source/designer/designer.cpp

   1 #include <signal.h>
   2 #include <algorithm>
   3 #include <cmath>
   4 #include <msp/fs/utils.h>
   5 #include <msp/gl/blend.h>
   6 #include <msp/gl/framebuffer.h>
   7 #include <msp/gl/matrix.h>
   8 #include <msp/gl/misc.h>
   9 #include <msp/gl/tests.h>
  10 #include <msp/gl/texture2d.h>
  11 #include <msp/input/keys.h>
  12 #include <msp/io/print.h>
  13 #include <msp/stringcodec/codec.h>
  14 #include <msp/stringcodec/utf8.h>
  15 #include <msp/strings/lexicalcast.h>
  16 #include <msp/strings/utils.h>
  17 #include <msp/time/units.h>
  18 #include <msp/time/utils.h>
  19 #include "libr2c2/route.h"
  20 #include "libr2c2/tracktype.h"
  21 #include "libr2c2/zone.h"
  22 #include "3d/path.h"
  23 #include "designer.h"
  24 #include "input.h"
  25 #include "layoutbar.h"
  26 #include "manipulator.h"
  27 #include "measure.h"
  28 #include "routebar.h"
  29 #include "selection.h"
  30 #include "svgexporter.h"
  31 #include "trackbar.h"
  32 #include "trackproperties.h"
  33 #include "zonebar.h"
  34 #include "zoneproperties.h"
  35
  36 using namespace std;
  37 using namespace R2C2;
  38 using namespace Msp;
  39
  40 Designer::Designer(int argc, char **argv):
  41         window(1280, 960),
  42         keyboard(window),
  43         mouse(window),
  44         ui_res("r2c2.res"),
  45         root(ui_res, &window, &keyboard, &mouse),
  46         base_object(0),
  47         cur_route(0),
  48         cur_zone(0),
  49         mode(SELECT),
  50         sel_wrap(selection),
  51         manipulator(*this, mouse, selection),
  52         measure(*this)
  53 {
  54         window.set_title("Railway Designer");
  55         window.signal_close.connect(sigc::bind(sigc::mem_fun(this, &Designer::exit), 0));
  56
  57         selection.signal_changed.connect(sigc::mem_fun(this, &Designer::selection_changed));
  58         manipulator.signal_status.connect(sigc::mem_fun(this, &Designer::manipulation_status));
  59         manipulator.signal_done.connect(sigc::mem_fun(this, &Designer::manipulation_done));
  60         measure.signal_changed.connect(sigc::mem_fun(this, &Designer::measure_changed));
  61         measure.signal_done.connect(sigc::mem_fun(this, &Designer::measure_done));
  62
  63         // Setup catalogue and layout
  64         DataFile::load(catalogue, "tracks.dat");
  65
  66         cat_layout_3d = new Layout3D(catalogue.get_layout());
  67
  68         layout = new Layout(catalogue);
  69         layout_3d = new Layout3D(*layout);
  70
  71         layout->signal_track_added.connect(sigc::mem_fun(this, &Designer::track_added));
  72         layout->signal_track_removed.connect(sigc::mem_fun(this, &Designer::track_removed));
  73
  74         if(argc>1)
  75         {
  76                 filename = argv[1];
  77                 DataFile::load(*layout, argv[1]);
  78
  79                 if(!layout->get_base().empty())
  80                 {
  81                         base_object = new GL::Object;
  82                         DataFile::load(*base_object, layout->get_base());
  83                 }
  84         }
  85
  86         // Setup OpenGL
  87         cat_view = new View3D(*cat_layout_3d, window.get_width(), window.get_height());
  88
  89         main_view = new View3D(*layout_3d, window.get_width(), window.get_height());
  90         GL::Pipeline *pipeline = &main_view->get_pipeline();
  91
  92         GL::Pipeline::Pass *pass = &pipeline->add_pass("unlit");
  93         pass->set_depth_test(&GL::DepthTest::lequal());
  94         pass->set_blend(&GL::Blend::alpha());
  95
  96         pass = &pipeline->add_pass("blended");
  97         pass->set_lighting(&layout_3d->get_lighting());
  98         pass->set_depth_test(&GL::DepthTest::lequal());
  99         pass->set_blend(&GL::Blend::alpha());
 100
 101         pass = &pipeline->add_pass("overlay");
 102         pass->set_blend(&GL::Blend::alpha());
 103
 104         if(base_object)
 105                 pipeline->add_renderable(*base_object);
 106         pipeline->add_renderable_for_pass(layout_3d->get_path_scene(), "unlit");
 107         pipeline->add_renderable_for_pass(layout_3d->get_endpoint_scene(), "unlit");
 108
 109         // Setup UI
 110         keyboard.signal_button_press.connect(sigc::bind_return(sigc::mem_fun(this, &Designer::key_press), false));
 111         mouse.signal_button_press.connect(sigc::bind_return(sigc::mem_fun(this, &Designer::button_press), false));
 112         mouse.signal_axis_motion.connect(sigc::bind_return(sigc::mem_fun(this, &Designer::axis_motion), false));
 113         root.signal_tooltip.connect(sigc::mem_fun(this, &Designer::tooltip));
 114
 115         toolbars.push_back(new Layoutbar(*this));
 116         toolbars.push_back(new Trackbar(*this));
 117         toolbars.push_back(new Routebar(*this));
 118         toolbars.push_back(new Zonebar(*this));
 119         for(vector<Toolbar *>::iterator i=toolbars.begin(); i!=toolbars.end(); ++i)
 120         {
 121                 root.add(**i);
 122                 if(i!=toolbars.begin())
 123                         (*i)->expand(false);
 124                 (*i)->signal_expanded.connect(sigc::hide(sigc::mem_fun(this, &Designer::arrange_toolbars)));
 125         }
 126         arrange_toolbars();
 127
 128         GLtk::Panel *statusbar = new GLtk::Panel;
 129         root.add(*statusbar);
 130         statusbar->set_size(window.get_width(), 20);
 131         statusbar->set_focusable(false);
 132
 133         lbl_status = new GLtk::Label;
 134         statusbar->add(*lbl_status);
 135         lbl_status->set_geometry(GLtk::Geometry(20, 2, 300, 16));
 136
 137         pipeline->add_renderable_for_pass(sel_wrap, "unlit");
 138         overlay = new Overlay3D(ui_res.get_default_font());
 139         pipeline->add_renderable_for_pass(*overlay, "overlay");
 140         pipeline->add_renderable_for_pass(measure, "unlit");
 141
 142         camera_ctl = new CameraController(*main_view, keyboard, mouse);
 143         cat_view->get_camera().set_look_direction(GL::Vector3(0, 0.13053, -0.99144));
 144         cat_view->view_all(true);
 145         main_view->view_all();
 146
 147         const Layout3D::TrackMap &tracks = layout_3d->get_tracks();
 148         for(Layout3D::TrackMap::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
 149                 update_track_icon(*i->second);
 150 }
 151
 152 Designer::~Designer()
 153 {
 154         for(vector<Toolbar *>::iterator i=toolbars.begin(); i!=toolbars.end(); ++i)
 155                 delete *i;
 156         delete camera_ctl;
 157         delete overlay;
 158         delete main_view;
 159         delete base_object;
 160         delete layout_3d;
 161         delete layout;
 162         delete cat_view;
 163         delete cat_layout_3d;
 164 }
 165
 166 int Designer::main()
 167 {
 168         window.show();
 169
 170         mode = SELECT;
 171
 172         return Application::main();
 173 }
 174
 175 void Designer::save()
 176 {
 177         InputDialog *input = new InputDialog(*this, "Save layout", filename);
 178         input->signal_accept.connect(sigc::mem_fun(layout, &Layout::save));
 179 }
 180
 181 void Designer::quit()
 182 {
 183         exit(0);
 184 }
 185
 186 void Designer::new_track()
 187 {
 188         if(mode!=SELECT)
 189                 return;
 190
 191         mode = CATALOGUE;
 192         lbl_status->set_text("Select new track or press Esc to cancel");
 193 }
 194
 195 void Designer::erase_tracks()
 196 {
 197         if(mode!=SELECT)
 198                 return;
 199
 200         set<Track *> tracks = selection.get_objects<Track>();
 201         selection.clear();
 202         for(set<Track *>::iterator i=tracks.begin(); i!=tracks.end(); ++i)
 203         {
 204                 overlay->clear(layout_3d->get_track(**i));
 205                 delete *i;
 206         }
 207 }
 208
 209 void Designer::track_properties()
 210 {
 211         if(mode!=SELECT || selection.empty())
 212                 return;
 213
 214         TrackProperties *track_prop = new TrackProperties(selection);
 215         root.add(*track_prop);
 216         const GLtk::Geometry &root_geom = root.get_geometry();
 217         const GLtk::Geometry &dlg_geom = track_prop->get_geometry();
 218         track_prop->set_position((root_geom.w-dlg_geom.w)/2, (root_geom.h-dlg_geom.h)/2);
 219
 220         track_prop->signal_response.connect(sigc::mem_fun(this, &Designer::track_properties_response));
 221 }
 222
 223 void Designer::extend_track()
 224 {
 225         if(mode!=SELECT)
 226                 return;
 227
 228         if(manipulator.start_extend())
 229                 mode = MANIPULATE;
 230 }
 231
 232 void Designer::connect_tracks()
 233 {
 234         if(mode!=SELECT)
 235                 return;
 236
 237         manipulator.connect();
 238 }
 239
 240 void Designer::flatten_tracks()
 241 {
 242         if(mode!=SELECT)
 243                 return;
 244
 245         manipulator.flatten();
 246 }
 247
 248 void Designer::svg_export()
 249 {
 250         InputDialog *input = new InputDialog(*this, "SVG export", FS::basepart(filename)+".svg");
 251         input->signal_accept.connect(sigc::mem_fun(this, &Designer::svg_export_accept));
 252 }
 253
 254 void Designer::edit_route(Route *r)
 255 {
 256         cur_route = r;
 257         cur_zone = 0;
 258         if(cur_route)
 259                 show_route(*cur_route);
 260         else
 261                 clear_paths();
 262 }
 263
 264 void Designer::rename_route()
 265 {
 266         if(mode!=SELECT || !cur_route)
 267                 return;
 268
 269         InputDialog *input = new InputDialog(*this, "Route name", cur_route->get_name());
 270         input->signal_accept.connect(sigc::mem_fun(this, &Designer::route_name_accept));
 271 }
 272
 273 void Designer::add_selection_to_route()
 274 {
 275         if(!cur_route)
 276                 return;
 277
 278         try
 279         {
 280                 cur_route->add_tracks(selection.get_objects<Track>());
 281         }
 282         catch(const exception &e)
 283         {
 284                 lbl_status->set_text(e.what());
 285         }
 286
 287         show_route(*cur_route);
 288 }
 289
 290 void Designer::edit_zone(Zone *z)
 291 {
 292         cur_zone = z;
 293         cur_route = 0;
 294         if(cur_zone)
 295                 show_zone(*cur_zone);
 296         else
 297                 clear_paths();
 298 }
 299
 300 void Designer::zone_properties()
 301 {
 302         if(!cur_zone)
 303                 return;
 304
 305         ZoneProperties *zone_prop = new ZoneProperties(*cur_zone);
 306         root.add(*zone_prop);
 307         const GLtk::Geometry &root_geom = root.get_geometry();
 308         const GLtk::Geometry &dlg_geom = zone_prop->get_geometry();
 309         zone_prop->set_position((root_geom.w-dlg_geom.w)/2, (root_geom.h-dlg_geom.h)/2);
 310 }
 311
 312 void Designer::add_selection_to_zone()
 313 {
 314         if(!cur_zone)
 315                 return;
 316
 317         try
 318         {
 319                 cur_zone->add_tracks(selection.get_objects<Track>());
 320         }
 321         catch(const exception &e)
 322         {
 323                 lbl_status->set_text(e.what());
 324         }
 325
 326         show_zone(*cur_zone);
 327 }
 328
 329 Vector Designer::map_pointer_to_ground(const Vector &p)
 330 {
 331         GL::Vector4 vec = main_view->get_camera().unproject(GL::Vector4(p.x, p.y, 0, 0));
 332         const GL::Vector3 &pos = main_view->get_camera().get_position();
 333
 334         return pos-GL::Vector3(vec.x, vec.y, vec.z)*(pos.z/vec.z);
 335 }
 336
 337 void Designer::tick()
 338 {
 339         const Msp::Time::TimeStamp t = Msp::Time::now();
 340         float dt = (t-last_tick)/Msp::Time::sec;
 341         last_tick = t;
 342
 343         if(mode==MANIPULATE_DONE)
 344                 mode = SELECT;
 345
 346         window.tick();
 347         root.tick();
 348         camera_ctl->tick(dt);
 349
 350         for(list<Track *>::iterator i=new_tracks.begin(); i!=new_tracks.end(); ++i)
 351                 layout_3d->get_track(**i).get_path().set_mask(0);
 352         new_tracks.clear();
 353
 354         render();
 355
 356         window.swap_buffers();
 357 }
 358
 359 void Designer::key_press(unsigned key)
 360 {
 361         bool shift = keyboard.get_button_state(Input::KEY_SHIFT_L) || keyboard.get_button_state(Input::KEY_SHIFT_R);
 362
 363         if(key==Msp::Input::KEY_N && shift)
 364                 extend_track();
 365         else if(key==Msp::Input::KEY_N)
 366                 new_track();
 367         else if(key==Msp::Input::KEY_G)
 368         {
 369                 manipulator.start_move();
 370                 mode = MANIPULATE;
 371         }
 372         else if(key==Msp::Input::KEY_R)
 373         {
 374                 manipulator.start_rotate();
 375                 mode = MANIPULATE;
 376         }
 377         else if(key==Msp::Input::KEY_D)
 378         {
 379                 manipulator.duplicate();
 380                 manipulator.start_move();
 381                 mode = MANIPULATE;
 382         }
 383         else if(key==Msp::Input::KEY_W)
 384                 save();
 385         else if(key==Msp::Input::KEY_PLUS)
 386                 selection.select_more();
 387         else if(key==Msp::Input::KEY_L && shift)
 388                 selection.select_blocks();
 389         else if(key==Msp::Input::KEY_L)
 390                 selection.select_linked();
 391         else if(key==Msp::Input::KEY_M)
 392         {
 393                 measure.start();
 394                 mode = MEASURE;
 395         }
 396         else if(key==Msp::Input::KEY_Z)
 397         {
 398                 manipulator.start_elevate();
 399                 mode = MANIPULATE;
 400         }
 401         else if(key==Msp::Input::KEY_ESC)
 402         {
 403                 if(mode==MANIPULATE)
 404                         manipulator.cancel();
 405                 else if(mode==CATALOGUE)
 406                         mode = SELECT;
 407                 else
 408                         selection.clear();
 409         }
 410         else if(key==Msp::Input::KEY_X)
 411                 erase_tracks();
 412         else if(key==Msp::Input::KEY_F && shift)
 413         {
 414                 const set<Track *> &tracks = selection.get_objects<Track>();
 415                 const set<Track *> &ltracks = layout->get_tracks();
 416                 for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
 417                 {
 418                         (*i)->set_flex(!(*i)->get_flex());
 419                         (*i)->break_links();
 420                         for(set<Track *>::const_iterator j=ltracks.begin(); j!=ltracks.end(); ++j)
 421                                 if(*j!=*i)
 422                                         (*i)->snap_to(**j, true);
 423
 424                         update_track_icon(layout_3d->get_track(**i));
 425                 }
 426         }
 427         else if(key==Msp::Input::KEY_F)
 428                 flatten_tracks();
 429         else if(key==Msp::Input::KEY_E && shift)
 430                 manipulator.even_slope(true);
 431         else if(key==Msp::Input::KEY_E)
 432                 manipulator.even_slope();
 433         else if(key==Msp::Input::KEY_A)
 434         {
 435                 if(cur_route)
 436                         add_selection_to_route();
 437                 else if(cur_zone)
 438                         add_selection_to_zone();
 439         }
 440         else if(key==Msp::Input::KEY_C)
 441                 connect_tracks();
 442         else if(key==Msp::Input::KEY_V)
 443                 svg_export();
 444         else if(key==Msp::Input::KEY_P)
 445                 track_properties();
 446 }
 447
 448 void Designer::button_press(unsigned btn)
 449 {
 450         bool shift = keyboard.get_button_state(Input::KEY_SHIFT_L) || keyboard.get_button_state(Input::KEY_SHIFT_R);
 451
 452         Vector pointer(mouse.get_axis_value(0), mouse.get_axis_value(1), 0);
 453         Vector ground = map_pointer_to_ground(pointer);
 454
 455         if(mode==CATALOGUE)
 456         {
 457                 if(btn==1)
 458                 {
 459                         Object *cobj = pick_object(pointer);
 460                         if(cobj)
 461                         {
 462                                 Object *obj = cobj->clone(layout);
 463                                 obj->set_position(ground);
 464
 465                                 selection.clear();
 466                                 selection.add_object(obj);
 467
 468                                 mode = SELECT;
 469                         }
 470                 }
 471                 else
 472                         mode = SELECT;
 473         }
 474         else if(mode==SELECT)
 475         {
 476                 if(btn==1)
 477                 {
 478                         Object *obj = pick_object(pointer);
 479                         if(obj)
 480                         {
 481                                 if(!shift)
 482                                         selection.clear();
 483                                 selection.toggle_object(obj);
 484                         }
 485                 }
 486         }
 487         else if(mode==MEASURE)
 488                 measure.button_press(ground.x, ground.y, btn);
 489 }
 490
 491 void Designer::axis_motion(unsigned, float, float)
 492 {
 493         Vector pointer(mouse.get_axis_value(0), mouse.get_axis_value(1), 0);
 494         float wx = pointer.x*window.get_width();
 495         float wy = pointer.y*window.get_height();
 496
 497         if(!root.get_child_at(wx, wy))
 498         {
 499                 Vector ground = map_pointer_to_ground(pointer);
 500                 measure.pointer_motion(ground.x, ground.y);
 501         }
 502 }
 503
 504 void Designer::render()
 505 {
 506         GL::Framebuffer::system().clear(GL::COLOR_BUFFER_BIT|GL::DEPTH_BUFFER_BIT);
 507
 508         View3D *view = (mode==CATALOGUE ? cat_view : main_view);
 509         view->render();
 510
 511         root.render();
 512         // XXX Should fix GLtk so this would not be needed
 513         glColor3f(1.0, 1.0, 1.0);
 514 }
 515
 516 void Designer::track_added(Track &trk)
 517 {
 518         new_tracks.push_back(&trk);
 519 }
 520
 521 void Designer::track_removed(Track &trk)
 522 {
 523         list<Track *>::iterator i = find(new_tracks.begin(), new_tracks.end(), &trk);
 524         if(i!=new_tracks.end())
 525                 new_tracks.erase(i);
 526 }
 527
 528 Object *Designer::pick_object(const Vector &pointer)
 529 {
 530         View3D &view = *(mode==CATALOGUE ? cat_view : main_view);
 531         const GL::Vector3 &cpos = view.get_camera().get_position();
 532         GL::Vector4 cray = view.get_camera().unproject(GL::Vector4(pointer.x, pointer.y, 0, 0));
 533
 534         return view.get_layout().get_layout().pick_object(Ray(cpos, Vector(cray)));
 535 }
 536
 537 void Designer::update_track_icon(Track3D &track)
 538 {
 539         overlay->clear(track);
 540
 541         if(track.get_track().get_flex())
 542                 overlay->add_graphic(track, "flex");
 543
 544         if(unsigned sid = track.get_track().get_sensor_id())
 545         {
 546                 overlay->add_graphic(track, "sensor");
 547                 overlay->set_label(track, lexical_cast<string>(sid));
 548         }
 549         else if(unsigned tid = track.get_track().get_turnout_id())
 550         {
 551                 if(tid<0x800)
 552                 {
 553                         overlay->add_graphic(track, "turnout");
 554                         overlay->set_label(track, lexical_cast<string>(tid));
 555                 }
 556         }
 557 }
 558
 559 void Designer::selection_changed()
 560 {
 561         const set<Track *> &tracks = selection.get_objects<Track>();
 562         if(tracks.empty())
 563                 lbl_status->set_text(string());
 564         else
 565         {
 566                 float len = 0;
 567                 for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
 568                         len += (*i)->get_type().get_total_length();
 569                 lbl_status->set_text(format("%.2fm of track selected\n", len));
 570         }
 571 }
 572
 573 void Designer::manipulation_status(const string &status)
 574 {
 575         lbl_status->set_text(status);
 576 }
 577
 578 void Designer::manipulation_done(bool)
 579 {
 580         mode = MANIPULATE_DONE;
 581         selection_changed();
 582 }
 583
 584 void Designer::measure_changed()
 585 {
 586         float pard = measure.get_parallel_distance()*1000;
 587         float perpd = measure.get_perpendicular_distance()*1000;
 588         float d = sqrt(pard*pard+perpd*perpd);
 589         const Angle &adiff = measure.get_angle_difference();
 590         string info = format("Par %.1fmm - Perp %.1fmm - Total %.1fmm - Angle %.1f°", pard, perpd, d, adiff.degrees());
 591         lbl_status->set_text(info);
 592 }
 593
 594 void Designer::measure_done()
 595 {
 596         mode = SELECT;
 597         selection_changed();
 598 }
 599
 600 void Designer::arrange_toolbars()
 601 {
 602         unsigned x = 0;
 603         for(vector<Toolbar *>::iterator i=toolbars.begin(); i!=toolbars.end(); ++i)
 604         {
 605                 const GLtk::Geometry &geom = (*i)->get_geometry();
 606                 (*i)->set_position(x, window.get_height()-geom.h);
 607                 x += geom.w;
 608         }
 609 }
 610
 611 void Designer::track_properties_response(int)
 612 {
 613         const set<Track *> &tracks = selection.get_objects<Track>();
 614         for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
 615                 update_track_icon(layout_3d->get_track(**i));
 616 }
 617
 618 void Designer::route_name_accept(const string &text)
 619 {
 620         if(cur_route)
 621                 cur_route->set_name(text);
 622 }
 623
 624 void Designer::svg_export_accept(const string &text)
 625 {
 626         SvgExporter svg_exp(*layout);
 627         svg_exp.save(text);
 628 }
 629
 630 string Designer::tooltip(int x, int y)
 631 {
 632         if(Object *obj = pick_object(Vector(x*2.0f/window.get_width()-1.0f, y*2.0f/window.get_height()-1.0f, 0)))
 633         {
 634                 const ObjectType &otype = obj->get_type();
 635                 string info = format("%d %s", otype.get_article_number(), otype.get_description());
 636                 if(Track *track = dynamic_cast<Track *>(obj))
 637                 {
 638                         const TrackType &ttype = track->get_type();
 639                         if(mode!=CATALOGUE && abs(track->get_slope())>1e-4)
 640                                 info += format(" (slope %.1f%%)", abs(track->get_slope()/ttype.get_total_length()*100));
 641                         if(track->get_turnout_id())
 642                                 info += format(" (turnout %d)", track->get_turnout_id());
 643                         else if(track->get_sensor_id())
 644                                 info += format(" (sensor %d)", track->get_sensor_id());
 645                 }
 646                 return info;
 647         }
 648
 649         return string();
 650 }
 651
 652 void Designer::clear_paths()
 653 {
 654         const set<Track *> &ltracks = layout->get_tracks();
 655         for(set<Track *>::iterator i=ltracks.begin(); i!=ltracks.end(); ++i)
 656         {
 657                 Track3D &t3d = layout_3d->get_track(**i);
 658                 t3d.get_path().set_mask(0);
 659         }
 660 }
 661
 662 void Designer::show_route(const Route &route)
 663 {
 664         clear_paths();
 665
 666         const set<Track *> &rtracks = route.get_tracks();
 667         for(set<Track *>::iterator i=rtracks.begin(); i!=rtracks.end(); ++i)
 668         {
 669                 Track3D &t3d = layout_3d->get_track(**i);
 670                 t3d.get_path().set_color(GL::Color(0.5, 0.8, 1.0));
 671                 int path = -1;
 672                 if(unsigned tid = (*i)->get_turnout_id())
 673                         path = route.get_turnout(tid);
 674                 if(path>=0)
 675                         t3d.get_path().set_path(path);
 676                 else
 677                         t3d.get_path().set_mask((*i)->get_type().get_paths());
 678         }
 679 }
 680
 681 void Designer::show_zone(const Zone &zone)
 682 {
 683         clear_paths();
 684
 685         const Zone::TrackSet &ztracks = zone.get_tracks();
 686         for(Zone::TrackSet::const_iterator i=ztracks.begin(); i!=ztracks.end(); ++i)
 687         {
 688                 Track3D &t3d = layout_3d->get_track(**i);
 689                 t3d.get_path().set_color(GL::Color(0.8, 1.0, 0.5));
 690                 t3d.get_path().set_mask((*i)->get_type().get_paths());
 691         }
 692 }