synfig-core/trunk/src/synfig/valuenode.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file valuenode.cpp
   3 **      \brief Implementation of the "Placeholder" valuenode conversion.
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007, 2008 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 */
  22 /* ========================================================================= */
  23
  24 /* === H E A D E R S ======================================================= */
  25
  26 #define SYNFIG_NO_ANGLE
  27
  28 //#define HAS_HASH_MAP 1
  29
  30 #ifdef USING_PCH
  31 #       include "pch.h"
  32 #else
  33 #ifdef HAVE_CONFIG_H
  34 #       include <config.h>
  35 #endif
  36
  37 #include "valuenode.h"
  38 #include "general.h"
  39 #include "canvas.h"
  40 #include "paramdesc.h"
  41 #include "releases.h"
  42
  43 #include "valuenode_const.h"
  44 #include "valuenode_linear.h"
  45 #include "valuenode_composite.h"
  46 #include "valuenode_reference.h"
  47 #include "valuenode_scale.h"
  48 #include "valuenode_blinecalctangent.h"
  49 #include "valuenode_blinecalcvertex.h"
  50 #include "valuenode_blinecalcwidth.h"
  51 #include "valuenode_blinereversetangent.h"
  52 #include "valuenode_segcalctangent.h"
  53 #include "valuenode_segcalcvertex.h"
  54 #include "valuenode_repeat_gradient.h"
  55 #include "valuenode_stripes.h"
  56 #include "valuenode_range.h"
  57 #include "valuenode_add.h"
  58 #include "valuenode_subtract.h"
  59 #include "valuenode_timedswap.h"
  60 #include "valuenode_twotone.h"
  61 #include "valuenode_bline.h"
  62 #include "valuenode_dynamiclist.h"
  63 #include "valuenode_radialcomposite.h"
  64 #include "valuenode_gradientrotate.h"
  65 #include "valuenode_sine.h"
  66 #include "valuenode_cos.h"
  67 #include "valuenode_atan2.h"
  68 #include "valuenode_exp.h"
  69 #include "valuenode_switch.h"
  70 #include "valuenode_timeloop.h"
  71 #include "valuenode_reciprocal.h"
  72 #include "valuenode_duplicate.h"
  73 #include "valuenode_integer.h"
  74 #include "valuenode_step.h"
  75 #include "valuenode_vectorangle.h"
  76 #include "valuenode_vectorlength.h"
  77 #include "valuenode_vectorx.h"
  78 #include "valuenode_vectory.h"
  79 #include "valuenode_gradientcolor.h"
  80 #include "valuenode_dotproduct.h"
  81 #include "valuenode_timestring.h"
  82 #include "valuenode_realstring.h"
  83 #include "valuenode_join.h"
  84 #include "valuenode_anglestring.h"
  85 #include "valuenode_intstring.h"
  86 #include "valuenode_log.h"
  87
  88 #include "layer.h"
  89
  90 #endif
  91
  92 /* === U S I N G =========================================================== */
  93
  94 using namespace std;
  95 using namespace etl;
  96 using namespace synfig;
  97
  98 /* === M A C R O S ========================================================= */
  99
 100 /* === G L O B A L S ======================================================= */
 101
 102 static int value_node_count(0);
 103
 104 static LinkableValueNode::Book *book_;
 105
 106
 107 ValueNode::LooseHandle
 108 synfig::find_value_node(const GUID& guid)
 109 {
 110         return guid_cast<ValueNode>(guid);
 111 }
 112
 113 /* === P R O C E D U R E S ================================================= */
 114
 115 /* === M E T H O D S ======================================================= */
 116
 117 bool
 118 ValueNode::subsys_init()
 119 {
 120         book_=new LinkableValueNode::Book();
 121
 122 #define ADD_VALUENODE(class,name,local,version)                                                                                                 \
 123         (*book_)[name].factory=reinterpret_cast<LinkableValueNode::Factory>(&class::create);            \
 124         (*book_)[name].check_type=&class::check_type;                                                                                           \
 125         (*book_)[name].local_name=local;                                                                                                                        \
 126         (*book_)[name].release_version=version
 127
 128 #define ADD_VALUENODE2(class,name,local,version)                                                                                                \
 129         (*book_)[name].factory=reinterpret_cast<LinkableValueNode::Factory>(&class::create_from);       \
 130         (*book_)[name].check_type=&class::check_type;                                                                                           \
 131         (*book_)[name].local_name=local;                                                                                                                        \
 132         (*book_)[name].release_version=version
 133
 134         ADD_VALUENODE(ValueNode_Linear,                   "linear",                       _("Linear"),                   RELEASE_VERSION_0_61_06);
 135         ADD_VALUENODE(ValueNode_Composite,                "composite",            _("Composite"),                RELEASE_VERSION_0_61_06);
 136         ADD_VALUENODE(ValueNode_RadialComposite,  "radial_composite", _("Radial Composite"), RELEASE_VERSION_0_61_06);
 137         ADD_VALUENODE(ValueNode_Reference,                "reference",            _("Reference"),                RELEASE_VERSION_0_61_06);
 138         ADD_VALUENODE(ValueNode_Scale,                    "scale",                        _("Scale"),                    RELEASE_VERSION_0_61_06);
 139         ADD_VALUENODE(ValueNode_SegCalcTangent,   "segcalctangent",       _("Segment Tangent"),  RELEASE_VERSION_0_61_06);
 140         ADD_VALUENODE(ValueNode_SegCalcVertex,    "segcalcvertex",        _("Segment Vertex"),   RELEASE_VERSION_0_61_06);
 141         ADD_VALUENODE(ValueNode_Stripes,                  "stripes",              _("Stripes"),                  RELEASE_VERSION_0_61_06);
 142         ADD_VALUENODE(ValueNode_Subtract,                 "subtract",             _("Subtract"),                 RELEASE_VERSION_0_61_06);
 143         ADD_VALUENODE(ValueNode_TwoTone,                  "twotone",              _("Two-Tone"),                 RELEASE_VERSION_0_61_06);
 144         ADD_VALUENODE(ValueNode_BLine,                    "bline",                        _("BLine"),                    RELEASE_VERSION_0_61_06);
 145         ADD_VALUENODE2(ValueNode_DynamicList,     "dynamic_list",         _("Dynamic List"),     RELEASE_VERSION_0_61_06);
 146         ADD_VALUENODE(ValueNode_GradientRotate,   "gradient_rotate",  _("Gradient Rotate"),      RELEASE_VERSION_0_61_06);
 147         ADD_VALUENODE(ValueNode_Sine,                     "sine",                         _("Sine"),                     RELEASE_VERSION_0_61_06);
 148
 149         ADD_VALUENODE(ValueNode_TimedSwap,                "timed_swap",           _("Timed Swap"),               RELEASE_VERSION_0_61_07); // SVN r610
 150         ADD_VALUENODE(ValueNode_Repeat_Gradient,  "repeat_gradient",  _("Repeat Gradient"),      RELEASE_VERSION_0_61_07); // SVN r666
 151         ADD_VALUENODE(ValueNode_Exp,                      "exp",                          _("Exponential"),              RELEASE_VERSION_0_61_07); // SVN r739
 152         ADD_VALUENODE(ValueNode_Add,                      "add",                          _("Add"),                              RELEASE_VERSION_0_61_07); // SVN r742
 153         ADD_VALUENODE(ValueNode_BLineCalcTangent, "blinecalctangent", _("BLine Tangent"),        RELEASE_VERSION_0_61_07); // SVN r744
 154         ADD_VALUENODE(ValueNode_BLineCalcVertex,  "blinecalcvertex",  _("BLine Vertex"),         RELEASE_VERSION_0_61_07); // SVN r744
 155         ADD_VALUENODE(ValueNode_Range,                    "range",                        _("Range"),                    RELEASE_VERSION_0_61_07); // SVN r776
 156
 157         ADD_VALUENODE(ValueNode_Switch,                   "switch",                       _("Switch"),                   RELEASE_VERSION_0_61_08); // SVN r923
 158         ADD_VALUENODE(ValueNode_Cos,                      "cos",                          _("Cos"),                              RELEASE_VERSION_0_61_08); // SVN r1111
 159         ADD_VALUENODE(ValueNode_Atan2,                    "atan2",                        _("aTan2"),                    RELEASE_VERSION_0_61_08); // SVN r1132
 160         ADD_VALUENODE(ValueNode_BLineRevTangent,  "blinerevtangent",  _("Reverse Tangent"),      RELEASE_VERSION_0_61_08); // SVN r1162
 161         ADD_VALUENODE(ValueNode_TimeLoop,                 "timeloop",             _("Time Loop"),                RELEASE_VERSION_0_61_08); // SVN r1226
 162         ADD_VALUENODE(ValueNode_Reciprocal,               "reciprocal",           _("Reciprocal"),               RELEASE_VERSION_0_61_08); // SVN r1238
 163         ADD_VALUENODE(ValueNode_Duplicate,                "duplicate",            _("Duplicate"),                RELEASE_VERSION_0_61_08); // SVN r1267
 164         ADD_VALUENODE(ValueNode_Integer,                  "fromint",              _("From Integer"),     RELEASE_VERSION_0_61_08); // SVN r1267
 165         ADD_VALUENODE(ValueNode_Step,                     "step",                         _("Step"),                     RELEASE_VERSION_0_61_08); // SVN r1691
 166         ADD_VALUENODE(ValueNode_BLineCalcWidth,   "blinecalcwidth",       _("BLine Width"),              RELEASE_VERSION_0_61_08); // SVN r1694
 167
 168         ADD_VALUENODE(ValueNode_VectorAngle,      "vectorangle",          _("Vector Angle"),     RELEASE_VERSION_0_61_09); // SVN r1880
 169         ADD_VALUENODE(ValueNode_VectorLength,     "vectorlength",         _("Vector Length"),    RELEASE_VERSION_0_61_09); // SVN r1881
 170         ADD_VALUENODE(ValueNode_VectorX,                  "vectorx",              _("Vector X"),                 RELEASE_VERSION_0_61_09); // SVN r1882
 171         ADD_VALUENODE(ValueNode_VectorY,                  "vectory",              _("Vector Y"),                 RELEASE_VERSION_0_61_09); // SVN r1882
 172         ADD_VALUENODE(ValueNode_GradientColor,    "gradientcolor",        _("Gradient Color"),   RELEASE_VERSION_0_61_09); // SVN r1885
 173         ADD_VALUENODE(ValueNode_DotProduct,               "dotproduct",           _("Dot Product"),              RELEASE_VERSION_0_61_09); // SVN r1891
 174         ADD_VALUENODE(ValueNode_TimeString,               "timestring",           _("Time String"),              RELEASE_VERSION_0_61_09); // SVN r2000
 175         ADD_VALUENODE(ValueNode_RealString,               "realstring",           _("Real String"),              RELEASE_VERSION_0_61_09); // SVN r2003
 176         ADD_VALUENODE(ValueNode_Join,                     "join",                         _("Joined List"),              RELEASE_VERSION_0_61_09); // SVN r2007
 177         ADD_VALUENODE(ValueNode_AngleString,      "anglestring",          _("Angle String"),     RELEASE_VERSION_0_61_09); // SVN r2010
 178         ADD_VALUENODE(ValueNode_IntString,                "intstring",            _("Int String"),               RELEASE_VERSION_0_61_09); // SVN r2010
 179         ADD_VALUENODE(ValueNode_Logarithm,                "logarithm",            _("Logarithm"),                RELEASE_VERSION_0_61_09); // SVN r2034
 180
 181 #undef ADD_VALUENODE
 182 #undef ADD_VALUENODE2
 183
 184         return true;
 185 }
 186
 187 bool
 188 ValueNode::subsys_stop()
 189 {
 190         delete book_;
 191 /*      if(global_value_node_map.size() || value_node_count)
 192         {
 193                 if(value_node_count)
 194                         synfig::error("%d ValueNodes haven't been destroyed yet!",value_node_count);
 195
 196                 if(global_value_node_map.size()!=value_node_count)
 197                         synfig::error("value node count mismatch! map.size()!=value_node_count (%d!=%d)",global_value_node_map.size(),value_node_count);
 198
 199                 GlobalValueNodeMap::iterator iter;
 200                 for(iter=global_value_node_map.begin();iter!=global_value_node_map.end();++iter)
 201                 {
 202                         if(!iter->second->is_exported())
 203                                 synfig::info(_("%s: count:%d name:%s type:%s"),
 204                                         iter->first.get_string().c_str(),
 205                                         iter->second->count(),
 206                                         iter->second->get_name().c_str(),
 207                                         ValueBase::type_local_name(iter->second->get_type()).c_str()
 208                                 );
 209                         else
 210                                 synfig::info(_("%s: id:%s count:%d name:%s type:%s"),
 211                                         iter->first.get_string().c_str(),
 212                                         iter->second->get_id().c_str(),
 213                                         iter->second->count(),
 214                                         iter->second->get_name().c_str(),
 215                                         ValueBase::type_local_name(iter->second->get_type()).c_str()
 216                                 );
 217                 }
 218         }
 219 */
 220         return true;
 221 }
 222
 223 ValueNode::ValueNode(ValueBase::Type type):type(type)
 224 {
 225         value_node_count++;
 226 }
 227
 228 LinkableValueNode::Book&
 229 LinkableValueNode::book()
 230 {
 231         return *book_;
 232 }
 233
 234 LinkableValueNode::Handle
 235 LinkableValueNode::create(const String &name, const ValueBase& x)
 236 {
 237         if(!book().count(name))
 238                 return 0;
 239
 240         if (!check_type(name, x.get_type()) &&
 241                 // the Duplicate ValueNode is an exception - we don't want the
 242                 // user creating it for themselves, so check_type() fails for
 243                 // it even when it is valid
 244                 !(name == "duplicate" && x.get_type() == ValueBase::TYPE_REAL))
 245         {
 246                 error(_("Bad type: ValueNode '%s' doesn't accept type '%s'"), book()[name].local_name.c_str(), ValueBase::type_local_name(x.get_type()).c_str());
 247                 return 0;
 248         }
 249
 250         return book()[name].factory(x);
 251 }
 252
 253 bool
 254 LinkableValueNode::check_type(const String &name, ValueBase::Type x)
 255 {
 256         if(!book().count(name) || !book()[name].check_type)
 257                 return false;
 258         return book()[name].check_type(x);
 259 }
 260
 261 bool
 262 LinkableValueNode::set_link(int i,ValueNode::Handle x)
 263 {
 264         ValueNode::Handle previous(get_link(i));
 265
 266         if(set_link_vfunc(i,x))
 267         {
 268                 if(previous)
 269                         remove_child(previous.get());
 270                 add_child(x.get());
 271
 272                 if(!x->is_exported() && get_parent_canvas())
 273                 {
 274                         x->set_parent_canvas(get_parent_canvas());
 275                 }
 276                 changed();
 277                 return true;
 278         }
 279         return false;
 280 }
 281
 282 ValueNode::LooseHandle
 283 LinkableValueNode::get_link(int i)const
 284 {
 285         return get_link_vfunc(i);
 286 }
 287
 288 void
 289 LinkableValueNode::unlink_all()
 290 {
 291         for(int i=0;i<link_count();i++)
 292         {
 293                 ValueNode::LooseHandle value_node(get_link(i));
 294                 if(value_node)
 295                         value_node->parent_set.erase(this);
 296         }
 297 }
 298
 299 ValueNode::~ValueNode()
 300 {
 301         value_node_count--;
 302
 303         begin_delete();
 304 }
 305
 306 void
 307 ValueNode::on_changed()
 308 {
 309         etl::loose_handle<Canvas> parent_canvas = get_parent_canvas();
 310         if(parent_canvas)
 311                 do                                              // signal to all the ancestor canvases
 312                         parent_canvas->signal_value_node_changed()(this);
 313                 while (parent_canvas = parent_canvas->parent());
 314         else if(get_root_canvas())
 315                 get_root_canvas()->signal_value_node_changed()(this);
 316
 317         Node::on_changed();
 318 }
 319
 320 int
 321 ValueNode::replace(etl::handle<ValueNode> x)
 322 {
 323         if(x.get()==this)
 324                 return 0;
 325
 326         while(parent_set.size())
 327         {
 328                 (*parent_set.begin())->add_child(x.get());
 329                 (*parent_set.begin())->remove_child(this);
 330                 //x->parent_set.insert(*parent_set.begin());
 331                 //parent_set.erase(parent_set.begin());
 332         }
 333         int r(RHandle(this).replace(x));
 334         x->changed();
 335         return r;
 336 }
 337
 338 void
 339 ValueNode::set_id(const String &x)
 340 {
 341         if(name!=x)
 342         {
 343                 name=x;
 344                 signal_id_changed_();
 345         }
 346 }
 347
 348 String
 349 ValueNode::get_description(bool show_exported_name)const
 350 {
 351         String ret(_("ValueNode"));
 352
 353         if (dynamic_cast<const LinkableValueNode*>(this))
 354                 return (dynamic_cast<const LinkableValueNode*>(this))->get_description(-1, show_exported_name);
 355
 356         if (show_exported_name && !is_exported())
 357                 show_exported_name = false;
 358
 359         if (show_exported_name)
 360                 ret += strprintf(" (%s)", get_id().c_str());
 361
 362         return ret;
 363 }
 364
 365 ValueNodeList::ValueNodeList():
 366         placeholder_count_(0)
 367 {
 368 }
 369
 370 bool
 371 ValueNodeList::count(const String &id)const
 372 {
 373         const_iterator iter;
 374
 375         if(id.empty())
 376                 return false;
 377
 378         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 379                 ;
 380
 381         if(iter==end())
 382                 return false;
 383
 384         return true;
 385 }
 386
 387 ValueNode::Handle
 388 ValueNodeList::find(const String &id)
 389 {
 390         iterator iter;
 391
 392         if(id.empty())
 393                 throw Exception::IDNotFound("Empty ID");
 394
 395         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 396                 ;
 397
 398         if(iter==end())
 399                 throw Exception::IDNotFound("ValueNode in ValueNodeList: "+id);
 400
 401         return *iter;
 402 }
 403
 404 ValueNode::ConstHandle
 405 ValueNodeList::find(const String &id)const
 406 {
 407         const_iterator iter;
 408
 409         if(id.empty())
 410                 throw Exception::IDNotFound("Empty ID");
 411
 412         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 413                 ;
 414
 415         if(iter==end())
 416                 throw Exception::IDNotFound("ValueNode in ValueNodeList: "+id);
 417
 418         return *iter;
 419 }
 420
 421 ValueNode::Handle
 422 ValueNodeList::surefind(const String &id)
 423 {
 424         if(id.empty())
 425                 throw Exception::IDNotFound("Empty ID");
 426
 427         ValueNode::Handle value_node;
 428
 429         try
 430         {
 431                 value_node=find(id);
 432         }
 433         catch(Exception::IDNotFound)
 434         {
 435                 value_node=PlaceholderValueNode::create();
 436                 value_node->set_id(id);
 437                 push_back(value_node);
 438                 placeholder_count_++;
 439         }
 440
 441         return value_node;
 442 }
 443
 444 bool
 445 ValueNodeList::erase(ValueNode::Handle value_node)
 446 {
 447         assert(value_node);
 448
 449         iterator iter;
 450
 451         for(iter=begin();iter!=end();++iter)
 452                 if(value_node.get()==iter->get())
 453                 {
 454                         std::list<ValueNode::RHandle>::erase(iter);
 455                         if(PlaceholderValueNode::Handle::cast_dynamic(value_node))
 456                                 placeholder_count_--;
 457                         return true;
 458                 }
 459         return false;
 460 }
 461
 462 bool
 463 ValueNodeList::add(ValueNode::Handle value_node)
 464 {
 465         if(!value_node)
 466                 return false;
 467         if(value_node->get_id().empty())
 468                 return false;
 469
 470         try
 471         {
 472                 ValueNode::RHandle other_value_node=find(value_node->get_id());
 473                 if(PlaceholderValueNode::Handle::cast_dynamic(other_value_node))
 474                 {
 475                         other_value_node->replace(value_node);
 476                         placeholder_count_--;
 477                         return true;
 478                 }
 479
 480                 return false;
 481         }
 482         catch(Exception::IDNotFound)
 483         {
 484                 push_back(value_node);
 485                 return true;
 486         }
 487
 488         return false;
 489 }
 490
 491 void
 492 ValueNodeList::audit()
 493 {
 494         iterator iter,next;
 495
 496         for(next=begin(),iter=next++;iter!=end();iter=next++)
 497                 if(iter->count()==1)
 498                         std::list<ValueNode::RHandle>::erase(iter);
 499 }
 500
 501
 502 String
 503 PlaceholderValueNode::get_name()const
 504 {
 505         return "placeholder";
 506 }
 507
 508 String
 509 PlaceholderValueNode::get_local_name()const
 510 {
 511         return _("Placeholder");
 512 }
 513
 514 ValueNode*
 515 PlaceholderValueNode::clone(const GUID& deriv_guid)const
 516 {
 517         ValueNode* ret(new PlaceholderValueNode());
 518         ret->set_guid(get_guid()^deriv_guid);
 519         return ret;
 520 }
 521
 522 PlaceholderValueNode::Handle
 523 PlaceholderValueNode::create(ValueBase::Type type)
 524 {
 525         return new PlaceholderValueNode(type);
 526 }
 527
 528 ValueBase
 529 PlaceholderValueNode::operator()(Time /*t*/)const
 530 {
 531         assert(0);
 532         return ValueBase();
 533 }
 534
 535 PlaceholderValueNode::PlaceholderValueNode(ValueBase::Type type):
 536         ValueNode(type)
 537 {
 538 }
 539
 540 ValueNode*
 541 LinkableValueNode::clone(const GUID& deriv_guid)const
 542 {
 543         {
 544                 ValueNode* x(find_value_node(get_guid()^deriv_guid).get());
 545                 if(x)
 546                         return x;
 547         }
 548
 549         int i;
 550         LinkableValueNode *ret=create_new();
 551         ret->set_guid(get_guid()^deriv_guid);
 552
 553         for(i=0;i<link_count();i++)
 554         {
 555                 ValueNode::Handle link=get_link_vfunc(i);
 556                 if(!link->is_exported())
 557                 {
 558                         ValueNode::LooseHandle value_node(find_value_node(link->get_guid()^deriv_guid));
 559                         if(!value_node)
 560                                 value_node=link->clone(deriv_guid);
 561                         ret->set_link(i,value_node);
 562                 }
 563                 else
 564                         ret->set_link(i,link);
 565         }
 566
 567         return ret;
 568 }
 569
 570 String
 571 ValueNode::get_relative_id(etl::loose_handle<const Canvas> x)const
 572 {
 573         assert(is_exported());
 574         assert(canvas_);
 575
 576         if(x.get()==canvas_.get())
 577                 return get_id();
 578
 579         return canvas_->_get_relative_id(x)+':'+get_id();
 580 }
 581
 582 void
 583 ValueNode::set_parent_canvas(etl::loose_handle<Canvas> x)
 584 {
 585         canvas_=x; if(x) root_canvas_=x->get_root();
 586 }
 587
 588 void
 589 ValueNode::set_root_canvas(etl::loose_handle<Canvas> x)
 590 {
 591         root_canvas_=x->get_root();
 592 }
 593
 594 void LinkableValueNode::get_times_vfunc(Node::time_set &set) const
 595 {
 596         ValueNode::LooseHandle  h;
 597
 598         int size = link_count();
 599
 600         //just add it to the set...
 601         for(int i=0; i < size; ++i)
 602         {
 603                 h = get_link(i);
 604
 605                 if(h)
 606                 {
 607                         const Node::time_set &tset = h->get_times();
 608                         set.insert(tset.begin(),tset.end());
 609                 }
 610         }
 611 }
 612
 613 String
 614 LinkableValueNode::get_description(int index, bool show_exported_name)const
 615 {
 616         String description;
 617
 618         if (index == -1)
 619         {
 620                 if (show_exported_name && is_exported())
 621                         description += strprintf(" (%s)", get_id().c_str());
 622         }
 623         else
 624         {
 625                 description = String(":") + link_local_name(index);
 626
 627                 if (show_exported_name)
 628                 {
 629                         ValueNode::LooseHandle link(get_link(index));
 630                         if (link->is_exported())
 631                                 description += strprintf(" (%s)", link->get_id().c_str());
 632                 }
 633         }
 634
 635         const synfig::Node* node = this;
 636         LinkableValueNode::ConstHandle parent_linkable_vn = 0;
 637
 638         // walk up through the valuenodes trying to find the layer at the top
 639         while (!node->parent_set.empty() && !dynamic_cast<const Layer*>(node))
 640         {
 641                 LinkableValueNode::ConstHandle linkable_value_node(dynamic_cast<const LinkableValueNode*>(node));
 642                 if (linkable_value_node)
 643                 {
 644                         String link;
 645                         int cnt = linkable_value_node->link_count();
 646                         for (int i = 0; i < cnt; i++)
 647                                 if (linkable_value_node->get_link(i) == parent_linkable_vn)
 648                                 {
 649                                         link = String(":") + linkable_value_node->link_local_name(i);
 650                                         break;
 651                                 }
 652
 653                         description = linkable_value_node->get_local_name() + link + (parent_linkable_vn?">":"") + description;
 654                 }
 655                 node = *node->parent_set.begin();
 656                 parent_linkable_vn = linkable_value_node;
 657         }
 658
 659         Layer::ConstHandle parent_layer(dynamic_cast<const Layer*>(node));
 660         if(parent_layer)
 661         {
 662                 String param;
 663                 const Layer::DynamicParamList &dynamic_param_list(parent_layer->dynamic_param_list());
 664                 // loop to find the parameter in the dynamic parameter list - this gives us its name
 665                 for (Layer::DynamicParamList::const_iterator iter = dynamic_param_list.begin(); iter != dynamic_param_list.end(); iter++)
 666                         if (iter->second == parent_linkable_vn)
 667                                 param = String(":") + parent_layer->get_param_local_name(iter->first);
 668                 description = strprintf("(%s)%s>%s",
 669                                                                 parent_layer->get_non_empty_description().c_str(),
 670                                                                 param.c_str(),
 671                                                                 description.c_str());
 672         }
 673
 674         return description;
 675 }