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.nio.charset.Charset;
  13 import java.util.ArrayList;
  14 import java.util.Arrays;
  15 import java.util.Collection;
  16 import java.util.HashMap;
  17 import java.util.HashSet;
  18 import java.util.List;
  19 import java.util.Map;
  20 import java.util.Random;
  21 import java.util.Set;
  22 import java.util.UUID;
  23 import java.util.function.Function;
  24 import java.util.stream.Collectors;
  25
  26 import javax.xml.transform.OutputKeys;
  27 import javax.xml.transform.Transformer;
  28 import javax.xml.transform.TransformerFactory;
  29 import javax.xml.transform.dom.DOMSource;
  30 import javax.xml.transform.stream.StreamResult;
  31
  32 import org.apache.batik.dom.GenericDOMImplementation;
  33 import org.apache.batik.svggen.SVGGeneratorContext;
  34 import org.apache.batik.svggen.SVGGraphics2D;
  35 import org.apache.batik.svggen.SVGIDGenerator;
  36 import org.eclipse.swt.SWT;
  37 import org.simantics.Simantics;
  38 import org.simantics.datatypes.literal.GUID;
  39 import org.simantics.db.ReadGraph;
  40 import org.simantics.db.Resource;
  41 import org.simantics.db.common.request.IndexRoot;
  42 import org.simantics.db.common.request.ResourceRead;
  43 import org.simantics.db.common.request.UnaryRead;
  44 import org.simantics.db.exception.DatabaseException;
  45 import org.simantics.db.exception.RuntimeDatabaseException;
  46 import org.simantics.db.layer0.variable.Variables;
  47 import org.simantics.diagram.elements.DecorationSVGNode;
  48 import org.simantics.diagram.elements.DiagramNodeUtil;
  49 import org.simantics.diagram.elements.TextGridNode;
  50 import org.simantics.diagram.elements.TextNode;
  51 import org.simantics.diagram.stubs.DiagramResource;
  52 import org.simantics.diagram.ui.DiagramModelHints;
  53 import org.simantics.g2d.canvas.Hints;
  54 import org.simantics.g2d.canvas.ICanvasContext;
  55 import org.simantics.g2d.diagram.DiagramHints;
  56 import org.simantics.g2d.diagram.IDiagram;
  57 import org.simantics.g2d.diagram.handler.DataElementMap;
  58 import org.simantics.g2d.diagram.participant.ElementPainter.SelectionShapeNode;
  59 import org.simantics.g2d.diagram.participant.Selection;
  60 import org.simantics.g2d.element.IElement;
  61 import org.simantics.g2d.scenegraph.ICanvasSceneGraphProvider;
  62 import org.simantics.g2d.utils.CanvasUtils;
  63 import org.simantics.layer0.Layer0;
  64 import org.simantics.scenegraph.INode;
  65 import org.simantics.scenegraph.ParentNode;
  66 import org.simantics.scenegraph.g2d.G2DParentNode;
  67 import org.simantics.scenegraph.g2d.G2DRenderingHints;
  68 import org.simantics.scenegraph.g2d.G2DSceneGraph;
  69 import org.simantics.scenegraph.g2d.IG2DNode;
  70 import org.simantics.scenegraph.g2d.IG2DNodeVisitor;
  71 import org.simantics.scenegraph.g2d.events.command.Commands;
  72 import org.simantics.scenegraph.g2d.nodes.BackgroundNode;
  73 import org.simantics.scenegraph.g2d.nodes.BoundsNode;
  74 import org.simantics.scenegraph.g2d.nodes.ConnectionNode;
  75 import org.simantics.scenegraph.g2d.nodes.DataNode;
  76 import org.simantics.scenegraph.g2d.nodes.LinkNode;
  77 import org.simantics.scenegraph.g2d.nodes.NavigationNode;
  78 import org.simantics.scenegraph.g2d.nodes.SVGNode;
  79 import org.simantics.scenegraph.g2d.nodes.SelectionNode;
  80 import org.simantics.scenegraph.g2d.nodes.SingleElementNode;
  81 import org.simantics.scenegraph.g2d.nodes.connection.RouteGraphNode;
  82 import org.simantics.scenegraph.g2d.nodes.spatial.RTreeNode;
  83 import org.simantics.scenegraph.utils.NodeUtil;
  84 import org.simantics.scl.runtime.function.Function1;
  85 import org.simantics.scl.runtime.tuple.Tuple2;
  86 import org.simantics.trend.impl.ItemNode;
  87 import org.simantics.utils.threads.ThreadUtils;
  88 import org.slf4j.Logger;
  89 import org.slf4j.LoggerFactory;
  90 import org.w3c.dom.DOMImplementation;
  91 import org.w3c.dom.Document;
  92 import org.w3c.dom.Element;
  93 import org.w3c.dom.Node;
  94 import org.w3c.dom.NodeList;
  95
  96 public class SCLScenegraph {
  97
  98         private static final Logger LOGGER = LoggerFactory.getLogger(SCLScenegraph.class);
  99
 100         private static final String MAIN_SECTION = "main";
 101         private static final String SELECTION_SECTION = "selection";
 102         private static final String SELECTION_MASK_SECTION = "selectionMask";
 103
 104         private static final String[] ALL_SECTIONS = { MAIN_SECTION, SELECTION_SECTION, SELECTION_MASK_SECTION };
 105
 106         // Changed from 0.001 to 0.0001 to prevent creation of huge BufferedImage's when
 107         // generating PDF from SVG. If SVG contains any transparency then Batik uses
 108         // bitmap-rendering which remarkably slows things down
 109         // See org.apache.batik.gvt.AbstractGraphicsNode.paint(Graphics2D) where decisions are made
 110         // if AlphaComposite should be painted
 111         private static final String OPACITY = "0.0001";
 112
 113         @Deprecated
 114         public static ICanvasSceneGraphProvider getICanvasSceneGraphProvider(Resource model, Resource diagram, String diagramRVI) throws DatabaseException, InterruptedException {
 115                 ICanvasSceneGraphProvider provider = DiagramNodeUtil.loadSceneGraphProvider(model, diagram, diagramRVI);
 116                 return provider;
 117         }
 118
 119         @Deprecated
 120         public static void disposeSceneGraphProvider(ICanvasSceneGraphProvider provider) {
 121                 provider.dispose();
 122         }
 123
 124     public static <T> T doWithICanvasSceneGraphProvider(Resource diagram, Function1<ICanvasSceneGraphProvider, T> func) throws DatabaseException {
 125         return doWithICanvasSceneGraphProvider(diagram, (Function<ICanvasSceneGraphProvider, T>) provider -> func.apply(provider));
 126     }
 127
 128     public static <T> T doWithICanvasSceneGraphProvider(Resource diagram, Function<ICanvasSceneGraphProvider, T> func) throws DatabaseException {
 129         Tuple2 result = Simantics.getSession().syncRequest(new ResourceRead<Tuple2>(diagram) {
 130
 131             @Override
 132             public Tuple2 perform(ReadGraph graph) throws DatabaseException {
 133                 Resource indexRoot = graph.syncRequest(new IndexRoot(resource));
 134                 String diagramRVI = Variables.getRVI(graph, resource);
 135                 return new Tuple2(indexRoot, diagramRVI);
 136             }
 137         });
 138         ICanvasSceneGraphProvider provider = DiagramNodeUtil.loadSceneGraphProvider((Resource) result.c0, diagram, (String) result.c1);
 139         try {
 140             return func.apply(provider);
 141         } finally {
 142             provider.dispose();
 143         }
 144     }
 145
 146     public static <T> T doWithCanvasContext(Resource diagram, Function1<ICanvasContext, T> func) throws DatabaseException {
 147         return doWithCanvasContext(diagram, (Function<ICanvasContext, T>) canvasContext -> func.apply(canvasContext));
 148     }
 149
 150     public static <T> T doWithCanvasContext(Resource diagram, Function<ICanvasContext, T> func) throws DatabaseException {
 151         return doWithICanvasSceneGraphProvider(diagram, (Function<ICanvasSceneGraphProvider, T>) provider -> func.apply(provider.getCanvasContext()));
 152     }
 153
 154         public static String getNodeTransform(ICanvasContext ctx, String name) {
 155
 156                 Set<TextNode> texts = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 157                 for (TextNode text : texts) {
 158                         String nodeName = NodeUtil.getNodeName(text);
 159                         if (nodeName.equals(name)) {
 160                                 String transform = text.getTransform().toString();
 161                                 return transform;
 162                         }
 163                 }
 164                 return "No node found";
 165         }
 166
 167         public static String getNodeText(ICanvasContext ctx, String name) {
 168
 169                 Set<TextNode> texts = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 170                 for (TextNode text : texts) {
 171                         String nodeName = NodeUtil.getNodeName(text);
 172                         if (nodeName.equals(name)) {
 173                                 String texti = text.getText();
 174                                 return texti;
 175                         }
 176                 }
 177                 return "No node found";
 178         }
 179
 180         public static String getNodeCount(ICanvasContext ctx) {
 181                 G2DSceneGraph g2 = ctx.getSceneGraph();
 182                 int amount = NodeUtil.countTreeNodes(g2);
 183                 return "Node count: " + amount;
 184         }
 185
 186     public static String getAllNodes (ICanvasContext ctx) {
 187
 188         Set<G2DSceneGraph> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), G2DSceneGraph.class);
 189         int amount = g2.size() +1;
 190         return "All nodes: " + amount;
 191     }
 192
 193     public static String getBoundsNodes (ICanvasContext ctx) {
 194
 195         Set<BoundsNode> bn = NodeUtil.collectNodes(ctx.getSceneGraph(), BoundsNode.class);
 196         int amount = bn.size();
 197         return "BoundsNodes: " + amount;
 198     }
 199
 200     public static String getBackgroundNodes (ICanvasContext ctx) {
 201
 202         Set<BackgroundNode> bg = NodeUtil.collectNodes(ctx.getSceneGraph(), BackgroundNode.class);
 203         int amount = bg.size();
 204         return "BackgroundNodes: " + amount;
 205     }
 206
 207     public static String getDataNodes (ICanvasContext ctx) {
 208
 209         Set<DataNode> dn = NodeUtil.collectNodes(ctx.getSceneGraph(), DataNode.class);
 210         int amount = dn.size();
 211         return "DataNodes: " + amount;
 212     }
 213
 214     public static String getNavigationNodes (ICanvasContext ctx) {
 215
 216         Set<NavigationNode> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), NavigationNode.class);
 217         int amount = g2.size();
 218         return "NavigationNodes: " + amount;
 219     }
 220
 221     public static String getParentNodes (ICanvasContext ctx) {
 222
 223         Set<G2DParentNode> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), G2DParentNode.class);
 224         int amount = g2.size();
 225         return "ParentNodes: " + amount;
 226     }
 227
 228     public static String getDecorationNodes (ICanvasContext ctx) {
 229
 230         Set<DecorationSVGNode> deco = NodeUtil.collectNodes(ctx.getSceneGraph(), DecorationSVGNode.class);
 231         int amount = deco.size();
 232         return "DecorationNodes: " + amount;
 233     }
 234
 235     public static String getSingleElementNodes (ICanvasContext ctx) {
 236
 237         Set<SingleElementNode> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), SingleElementNode.class);
 238         int amount = g2.size();
 239         return "SingleElementNodes: " + amount;
 240     }
 241
 242     public static String getConnectionNodes (ICanvasContext ctx) {
 243
 244         Set<ConnectionNode> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), ConnectionNode.class);
 245         int amount = g2.size();
 246         return "ConnectionNodes: " + amount;
 247     }
 248
 249     public static String getTextNodes (ICanvasContext ctx) {
 250
 251         Set<TextNode> tn = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 252         Set<TextGridNode> tgn = NodeUtil.collectNodes(ctx.getSceneGraph(), TextGridNode.class);
 253         int amount = tn.size() + tgn.size();
 254         return "TextNodes: " + amount;
 255     }
 256
 257     public static String getItemNodes (ICanvasContext ctx) {
 258
 259         Set<ItemNode> item = NodeUtil.collectNodes(ctx.getSceneGraph(), ItemNode.class);
 260         int amount = item.size();
 261         return "ItemNodes: " + amount;
 262     }
 263
 264     public static String editNodeText (ICanvasContext ctx, String module, String previous_value, String new_value) {
 265
 266         Set<TextNode> textGridNodes = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 267         for (TextNode modulenode : textGridNodes) {
 268                 if (module.equals(modulenode.getText())) {
 269                         //System.out.println("Module what we were looking for: " + module);
 270                         //System.out.println("Modulenode: " + modulenode.getText());
 271
 272                         ParentNode<?> parentnode = modulenode.getParent();
 273                         //System.out.println("Parentnode: " + parentnode);
 274
 275                         Collection<TextNode> textnodes = (Collection<TextNode>) parentnode.getNodes();
 276                         for (TextNode valuenode : textnodes) {
 277                                 if (previous_value.equals(valuenode.getText())) {
 278                                         //System.out.println("Value what we were looking for: " + previous_value);
 279                                         //System.out.println("Valuenode: " + valuenode.getText());
 280
 281                                         //valuenode.setEditMode(true);
 282                                         valuenode.activateEdit(0, null, ctx);
 283                                         valuenode.setText(new_value);
 284                                         valuenode.fireTextEditingEnded();
 285
 286                                         //System.out.println("valuenode modified: " + valuenode);
 287                                         return "Modified module " + module + " with value " + new_value;
 288                                 }
 289                         }
 290                         return "Not found module : " + module;
 291                 }
 292         }
 293         return "No nodes in scenegraph!";
 294     }
 295
 296     /**
 297      * Returns background color of a canvasContext or null.
 298      * @param ctx
 299      * @return color in RGBA List<Integer> format, or null.
 300      */
 301     public static List<Integer> getBackgroundColor(ICanvasContext ctx) {
 302         Color color = ctx.getDefaultHintContext().getHint(Hints.KEY_BACKGROUND_COLOR);
 303         if (color == null)
 304                 return null;
 305         ArrayList<Integer> rgba = new ArrayList<>(4);
 306         rgba.add(color.getRed());
 307         rgba.add(color.getGreen());
 308         rgba.add(color.getBlue());
 309         rgba.add(color.getAlpha());
 310         return rgba;
 311     }
 312
 313     public static String sceneGraphTest (ICanvasContext ctx, String module, String value) {
 314
 315         boolean module_founded = false;
 316         boolean value_founded = false;
 317
 318         Set<G2DSceneGraph> g2 = NodeUtil.collectNodes(ctx.getSceneGraph(), G2DSceneGraph.class);
 319         System.out.println("Total amount of nodes: " + g2.size() + 1);
 320
 321         Set<TextGridNode> grid = NodeUtil.collectNodes(ctx.getSceneGraph(), TextGridNode.class);
 322         Integer textGridNodeAmount = grid.size();
 323         System.out.println("Amount of TextGridNodes " + textGridNodeAmount);
 324
 325         Set<TextNode> texts = NodeUtil.collectNodes(ctx.getSceneGraph(), TextNode.class);
 326         Integer textNodeAmount = grid.size();
 327         System.out.println("Amount of TextNodes " + textNodeAmount);
 328
 329         for (TextNode node : texts) {
 330             if (module.equals(node.getText())) {
 331                 module_founded = true;
 332                 System.out.println("Correct module " + module + " founded.");
 333             }
 334             if (value.equals(node.getText())) {
 335                 value_founded = true;
 336                 System.out.println("Correct value " + value + " founded.");
 337             }
 338         }
 339
 340         if (value_founded == true && module_founded == true) {
 341                 return "Found both correct module " + module + " and value " + value;
 342         }
 343         if (value_founded == false && module_founded == true) {
 344                 return "Found only correct module " + module + " but not value " + value;
 345         }
 346         if (value_founded == true && module_founded == false) {
 347                 return "Found only correct value " + value + " but not module " + module;
 348         }
 349         else {
 350                 return "Didn't found either module " + module + " or value " + value;
 351         }
 352     }
 353
 354     public static boolean copyPaste (final ICanvasContext source_ctx, final ICanvasContext target_ctx, List<Resource> modules) throws DatabaseException {
 355
 356         IDiagram idiagram = source_ctx.getDefaultHintContext().getHint(DiagramHints.KEY_DIAGRAM);
 357
 358                 DataElementMap dem = idiagram.getDiagramClass().getAtMostOneItemOfClass(DataElementMap.class);
 359                 if (dem != null) {
 360                         final Collection<IElement> newSelection = new ArrayList<IElement>();
 361                         for (Resource module : modules) {
 362                                 IElement element = dem.getElement(idiagram, module);
 363                                 if (element != null) {
 364                                         newSelection.add(element);
 365                                 } else {
 366                                         throw new DatabaseException("Could not find IElement for " + element);
 367                                 }
 368                         }
 369
 370                         ThreadUtils.syncExec(source_ctx.getThreadAccess(), new Runnable() {
 371                     @Override
 372                     public void run() {
 373                         if (source_ctx.isDisposed())
 374                             return;
 375                         Selection selection = source_ctx.getAtMostOneItemOfClass(Selection.class);
 376                         if (selection != null) {
 377                             // This prevents workbench selection from being left over.
 378                             // Also prevents scene graph crap from being left on the screen.
 379                             selection.setSelection(0, newSelection);
 380                         }
 381                                 CanvasUtils.sendCommand(source_ctx, Commands.COPY);
 382                                 CanvasUtils.sendCommand(target_ctx, Commands.PASTE);
 383                     }
 384                 });
 385
 386                 //}
 387
 388                 while(source_ctx.getEventQueue().size() > 0) {
 389                         try {
 390                                 Thread.sleep(10);
 391                         } catch (InterruptedException e) {
 392                                 throw new DatabaseException(e);
 393                         }
 394                 }
 395
 396                 ThreadUtils.syncExec(source_ctx.getThreadAccess(), new Runnable() {
 397             @Override
 398             public void run() {
 399             }
 400         });
 401
 402                 }
 403                 return true;
 404     }
 405
 406
 407     static class UniqueIDGenerator extends SVGIDGenerator{
 408
 409         String overallId;
 410         public UniqueIDGenerator(String overallId) {
 411                 super();
 412                 this.overallId = overallId;
 413         }
 414
 415         @Override
 416         public String generateID(String prefix) {
 417                 return super.generateID(overallId+prefix);
 418         }
 419
 420     }
 421
 422         static class Generator extends SVGGraphics2D {
 423
 424                 int elemLevel = 0;
 425                 String newElementId = null;
 426                 ArrayList<Element> elements = new ArrayList<Element>();
 427
 428                 public static final String svgNS = "http://www.w3.org/2000/svg";
 429
 430                 public Generator(SVGGeneratorContext ctx, boolean textAsShapes) {
 431                         super(ctx, textAsShapes);
 432                 }
 433
 434                 public Generator(Document document) {
 435                         this(document,null);
 436                 }
 437                 public Generator(Document document, String id) {
 438                         super(document);
 439                         // prevent batik comment in each g-element
 440                         getGeneratorContext().setComment(null);
 441                         if (id != null)
 442                                 getGeneratorContext().setIDGenerator(new UniqueIDGenerator(id));
 443                 }
 444
 445                 @Override
 446                 public Element getRoot() {
 447                         Element root = super.getRoot();
 448                         for(Element e : elements) {
 449                                 root.appendChild(e);
 450                         }
 451                         return root;
 452                 }
 453
 454                 @Override
 455                 public void setRenderingHint(Key arg0, Object arg1) {
 456                         if(G2DRenderingHints.KEY_BEGIN_ELEMENT == arg0) {
 457                                 elemLevel++;
 458                         }
 459                         if(G2DRenderingHints.KEY_ELEMENT_ID == arg0) {
 460                                 if(arg1 != null)
 461                                         newElementId = arg1.toString();
 462                                 else
 463                                         newElementId = UUID.randomUUID().toString();
 464                         }
 465                         if(G2DRenderingHints.KEY_END_ELEMENT == arg0) {
 466                                 elemLevel--;
 467                                 if(elemLevel == 0) {
 468                                         Element group = getDOMFactory().createElement(SVG_G_TAG);
 469                                         //Element group = getDOMFactory().createElementNS(SVG_NAMESPACE_URI, SVG_G_TAG);
 470                                         group.setAttributeNS(null, "id", newElementId);
 471                                         group.setAttributeNS(null, "class", arg1.toString());
 472                                         getRoot(group);
 473                                         elements.add(group);
 474                                 }
 475                         }
 476                         super.setRenderingHint(arg0, arg1);
 477                 }
 478
 479         }
 480
 481         public static Element renderSVGNode(SVGGraphics2D svgGenerator, IG2DNode node) {
 482
 483                 try {
 484
 485                         svgGenerator.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
 486                         svgGenerator.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
 487                         svgGenerator.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
 488
 489                         node.render(svgGenerator);
 490
 491                 } catch (Throwable t) {
 492                         LOGGER.error("Problems rendering scene graph to SVG", t);
 493                 }
 494
 495                 return svgGenerator.getRoot();
 496         }
 497
 498         public static String printSVGDocument(Element doce) {
 499
 500                 StringBuilder result = new StringBuilder();
 501
 502                 NodeList nl =  doce.getChildNodes();
 503
 504                 for(int i=0;i<nl.getLength();i++) {
 505
 506                         ByteArrayOutputStream os = new ByteArrayOutputStream();
 507
 508                         try {
 509
 510                                 TransformerFactory tf = TransformerFactory.newInstance();
 511                                 Transformer transformer = tf.newTransformer();
 512                                 transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
 513                                 transformer.setOutputProperty(OutputKeys.STANDALONE, "no");
 514                                 transformer.setOutputProperty(OutputKeys.METHOD, "xml");
 515                                 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 516                                 transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
 517                                 transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
 518
 519                                 transformer.transform(new DOMSource(nl.item(i)),
 520                                                 new StreamResult(new OutputStreamWriter(os, "UTF-8")));
 521
 522                                 os.flush();
 523                                 os.close();
 524
 525                         } catch (Throwable t) {
 526                                 LOGGER.error("Problems formatting SVGDocument to text.", t);
 527                         }
 528
 529                         result.append(new String(os.toByteArray(), Charset.forName("UTF-8")));
 530
 531                 }
 532
 533                 return result.toString();
 534
 535         }
 536
 537         public static String renderSVG3(ICanvasContext ctx) {
 538                 return renderSVG3(ctx, -1, -1);
 539         }
 540
 541         public static String renderSVG3(ICanvasContext ctx, double width, double height) {
 542         return renderSVG0(width, height, SWT.LEFT, SWT.TOP, ctx, p0 -> p0.stream().collect(Collectors.toMap(p1 -> p1, p2 -> p2)));
 543         }
 544
 545     /**
 546      * @param graph
 547      * @param component
 548      * @throws DatabaseException
 549      */
 550     private static Object[] createURIBasedL0Identifier(ReadGraph graph, Resource component) throws DatabaseException {
 551         String uri = graph.getPossibleURI(component);
 552         int hashCode = uri.hashCode();
 553         Random random = new Random(hashCode);
 554         long l1 = random.nextLong();
 555         long l2 = random.nextLong();
 556         return new Object[] { l1, l2 };
 557     }
 558
 559     /**
 560      * Default no-op mapper
 561      */
 562     private static final Function1<Set<?>, Map<?, ?>> mapper = p0 -> p0.stream().collect(Collectors.toMap(p1 -> p1, p2 -> p2));
 563
 564
 565     /**
 566      * Renders CanvasContext to SVG.
 567      * @param ctx
 568      * @param width Width of output image. Use -1 for autosize.
 569      * @param height Height of output image. Use -1 for autosize.
 570      * @param ax horizontal alignment. SWT.LEFT SWT.CENTER SWT.RIGHT are accepted values. Value is not used with autosize.
 571      * @param ay vertical alignment. SWT.TOP SWT.CENTER SWT.BOTTOM are accepted values. Value is not used with autosize.
 572      * @return
 573      */
 574     public static String renderSVG(ICanvasContext ctx, double width, double height, int ax, int ay) {
 575         return renderSVG0(width, height, ax, ay, ctx, mapper);
 576     }
 577
 578     public static String renderSVG(ICanvasContext ctx, double width, double height) {
 579         return renderSVG(ctx,width,height, SWT.LEFT, SWT.TOP);
 580     }
 581
 582     public static String renderSVG(ICanvasContext ctx) {
 583         return renderSVG(ctx, -1, -1, SWT.LEFT, SWT.TOP);
 584     }
 585
 586     public static String renderSVGMapIdentifiers(ICanvasContext ctx) {
 587                 return renderSVGMapIdentifiers(ctx, -1, -1);
 588     }
 589
 590     /**
 591      * Renders ICanvasContext into SVG by mapping the SVG id's into URI based
 592      * GUID's
 593      *
 594      * @param ctx
 595      * @return
 596      */
 597     public static String renderSVGMapIdentifiers(ICanvasContext ctx, double width, double height) {
 598         return renderSVG0(width, height, SWT.LEFT, SWT.TOP, ctx, new Function1<Set<?>, Map<?, ?>>() {
 599
 600             @Override
 601             public Map<?, ?> apply(Set<?> p0) {
 602                 try {
 603                     return Simantics.getSession().syncRequest(new UnaryRead<Set<?>, Map<?, ?>>(p0) {
 604
 605                         @Override
 606                         public Map<?, ?> perform(ReadGraph graph) throws DatabaseException {
 607                             ModelingResources MOD = ModelingResources.getInstance(graph);
 608                             DiagramResource DIA = DiagramResource.getInstance(graph);
 609                             Layer0 L0 = Layer0.getInstance(graph);
 610                             return parameter.stream().collect(Collectors.toMap(p -> p, p -> {
 611                                 try {
 612                                     if (p instanceof Resource) {
 613                                         Resource element = (Resource) p;
 614                                         if (graph.isInstanceOf(element, DIA.Element)) {
 615                                             Resource component = graph.getPossibleObject(element, MOD.ElementToComponent);
 616                                             if (component != null) {
 617                                                 GUID identifier = graph.getPossibleRelatedValue(component, L0.identifier, GUID.BINDING);
 618                                                 if (identifier != null) {
 619                                                     return Arrays.toString(createURIBasedL0Identifier(graph, component));
 620                                                 } else {
 621                                                     LOGGER.error("Component {} does not have GUID identifier!", component);
 622                                                 }
 623                                             } else if (graph.isInstanceOf(element, DIA.Connection) || graph.isInstanceOf(element, DIA.Terminal)) {
 624                                                 // Ok, lets create a hashcode for connections and terminals as they do not have identifiers
 625                                                 return graph.getURI(element).hashCode();
 626                                             } else {
 627                                                 // Ok, lets create a hashcode or either return empty string in cases where no ID is required
 628                                                 if (graph.hasStatement(element, L0.HasName))
 629                                                     return graph.getURI(element).hashCode();
 630                                                 return "";
 631                                             }
 632                                         }
 633                                     } else {
 634                                         LOGGER.error("Parameter p {} is not resource but it is {}", p, p.getClass());
 635                                     }
 636                                     return p;
 637                                 } catch (DatabaseException e) {
 638                                     throw new RuntimeDatabaseException(e);
 639                                 }
 640                             }));
 641                         }
 642                     });
 643                 } catch (DatabaseException e) {
 644                     LOGGER.error("Could not apply mappings", e);
 645                     throw new RuntimeDatabaseException(e);
 646                 }
 647             }
 648         });
 649         }
 650
 651     static class RenderSVGContext {
 652
 653         Map<String,StringBuilder> documents = new HashMap<>();
 654
 655         public void append(String[] keys, String svgText) {
 656                 for(String key : keys) append(key, svgText);
 657         }
 658
 659         public void append(String key, String svgText) {
 660                 StringBuilder builder = documents.get(key);
 661                 if(builder == null) {
 662                         builder = new StringBuilder();
 663                         documents.put(key, builder);
 664                 }
 665                 builder.append(svgText);
 666         }
 667
 668         public void append(RenderSVGContext other) {
 669                 for(String key : other.documents.keySet()) {
 670                         append(key, other.get(key));
 671                 }
 672         }
 673
 674         public String get(String key) {
 675                 StringBuilder builder = documents.get(key);
 676                 if(builder == null) return "";
 677                 else return builder.toString();
 678         }
 679
 680     }
 681
 682
 683
 684         private static String renderSVG0(double width, double height, int ax, int ay, ICanvasContext ctx, Function1<Set<?>, Map<?, ?>> mappingFunction) {
 685
 686                 // Get a DOMImplementation.
 687                 DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();
 688
 689                 // Create an instance of org.w3c.dom.Document.
 690                 String svgNS = "http://www.w3.org/2000/svg";
 691                 Document document = domImpl.createDocument(svgNS, "svg", null);
 692
 693                 // Create an instance of the SVG Generator.
 694                 IDiagram d = ctx.getDefaultHintContext().getHint(DiagramHints.KEY_DIAGRAM);
 695                 Resource r = d.getHint(DiagramModelHints.KEY_DIAGRAM_RESOURCE);
 696                 SVGGraphics2D svgGenerator;
 697                 if (r != null)
 698                         svgGenerator = new Generator(document,r.toString());
 699                 else
 700                         svgGenerator = new Generator(document);
 701
 702                 RenderSVGContext result = new RenderSVGContext();
 703
 704                 double[] matrix = new double[6];
 705                 try {
 706
 707             Selection selection = ctx.getAtMostOneItemOfClass(Selection.class);
 708             if (selection != null) {
 709                 // This prevents workbench selection from being left over.
 710                 // Also prevents scene graph crap from being left on the screen.
 711                 selection.setSelection(0, d.getElements());
 712             }
 713
 714                         G2DSceneGraph sg = ctx.getSceneGraph();
 715                         sg.performCleanup();
 716                         G2DParentNode root = (G2DParentNode) sg.getRootNode();
 717
 718                         // rtree is the actual content of the diagram
 719                         RTreeNode rtree = NodeUtil.getNearestChildByClass(root, RTreeNode.class);
 720                         Rectangle2D rtreeBounds = NodeUtil.getLocalBounds(rtree);
 721
 722                         // get the bounds of the content
 723                         Rectangle2D content = rtreeBounds;
 724
 725 //                      int ax = SWT.LEFT;
 726 //                      int ay = SWT.TOP;
 727 //                      int ax = SWT.CENTER;
 728 //                      int ay = SWT.CENTER;
 729
 730                         if (content != null) {
 731                          // To account for dynamic padding of selection rectangles (5 units + stroke width)
 732                     int offset = 6;
 733
 734                     double scale = width < 0 || height < 0 ? 1.0 : Math.min((width - 2*offset) / content.getWidth(), (height - 2*offset) / content.getHeight());
 735
 736                     AffineTransform tr = new AffineTransform();
 737                     tr.translate(offset, offset);
 738                     tr.scale(scale, scale);
 739                     double dx = -content.getX();
 740                     double dy = -content.getY();
 741                     if (width > 0.0 && height > 0.0) {
 742                             if (ax == SWT.LEFT) {
 743                                 dx = -content.getX();
 744                             } else if (ax == SWT.RIGHT) {
 745                                 double t = ((width - 2*offset)/scale - content.getWidth());
 746                                 dx = -content.getX() + t;
 747                             } else {
 748                                 double t = ((width - 2*offset)/scale - content.getWidth()) *0.5;
 749                                 dx = -content.getX() + t;
 750                             }
 751                             if (ay == SWT.TOP) {
 752                                 dy = -content.getY();
 753                             } else if (ay == SWT.BOTTOM) {
 754                                 double t = ((height - 2*offset)/scale - content.getHeight());
 755                                 dy = -content.getY() + t;
 756                             } else {
 757                                 double t = ((height - 2*offset)/scale - content.getHeight()) * 0.5;
 758                                 dy = -content.getY() + t;
 759                             }
 760                     }
 761                             tr.translate(dx, dy);
 762                             tr.getMatrix(matrix);
 763                             svgGenerator.setSVGCanvasSize(new Dimension((int)Math.ceil(scale * content.getWidth()) + 2*offset, (int)Math.ceil(scale * content.getHeight()) + 2*offset));
 764                         } else {
 765                             svgGenerator.setSVGCanvasSize(new Dimension(100, 100));
 766                         }
 767                         //svgGenerator.translate(offset, offset);
 768                         //svgGenerator.scale(scale, scale);
 769                         // translate svgGenerator to the x and y coordinates of current content
 770                         //svgGenerator.translate(-content.getX(), -content.getY());
 771
 772
 773                         //svgGenerator.setClip(content);
 774
 775                         result.append(MAIN_SECTION, "<g class=\"symbols\">");
 776                         result.append(SELECTION_SECTION, "<g class=\"selections\">");
 777                         result.append(SELECTION_MASK_SECTION, "<g class=\"selectionMasks\">");
 778
 779                         KeyVisitor keyVisitor = new KeyVisitor();
 780                         sg.accept(keyVisitor);
 781
 782                         Set<Object> keys = keyVisitor.getKeys();
 783
 784                         Map<?, ?> mappings = mappingFunction.apply(keys);
 785
 786                         IG2DNodeVisitor visitor = new PrintingVisitor(svgGenerator, result, mappings);
 787
 788                         sg.accept(visitor);
 789
 790                 } catch (Throwable t) {
 791                         LOGGER.error("Problems rendering canvas context to SVG", t);
 792                 }
 793
 794
 795                 result.append(ALL_SECTIONS, "</g>");
 796
 797                 StringBuilder res = new StringBuilder();
 798                 if (width > 0 && height > 0 ) {
 799                         res.append("<svg width=\"" + width +"px\" height=\""+height+"px\" stroke=\"black\" xmlns=\"http://www.w3.org/2000/svg\">");
 800                 } else {
 801                         res.append("<svg width=\"100%\" height=\"100%\" stroke=\"black\" xmlns=\"http://www.w3.org/2000/svg\">");
 802                 }
 803                 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(")\">");
 804                 res.append(result.get(MAIN_SECTION));
 805                 res.append(result.get(SELECTION_SECTION));
 806                 res.append(result.get(SELECTION_MASK_SECTION));
 807                 res.append("</g>");
 808                 res.append("</svg>");
 809
 810 //              System.err.println(" == FINAL RESULT == ");
 811 //              System.err.println(res.toString());
 812
 813                 return res.toString();
 814
 815         }
 816
 817
 818
 819         private static class KeyVisitor implements IG2DNodeVisitor {
 820
 821         private Set<Object> keys = new HashSet<>();
 822
 823         @Override
 824         public void enter(IG2DNode node) {
 825             if (node instanceof SingleElementNode) {
 826                 Object key = ((SingleElementNode) node).getKey();
 827                 if (key != null) {
 828                     keys.add(key);
 829                 }
 830             }
 831         }
 832
 833         @Override
 834         public void leave(IG2DNode node) {
 835             // Nothing to do
 836         }
 837
 838         public Set<Object> getKeys() {
 839             return keys;
 840         }
 841         }
 842
 843         private static class PrintingVisitor implements IG2DNodeVisitor {
 844
 845         int indent = 0;
 846
 847         HashMap<SingleElementNode,RenderSVGContext> senBuilders = new HashMap<>();
 848
 849         private RenderSVGContext result;
 850         private SVGGraphics2D svgGenerator;
 851
 852         private Map<?, ?> mappings;
 853
 854         public PrintingVisitor(SVGGraphics2D svgGenerator, RenderSVGContext result, Map<?, ?> mappings) {
 855             this.result = result;
 856             this.mappings = mappings;
 857             this.svgGenerator = svgGenerator;
 858         }
 859
 860         private String getKey(SingleElementNode node) {
 861             String key;
 862                 if(node.getKey() != null) {
 863                 if (mappings.containsKey(node.getKey())) {
 864                     key = mappings.get(node.getKey()).toString();
 865                     key = escape(key);
 866                 } else {
 867                     key = node.getKey().toString();
 868                     key = escape(key);
 869                 }
 870                 } else {
 871                         key = Long.toString(node.getId());
 872                 }
 873             return key;
 874         }
 875
 876         private String escape(String key) {
 877                 // Keys may contain  '<' '>' characters, which causes errors in browser SVG handling.
 878                 return org.apache.commons.lang.StringEscapeUtils.escapeHtml(key);
 879         }
 880
 881         private String removeElem(String xml, String elemStart) {
 882                 // FIXME: This is rather nasty and error prone way of removing elements from XML string.
 883                 // This only supports elements with /> end element tag. Elements ends with </elem name> are not supported!
 884                 int start = xml.indexOf("<"+elemStart);
 885                 if (start>=0) {
 886                         int end = xml.indexOf(">",start);
 887                         if (end >= 0) {
 888                                 if (start > 0)
 889                                         return xml.substring(0,start)+xml.substring(end+1);
 890                                 else
 891                                         return xml.substring(end+1);
 892                         }
 893                 }
 894                 return null;
 895         }
 896
 897         @Override
 898         public void enter(IG2DNode node) {
 899
 900                 RenderSVGContext parentBuilder = getParentBuilder(node);
 901
 902             indent++;
 903             if(node instanceof ConnectionNode) {
 904
 905                 for(RouteGraphNode n : NodeUtil.collectNodes(node, RouteGraphNode.class)) {
 906                     n.setIgnoreSelection(true);
 907                 }
 908
 909                 String key = getKey((ConnectionNode) node);
 910                 parentBuilder.append(MAIN_SECTION, "\n<g class=\"connection\" id=\"" + key + "\">");
 911                 parentBuilder.append(SELECTION_SECTION, "\n<g style=\"visibility:hidden\" class=\"selection\" id=\"" + key + "\">");
 912                 parentBuilder.append(SELECTION_MASK_SECTION, "\n<g class=\"selectionMask\" opacity=\"" + OPACITY + "\" id=\"" + key + "\">");
 913
 914                 Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 915                 String svg = printSVGDocument(doc);
 916                 parentBuilder.append(MAIN_SECTION, svg);
 917
 918                 for(RouteGraphNode n : NodeUtil.collectNodes(node, RouteGraphNode.class)) {
 919                     n.setIgnoreSelection(false);
 920                 }
 921
 922                 doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 923                 svg = printSVGDocument(doc);
 924                 parentBuilder.append(SELECTION_SECTION, svg);
 925
 926                 BasicStroke bs = new BasicStroke(10f);
 927
 928                 for(RouteGraphNode n : NodeUtil.collectNodes(node, RouteGraphNode.class)) {
 929                     n.setDynamicStroke(bs);
 930                 }
 931
 932                 doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 933                 svg = printSVGDocument(doc);
 934                 parentBuilder.append(SELECTION_MASK_SECTION, svg);
 935
 936                 senBuilders.put((ConnectionNode)node, new RenderSVGContext());
 937
 938
 939             } else if (isSelection0(node)) {
 940
 941                 SelectionNode n = (SelectionNode)node;
 942                 SingleElementNode parentSEN = (SingleElementNode)NodeUtil.getNearestParentOfType(node, SingleElementNode.class);
 943                 if(parentSEN != null) {
 944
 945                         RenderSVGContext parentBuilder2 = getParentBuilder(parentSEN);
 946
 947                     String key = getKey(parentSEN);
 948                     n.setIgnore(false);
 949                     Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 950                     n.setIgnore(true);
 951                     String svg = printSVGDocument(doc);
 952                     parentBuilder2.append(SELECTION_SECTION, "\n<g style=\"visibility:hidden\" class=\"selection\" id=\"" + key + "\">");
 953                     parentBuilder2.append(SELECTION_SECTION, svg);
 954                     parentBuilder2.append(SELECTION_SECTION, "\n</g>");
 955                     parentBuilder2.append(SELECTION_MASK_SECTION, "\n<g class=\"selectionMask\" id=\"" + key /*+ "\" transform=\"" + matrixString + "\"*/+ "\">");
 956                     Rectangle2D rect = n.getRect();
 957                     // NaN
 958                     if(rect.getHeight() == rect.getHeight() && rect.getWidth() == rect.getWidth()) {
 959                             parentBuilder2.append(SELECTION_MASK_SECTION,"<rect style=\"fill:#fff\" opacity=\"" + OPACITY + "\"");
 960                             parentBuilder2.append(SELECTION_MASK_SECTION," x=\"" + rect.getX() + "\" y=\"" + rect.getY() + "\"");
 961                             parentBuilder2.append(SELECTION_MASK_SECTION," width=\"" + rect.getWidth() + "\" height=\"" + rect.getHeight() + "\"");
 962                             parentBuilder2.append(SELECTION_MASK_SECTION,"></rect>");
 963                     }
 964                     parentBuilder2.append(SELECTION_MASK_SECTION,"\n</g>");
 965
 966                 }
 967             } else if (node instanceof SelectionNode) {
 968
 969                 Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
 970                 String svg = printSVGDocument(doc);
 971                 parentBuilder.append(MAIN_SECTION, "<g>");
 972                 parentBuilder.append(MAIN_SECTION, svg);
 973                 parentBuilder.append(MAIN_SECTION, "\n</g>");
 974
 975             } else if (node instanceof SVGNode) {
 976                 SVGNode svg = (SVGNode)node;
 977                 AffineTransform at = svg.getTransform();
 978                 if (!at.isIdentity()) {
 979                          if(at.getScaleX() == 1.0 && at.getScaleY() == 1.0 && at.getShearX() == 0.0 && at.getShearY() == 0.0) {
 980                          String m = "translate(" + at.getTranslateX() + " " + at.getTranslateY() + ")";
 981                          parentBuilder.append(MAIN_SECTION, "\n<g transform=\"" + m + "\">");
 982                      } else {
 983                          double[] ds = new double[6];
 984                          at.getMatrix(ds);
 985                          String m = "matrix(" + ds[0] + " " + ds[1] + " " + ds[2] + " " + ds[3] + " " + ds[4] + " " + ds[5] + ")";
 986                          parentBuilder.append(MAIN_SECTION, "\n<g transform=\"" + m + "\">");
 987                      }
 988                 }
 989                 String svgContent = svg.getSVGText();
 990                 // SVGNode content may contain SVG/XML elements, which break browser compatibility
 991                 int start = svgContent.indexOf("<svg");
 992                 if (start >= 0)
 993                         svgContent = svgContent.substring(start);
 994                 else  {
 995                         String s = removeElem(svgContent, "?xml");
 996                         if (s != null) {
 997                                 svgContent = "<g>"+s+"</g>";
 998                                 s = removeElem(svgContent, "!DOCTYPE");
 999                                 if (s != null)
1000                                         svgContent = s;
1001                         }
1002                 }
1003                 parentBuilder.append(MAIN_SECTION, svgContent);
1004                 if (!at.isIdentity()) {
1005                         parentBuilder.append(MAIN_SECTION, "\n</g>");
1006                 }
1007             } else if (node instanceof G2DParentNode) {
1008                 AffineTransform at = node.getTransform();
1009                 if(node instanceof SingleElementNode) {
1010                     SingleElementNode sen = (SingleElementNode)node;
1011                     String key = getKey(sen);
1012                     String typeClass = sen.getTypeClass();
1013                     String clazz = "definedElement";
1014                     if(typeClass != null && !typeClass.isEmpty())
1015                         clazz = clazz + " " + typeClass;
1016
1017                     parentBuilder.append(MAIN_SECTION, "\n<g class=\""+clazz+"\" id=\"" + key + "\">");
1018                     senBuilders.put(sen, new RenderSVGContext());
1019                 }
1020                 if(!at.isIdentity()) {
1021                     if(at.getScaleX() == 1.0 && at.getScaleY() == 1.0 && at.getShearX() == 0.0 && at.getShearY() == 0.0) {
1022                         String m = "translate(" + at.getTranslateX() + " " + at.getTranslateY() + ")";
1023                         parentBuilder.append(ALL_SECTIONS, "\n<g transform=\"" + m + "\">");
1024                     } else {
1025                         double[] ds = new double[6];
1026                         at.getMatrix(ds);
1027                         String m = "matrix(" + ds[0] + " " + ds[1] + " " + ds[2] + " " + ds[3] + " " + ds[4] + " " + ds[5] + ")";
1028                         parentBuilder.append(ALL_SECTIONS, "\n<g transform=\"" + m + "\">");
1029                     }
1030                 }
1031             } else if (node instanceof TextNode) {
1032                  TextNode text = (TextNode)node;
1033
1034                  SingleElementNode parentSEN = (SingleElementNode)NodeUtil.getNearestParentOfType(node, SingleElementNode.class);
1035                  if(parentSEN != null) {
1036
1037                          text.setShowSelection(false);
1038                          Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
1039                      String svg = printSVGDocument(doc);
1040                      parentBuilder.append(MAIN_SECTION, svg);
1041
1042                          RenderSVGContext parentBuilder2 = getParentBuilder(parentSEN);
1043
1044                      String key = getKey(parentSEN);
1045                      text.setShowSelection(true);
1046                      doc = renderSVGNode(svgGenerator, (IG2DNode)node);
1047                      svg = printSVGDocument(doc);
1048
1049                      parentBuilder2.append(SELECTION_SECTION, "\n<g style=\"visibility:hidden\" class=\"selection\" id=\"" + key + "\">");
1050                      parentBuilder2.append(SELECTION_SECTION, svg);
1051                      parentBuilder2.append(SELECTION_SECTION, "\n</g>");
1052                      parentBuilder2.append(SELECTION_MASK_SECTION, "\n<g class=\"selectionMask\" id=\"" + key /*+ "\" transform=\"" + matrixString + "\"*/+ "\">");
1053                      Rectangle2D rect = text.getBounds();
1054                      // NaN
1055                      if(rect.getHeight() == rect.getHeight() && rect.getWidth() == rect.getWidth()) {
1056                             parentBuilder2.append(SELECTION_MASK_SECTION,"<rect style=\"fill:#fff\" opacity=\"" + OPACITY + "\"");
1057                             parentBuilder2.append(SELECTION_MASK_SECTION," x=\"" + rect.getX() + "\" y=\"" + rect.getY() + "\"");
1058                             parentBuilder2.append(SELECTION_MASK_SECTION," width=\"" + rect.getWidth() + "\" height=\"" + rect.getHeight() + "\"");
1059                             parentBuilder2.append(SELECTION_MASK_SECTION,"></rect>");
1060                      }
1061                      parentBuilder2.append(SELECTION_MASK_SECTION,"\n</g>");
1062
1063                  }
1064             } else if (!(node instanceof RouteGraphNode) && !(node instanceof LinkNode)){
1065                 try {
1066                         Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
1067                         NodeList gList = doc.getElementsByTagName("g");
1068                         if (gList.getLength() == 0)
1069                                 return;
1070                         boolean hasContent = false;
1071                         for (int i = 0; i < gList.getLength(); i++) {
1072                             Node gNode = gList.item(i);
1073                             if (gNode.hasChildNodes()) {
1074                                 hasContent = true;
1075                                 break;
1076                             }
1077                         }
1078                         if (!hasContent)
1079                             return;
1080                         String svg = printSVGDocument(doc);
1081                         if (node instanceof SelectionShapeNode) {
1082                                 SingleElementNode parentSEN = (SingleElementNode)NodeUtil.getNearestParentOfType(node, SingleElementNode.class);
1083                         if(parentSEN != null) {
1084                                  String key = getKey(parentSEN);
1085                                  RenderSVGContext parentBuilder2 = getParentBuilder(parentSEN);
1086                                  parentBuilder2.append(SELECTION_SECTION, "\n<g style=\"visibility:hidden\" class=\"selection\" id=\"" + key + "\">");
1087                              parentBuilder2.append(SELECTION_SECTION, svg);
1088                              parentBuilder2.append(SELECTION_SECTION, "\n</g>");
1089
1090                              parentBuilder2.append(SELECTION_MASK_SECTION, "\n<g class=\"selectionMask\" id=\"" + key /*+ "\" transform=\"" + matrixString + "\"*/+ "\">");
1091                              Rectangle2D rect = node.getBounds();
1092                              // NaN
1093                              if(rect.getHeight() == rect.getHeight() && rect.getWidth() == rect.getWidth()) {
1094                                     parentBuilder2.append(SELECTION_MASK_SECTION,"<rect style=\"fill:#fff\" opacity=\"" + OPACITY + "\"");
1095                                     parentBuilder2.append(SELECTION_MASK_SECTION," x=\"" + rect.getX() + "\" y=\"" + rect.getY() + "\"");
1096                                     parentBuilder2.append(SELECTION_MASK_SECTION," width=\"" + rect.getWidth() + "\" height=\"" + rect.getHeight() + "\"");
1097                                     parentBuilder2.append(SELECTION_MASK_SECTION,"></rect>");
1098                              }
1099                              parentBuilder2.append(SELECTION_MASK_SECTION,"\n</g>");
1100                         }
1101                         } else {
1102                                 parentBuilder.append(MAIN_SECTION, "<g class=\"" +node.getSimpleClassName() +"\">");
1103                                 parentBuilder.append(MAIN_SECTION, svg);
1104                                 parentBuilder.append(MAIN_SECTION, "\n</g>");
1105                         }
1106                 } catch (Exception e) {
1107                         // TODO: There are nodes that do not behave well when rendered to SVG. For backwards compatibility, we don't handle the exceptions.
1108                 }
1109             }
1110
1111             //enters.put(node, b.length());
1112
1113         }
1114
1115         private boolean isSelection0(IG2DNode node) {
1116
1117             if(node instanceof SelectionNode) {
1118                 SelectionNode sn = (SelectionNode)node;
1119                 return sn.getSelectionId() == 0;
1120             } else {
1121                 return false;
1122             }
1123
1124         }
1125
1126         private RenderSVGContext getParentBuilder(IG2DNode node) {
1127
1128             INode parentSEN = NodeUtil.getNearestParentOfType(node, SingleElementNode.class);
1129             if(parentSEN instanceof G2DSceneGraph) return result;
1130
1131             RenderSVGContext parentBuilder = senBuilders.get(parentSEN);
1132             if(parentBuilder == null) return result;
1133
1134             return parentBuilder;
1135
1136         }
1137
1138         @Override
1139         public void leave(IG2DNode node) {
1140
1141             if( node instanceof SVGNode) {
1142                 // We are done
1143             } else if (node instanceof ConnectionNode) {
1144                 RenderSVGContext parentBuilder = getParentBuilder(node);
1145                 SingleElementNode sen = (SingleElementNode)node;
1146                 RenderSVGContext b = senBuilders.get(sen);
1147                 String content = b.get(MAIN_SECTION);
1148                 if(content.isEmpty()) {
1149 //                      Handling connection the same way as SingleElementNode would draw connection twice..
1150 //                      if(sen.getKey() != null) {
1151 //
1152 //                              for(SelectionNode n : NodeUtil.collectNodes(node, SelectionNode.class)) {
1153 //                                      n.setIgnore(true);
1154 //                              }
1155 //
1156 //                              Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
1157 //                              String svg = printSVGDocument(doc);
1158 //                              parentBuilder.append(MAIN_SECTION, svg);
1159 //                      }
1160                 } else {
1161                         parentBuilder.append(b);
1162                 }
1163                 parentBuilder.append(SELECTION_MASK_SECTION, "\n</g>");
1164                 parentBuilder.append(SELECTION_SECTION, "\n</g>");
1165                 parentBuilder.append(MAIN_SECTION, "\n</g>");
1166
1167             } else if (node instanceof G2DParentNode) {
1168
1169                 RenderSVGContext parentBuilder = getParentBuilder(node);
1170
1171                 if(node instanceof SingleElementNode) {
1172                         SingleElementNode sen = (SingleElementNode)node;
1173                         RenderSVGContext b = senBuilders.get(sen);
1174                         String content = b.get(MAIN_SECTION);
1175                         if(content.isEmpty()) {
1176                                 if(sen.getKey() != null) {
1177
1178                                         for(SelectionNode n : NodeUtil.collectNodes(node, SelectionNode.class)) {
1179                                                 n.setIgnore(true);
1180                                         }
1181
1182                                         Element doc = renderSVGNode(svgGenerator, (IG2DNode)node);
1183                                         String svg = printSVGDocument(doc);
1184                                         parentBuilder.append(MAIN_SECTION, svg);
1185                                 }
1186                         } else {
1187                                 parentBuilder.append(b);
1188                         }
1189                 }
1190
1191                 AffineTransform at = node.getTransform();
1192                 if(!at.isIdentity()) {
1193                     parentBuilder.append(ALL_SECTIONS, "</g>");
1194                 }
1195                 if(node instanceof SingleElementNode) {
1196                     SingleElementNode sen = (SingleElementNode)node;
1197                     //if(sen.getKey() != null) {
1198                         parentBuilder.append(MAIN_SECTION, "</g>");
1199                     //}
1200                 }
1201             }
1202             indent --;
1203         }
1204         }
1205 }