bundles/org.simantics.modeling/src/org/simantics/modeling/SCLScenegraph.java

   1 package org.simantics.modeling;
   2
   3 import java.awt.BasicStroke;
   4 import java.awt.Color;
   5 import java.awt.Dimension;
   6 import java.awt.RenderingHints;
   7 import java.awt.RenderingHints.Key;
   8 import java.awt.geom.AffineTransform;
   9 import java.awt.geom.Rectangle2D;
  10 import java.io.ByteArrayOutputStream;
  11 import java.io.OutputStreamWriter;
  12 import java.util.ArrayList;
  13 import java.util.Arrays;
  14 import java.util.Collection;
  15 import java.util.HashMap;
  16 import java.util.HashSet;
  17 import java.util.List;
  18 import java.util.Map;
  19 import java.util.Random;
  20 import java.util.Set;
  21 import java.util.UUID;
  22 import java.util.function.Function;
  23 import java.util.stream.Collectors;
  24
  25 import javax.xml.transform.OutputKeys;
  26 import javax.xml.transform.Transformer;
  27 import javax.xml.transform.TransformerFactory;
  28 import javax.xml.transform.dom.DOMSource;
  29 import javax.xml.transform.stream.StreamResult;
  30
  31 import org.apache.batik.dom.GenericDOMImplementation;
  32 import org.apache.batik.svggen.SVGGeneratorContext;
  33 import org.apache.batik.svggen.SVGGraphics2D;
  34 import org.apache.batik.svggen.SVGIDGenerator;
  35 import org.simantics.Simantics;
  36 import org.simantics.datatypes.literal.GUID;
  37 import org.simantics.db.ReadGraph;
  38 import org.simantics.db.Resource;
  39 import org.simantics.db.common.request.IndexRoot;
  40 import org.simantics.db.common.request.ResourceRead;
  41 import org.simantics.db.common.request.UnaryRead;
  42 import org.simantics.db.exception.DatabaseException;
  43 import org.simantics.db.exception.RuntimeDatabaseException;
  44 import org.simantics.db.layer0.variable.Variables;
  45 import org.simantics.diagram.elements.DecorationSVGNode;
  46 import org.simantics.diagram.elements.DiagramNodeUtil;
  47 import org.simantics.diagram.elements.TextGridNode;
  48 import org.simantics.diagram.elements.TextNode;
  49 import org.simantics.diagram.stubs.DiagramResource;
  50 import org.simantics.diagram.ui.DiagramModelHints;
  51 import org.simantics.g2d.canvas.Hints;
  52 import org.simantics.g2d.canvas.ICanvasContext;
  53 import org.simantics.g2d.diagram.DiagramHints;
  54 import org.simantics.g2d.diagram.IDiagram;
  55 import org.simantics.g2d.diagram.handler.DataElementMap;
  56 import org.simantics.g2d.diagram.participant.ElementPainter.SelectionShapeNode;
  57 import org.simantics.g2d.diagram.participant.Selection;
  58 import org.simantics.g2d.element.IElement;
  59 import org.simantics.g2d.scenegraph.ICanvasSceneGraphProvider;
  60 import org.simantics.g2d.utils.CanvasUtils;
  61 import org.simantics.layer0.Layer0;
  62 import org.simantics.scenegraph.INode;
  63 import org.simantics.scenegraph.ParentNode;
  64 import org.simantics.scenegraph.g2d.G2DParentNode;
  65 import org.simantics.scenegraph.g2d.G2DRenderingHints;
  66 import org.simantics.scenegraph.g2d.G2DSceneGraph;
  67 import org.simantics.scenegraph.g2d.IG2DNode;
  68 import org.simantics.scenegraph.g2d.IG2DNodeVisitor;
  69 import org.simantics.scenegraph.g2d.events.command.Commands;
  70 import org.simantics.scenegraph.g2d.nodes.BackgroundNode;
  71 import org.simantics.scenegraph.g2d.nodes.BoundsNode;
  72 import org.simantics.scenegraph.g2d.nodes.ConnectionNode;
  73 import org.simantics.scenegraph.g2d.nodes.DataNode;
  74 import org.simantics.scenegraph.g2d.nodes.LinkNode;
  75 import org.simantics.scenegraph.g2d.nodes.NavigationNode;
  76 import org.simantics.scenegraph.g2d.nodes.SVGNode;
  77 import org.simantics.scenegraph.g2d.nodes.SelectionNode;
  78 import org.simantics.scenegraph.g2d.nodes.SingleElementNode;
  79 import org.simantics.scenegraph.g2d.nodes.connection.RouteGraphNode;
  80 import org.simantics.scenegraph.g2d.nodes.spatial.RTreeNode;
  81 import org.simantics.scenegraph.utils.NodeUtil;
  82 import org.simantics.scl.runtime.function.Function1;
  83 import org.simantics.scl.runtime.tuple.Tuple2;
  84 import org.simantics.trend.impl.ItemNode;
  85 import org.simantics.utils.threads.ThreadUtils;
  86 import org.slf4j.Logger;
  87 import org.slf4j.LoggerFactory;
  88 import org.w3c.dom.DOMImplementation;
  89 import org.w3c.dom.Document;
  90 import org.w3c.dom.Element;
  91 import org.w3c.dom.Node;
  92 import org.w3c.dom.NodeList;
  93
  94 public class SCLScenegraph {
  95
  96         private static final Logger LOGGER = LoggerFactory.getLogger(SCLScenegraph.class);
  97
  98         private static final String MAIN_SECTION = "main";
  99         private static final String SELECTION_SECTION = "selection";
 100         private static final String SELECTION_MASK_SECTION = "selectionMask";
 101
 102         private static final String[] ALL_SECTIONS = { MAIN_SECTION, SELECTION_SECTION, SELECTION_MASK_SECTION };
 103
 104         // Changed from 0.001 to 0.0001 to prevent creation of huge BufferedImage's when
 105         // generating PDF from SVG. If SVG contains any transparency then Batik uses
 106         // bitmap-rendering which remarkably slows things down
 107         // See org.apache.batik.gvt.AbstractGraphicsNode.paint(Graphics2D) where decisions are made
 108         // if AlphaComposite should be painted
 109         private static final String OPACITY = "0.0001";
 110
 111         @Deprecated
 112         public static ICanvasSceneGraphProvider getICanvasSceneGraphProvider(Resource model, Resource diagram, String diagramRVI) throws DatabaseException, InterruptedException {
 113                 ICanvasSceneGraphProvider provider = DiagramNodeUtil.loadSceneGraphProvider(model, diagram, diagramRVI);
 114                 return provider;
 115         }
 116
 117         @Deprecated
 118         public static void disposeSceneGraphProvider(ICanvasSceneGraphProvider provider) {
 119                 provider.dispose();
 120         }
 121
 122     public static <T> T doWithICanvasSceneGraphProvider(Resource diagram, Function1<ICanvasSceneGraphProvider, T> func) throws DatabaseException {
 123         return doWithICanvasSceneGraphProvider(diagram, (Function<ICanvasSceneGraphProvider, T>) provider -> func.apply(provider));
 124     }
 125
 126     public static <T> T doWithICanvasSceneGraphProvider(Resource diagram, Function<ICanvasSceneGraphProvider, T> func) throws DatabaseException {
 127         Tuple2 result = Simantics.getSession().syncRequest(new ResourceRead<Tuple2>(diagram) {
 128
 129             @Override
 130             public Tuple2 perform(ReadGraph graph) throws DatabaseException {
 131                 Resource indexRoot = graph.syncRequest(new IndexRoot(resource));
 132                 String diagramRVI = Variables.getRVI(graph, resource);
 133                 return new Tuple2(indexRoot, diagramRVI);
 134             }
 135         });
 136         ICanvasSceneGraphProvider provider = DiagramNodeUtil.loadSceneGraphProvider((Resource) result.c0, diagram, (String) result.c1);
 137         try {
 138             return func.apply(provider);
 139         } finally {
 140             provider.dispose();
 141         }
 142     }
 143
 144     public static <T> T doWithCanvasContext(Resource diagram, Function1<ICanvasContext, T> func) throws DatabaseException {
 145         return doWithCanvasContext(diagram, (Function<ICanvasContext, T>) canvasContext -> func.apply(canvasContext));
 146     }
 147
 148     public static <T> T doWithCanvasContext(Resource diagram, Function<ICanvasContext, T> func) throws DatabaseException {
 149         return doWithICanvasSceneGraphProvider(diagram, (Function<ICanvasSceneGraphProvider, T>) provider -> func.apply(provider.getCanvasContext()));
 150     }
 151
 152         public static String getNodeTransform(ICanvasContext ctx, String name) {
 153
 154                 Set<TextNode> texts = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 155                 for (TextNode text : texts) {
 156                         String nodeName = NodeUtil.getNodeName(text);
 157                         if (nodeName.equals(name)) {
 158                                 String transform = text.getTransform().toString();
 159                                 return transform;
 160                         }
 161                 }
 162                 return "No node found";
 163         }
 164
 165         public static String getNodeText(ICanvasContext ctx, String name) {
 166
 167                 Set<TextNode> texts = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 168                 for (TextNode text : texts) {
 169                         String nodeName = NodeUtil.getNodeName(text);
 170                         if (nodeName.equals(name)) {
 171                                 String texti = text.getText();
 172                                 return texti;
 173                         }
 174                 }
 175                 return "No node found";
 176         }
 177
 178         public static String getNodeCount(ICanvasContext ctx) {
 179                 G2DSceneGraph g2 = ctx.getSceneGraph();
 180                 int amount = NodeUtil.countTreeNodes(g2);
 181                 return "Node count: " + amount;
 182         }
 183
 184     public static String getAllNodes (ICanvasContext ctx) {
 185
 186         Set<G2DSceneGraph> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), G2DSceneGraph.class);
 187         int amount = g2.size() +1;
 188         return "All nodes: " + amount;
 189     }
 190
 191     public static String getBoundsNodes (ICanvasContext ctx) {
 192
 193         Set<BoundsNode> bn = NodeUtil.collectNodes(ctx.getSceneGraph(), BoundsNode.class);
 194         int amount = bn.size();
 195         return "BoundsNodes: " + amount;
 196     }
 197
 198     public static String getBackgroundNodes (ICanvasContext ctx) {
 199
 200         Set<BackgroundNode> bg = NodeUtil.collectNodes(ctx.getSceneGraph(), BackgroundNode.class);
 201         int amount = bg.size();
 202         return "BackgroundNodes: " + amount;
 203     }
 204
 205     public static String getDataNodes (ICanvasContext ctx) {
 206
 207         Set<DataNode> dn = NodeUtil.collectNodes(ctx.getSceneGraph(), DataNode.class);
 208         int amount = dn.size();
 209         return "DataNodes: " + amount;
 210     }
 211
 212     public static String getNavigationNodes (ICanvasContext ctx) {
 213
 214         Set<NavigationNode> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), NavigationNode.class);
 215         int amount = g2.size();
 216         return "NavigationNodes: " + amount;
 217     }
 218
 219     public static String getParentNodes (ICanvasContext ctx) {
 220
 221         Set<G2DParentNode> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), G2DParentNode.class);
 222         int amount = g2.size();
 223         return "ParentNodes: " + amount;
 224     }
 225
 226     public static String getDecorationNodes (ICanvasContext ctx) {
 227
 228         Set<DecorationSVGNode> deco = NodeUtil.collectNodes(ctx.getSceneGraph(), DecorationSVGNode.class);
 229         int amount = deco.size();
 230         return "DecorationNodes: " + amount;
 231     }
 232
 233     public static String getSingleElementNodes (ICanvasContext ctx) {
 234
 235         Set<SingleElementNode> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), SingleElementNode.class);
 236         int amount = g2.size();
 237         return "SingleElementNodes: " + amount;
 238     }
 239
 240     public static String getConnectionNodes (ICanvasContext ctx) {
 241
 242         Set<ConnectionNode> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), ConnectionNode.class);
 243         int amount = g2.size();
 244         return "ConnectionNodes: " + amount;
 245     }
 246
 247     public static String getTextNodes (ICanvasContext ctx) {
 248
 249         Set<TextNode> tn = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 250         Set<TextGridNode> tgn = NodeUtil.collectNodes(ctx.getSceneGraph(), TextGridNode.class);
 251         int amount = tn.size() + tgn.size();
 252         return "TextNodes: " + amount;
 253     }
 254
 255     public static String getItemNodes (ICanvasContext ctx) {
 256
 257         Set<ItemNode> item = NodeUtil.collectNodes(ctx.getSceneGraph(), ItemNode.class);
 258         int amount = item.size();
 259         return "ItemNodes: " + amount;
 260     }
 261
 262     public static String editNodeText (ICanvasContext ctx, String module, String previous_value, String new_value) {
 263
 264         Set<TextNode> textGridNodes = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 265         for (TextNode modulenode : textGridNodes) {
 266                 if (module.equals(modulenode.getText())) {
 267                         //System.out.println("Module what we were looking for: " + module);
 268                         //System.out.println("Modulenode: " + modulenode.getText());
 269
 270                         ParentNode<?> parentnode = modulenode.getParent();
 271                         //System.out.println("Parentnode: " + parentnode);
 272
 273                         Collection<TextNode> textnodes = (Collection<TextNode>) parentnode.getNodes();
 274                         for (TextNode valuenode : textnodes) {
 275                                 if (previous_value.equals(valuenode.getText())) {
 276                                         //System.out.println("Value what we were looking for: " + previous_value);
 277                                         //System.out.println("Valuenode: " + valuenode.getText());
 278
 279                                         //valuenode.setEditMode(true);
 280                                         valuenode.activateEdit(0, null, ctx);
 281                                         valuenode.setText(new_value);
 282                                         valuenode.fireTextEditingEnded();
 283
 284                                         //System.out.println("valuenode modified: " + valuenode);
 285                                         return "Modified module " + module + " with value " + new_value;
 286                                 }
 287                         }
 288                         return "Not found module : " + module;
 289                 }
 290         }
 291         return "No nodes in scenegraph!";
 292     }
 293
 294     /**
 295      * Returns background color of a canvasContext or null.
 296      * @param ctx
 297      * @return color in RGBA List<Integer> format, or null.
 298      */
 299     public static List<Integer> getBackgroundColor(ICanvasContext ctx) {
 300         Color color = ctx.getDefaultHintContext().getHint(Hints.KEY_BACKGROUND_COLOR);
 301         if (color == null)
 302                 return null;
 303         ArrayList<Integer> rgba = new ArrayList<>(4);
 304         rgba.add(color.getRed());
 305         rgba.add(color.getGreen());
 306         rgba.add(color.getBlue());
 307         rgba.add(color.getAlpha());
 308         return rgba;
 309     }
 310
 311     public static String sceneGraphTest (ICanvasContext ctx, String module, String value) {
 312
 313         boolean module_founded = false;
 314         boolean value_founded = false;
 315
 316         Set<G2DSceneGraph> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), G2DSceneGraph.class);
 317         System.out.println("Total amount of nodes: " + g2.size() + 1);
 318
 319         Set<TextGridNode> grid = NodeUtil.collectNodes(ctx.getSceneGraph(), TextGridNode.class);
 320         Integer textGridNodeAmount = grid.size();
 321         System.out.println("Amount of TextGridNodes " + textGridNodeAmount);
 322
 323         Set<TextNode> texts = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 324         Integer textNodeAmount = grid.size();
 325         System.out.println("Amount of TextNodes " + textNodeAmount);
 326
 327         for (TextNode node : texts) {
 328             if (module.equals(node.getText())) {
 329                 module_founded = true;
 330                 System.out.println("Correct module " + module + " founded.");
 331             }
 332             if (value.equals(node.getText())) {
 333                 value_founded = true;
 334                 System.out.println("Correct value " + value + " founded.");
 335             }
 336         }
 337
 338         if (value_founded == true && module_founded == true) {
 339                 return "Found both correct module " + module + " and value " + value;
 340         }
 341         if (value_founded == false && module_founded == true) {
 342                 return "Found only correct module " + module + " but not value " + value;
 343         }
 344         if (value_founded == true && module_founded == false) {
 345                 return "Found only correct value " + value + " but not module " + module;
 346         }
 347         else {
 348                 return "Didn't found either module " + module + " or value " + value;
 349         }
 350     }
 351
 352     public static boolean copyPaste (final ICanvasContext source_ctx, final ICanvasContext target_ctx, List<Resource> modules) throws DatabaseException {
 353
 354         IDiagram idiagram = source_ctx.getDefaultHintContext().getHint(DiagramHints.KEY_DIAGRAM);
 355
 356                 DataElementMap dem = idiagram.getDiagramClass().getAtMostOneItemOfClass(DataElementMap.class);
 357                 if (dem != null) {
 358                         final Collection<IElement> newSelection = new ArrayList<IElement>();
 359                         for (Resource module : modules) {
 360                                 IElement element = dem.getElement(idiagram, module);
 361                                 if (element != null) {
 362                                         newSelection.add(element);
 363                                 } else {
 364                                         throw new DatabaseException("Could not find IElement for " + element);
 365                                 }
 366                         }
 367
 368                         ThreadUtils.syncExec(source_ctx.getThreadAccess(), new Runnable() {
 369                     @Override
 370                     public void run() {
 371                         if (source_ctx.isDisposed())
 372                             return;
 373                         Selection selection = source_ctx.getAtMostOneItemOfClass(Selection.class);
 374                         if (selection != null) {
 375                             // This prevents workbench selection from being left over.
 376                             // Also prevents scene graph crap from being left on the screen.
 377                             selection.setSelection(0, newSelection);
 378                         }
 379                                 CanvasUtils.sendCommand(source_ctx, Commands.COPY);
 380                                 CanvasUtils.sendCommand(target_ctx, Commands.PASTE);
 381                     }
 382                 });
 383
 384                 //}
 385
 386                 while(source_ctx.getEventQueue().size() > 0) {
 387                         try {
 388                                 Thread.sleep(10);
 389                         } catch (InterruptedException e) {
 390                                 throw new DatabaseException(e);
 391                         }
 392                 }
 393
 394                 ThreadUtils.syncExec(source_ctx.getThreadAccess(), new Runnable() {
 395             @Override
 396             public void run() {
 397             }
 398         });
 399
 400                 }
 401                 return true;
 402     }
 403
 404
 405     static class UniqueIDGenerator extends SVGIDGenerator{
 406
 407         String overallId;
 408         public UniqueIDGenerator(String overallId) {
 409                 super();
 410                 this.overallId = overallId;
 411         }
 412
 413         @Override
 414         public String generateID(String prefix) {
 415                 return super.generateID(overallId+prefix);
 416         }
 417
 418     }
 419
 420         static class Generator extends SVGGraphics2D {
 421
 422                 int elemLevel = 0;
 423                 String newElementId = null;
 424                 ArrayList<Element> elements = new ArrayList<Element>();
 425
 426                 public static final String svgNS = "http://www.w3.org/2000/svg";
 427
 428                 public Generator(SVGGeneratorContext ctx, boolean textAsShapes) {
 429                         super(ctx, textAsShapes);
 430                 }
 431
 432                 public Generator(Document document) {
 433                         this(document,null);
 434                 }
 435                 public Generator(Document document, String id) {
 436                         super(document);
 437                         // prevent batik comment in each g-element
 438                         getGeneratorContext().setComment(null);
 439                         if (id != null)
 440                                 getGeneratorContext().setIDGenerator(new UniqueIDGenerator(id));
 441                 }
 442
 443                 @Override
 444                 public Element getRoot() {
 445                         Element root = super.getRoot();
 446                         for(Element e : elements) {
 447                                 root.appendChild(e);
 448                         }
 449                         return root;
 450                 }
 451
 452                 @Override
 453                 public void setRenderingHint(Key arg0, Object arg1) {
 454                         if(G2DRenderingHints.KEY_BEGIN_ELEMENT == arg0) {
 455                                 elemLevel++;
 456                         }
 457                         if(G2DRenderingHints.KEY_ELEMENT_ID == arg0) {
 458                                 if(arg1 != null)
 459                                         newElementId = arg1.toString();
 460                                 else
 461                                         newElementId = UUID.randomUUID().toString();
 462                         }
 463                         if(G2DRenderingHints.KEY_END_ELEMENT == arg0) {
 464                                 elemLevel--;
 465                                 if(elemLevel == 0) {
 466                                         Element group = getDOMFactory().createElement(SVG_G_TAG);
 467                                         //Element group = getDOMFactory().createElementNS(SVG_NAMESPACE_URI, SVG_G_TAG);
 468                                         group.setAttributeNS(null, "id", newElementId);
 469                                         group.setAttributeNS(null, "class", arg1.toString());
 470                                         getRoot(group);
 471                                         elements.add(group);
 472                                 }
 473                         }
 474                         super.setRenderingHint(arg0, arg1);
 475                 }
 476
 477         }
 478
 479         public static Element renderSVGNode(SVGGraphics2D svgGenerator, IG2DNode node) {
 480
 481                 try {
 482
 483                         svgGenerator.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
 484                         svgGenerator.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
 485                         svgGenerator.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
 486
 487                         node.render(svgGenerator);
 488
 489                 } catch (Throwable t) {
 490                         LOGGER.error("Problems rendering scene graph to SVG", t);
 491                 }
 492
 493                 return svgGenerator.getRoot();
 494         }
 495
 496         public static String printSVGDocument(Element doce) {
 497
 498                 StringBuilder result = new StringBuilder();
 499
 500                 NodeList nl =  doce.getChildNodes();
 501
 502                 for(int i=0;i<nl.getLength();i++) {
 503
 504                         ByteArrayOutputStream os = new ByteArrayOutputStream();
 505
 506                         try {
 507
 508                                 TransformerFactory tf = TransformerFactory.newInstance();
 509                                 Transformer transformer = tf.newTransformer();
 510                                 transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
 511                                 transformer.setOutputProperty(OutputKeys.STANDALONE, "no");
 512                                 transformer.setOutputProperty(OutputKeys.METHOD, "xml");
 513                                 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 514                                 transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
 515                                 transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
 516
 517                                 transformer.transform(new DOMSource(nl.item(i)),
 518                                                 new StreamResult(new OutputStreamWriter(os, "UTF-8")));
 519
 520                                 os.flush();
 521                                 os.close();
 522
 523                         } catch (Throwable t) {
 524                                 LOGGER.error("Problems formatting SVGDocument to text.", t);
 525                         }
 526
 527                         result.append(new String(os.toByteArray()));
 528
 529                 }
 530
 531                 return result.toString();
 532
 533         }
 534
 535         public static String renderSVG3(ICanvasContext ctx) {
 536                 return renderSVG3(ctx, -1, -1);
 537         }
 538
 539         public static String renderSVG3(ICanvasContext ctx, double width, double height) {
 540         return renderSVG0(width, height, ctx, p0 -> p0.stream().collect(Collectors.toMap(p1 -> p1, p2 -> p2)));
 541         }
 542
 543     /**
 544      * @param graph
 545      * @param component
 546      * @throws DatabaseException
 547      */
 548     private static Object[] createURIBasedL0Identifier(ReadGraph graph, Resource component) throws DatabaseException {
 549         String uri = graph.getPossibleURI(component);
 550         int hashCode = uri.hashCode();
 551         Random random = new Random(hashCode);
 552         long l1 = random.nextLong();
 553         long l2 = random.nextLong();
 554         return new Object[] { l1, l2 };
 555     }
 556
 557     /**
 558      * Default no-op mapper
 559      */
 560     private static final Function1<Set<?>, Map<?, ?>> mapper = p0 -> p0.stream().collect(Collectors.toMap(p1 -> p1, p2 -> p2));
 561
 562     public static String renderSVG(ICanvasContext ctx, double width, double height) {
 563         return renderSVG0(width, height, ctx, mapper);
 564     }
 565
 566     public static String renderSVG(ICanvasContext ctx) {
 567         return renderSVG(ctx, -1, -1);
 568     }
 569
 570     public static String renderSVGMapIdentifiers(ICanvasContext ctx) {
 571                 return renderSVGMapIdentifiers(ctx, -1, -1);
 572     }
 573
 574     /**
 575      * Renders ICanvasContext into SVG by mapping the SVG id's into URI based
 576      * GUID's
 577      *
 578      * @param ctx
 579      * @return
 580      */
 581     public static String renderSVGMapIdentifiers(ICanvasContext ctx, double width, double height) {
 582         return renderSVG0(width, height, ctx, new Function1<Set<?>, Map<?, ?>>() {
 583
 584             @Override
 585             public Map<?, ?> apply(Set<?> p0) {
 586                 try {
 587                     return Simantics.getSession().syncRequest(new UnaryRead<Set<?>, Map<?, ?>>(p0) {
 588
 589                         @Override
 590                         public Map<?, ?> perform(ReadGraph graph) throws DatabaseException {
 591                             ModelingResources MOD = ModelingResources.getInstance(graph);
 592                             DiagramResource DIA = DiagramResource.getInstance(graph);
 593                             Layer0 L0 = Layer0.getInstance(graph);
 594                             return parameter.stream().collect(Collectors.toMap(p -> p, p -> {
 595                                 try {
 596                                     if (p instanceof Resource) {
 597                                         Resource element = (Resource) p;
 598                                         if (graph.isInstanceOf(element, DIA.Element)) {
 599                                             Resource component = graph.getPossibleObject(element, MOD.ElementToComponent);
 600                                             if (component != null) {
 601                                                 GUID identifier = graph.getPossibleRelatedValue(component, L0.identifier, GUID.BINDING);
 602                                                 if (identifier != null) {
 603                                                     return Arrays.toString(createURIBasedL0Identifier(graph, component));
 604                                                 } else {
 605                                                     LOGGER.error("Component {} does not have GUID identifier!", component);
 606                                                 }
 607                                             } else if (graph.isInstanceOf(element, DIA.Connection) || graph.isInstanceOf(element, DIA.Terminal)) {
 608                                                 // Ok, lets create a hashcode for connections and terminals as they do not have identifiers
 609                                                 return graph.getURI(element).hashCode();
 610                                             } else {
 611                                                 // Ok, lets create a hashcode or either return empty string in cases where no ID is required
 612                                                 if (graph.hasStatement(element, L0.HasName))
 613                                                     return graph.getURI(element).hashCode();
 614                                                 return "";
 615                                             }
 616                                         }
 617                                     } else {
 618                                         LOGGER.error("Parameter p {} is not resource but it is {}", p, p.getClass());
 619                                     }
 620                                     return p;
 621                                 } catch (DatabaseException e) {
 622                                     throw new RuntimeDatabaseException(e);
 623                                 }
 624                             }));
 625                         }
 626                     });
 627                 } catch (DatabaseException e) {
 628                     LOGGER.error("Could not apply mappings", e);
 629                     throw new RuntimeDatabaseException(e);
 630                 }
 631             }
 632         });
 633         }
 634
 635     static class RenderSVGContext {
 636
 637         Map<String,StringBuilder> documents = new HashMap<>();
 638
 639         public void append(String[] keys, String svgText) {
 640                 for(String key : keys) append(key, svgText);
 641         }
 642
 643         public void append(String key, String svgText) {
 644                 StringBuilder builder = documents.get(key);
 645                 if(builder == null) {
 646                         builder = new StringBuilder();
 647                         documents.put(key, builder);
 648                 }
 649                 builder.append(svgText);
 650         }
 651
 652         public void append(RenderSVGContext other) {
 653                 for(String key : other.documents.keySet()) {
 654                         append(key, other.get(key));
 655                 }
 656         }
 657
 658         public String get(String key) {
 659                 StringBuilder builder = documents.get(key);
 660                 if(builder == null) return "";
 661                 else return builder.toString();
 662         }
 663
 664     }
 665
 666
 667
 668         private static String renderSVG0(double width, double height, ICanvasContext ctx, Function1<Set<?>, Map<?, ?>> mappingFunction) {
 669
 670                 // Get a DOMImplementation.
 671                 DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();
 672
 673                 // Create an instance of org.w3c.dom.Document.
 674                 String svgNS = "http://www.w3.org/2000/svg";
 675                 Document document = domImpl.createDocument(svgNS, "svg", null);
 676
 677                 // Create an instance of the SVG Generator.
 678                 IDiagram d = ctx.getDefaultHintContext().getHint(DiagramHints.KEY_DIAGRAM);
 679                 Resource r = d.getHint(DiagramModelHints.KEY_DIAGRAM_RESOURCE);
 680                 SVGGraphics2D svgGenerator;
 681                 if (r != null)
 682                         svgGenerator = new Generator(document,r.toString());
 683                 else
 684                         svgGenerator = new Generator(document);
 685
 686                 RenderSVGContext result = new RenderSVGContext();
 687
 688                 double[] matrix = new double[6];
 689                 try {
 690
 691             Selection selection = ctx.getAtMostOneItemOfClass(Selection.class);
 692             if (selection != null) {
 693                 // This prevents workbench selection from being left over.
 694                 // Also prevents scene graph crap from being left on the screen.
 695                 selection.setSelection(0, d.getElements());
 696             }
 697
 698                         G2DSceneGraph sg = ctx.getSceneGraph();
 699                         sg.performCleanup();
 700                         G2DParentNode root = (G2DParentNode) sg.getRootNode();
 701
 702                         // rtree is the actual content of the diagram
 703                         RTreeNode rtree = NodeUtil.getNearestChildByClass(root, RTreeNode.class);
 704                         Rectangle2D rtreeBounds = NodeUtil.getLocalBounds(rtree);
 705
 706                         // get the bounds of the content
 707                         Rectangle2D content = rtreeBounds;
 708
 709
 710                         if (content != null) {
 711                          // To account for dynamic padding of selection rectangles (5 units + stroke width)
 712                     int offset = 6;
 713
 714                     double scale = width < 0 || height < 0 ? 1.0 : Math.min((width - 2*offset) / content.getWidth(), (height - 2*offset) / content.getHeight());
 715
 716                     AffineTransform tr = new AffineTransform();
 717                     tr.translate(offset, offset);
 718                     tr.scale(scale, scale);
 719                             tr.translate(-content.getX(), -content.getY());
 720                             tr.getMatrix(matrix);
 721                             svgGenerator.setSVGCanvasSize(new Dimension((int)Math.ceil(scale * content.getWidth()) + 2*offset, (int)Math.ceil(scale * content.getHeight()) + 2*offset));
 722                         } else {
 723                             svgGenerator.setSVGCanvasSize(new Dimension(100, 100));
 724                         }
 725                         //svgGenerator.translate(offset, offset);
 726                         //svgGenerator.scale(scale, scale);
 727                         // translate svgGenerator to the x and y coordinates of current content
 728                         //svgGenerator.translate(-content.getX(), -content.getY());
 729
 730
 731                         //svgGenerator.setClip(content);
 732
 733                         result.append(MAIN_SECTION, "<g class=\"symbols\">");
 734                         result.append(SELECTION_SECTION, "<g class=\"selections\">");
 735                         result.append(SELECTION_MASK_SECTION, "<g class=\"selectionMasks\">");
 736
 737                         KeyVisitor keyVisitor = new KeyVisitor();
 738                         sg.accept(keyVisitor);
 739
 740                         Set<Object> keys = keyVisitor.getKeys();
 741
 742                         Map<?, ?> mappings = mappingFunction.apply(keys);
 743
 744                         IG2DNodeVisitor visitor = new PrintingVisitor(svgGenerator, result, mappings);
 745
 746                         sg.accept(visitor);
 747
 748                 } catch (Throwable t) {
 749                         LOGGER.error("Problems rendering canvas context to SVG", t);
 750                 }
 751
 752
 753                 result.append(ALL_SECTIONS, "</g>");
 754
 755                 StringBuilder res = new StringBuilder();
 756                 if (width > 0 && height > 0 ) {
 757                         res.append("<svg width=\"" + width +"px\" height=\""+height+"px\" stroke=\"black\" xmlns=\"http://www.w3.org/2000/svg\">");
 758                 } else {
 759                         res.append("<svg width=\"100%\" height=\"100%\" stroke=\"black\" xmlns=\"http://www.w3.org/2000/svg\">");
 760                 }
 761                 res.append("<g transform=\"matrix(").append(matrix[0]).append(",").append(matrix[1]).append(",").append(matrix[2]).append(",").append(matrix[3]).append(",").append(matrix[4]).append(",").append(matrix[5]).append(")\">");
 762                 res.append(result.get(MAIN_SECTION));
 763                 res.append(result.get(SELECTION_SECTION));
 764                 res.append(result.get(SELECTION_MASK_SECTION));
 765                 res.append("</g>");
 766                 res.append("</svg>");
 767
 768 //              System.err.println(" == FINAL RESULT == ");
 769 //              System.err.println(res.toString());
 770
 771                 return res.toString();
 772
 773         }
 774
 775
 776
 777         private static class KeyVisitor implements IG2DNodeVisitor {
 778
 779         private Set<Object> keys = new HashSet<>();
 780
 781         @Override
 782         public void enter(IG2DNode node) {
 783             if (node instanceof SingleElementNode) {
 784                 Object key = ((SingleElementNode) node).getKey();
 785                 if (key != null) {
 786                     keys.add(key);
 787                 }
 788             }
 789         }
 790
 791         @Override
 792         public void leave(IG2DNode node) {
 793             // Nothing to do
 794         }
 795
 796         public Set<Object> getKeys() {
 797             return keys;
 798         }
 799         }
 800
 801         private static class PrintingVisitor implements IG2DNodeVisitor {
 802
 803         int indent = 0;
 804
 805         HashMap<SingleElementNode,RenderSVGContext> senBuilders = new HashMap<>();
 806
 807         private RenderSVGContext result;
 808         private SVGGraphics2D svgGenerator;
 809
 810         private Map<?, ?> mappings;
 811
 812         public PrintingVisitor(SVGGraphics2D svgGenerator, RenderSVGContext result, Map<?, ?> mappings) {
 813             this.result = result;
 814             this.mappings = mappings;
 815             this.svgGenerator = svgGenerator;
 816         }
 817
 818         private String getKey(SingleElementNode node) {
 819             String key;
 820                 if(node.getKey() != null) {
 821                 if (mappings.containsKey(node.getKey())) {
 822                     key = mappings.get(node.getKey()).toString();
 823                     key = escape(key);
 824                 } else {
 825                     key = node.getKey().toString();
 826                     key = escape(key);
 827                 }
 828                 } else {
 829                         key = Long.toString(node.getId());
 830                 }
 831             return key;
 832         }
 833
 834         private String escape(String key) {
 835                 // Keys may contain  '<' '>' characters, which causes errors in browser SVG handling.
 836                 return org.apache.commons.lang.StringEscapeUtils.escapeHtml(key);
 837         }
 838
 839         private String removeElem(String xml, String elemStart) {
 840                 // FIXME: This is rather nasty and error prone way of removing elements from XML string.
 841                 // This only supports elements with /> end element tag. Elements ends with </elem name> are not supported!
 842                 int start = xml.indexOf("<"+elemStart);
 843                 if (start>=0) {
 844                         int end = xml.indexOf(">",start);
 845                         if (end >= 0) {
 846                                 if (start > 0)
 847                                         return xml.substring(0,start)+xml.substring(end+1);
 848                                 else
 849                                         return xml.substring(end+1);
 850                         }
 851                 }
 852                 return null;
 853         }
 854
 855         @Override
 856         public void enter(IG2DNode node) {
 857
 858                 RenderSVGContext parentBuilder = getParentBuilder(node);
 859
 860             indent++;
 861             if(node instanceof ConnectionNode) {
 862
 863                 for(RouteGraphNode n : NodeUtil.collectNodes(node, RouteGraphNode.class)) {
 864                     n.setIgnoreSelection(true);
 865                 }
 866
 867                 String key = getKey((ConnectionNode) node);
 868                 parentBuilder.append(MAIN_SECTION, "\n<g class=\"connection\" id=\"" + key + "\">");
 869                 parentBuilder.append(SELECTION_SECTION, "\n<g style=\"visibility:hidden\" class=\"selection\" id=\"" + key + "\">");
 870                 parentBuilder.append(SELECTION_MASK_SECTION, "\n<g class=\"selectionMask\" opacity=\"" + OPACITY + "\" id=\"" + key + "\">");
 871
 872                 Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 873                 String svg = printSVGDocument(doc);
 874                 parentBuilder.append(MAIN_SECTION, svg);
 875
 876                 for(RouteGraphNode n : NodeUtil.collectNodes(node, RouteGraphNode.class)) {
 877                     n.setIgnoreSelection(false);
 878                 }
 879
 880                 doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 881                 svg = printSVGDocument(doc);
 882                 parentBuilder.append(SELECTION_SECTION, svg);
 883
 884                 BasicStroke bs = new BasicStroke(10f);
 885
 886                 for(RouteGraphNode n : NodeUtil.collectNodes(node, RouteGraphNode.class)) {
 887                     n.setDynamicStroke(bs);
 888                 }
 889
 890                 doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 891                 svg = printSVGDocument(doc);
 892                 parentBuilder.append(SELECTION_MASK_SECTION, svg);
 893
 894                 parentBuilder.append(SELECTION_MASK_SECTION, "\n</g>");
 895                 parentBuilder.append(SELECTION_SECTION, "\n</g>");
 896                 parentBuilder.append(MAIN_SECTION, "\n</g>");
 897
 898             } else if (isSelection0(node)) {
 899
 900                 SelectionNode n = (SelectionNode)node;
 901                 SingleElementNode parentSEN = (SingleElementNode)NodeUtil.getNearestParentOfType(node, SingleElementNode.class);
 902                 if(parentSEN != null) {
 903
 904                         RenderSVGContext parentBuilder2 = getParentBuilder(parentSEN);
 905
 906                     String key = getKey(parentSEN);
 907                     n.setIgnore(false);
 908                     Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 909                     n.setIgnore(true);
 910                     String svg = printSVGDocument(doc);
 911                     parentBuilder2.append(SELECTION_SECTION, "\n<g style=\"visibility:hidden\" class=\"selection\" id=\"" + key + "\">");
 912                     parentBuilder2.append(SELECTION_SECTION, svg);
 913                     parentBuilder2.append(SELECTION_SECTION, "\n</g>");
 914                     parentBuilder2.append(SELECTION_MASK_SECTION, "\n<g class=\"selectionMask\" id=\"" + key /*+ "\" transform=\"" + matrixString + "\"*/+ "\">");
 915                     Rectangle2D rect = n.getRect();
 916                     // NaN
 917                     if(rect.getHeight() == rect.getHeight() && rect.getWidth() == rect.getWidth()) {
 918                             parentBuilder2.append(SELECTION_MASK_SECTION,"<rect style=\"fill:#fff\" opacity=\"" + OPACITY + "\"");
 919                             parentBuilder2.append(SELECTION_MASK_SECTION," x=\"" + rect.getX() + "\" y=\"" + rect.getY() + "\"");
 920                             parentBuilder2.append(SELECTION_MASK_SECTION," width=\"" + rect.getWidth() + "\" height=\"" + rect.getHeight() + "\"");
 921                             parentBuilder2.append(SELECTION_MASK_SECTION,"></rect>");
 922                     }
 923                     parentBuilder2.append(SELECTION_MASK_SECTION,"\n</g>");
 924
 925                 }
 926             } else if (node instanceof SelectionNode) {
 927
 928                 Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 929                 String svg = printSVGDocument(doc);
 930                 parentBuilder.append(MAIN_SECTION, "<g>");
 931                 parentBuilder.append(MAIN_SECTION, svg);
 932                 parentBuilder.append(MAIN_SECTION, "\n</g>");
 933
 934             } else if (node instanceof SVGNode) {
 935                 SVGNode svg = (SVGNode)node;
 936                 AffineTransform at = svg.getTransform();
 937                 if (!at.isIdentity()) {
 938                          if(at.getScaleX() == 1.0 && at.getScaleY() == 1.0 && at.getShearX() == 0.0 && at.getShearY() == 0.0) {
 939                          String m = "translate(" + at.getTranslateX() + " " + at.getTranslateY() + ")";
 940                          parentBuilder.append(MAIN_SECTION, "\n<g transform=\"" + m + "\">");
 941                      } else {
 942                          double[] ds = new double[6];
 943                          at.getMatrix(ds);
 944                          String m = "matrix(" + ds[0] + " " + ds[1] + " " + ds[2] + " " + ds[3] + " " + ds[4] + " " + ds[5] + ")";
 945                          parentBuilder.append(MAIN_SECTION, "\n<g transform=\"" + m + "\">");
 946                      }
 947                 }
 948                 String svgContent = svg.getSVGText();
 949                 // SVGNode content may contain SVG/XML elements, which break browser compatibility
 950                 int start = svgContent.indexOf("<svg");
 951                 if (start >= 0)
 952                         svgContent = svgContent.substring(start);
 953                 else  {
 954                         String s = removeElem(svgContent, "?xml");
 955                         if (s != null) {
 956                                 svgContent = "<g>"+s+"</g>";
 957                                 s = removeElem(svgContent, "!DOCTYPE");
 958                                 if (s != null)
 959                                         svgContent = s;
 960                         }
 961                 }
 962                 parentBuilder.append(MAIN_SECTION, svgContent);
 963                 if (!at.isIdentity()) {
 964                         parentBuilder.append(MAIN_SECTION, "\n</g>");
 965                 }
 966             } else if (node instanceof G2DParentNode) {
 967                 AffineTransform at = node.getTransform();
 968                 if(node instanceof SingleElementNode) {
 969                     SingleElementNode sen = (SingleElementNode)node;
 970                     String key = getKey(sen);
 971                     String typeClass = sen.getTypeClass();
 972                     String clazz = "definedElement";
 973                     if(typeClass != null && !typeClass.isEmpty())
 974                         clazz = clazz + " " + typeClass;
 975
 976                     parentBuilder.append(MAIN_SECTION, "\n<g class=\""+clazz+"\" id=\"" + key + "\">");
 977                     senBuilders.put(sen, new RenderSVGContext());
 978                 }
 979                 if(!at.isIdentity()) {
 980                     if(at.getScaleX() == 1.0 && at.getScaleY() == 1.0 && at.getShearX() == 0.0 && at.getShearY() == 0.0) {
 981                         String m = "translate(" + at.getTranslateX() + " " + at.getTranslateY() + ")";
 982                         parentBuilder.append(ALL_SECTIONS, "\n<g transform=\"" + m + "\">");
 983                     } else {
 984                         double[] ds = new double[6];
 985                         at.getMatrix(ds);
 986                         String m = "matrix(" + ds[0] + " " + ds[1] + " " + ds[2] + " " + ds[3] + " " + ds[4] + " " + ds[5] + ")";
 987                         parentBuilder.append(ALL_SECTIONS, "\n<g transform=\"" + m + "\">");
 988                     }
 989                 }
 990             } else if (node instanceof TextNode) {
 991                  TextNode text = (TextNode)node;
 992
 993                  SingleElementNode parentSEN = (SingleElementNode)NodeUtil.getNearestParentOfType(node, SingleElementNode.class);
 994                  if(parentSEN != null) {
 995
 996                          text.setShowSelection(false);
 997                          Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 998                      String svg = printSVGDocument(doc);
 999                      parentBuilder.append(MAIN_SECTION, svg);
1000
1001                          RenderSVGContext parentBuilder2 = getParentBuilder(parentSEN);
1002
1003                      String key = getKey(parentSEN);
1004                      text.setShowSelection(true);
1005                      doc = renderSVGNode(svgGenerator, (IG2DNode)node);
1006                      svg = printSVGDocument(doc);
1007
1008                      parentBuilder2.append(SELECTION_SECTION, "\n<g style=\"visibility:hidden\" class=\"selection\" id=\"" + key + "\">");
1009                      parentBuilder2.append(SELECTION_SECTION, svg);
1010                      parentBuilder2.append(SELECTION_SECTION, "\n</g>");
1011                      parentBuilder2.append(SELECTION_MASK_SECTION, "\n<g class=\"selectionMask\" id=\"" + key /*+ "\" transform=\"" + matrixString + "\"*/+ "\">");
1012                      Rectangle2D rect = text.getBounds();
1013                      // NaN
1014                      if(rect.getHeight() == rect.getHeight() && rect.getWidth() == rect.getWidth()) {
1015                             parentBuilder2.append(SELECTION_MASK_SECTION,"<rect style=\"fill:#fff\" opacity=\"" + OPACITY + "\"");
1016                             parentBuilder2.append(SELECTION_MASK_SECTION," x=\"" + rect.getX() + "\" y=\"" + rect.getY() + "\"");
1017                             parentBuilder2.append(SELECTION_MASK_SECTION," width=\"" + rect.getWidth() + "\" height=\"" + rect.getHeight() + "\"");
1018                             parentBuilder2.append(SELECTION_MASK_SECTION,"></rect>");
1019                      }
1020                      parentBuilder2.append(SELECTION_MASK_SECTION,"\n</g>");
1021
1022                  }
1023             } else if (!(node instanceof RouteGraphNode) && !(node instanceof LinkNode)){
1024                 try {
1025                         Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
1026                         NodeList gList = doc.getElementsByTagName("g");
1027                         if (gList.getLength() == 0)
1028                                 return;
1029                         boolean hasContent = false;
1030                         for (int i = 0; i < gList.getLength(); i++) {
1031                             Node gNode = gList.item(i);
1032                             if (gNode.hasChildNodes()) {
1033                                 hasContent = true;
1034                                 break;
1035                             }
1036                         }
1037                         if (!hasContent)
1038                             return;
1039                         String svg = printSVGDocument(doc);
1040                         if (node instanceof SelectionShapeNode) {
1041                                 SingleElementNode parentSEN = (SingleElementNode)NodeUtil.getNearestParentOfType(node, SingleElementNode.class);
1042                         if(parentSEN != null) {
1043                                  String key = getKey(parentSEN);
1044                                  RenderSVGContext parentBuilder2 = getParentBuilder(parentSEN);
1045                                  parentBuilder2.append(SELECTION_SECTION, "\n<g style=\"visibility:hidden\" class=\"selection\" id=\"" + key + "\">");
1046                              parentBuilder2.append(SELECTION_SECTION, svg);
1047                              parentBuilder2.append(SELECTION_SECTION, "\n</g>");
1048
1049                              parentBuilder2.append(SELECTION_MASK_SECTION, "\n<g class=\"selectionMask\" id=\"" + key /*+ "\" transform=\"" + matrixString + "\"*/+ "\">");
1050                              Rectangle2D rect = node.getBounds();
1051                              // NaN
1052                              if(rect.getHeight() == rect.getHeight() && rect.getWidth() == rect.getWidth()) {
1053                                     parentBuilder2.append(SELECTION_MASK_SECTION,"<rect style=\"fill:#fff\" opacity=\"" + OPACITY + "\"");
1054                                     parentBuilder2.append(SELECTION_MASK_SECTION," x=\"" + rect.getX() + "\" y=\"" + rect.getY() + "\"");
1055                                     parentBuilder2.append(SELECTION_MASK_SECTION," width=\"" + rect.getWidth() + "\" height=\"" + rect.getHeight() + "\"");
1056                                     parentBuilder2.append(SELECTION_MASK_SECTION,"></rect>");
1057                              }
1058                              parentBuilder2.append(SELECTION_MASK_SECTION,"\n</g>");
1059                         }
1060                         } else {
1061                                 parentBuilder.append(MAIN_SECTION, "<g class=\"" +node.getSimpleClassName() +"\">");
1062                                 parentBuilder.append(MAIN_SECTION, svg);
1063                                 parentBuilder.append(MAIN_SECTION, "\n</g>");
1064                         }
1065                 } catch (Exception e) {
1066                         // TODO: There are nodes that do not behave well when rendered to SVG. For backwards compatibility, we don't handle the exceptions.
1067                 }
1068             }
1069
1070             //enters.put(node, b.length());
1071
1072         }
1073
1074         private boolean isSelection0(IG2DNode node) {
1075
1076             if(node instanceof SelectionNode) {
1077                 SelectionNode sn = (SelectionNode)node;
1078                 return sn.getSelectionId() == 0;
1079             } else {
1080                 return false;
1081             }
1082
1083         }
1084
1085         private RenderSVGContext getParentBuilder(IG2DNode node) {
1086
1087             INode parentSEN = NodeUtil.getNearestParentOfType(node, SingleElementNode.class);
1088             if(parentSEN instanceof G2DSceneGraph) return result;
1089
1090             RenderSVGContext parentBuilder = senBuilders.get(parentSEN);
1091             if(parentBuilder == null) return result;
1092
1093             return parentBuilder;
1094
1095         }
1096
1097         @Override
1098         public void leave(IG2DNode node) {
1099
1100             if(node instanceof ConnectionNode || node instanceof SVGNode) {
1101                 // We are done
1102             } else if (node instanceof G2DParentNode) {
1103
1104                 RenderSVGContext parentBuilder = getParentBuilder(node);
1105
1106                 if(node instanceof SingleElementNode) {
1107                         SingleElementNode sen = (SingleElementNode)node;
1108                         RenderSVGContext b = senBuilders.get(sen);
1109                         String content = b.get(MAIN_SECTION);
1110                         if(content.isEmpty()) {
1111                                 if(sen.getKey() != null) {
1112
1113                                         for(SelectionNode n : NodeUtil.collectNodes(node, SelectionNode.class)) {
1114                                                 n.setIgnore(true);
1115                                         }
1116
1117                                         Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
1118                                         String svg = printSVGDocument(doc);
1119                                         parentBuilder.append(MAIN_SECTION, svg);
1120                                 }
1121                         } else {
1122                                 parentBuilder.append(b);
1123                         }
1124                 }
1125
1126                 AffineTransform at = node.getTransform();
1127                 if(!at.isIdentity()) {
1128                     parentBuilder.append(ALL_SECTIONS, "</g>");
1129                 }
1130                 if(node instanceof SingleElementNode) {
1131                     SingleElementNode sen = (SingleElementNode)node;
1132                     //if(sen.getKey() != null) {
1133                         parentBuilder.append(MAIN_SECTION, "</g>");
1134                     //}
1135                 }
1136             }
1137             indent --;
1138         }
1139         }
1140 }