synfig-core/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 **  Copyright (c) 2008 Carlos López
  11 **
  12 **      This package is free software; you can redistribute it and/or
  13 **      modify it under the terms of the GNU General Public License as
  14 **      published by the Free Software Foundation; either version 2 of
  15 **      the License, or (at your option) any later version.
  16 **
  17 **      This package is distributed in the hope that it will be useful,
  18 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  20 **      General Public License for more details.
  21 **      \endlegal
  22 */
  23 /* ========================================================================= */
  24
  25 /* === H E A D E R S ======================================================= */
  26
  27 #define SYNFIG_NO_ANGLE
  28
  29 //#define HAS_HASH_MAP 1
  30
  31 #ifdef USING_PCH
  32 #       include "pch.h"
  33 #else
  34 #ifdef HAVE_CONFIG_H
  35 #       include <config.h>
  36 #endif
  37
  38 #include "valuenode.h"
  39 #include "general.h"
  40 #include "canvas.h"
  41 #include "paramdesc.h"
  42 #include "releases.h"
  43
  44 #include "valuenode_const.h"
  45 #include "valuenode_linear.h"
  46 #include "valuenode_composite.h"
  47 #include "valuenode_reference.h"
  48 #include "valuenode_greyed.h"
  49 #include "valuenode_scale.h"
  50 #include "valuenode_blinecalctangent.h"
  51 #include "valuenode_blinecalcvertex.h"
  52 #include "valuenode_blinecalcwidth.h"
  53 #include "valuenode_blinereversetangent.h"
  54 #include "valuenode_segcalctangent.h"
  55 #include "valuenode_segcalcvertex.h"
  56 #include "valuenode_repeat_gradient.h"
  57 #include "valuenode_stripes.h"
  58 #include "valuenode_range.h"
  59 #include "valuenode_add.h"
  60 #include "valuenode_subtract.h"
  61 #include "valuenode_timedswap.h"
  62 #include "valuenode_twotone.h"
  63 #include "valuenode_bline.h"
  64 #include "valuenode_dynamiclist.h"
  65 #include "valuenode_radialcomposite.h"
  66 #include "valuenode_gradientrotate.h"
  67 #include "valuenode_sine.h"
  68 #include "valuenode_cos.h"
  69 #include "valuenode_atan2.h"
  70 #include "valuenode_exp.h"
  71 #include "valuenode_switch.h"
  72 #include "valuenode_timeloop.h"
  73 #include "valuenode_reciprocal.h"
  74 #include "valuenode_duplicate.h"
  75 #include "valuenode_integer.h"
  76 #include "valuenode_step.h"
  77 #include "valuenode_vectorangle.h"
  78 #include "valuenode_vectorlength.h"
  79 #include "valuenode_vectorx.h"
  80 #include "valuenode_vectory.h"
  81 #include "valuenode_gradientcolor.h"
  82 #include "valuenode_dotproduct.h"
  83 #include "valuenode_timestring.h"
  84 #include "valuenode_realstring.h"
  85 #include "valuenode_join.h"
  86 #include "valuenode_anglestring.h"
  87 #include "valuenode_intstring.h"
  88 #include "valuenode_log.h"
  89 #include "valuenode_pow.h"
  90 #include "valuenode_compare.h"
  91 #include "valuenode_not.h"
  92 #include "valuenode_and.h"
  93 #include "valuenode_or.h"
  94
  95 #include "layer.h"
  96
  97 #endif
  98
  99 /* === U S I N G =========================================================== */
 100
 101 using namespace std;
 102 using namespace etl;
 103 using namespace synfig;
 104
 105 /* === M A C R O S ========================================================= */
 106
 107 /* === G L O B A L S ======================================================= */
 108
 109 static int value_node_count(0);
 110
 111 static LinkableValueNode::Book *book_;
 112
 113
 114 ValueNode::LooseHandle
 115 synfig::find_value_node(const GUID& guid)
 116 {
 117         return guid_cast<ValueNode>(guid);
 118 }
 119
 120 /* === P R O C E D U R E S ================================================= */
 121
 122 /* === M E T H O D S ======================================================= */
 123
 124 bool
 125 ValueNode::subsys_init()
 126 {
 127         book_=new LinkableValueNode::Book();
 128
 129 #define ADD_VALUENODE(class,name,local,version)                                                                                                 \
 130         (*book_)[name].factory=reinterpret_cast<LinkableValueNode::Factory>(&class::create);            \
 131         (*book_)[name].check_type=&class::check_type;                                                                                           \
 132         (*book_)[name].local_name=local;                                                                                                                        \
 133         (*book_)[name].release_version=version
 134
 135 #define ADD_VALUENODE2(class,name,local,version)                                                                                                \
 136         (*book_)[name].factory=reinterpret_cast<LinkableValueNode::Factory>(&class::create_from);       \
 137         (*book_)[name].check_type=&class::check_type;                                                                                           \
 138         (*book_)[name].local_name=local;                                                                                                                        \
 139         (*book_)[name].release_version=version
 140
 141         ADD_VALUENODE(ValueNode_Linear,                   "linear",                       _("Linear"),                   RELEASE_VERSION_0_61_06);
 142         ADD_VALUENODE(ValueNode_Composite,                "composite",            _("Composite"),                RELEASE_VERSION_0_61_06);
 143         ADD_VALUENODE(ValueNode_RadialComposite,  "radial_composite", _("Radial Composite"), RELEASE_VERSION_0_61_06);
 144         ADD_VALUENODE(ValueNode_Reference,                "reference",            _("Reference"),                RELEASE_VERSION_0_61_06);
 145         ADD_VALUENODE(ValueNode_Scale,                    "scale",                        _("Scale"),                    RELEASE_VERSION_0_61_06);
 146         ADD_VALUENODE(ValueNode_SegCalcTangent,   "segcalctangent",       _("Segment Tangent"),  RELEASE_VERSION_0_61_06);
 147         ADD_VALUENODE(ValueNode_SegCalcVertex,    "segcalcvertex",        _("Segment Vertex"),   RELEASE_VERSION_0_61_06);
 148         ADD_VALUENODE(ValueNode_Stripes,                  "stripes",              _("Stripes"),                  RELEASE_VERSION_0_61_06);
 149         ADD_VALUENODE(ValueNode_Subtract,                 "subtract",             _("Subtract"),                 RELEASE_VERSION_0_61_06);
 150         ADD_VALUENODE(ValueNode_TwoTone,                  "twotone",              _("Two-Tone"),                 RELEASE_VERSION_0_61_06);
 151         ADD_VALUENODE(ValueNode_BLine,                    "bline",                        _("BLine"),                    RELEASE_VERSION_0_61_06);
 152         ADD_VALUENODE2(ValueNode_DynamicList,     "dynamic_list",         _("Dynamic List"),     RELEASE_VERSION_0_61_06);
 153         ADD_VALUENODE(ValueNode_GradientRotate,   "gradient_rotate",  _("Gradient Rotate"),      RELEASE_VERSION_0_61_06);
 154         ADD_VALUENODE(ValueNode_Sine,                     "sine",                         _("Sine"),                     RELEASE_VERSION_0_61_06);
 155
 156         ADD_VALUENODE(ValueNode_TimedSwap,                "timed_swap",           _("Timed Swap"),               RELEASE_VERSION_0_61_07); // SVN r610
 157         ADD_VALUENODE(ValueNode_Repeat_Gradient,  "repeat_gradient",  _("Repeat Gradient"),      RELEASE_VERSION_0_61_07); // SVN r666
 158         ADD_VALUENODE(ValueNode_Exp,                      "exp",                          _("Exponential"),              RELEASE_VERSION_0_61_07); // SVN r739
 159         ADD_VALUENODE(ValueNode_Add,                      "add",                          _("Add"),                              RELEASE_VERSION_0_61_07); // SVN r742
 160         ADD_VALUENODE(ValueNode_BLineCalcTangent, "blinecalctangent", _("BLine Tangent"),        RELEASE_VERSION_0_61_07); // SVN r744
 161         ADD_VALUENODE(ValueNode_BLineCalcVertex,  "blinecalcvertex",  _("BLine Vertex"),         RELEASE_VERSION_0_61_07); // SVN r744
 162         ADD_VALUENODE(ValueNode_Range,                    "range",                        _("Range"),                    RELEASE_VERSION_0_61_07); // SVN r776
 163
 164         ADD_VALUENODE(ValueNode_Switch,                   "switch",                       _("Switch"),                   RELEASE_VERSION_0_61_08); // SVN r923
 165         ADD_VALUENODE(ValueNode_Cos,                      "cos",                          _("Cos"),                              RELEASE_VERSION_0_61_08); // SVN r1111
 166         ADD_VALUENODE(ValueNode_Atan2,                    "atan2",                        _("aTan2"),                    RELEASE_VERSION_0_61_08); // SVN r1132
 167         ADD_VALUENODE(ValueNode_BLineRevTangent,  "blinerevtangent",  _("Reverse Tangent"),      RELEASE_VERSION_0_61_08); // SVN r1162
 168         ADD_VALUENODE(ValueNode_TimeLoop,                 "timeloop",             _("Time Loop"),                RELEASE_VERSION_0_61_08); // SVN r1226
 169         ADD_VALUENODE(ValueNode_Reciprocal,               "reciprocal",           _("Reciprocal"),               RELEASE_VERSION_0_61_08); // SVN r1238
 170         ADD_VALUENODE(ValueNode_Duplicate,                "duplicate",            _("Duplicate"),                RELEASE_VERSION_0_61_08); // SVN r1267
 171         ADD_VALUENODE(ValueNode_Integer,                  "fromint",              _("From Integer"),     RELEASE_VERSION_0_61_08); // SVN r1267
 172         ADD_VALUENODE(ValueNode_Step,                     "step",                         _("Step"),                     RELEASE_VERSION_0_61_08); // SVN r1691
 173         ADD_VALUENODE(ValueNode_BLineCalcWidth,   "blinecalcwidth",       _("BLine Width"),              RELEASE_VERSION_0_61_08); // SVN r1694
 174
 175         ADD_VALUENODE(ValueNode_VectorAngle,      "vectorangle",          _("Vector Angle"),     RELEASE_VERSION_0_61_09); // SVN r1880
 176         ADD_VALUENODE(ValueNode_VectorLength,     "vectorlength",         _("Vector Length"),    RELEASE_VERSION_0_61_09); // SVN r1881
 177         ADD_VALUENODE(ValueNode_VectorX,                  "vectorx",              _("Vector X"),                 RELEASE_VERSION_0_61_09); // SVN r1882
 178         ADD_VALUENODE(ValueNode_VectorY,                  "vectory",              _("Vector Y"),                 RELEASE_VERSION_0_61_09); // SVN r1882
 179         ADD_VALUENODE(ValueNode_GradientColor,    "gradientcolor",        _("Gradient Color"),   RELEASE_VERSION_0_61_09); // SVN r1885
 180         ADD_VALUENODE(ValueNode_DotProduct,               "dotproduct",           _("Dot Product"),              RELEASE_VERSION_0_61_09); // SVN r1891
 181         ADD_VALUENODE(ValueNode_TimeString,               "timestring",           _("Time String"),              RELEASE_VERSION_0_61_09); // SVN r2000
 182         ADD_VALUENODE(ValueNode_RealString,               "realstring",           _("Real String"),              RELEASE_VERSION_0_61_09); // SVN r2003
 183         ADD_VALUENODE(ValueNode_Join,                     "join",                         _("Joined List"),              RELEASE_VERSION_0_61_09); // SVN r2007
 184         ADD_VALUENODE(ValueNode_AngleString,      "anglestring",          _("Angle String"),     RELEASE_VERSION_0_61_09); // SVN r2010
 185         ADD_VALUENODE(ValueNode_IntString,                "intstring",            _("Int String"),               RELEASE_VERSION_0_61_09); // SVN r2010
 186         ADD_VALUENODE(ValueNode_Logarithm,                "logarithm",            _("Logarithm"),                RELEASE_VERSION_0_61_09); // SVN r2034
 187
 188         ADD_VALUENODE(ValueNode_Greyed,                   "greyed",                       _("Greyed"),                   RELEASE_VERSION_0_62_00); // SVN r2305
 189         ADD_VALUENODE(ValueNode_Pow,                  "power",                _("Power"),                    RELEASE_VERSION_0_62_00); // SVN r2362
 190         ADD_VALUENODE(ValueNode_Compare,                  "compare",              _("Compare"),                  RELEASE_VERSION_0_62_00); // SVN r2364
 191         ADD_VALUENODE(ValueNode_Not,                  "not",                      _("Not"),                              RELEASE_VERSION_0_62_00); // SVN r2364
 192         ADD_VALUENODE(ValueNode_And,                  "and",                      _("And"),                              RELEASE_VERSION_0_62_00); // SVN r2364
 193         ADD_VALUENODE(ValueNode_Or,                       "or",                   _("Or"),                                       RELEASE_VERSION_0_62_00); // SVN r2364
 194
 195 #undef ADD_VALUENODE
 196 #undef ADD_VALUENODE2
 197
 198         return true;
 199 }
 200
 201 bool
 202 ValueNode::subsys_stop()
 203 {
 204         delete book_;
 205 /*      if(global_value_node_map.size() || value_node_count)
 206         {
 207                 if(value_node_count)
 208                         synfig::error("%d ValueNodes haven't been destroyed yet!",value_node_count);
 209
 210                 if(global_value_node_map.size()!=value_node_count)
 211                         synfig::error("value node count mismatch! map.size()!=value_node_count (%d!=%d)",global_value_node_map.size(),value_node_count);
 212
 213                 GlobalValueNodeMap::iterator iter;
 214                 for(iter=global_value_node_map.begin();iter!=global_value_node_map.end();++iter)
 215                 {
 216                         if(!iter->second->is_exported())
 217                                 synfig::info(_("%s: count:%d name:%s type:%s"),
 218                                         iter->first.get_string().c_str(),
 219                                         iter->second->count(),
 220                                         iter->second->get_name().c_str(),
 221                                         ValueBase::type_local_name(iter->second->get_type()).c_str()
 222                                 );
 223                         else
 224                                 synfig::info(_("%s: id:%s count:%d name:%s type:%s"),
 225                                         iter->first.get_string().c_str(),
 226                                         iter->second->get_id().c_str(),
 227                                         iter->second->count(),
 228                                         iter->second->get_name().c_str(),
 229                                         ValueBase::type_local_name(iter->second->get_type()).c_str()
 230                                 );
 231                 }
 232         }
 233 */
 234         return true;
 235 }
 236
 237 ValueNode::ValueNode(ValueBase::Type type):type(type)
 238 {
 239         value_node_count++;
 240 }
 241
 242 LinkableValueNode::Book&
 243 LinkableValueNode::book()
 244 {
 245         return *book_;
 246 }
 247
 248 LinkableValueNode::Handle
 249 LinkableValueNode::create(const String &name, const ValueBase& x)
 250 {
 251         if(!book().count(name))
 252                 return 0;
 253
 254         if (!check_type(name, x.get_type()) &&
 255                 // the Duplicate ValueNode is an exception - we don't want the
 256                 // user creating it for themselves, so check_type() fails for
 257                 // it even when it is valid
 258                 !(name == "duplicate" && x.get_type() == ValueBase::TYPE_REAL))
 259         {
 260                 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());
 261                 return 0;
 262         }
 263
 264         return book()[name].factory(x);
 265 }
 266
 267 bool
 268 LinkableValueNode::check_type(const String &name, ValueBase::Type x)
 269 {
 270         if(!book().count(name) || !book()[name].check_type)
 271                 return false;
 272         return book()[name].check_type(x);
 273 }
 274
 275 bool
 276 LinkableValueNode::set_link(int i,ValueNode::Handle x)
 277 {
 278         ValueNode::Handle previous(get_link(i));
 279
 280         if(set_link_vfunc(i,x))
 281         {
 282                 // Fix 2412072: remove the previous link from the parent_set unless one of the other links is also
 283                 // using it when we convert a value to 'switch', both 'on' and 'off' are linked to the same valuenode
 284                 // if we then disconnect one of the two, the one we disconnect is set to be a new valuenode_const
 285                 // and the previously shared value is removed from the parent set even though the other is still
 286                 // using it
 287                 if(previous)
 288                 {
 289                         int size = link_count(), index;
 290                         for (index=0; index < size; ++index)
 291                         {
 292                                 if (i == index) continue;
 293                                 if (get_link(index) == previous)
 294                                         break;
 295                         }
 296                         if (index == size)
 297                                 remove_child(previous.get());
 298                 }
 299                 add_child(x.get());
 300
 301                 if(!x->is_exported() && get_parent_canvas())
 302                 {
 303                         x->set_parent_canvas(get_parent_canvas());
 304                 }
 305                 changed();
 306                 return true;
 307         }
 308         return false;
 309 }
 310
 311 ValueNode::LooseHandle
 312 LinkableValueNode::get_link(int i)const
 313 {
 314         return get_link_vfunc(i);
 315 }
 316
 317 void
 318 LinkableValueNode::unlink_all()
 319 {
 320         for(int i=0;i<link_count();i++)
 321         {
 322                 ValueNode::LooseHandle value_node(get_link(i));
 323                 if(value_node)
 324                         value_node->parent_set.erase(this);
 325         }
 326 }
 327
 328 ValueNode::~ValueNode()
 329 {
 330         value_node_count--;
 331
 332         begin_delete();
 333 }
 334
 335 void
 336 ValueNode::on_changed()
 337 {
 338         etl::loose_handle<Canvas> parent_canvas = get_parent_canvas();
 339         if(parent_canvas)
 340                 do                                              // signal to all the ancestor canvases
 341                         parent_canvas->signal_value_node_changed()(this);
 342                 while (parent_canvas = parent_canvas->parent());
 343         else if(get_root_canvas())
 344                 get_root_canvas()->signal_value_node_changed()(this);
 345
 346         Node::on_changed();
 347 }
 348
 349 int
 350 ValueNode::replace(etl::handle<ValueNode> x)
 351 {
 352         if(x.get()==this)
 353                 return 0;
 354
 355         while(parent_set.size())
 356         {
 357                 (*parent_set.begin())->add_child(x.get());
 358                 (*parent_set.begin())->remove_child(this);
 359                 //x->parent_set.insert(*parent_set.begin());
 360                 //parent_set.erase(parent_set.begin());
 361         }
 362         int r(RHandle(this).replace(x));
 363         x->changed();
 364         return r;
 365 }
 366
 367 void
 368 ValueNode::set_id(const String &x)
 369 {
 370         if(name!=x)
 371         {
 372                 name=x;
 373                 signal_id_changed_();
 374         }
 375 }
 376
 377 String
 378 ValueNode::get_description(bool show_exported_name)const
 379 {
 380         String ret(_("ValueNode"));
 381
 382         if (dynamic_cast<const LinkableValueNode*>(this))
 383                 return (dynamic_cast<const LinkableValueNode*>(this))->get_description(-1, show_exported_name);
 384
 385         if (show_exported_name && !is_exported())
 386                 show_exported_name = false;
 387
 388         if (show_exported_name)
 389                 ret += strprintf(" (%s)", get_id().c_str());
 390
 391         return ret;
 392 }
 393
 394 ValueNodeList::ValueNodeList():
 395         placeholder_count_(0)
 396 {
 397 }
 398
 399 bool
 400 ValueNodeList::count(const String &id)const
 401 {
 402         const_iterator iter;
 403
 404         if(id.empty())
 405                 return false;
 406
 407         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 408                 ;
 409
 410         if(iter==end())
 411                 return false;
 412
 413         return true;
 414 }
 415
 416 ValueNode::Handle
 417 ValueNodeList::find(const String &id)
 418 {
 419         iterator iter;
 420
 421         if(id.empty())
 422                 throw Exception::IDNotFound("Empty ID");
 423
 424         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 425                 ;
 426
 427         if(iter==end())
 428                 throw Exception::IDNotFound("ValueNode in ValueNodeList: "+id);
 429
 430         return *iter;
 431 }
 432
 433 ValueNode::ConstHandle
 434 ValueNodeList::find(const String &id)const
 435 {
 436         const_iterator iter;
 437
 438         if(id.empty())
 439                 throw Exception::IDNotFound("Empty ID");
 440
 441         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 442                 ;
 443
 444         if(iter==end())
 445                 throw Exception::IDNotFound("ValueNode in ValueNodeList: "+id);
 446
 447         return *iter;
 448 }
 449
 450 ValueNode::Handle
 451 ValueNodeList::surefind(const String &id)
 452 {
 453         if(id.empty())
 454                 throw Exception::IDNotFound("Empty ID");
 455
 456         ValueNode::Handle value_node;
 457
 458         try
 459         {
 460                 value_node=find(id);
 461         }
 462         catch(Exception::IDNotFound)
 463         {
 464                 value_node=PlaceholderValueNode::create();
 465                 value_node->set_id(id);
 466                 push_back(value_node);
 467                 placeholder_count_++;
 468         }
 469
 470         return value_node;
 471 }
 472
 473 bool
 474 ValueNodeList::erase(ValueNode::Handle value_node)
 475 {
 476         assert(value_node);
 477
 478         iterator iter;
 479
 480         for(iter=begin();iter!=end();++iter)
 481                 if(value_node.get()==iter->get())
 482                 {
 483                         std::list<ValueNode::RHandle>::erase(iter);
 484                         if(PlaceholderValueNode::Handle::cast_dynamic(value_node))
 485                                 placeholder_count_--;
 486                         return true;
 487                 }
 488         return false;
 489 }
 490
 491 bool
 492 ValueNodeList::add(ValueNode::Handle value_node)
 493 {
 494         if(!value_node)
 495                 return false;
 496         if(value_node->get_id().empty())
 497                 return false;
 498
 499         try
 500         {
 501                 ValueNode::RHandle other_value_node=find(value_node->get_id());
 502                 if(PlaceholderValueNode::Handle::cast_dynamic(other_value_node))
 503                 {
 504                         other_value_node->replace(value_node);
 505                         placeholder_count_--;
 506                         return true;
 507                 }
 508
 509                 return false;
 510         }
 511         catch(Exception::IDNotFound)
 512         {
 513                 push_back(value_node);
 514                 return true;
 515         }
 516
 517         return false;
 518 }
 519
 520 void
 521 ValueNodeList::audit()
 522 {
 523         iterator iter,next;
 524
 525         for(next=begin(),iter=next++;iter!=end();iter=next++)
 526                 if(iter->count()==1)
 527                         std::list<ValueNode::RHandle>::erase(iter);
 528 }
 529
 530
 531 String
 532 PlaceholderValueNode::get_name()const
 533 {
 534         return "placeholder";
 535 }
 536
 537 String
 538 PlaceholderValueNode::get_local_name()const
 539 {
 540         return _("Placeholder");
 541 }
 542
 543 ValueNode*
 544 PlaceholderValueNode::clone(const GUID& deriv_guid)const
 545 {
 546         ValueNode* ret(new PlaceholderValueNode());
 547         ret->set_guid(get_guid()^deriv_guid);
 548         return ret;
 549 }
 550
 551 PlaceholderValueNode::Handle
 552 PlaceholderValueNode::create(ValueBase::Type type)
 553 {
 554         return new PlaceholderValueNode(type);
 555 }
 556
 557 ValueBase
 558 PlaceholderValueNode::operator()(Time /*t*/)const
 559 {
 560         assert(0);
 561         return ValueBase();
 562 }
 563
 564 PlaceholderValueNode::PlaceholderValueNode(ValueBase::Type type):
 565         ValueNode(type)
 566 {
 567 }
 568
 569 ValueNode*
 570 LinkableValueNode::clone(const GUID& deriv_guid)const
 571 {
 572         {
 573                 ValueNode* x(find_value_node(get_guid()^deriv_guid).get());
 574                 if(x)
 575                         return x;
 576         }
 577
 578         int i;
 579         LinkableValueNode *ret=create_new();
 580         ret->set_guid(get_guid()^deriv_guid);
 581
 582         for(i=0;i<link_count();i++)
 583         {
 584                 ValueNode::Handle link=get_link_vfunc(i);
 585                 if(!link->is_exported())
 586                 {
 587                         ValueNode::LooseHandle value_node(find_value_node(link->get_guid()^deriv_guid));
 588                         if(!value_node)
 589                                 value_node=link->clone(deriv_guid);
 590                         ret->set_link(i,value_node);
 591                 }
 592                 else
 593                         ret->set_link(i,link);
 594         }
 595
 596         return ret;
 597 }
 598
 599 String
 600 ValueNode::get_relative_id(etl::loose_handle<const Canvas> x)const
 601 {
 602         assert(is_exported());
 603         assert(canvas_);
 604
 605         if(x.get()==canvas_.get())
 606                 return get_id();
 607
 608         return canvas_->_get_relative_id(x)+':'+get_id();
 609 }
 610
 611 void
 612 ValueNode::set_parent_canvas(etl::loose_handle<Canvas> x)
 613 {
 614         canvas_=x; if(x) root_canvas_=x->get_root();
 615 }
 616
 617 void
 618 ValueNode::set_root_canvas(etl::loose_handle<Canvas> x)
 619 {
 620         root_canvas_=x->get_root();
 621 }
 622
 623 void LinkableValueNode::get_times_vfunc(Node::time_set &set) const
 624 {
 625         ValueNode::LooseHandle  h;
 626
 627         int size = link_count();
 628
 629         //just add it to the set...
 630         for(int i=0; i < size; ++i)
 631         {
 632                 h = get_link(i);
 633
 634                 if(h)
 635                 {
 636                         const Node::time_set &tset = h->get_times();
 637                         set.insert(tset.begin(),tset.end());
 638                 }
 639         }
 640 }
 641
 642 String
 643 LinkableValueNode::get_description(int index, bool show_exported_name)const
 644 {
 645         String description;
 646
 647         if (index == -1)
 648         {
 649                 if (show_exported_name && is_exported())
 650                         description += strprintf(" (%s)", get_id().c_str());
 651         }
 652         else
 653         {
 654                 description = String(":") + link_local_name(index);
 655
 656                 if (show_exported_name)
 657                 {
 658                         ValueNode::LooseHandle link(get_link(index));
 659                         if (link->is_exported())
 660                                 description += strprintf(" (%s)", link->get_id().c_str());
 661                 }
 662         }
 663
 664         const synfig::Node* node = this;
 665         LinkableValueNode::ConstHandle parent_linkable_vn = 0;
 666
 667         // walk up through the valuenodes trying to find the layer at the top
 668         while (!node->parent_set.empty() && !dynamic_cast<const Layer*>(node))
 669         {
 670                 LinkableValueNode::ConstHandle linkable_value_node(dynamic_cast<const LinkableValueNode*>(node));
 671                 if (linkable_value_node)
 672                 {
 673                         String link;
 674                         int cnt = linkable_value_node->link_count();
 675                         for (int i = 0; i < cnt; i++)
 676                                 if (linkable_value_node->get_link(i) == parent_linkable_vn)
 677                                 {
 678                                         link = String(":") + linkable_value_node->link_local_name(i);
 679                                         break;
 680                                 }
 681
 682                         description = linkable_value_node->get_local_name() + link + (parent_linkable_vn?">":"") + description;
 683                 }
 684                 node = *node->parent_set.begin();
 685                 parent_linkable_vn = linkable_value_node;
 686         }
 687
 688         Layer::ConstHandle parent_layer(dynamic_cast<const Layer*>(node));
 689         if(parent_layer)
 690         {
 691                 String param;
 692                 const Layer::DynamicParamList &dynamic_param_list(parent_layer->dynamic_param_list());
 693                 // loop to find the parameter in the dynamic parameter list - this gives us its name
 694                 for (Layer::DynamicParamList::const_iterator iter = dynamic_param_list.begin(); iter != dynamic_param_list.end(); iter++)
 695                         if (iter->second == parent_linkable_vn)
 696                                 param = String(":") + parent_layer->get_param_local_name(iter->first);
 697                 description = strprintf("(%s)%s>%s",
 698                                                                 parent_layer->get_non_empty_description().c_str(),
 699                                                                 param.c_str(),
 700                                                                 description.c_str());
 701         }
 702
 703         return description;
 704 }