
 550                 // XXX Use generic bounding box when it is implemented
 551                 if(Track *track = dynamic_cast<Track *>(i->object))
 552                 {
 553                         unsigned n_endpoints = track->get_type().get_endpoints().size();
 554                         for(unsigned j=0; j<n_endpoints; ++j)
 555                         {
 556                                 Vector p = track->get_snap_node(j).position;
 557                                 if(i==objects.begin() && j==0)
 558                                         minp = maxp = p;
 559                                 else
 560                                 {
 561                                         minp.x = min(minp.x, p.x);
 562                                         maxp.x = max(maxp.x, p.x);
 563                                         minp.y = min(minp.y, p.y);
 564                                         maxp.y = max(maxp.y, p.y);
 565                                         minp.z = min(minp.z, p.z);
 566                                 }
 567                         }
 568                 }
 569                 else
 570                 {
 571                         const Vector &p = i->object->get_position();
 572                         minp.x = min(minp.x, p.x);
 573                         maxp.x = max(maxp.x, p.x);
 574                         minp.y = min(minp.y, p.y);
 575                         maxp.y = max(maxp.y, p.y);
 576                         minp.z = min(minp.z, p.z);
 577                 }
 578         }
 579
 580         center = Vector((minp.x+maxp.x)/2, (minp.y+maxp.y)/2, minp.z);
 581         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 582         {
 583                 const Vector &p = i->object->get_position();
 584                 i->pos = Vector(p.x-center.x, p.y-center.y, p.z-center.z);
 585                 i->rot = i->object->get_rotation();
 586         }
 587 }
 588
 589 void Manipulator::update_neighbors()
 590 {
 591         neighbors.clear();
 592         for(vector<MObject>::iterator i=objects.begin(); i!=objects.end(); ++i)
 593         {
 594                 Track *track = dynamic_cast<Track *>(i->object);
 595                 if(!track)
 596                         continue;
 597
 598                 const vector<Track *> &links = track->get_links();
 599                 for(vector<Track *>::const_iterator j=links.begin(); j!=links.end(); ++j)
 600                 {
 601                         if(!*j)
 602                                 continue;
 603                         if(neighbors.count(*j))
 604                                 continue;
 605
 606                         bool ok = true;
 607                         for(vector<MObject>::iterator k=objects.begin(); (k!=objects.end() && ok); ++k)
 608                                 ok = (k->object!=*j);
 609
 610                         if(ok)
 611                                 neighbors.insert(*j);
 612                 }
 613         }
 614 }
 615
 616 void Manipulator::set_slope(TrackOrder &track, float z, float dz)
 617 {
 618         const Vector &p = track.track->get_position();
 619         if(track.rev)
 620         {
 621                 track.track->set_position(Vector(p.x, p.y, z+dz));
 622                 track.track->set_slope(-dz);
 623         }
 624         else
 625         {
 626                 track.track->set_position(Vector(p.x, p.y, z));
 627                 track.track->set_slope(dz);
 628         }
 629 }
 630
 631 vector<Track *> Manipulator::create_straight(const R2C2::Vector &start, float dir, float length, float limit)
 632 {
 633         const Catalogue::TrackMap &track_types = designer.get_catalogue().get_tracks();
 634         std::map<float, const TrackType *> types_by_length;
 635         unsigned preference = 0;
 636         for(Catalogue::TrackMap::const_iterator i=track_types.begin(); i!=track_types.end(); ++i)
 637         {
 638                 const vector<TrackPart> &parts = i->second->get_parts();
 639                 if(parts.size()!=1)
 640                         continue;
 641                 if(parts.front().is_curved() || parts.front().is_dead_end())
 642                         continue;
 643
 644                 types_by_length[parts.front().get_length()] = i->second;
 645                 preference = max(preference, i->second->get_autofit_preference());
 646         }
 647
 648         vector<float> lengths;
 649         float removed = 0;
 650         while(length>limit)
 651         {
 652                 bool found = false;
 653                 for(map<float, const TrackType *>::iterator i=types_by_length.end(); i!=types_by_length.begin(); )
 654                 {
 655                         --i;
 656                         if(i->second->get_autofit_preference()<preference)
 657                                 continue;
 658                         if((!removed || i->first<removed) && i->first<length+limit)
 659                         {
 660                                 unsigned n = static_cast<unsigned>((length+limit)/i->first);
 661                                 lengths.insert(lengths.end(), n, i->first);
 662                                 length -= n*i->first;
 663                                 found = true;
 664                                 break;
 665                         }
 666                 }
 667
 668                 if(found)
 669                         continue;
 670
 671                 if(lengths.empty())
 672                 {
 673                         if(preference>0)
 674                         {
 675                                 --preference;
 676                                 removed = 0;
 677                                 continue;
 678                         }
 679                         break;
 680                 }
 681
 682                 length += lengths.back();
 683                 removed = lengths.back();
 684                 lengths.pop_back();
 685         }
 686
 687         vector<Track *> trks;
 688
 689         if(!lengths.empty())
 690         {
 691                 Vector pos = start;
 692                 float c = cos(dir);
 693                 float s = sin(dir);
 694                 for(vector<float>::iterator i=lengths.begin(); i!=lengths.end(); ++i)
 695                 {
 696                         Track *track = new Track(designer.get_layout(), *get_item(types_by_length, *i));
 697                         track->set_position(pos);
 698                         track->set_rotation(dir);
 699
 700                         if(!trks.empty())
 701                                 track->snap_to(*trks.back(), true);
 702                         trks.push_back(track);
 703
 704                         pos.x += c**i;
 705                         pos.y += s**i;
 706                 }
 707         }
 708
 709         return trks;
 710 }
 711
 712
 713 Manipulator::MObject::MObject(Object *o):
 714         object(o),
 715         pos(object->get_position()),
 716         rot(object->get_rotation())
 717 { }