bundles/org.simantics.g2d/src/org/simantics/g2d/diagram/participant/ElementPainter.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2018 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *     Semantum Oy - GitLab issue #66
  12  *******************************************************************************/
  13 package org.simantics.g2d.diagram.participant;
  14
  15 import java.awt.BasicStroke;
  16 import java.awt.Color;
  17 import java.awt.Composite;
  18 import java.awt.Shape;
  19 import java.awt.geom.AffineTransform;
  20 import java.awt.geom.Point2D;
  21 import java.awt.geom.Rectangle2D;
  22 import java.nio.CharBuffer;
  23 import java.util.ArrayList;
  24 import java.util.Collection;
  25 import java.util.Collections;
  26 import java.util.HashMap;
  27 import java.util.HashSet;
  28 import java.util.Iterator;
  29 import java.util.List;
  30 import java.util.Map;
  31 import java.util.Random;
  32 import java.util.Set;
  33 import java.util.UUID;
  34 import java.util.concurrent.ConcurrentHashMap;
  35 import java.util.concurrent.ConcurrentMap;
  36 import java.util.function.Consumer;
  37
  38 import org.simantics.g2d.canvas.Hints;
  39 import org.simantics.g2d.canvas.ICanvasContext;
  40 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;
  41 import org.simantics.g2d.canvas.impl.DependencyReflection.Reference;
  42 import org.simantics.g2d.canvas.impl.HintReflection.HintListener;
  43 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGCleanup;
  44 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;
  45 import org.simantics.g2d.connection.handler.ConnectionHandler;
  46 import org.simantics.g2d.diagram.DiagramHints;
  47 import org.simantics.g2d.diagram.DiagramUtils;
  48 import org.simantics.g2d.diagram.IDiagram;
  49 import org.simantics.g2d.diagram.IDiagram.CompositionListener;
  50 import org.simantics.g2d.diagram.handler.RelationshipHandler;
  51 import org.simantics.g2d.diagram.handler.RelationshipHandler.Relation;
  52 import org.simantics.g2d.diagram.handler.TransactionContext;
  53 import org.simantics.g2d.diagram.handler.TransactionContext.Transaction;
  54 import org.simantics.g2d.diagram.handler.TransactionContext.TransactionListener;
  55 import org.simantics.g2d.element.ElementClass;
  56 import org.simantics.g2d.element.ElementHints;
  57 import org.simantics.g2d.element.ElementUtils;
  58 import org.simantics.g2d.element.IElement;
  59 import org.simantics.g2d.element.SceneGraphNodeKey;
  60 import org.simantics.g2d.element.handler.BendsHandler;
  61 import org.simantics.g2d.element.handler.Children;
  62 import org.simantics.g2d.element.handler.Children.ChildEvent;
  63 import org.simantics.g2d.element.handler.Children.ChildListener;
  64 import org.simantics.g2d.element.handler.FillColor;
  65 import org.simantics.g2d.element.handler.Outline;
  66 import org.simantics.g2d.element.handler.OutlineColorSpec;
  67 import org.simantics.g2d.element.handler.Parent;
  68 import org.simantics.g2d.element.handler.SceneGraph;
  69 import org.simantics.g2d.element.handler.SelectionOutline;
  70 import org.simantics.g2d.element.handler.SelectionSpecification;
  71 import org.simantics.g2d.element.handler.StrokeSpec;
  72 import org.simantics.g2d.element.handler.TerminalTopology;
  73 import org.simantics.g2d.element.handler.Transform;
  74 import org.simantics.g2d.layers.ILayer;
  75 import org.simantics.g2d.layers.ILayersEditor;
  76 import org.simantics.g2d.layers.ILayersEditor.ILayersEditorListener;
  77 import org.simantics.g2d.participant.TransformUtil;
  78 import org.simantics.g2d.scenegraph.SceneGraphConstants;
  79 import org.simantics.g2d.utils.ElementNodeBridge;
  80 import org.simantics.g2d.utils.TopologicalSelectionExpander;
  81 import org.simantics.scenegraph.INode;
  82 import org.simantics.scenegraph.Node;
  83 import org.simantics.scenegraph.g2d.G2DParentNode;
  84 import org.simantics.scenegraph.g2d.G2DSceneGraph;
  85 import org.simantics.scenegraph.g2d.IG2DNode;
  86 import org.simantics.scenegraph.g2d.nodes.ConnectionNode;
  87 import org.simantics.scenegraph.g2d.nodes.DataNode;
  88 import org.simantics.scenegraph.g2d.nodes.LinkNode;
  89 import org.simantics.scenegraph.g2d.nodes.SelectionNode;
  90 import org.simantics.scenegraph.g2d.nodes.ShapeNode;
  91 import org.simantics.scenegraph.g2d.nodes.SingleElementNode;
  92 import org.simantics.scenegraph.g2d.nodes.UnboundedNode;
  93 import org.simantics.scenegraph.g2d.nodes.spatial.RTreeNode;
  94 import org.simantics.scenegraph.utils.ColorUtil;
  95 import org.simantics.scenegraph.utils.GeometryUtils;
  96 import org.simantics.scenegraph.utils.NodeUtil;
  97 import org.simantics.utils.datastructures.collections.CollectionUtils;
  98 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
  99 import org.simantics.utils.datastructures.hints.IHintContext.Key;
 100 import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
 101 import org.simantics.utils.datastructures.hints.IHintListener;
 102 import org.simantics.utils.datastructures.hints.IHintObservable;
 103
 104 /**
 105  * A diagram participant that keeps a diagram and its elements synchronized with
 106  * the active canvas scene graph.
 107  *
 108  * <p>
 109  * Responsibilities include:
 110  * <ul>
 111  * <li>ensure that the scene graph contains a {@link SingleElementNode} instance
 112  * for each diagram element</li>
 113  * <li>ensure that the scene graph node order matches the diagram element order</li>
 114  * <li>ensure that the scene graph contains a {@link SelectionNode} under the
 115  * element instance nodes for each selected node. TODO: maybe try getting
 116  * selection out of here into a different participant, but without cloning the
 117  * entire listening/element<->scene graph updating infrastructure.</li>
 118  * <li></li>
 119  * </ul>
 120  *
 121  * @author Tuukka Lehtonen
 122  *
 123  * @see ElementNodeBridge
 124  */
 125 public class ElementPainter extends AbstractDiagramParticipant implements CompositionListener, TransactionListener, ChildListener {
 126
 127     public static final Key      KEY_SELECTION_PROVIDER = new KeyOf(ISelectionProvider.class);
 128
 129     public static final int SELECTION_PAINT_PRIORITY    = 100;
 130
 131     public static final Key KEY_SELECTION_FRAME_COLOR   = new KeyOf(Color.class, "SELECTION_FRAME_COLOR");
 132     public static final Key KEY_SELECTION_CONTENT_COLOR = new KeyOf(Color.class, "SELECTION_CONTENT_COLOR");
 133
 134
 135     /**
 136      * Implement to customize the way a selection is visualized by
 137      * ElementPainter.
 138      */
 139     public static interface ISelectionProvider {
 140         public void init(int selectionId, final IElement e, final G2DParentNode parentNode, final String nodeId,
 141                 final AffineTransform transform, final Rectangle2D bounds, final Color color);
 142     }
 143
 144     private static final boolean DEBUG                  = false;
 145     private static final boolean NODE_TO_ELEMENT_MAPPING = true;
 146
 147     public static final int      ELEMENT_PAINT_PRIORITY = 10;
 148
 149     @Reference
 150     ZOrderHandler zOrderHandler;
 151
 152     @Dependency
 153     TransformUtil util;
 154
 155     @Dependency
 156     Selection selection;
 157
 158     SingleElementNode diagramParent;
 159     RTreeNode elementParent;
 160
 161     boolean paintSelectionFrames;
 162
 163     /**
 164      * Internally reused to avert constant reallocation.
 165      */
 166     private transient List<Relation> relations = new ArrayList<Relation>(4);
 167     /**
 168      * Internally reused to avert constant reallocation.
 169      */
 170     private transient Set<IElement> relatedElements = new HashSet<IElement>(8);
 171
 172     public ElementPainter() {
 173         this(true);
 174     }
 175
 176     public ElementPainter(boolean paintSelectionFrames) {
 177         this.paintSelectionFrames = paintSelectionFrames;
 178     }
 179
 180     @Override
 181     public void addedToContext(ICanvasContext ctx) {
 182         super.addedToContext(ctx);
 183         if (zOrderHandler != null) {
 184             zOrderHandler.addOrderListener(zOrderListener);
 185         }
 186     }
 187
 188     @Override
 189     public void removedFromContext(ICanvasContext ctx) {
 190         if (zOrderHandler != null) {
 191             zOrderHandler.removeOrderListener(zOrderListener);
 192         }
 193         selections.clear();
 194         super.removedFromContext(ctx);
 195     }
 196
 197     @Override
 198     protected void onDiagramSet(IDiagram newValue, IDiagram oldValue) {
 199         if (oldValue == newValue)
 200             return;
 201
 202         if (oldValue != null) {
 203             Map<INode, IElement> nodeToElementMap = oldValue.removeHint(DiagramHints.NODE_TO_ELEMENT_MAP);
 204             for (IElement e : oldValue.getElements()) {
 205                 removeElement(oldValue, e, nodeToElementMap);
 206             }
 207
 208             oldValue.removeCompositionListener(this);
 209             oldValue.removeKeyHintListener(Hints.KEY_DIRTY, diagramHintListener);
 210             oldValue.removeKeyHintListener(Hints.KEY_DISABLE_PAINTING, diagramHintListener);
 211
 212             ILayersEditor layers = oldValue.getHint(DiagramHints.KEY_LAYERS_EDITOR);
 213             if (layers != null) {
 214                 layers.removeListener(layersListener);
 215             }
 216
 217             for (TransactionContext tc : oldValue.getDiagramClass().getItemsByClass(TransactionContext.class)) {
 218                 tc.removeTransactionListener(oldValue, this);
 219             }
 220         }
 221
 222         if (newValue != null) {
 223             diagram.removeHint(DiagramHints.NODE_TO_ELEMENT_MAP);
 224             Map<INode, IElement> nodeElementMap = NODE_TO_ELEMENT_MAPPING ? new HashMap<>() : null;
 225             if (nodeElementMap != null)
 226                 diagram.setHint(DiagramHints.NODE_TO_ELEMENT_MAP, nodeElementMap);
 227
 228             for (IElement e : newValue.getElements()) {
 229                 addElement(newValue, e, false, nodeElementMap);
 230             }
 231
 232             newValue.addCompositionListener(this);
 233             newValue.addKeyHintListener(Hints.KEY_DISABLE_PAINTING, diagramHintListener);
 234             newValue.addKeyHintListener(Hints.KEY_DIRTY, diagramHintListener);
 235
 236             ILayersEditor layers = newValue.getHint(DiagramHints.KEY_LAYERS_EDITOR);
 237             if (layers != null) {
 238                 layers.addListener(layersListener);
 239             }
 240
 241             for (TransactionContext tc : newValue.getDiagramClass().getItemsByClass(TransactionContext.class)) {
 242                 tc.addTransactionListener(newValue, this);
 243             }
 244         }
 245
 246         updateAll();
 247     }
 248
 249     @SGInit
 250     public void initSG(G2DParentNode parent) {
 251         diagramParent = parent.addNode("elements_"+Node.IDCOUNTER, UnboundedNode.class);
 252         diagramParent.setZIndex(ELEMENT_PAINT_PRIORITY);
 253         elementParent = diagramParent.addNode(SceneGraphConstants.SPATIAL_ROOT_NODE_NAME, RTreeNode.class);
 254         elementParent.setLookupId(SceneGraphConstants.SPATIAL_ROOT_NODE_ID);
 255         elementParent.setZIndex(0);
 256     }
 257
 258     @SGCleanup
 259     public void cleanupSG() {
 260         diagramParent.remove();
 261         elementParent = null;
 262         diagramParent = null;
 263     }
 264
 265     public INode getDiagramElementParentNode() {
 266         return elementParent;
 267     }
 268
 269     // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 270     // Element z-order listening and update logic
 271     // ------------------------------------------------------------------------
 272
 273     ZOrderListener zOrderListener = new ZOrderListener() {
 274         @Override
 275         public void orderChanged(IDiagram diagram) {
 276             if (diagram == ElementPainter.this.diagram) {
 277                 updateZOrder(diagram, ElementHints.KEY_SG_NODE);
 278             }
 279         }
 280     };
 281
 282     protected static void updateZOrder(IDiagram diagram, Key elementSgNodeKey) {
 283         int zIndex = 0;
 284         for (IElement e : diagram.getElements()) {
 285             Node node = e.getHint(elementSgNodeKey);
 286             if (node instanceof IG2DNode) {
 287                 ((IG2DNode) node).setZIndex(++zIndex);
 288             }
 289         }
 290     }
 291
 292     // ------------------------------------------------------------------------
 293     // Element z-order listening and update logic end
 294     // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 295
 296
 297     // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 298     // Layer configuration change listening and reaction logic
 299     // ------------------------------------------------------------------------
 300
 301     ILayersEditorListener layersListener = new ILayersEditorListener() {
 302         private void layersChanged() {
 303             Object task = BEGIN("EP.layersChanged");
 304             // Update visibility/focusability for each node only, do not reinitialize the graphics.
 305             updateAllVisibility();
 306             END(task);
 307         }
 308         @Override
 309         public void layerRemoved(ILayer layer) {
 310             layersChanged();
 311         }
 312         @Override
 313         public void layerDeactivated(ILayer layer) {
 314             layersChanged();
 315         }
 316         @Override
 317         public void layerAdded(ILayer layer) {
 318             layersChanged();
 319         }
 320         @Override
 321         public void layerActivated(ILayer layer) {
 322             layersChanged();
 323         }
 324         @Override
 325         public void ignoreFocusChanged(boolean value) {
 326                 ICanvasContext ctx = getContext();
 327                 if(ctx == null) return;
 328                 G2DSceneGraph sg = ctx.getSceneGraph();
 329                 if(sg == null) return;
 330                 sg.setGlobalProperty(G2DSceneGraph.IGNORE_FOCUS, value);
 331         }
 332         @Override
 333         public void ignoreVisibilityChanged(boolean value) {
 334             layersChanged();
 335         }
 336     };
 337
 338     protected void updateAllVisibility() {
 339         // TODO: optimize, no node reinitialization
 340         updateAll();
 341     }
 342
 343     // ------------------------------------------------------------------------
 344     // Layer configuration change listening and reaction logic
 345     // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 346
 347
 348     // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 349     // Diagram/Element hint listeners
 350     // ------------------------------------------------------------------------
 351
 352     class DiagramHintListener extends HintListenerAdapter {
 353         @Override
 354         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
 355             if (key == Hints.KEY_DISABLE_PAINTING) {
 356                 if (diagramParent != null) {
 357                     diagramParent.setVisible(!Boolean.TRUE.equals(newValue));
 358                 }
 359             } else if (key == Hints.KEY_DIRTY) {
 360                 if (newValue == Hints.VALUE_Z_ORDER_CHANGED) {
 361                     diagram.removeHint(Hints.KEY_DIRTY);
 362
 363                     if (DEBUG)
 364                         System.out.println("Diagram z-order changed: " + diagram);
 365
 366                     updateZOrder(diagram, ElementHints.KEY_SG_NODE);
 367                 }
 368             }
 369         }
 370     };
 371
 372     private final DiagramHintListener diagramHintListener = new DiagramHintListener();
 373
 374     /**
 375      * This element hint listener tries to ensure that diagram elements and the
 376      * normal diagram scene graph stay in sync by listening to any changes
 377      * occurring in elements, i.e. in their hints.
 378      *
 379      * It does this by listening to {@link Hints#KEY_DIRTY} hint changes.
 380      *
 381      * @author Tuukka Lehtonen
 382      */
 383     class ElementHintListener implements IHintListener {
 384         @Override
 385         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
 386             if (key == Hints.KEY_DIRTY) {
 387                 if (newValue == Hints.VALUE_SG_DIRTY) {
 388                     if (sender instanceof IElement) {
 389                         assert getContext().getThreadAccess().currentThreadAccess();
 390                         Object task = BEGIN("element dirty");
 391
 392                         IElement e = (IElement) sender;
 393                         e.removeHint(Hints.KEY_DIRTY);
 394
 395                         if (DEBUG)
 396                             System.out.println("Element is dirty: " + e);
 397
 398                         updateSelfAndNeighbors(e, COMPLETE_UPDATE);
 399                         END(task);
 400                     }
 401                 }
 402             } else if (key == ElementHints.KEY_FOCUS_LAYERS || key == ElementHints.KEY_VISIBLE_LAYERS) {
 403                 if (sender instanceof IElement) {
 404                     assert getContext().getThreadAccess().currentThreadAccess();
 405                     IElement e = (IElement) sender;
 406                     Object task = BEGIN("layers changed: " + e);
 407                     update(e);
 408                     END(task);
 409                 }
 410             }
 411         }
 412
 413         @Override
 414         public void hintRemoved(IHintObservable sender, Key key, Object oldValue) {
 415         }
 416     }
 417
 418     private final ElementHintListener elementHintListener = new ElementHintListener();
 419
 420     private final Set<Transaction> activeTransactions = new HashSet<Transaction>();
 421
 422     @Override
 423     public void transactionStarted(IDiagram d, Transaction t) {
 424         activeTransactions.add(t);
 425     }
 426
 427     Consumer<IElement> COMPLETE_UPDATE = element -> {
 428         // Connections may need rerouting
 429         if (element.getElementClass().containsClass(ConnectionHandler.class))
 430             DiagramUtils.validateAndFix(diagram, Collections.singleton(element));
 431
 432         //System.out.println("COMPLETE_UPDATE(" + element + ")");
 433         update(element);
 434         updateSelection(element);
 435     };
 436
 437     Set<IElement> addRelatedElements(Set<IElement> elements) {
 438         RelationshipHandler rh = diagram.getDiagramClass().getAtMostOneItemOfClass(RelationshipHandler.class);
 439         if (rh != null) {
 440             relatedElements.clear();
 441             for (IElement el : elements) {
 442                 relations.clear();
 443                 rh.getRelations(diagram, el, relations);
 444                 for (Relation r : relations) {
 445                     Object obj = r.getObject();
 446                     if (obj instanceof IElement) {
 447                         relatedElements.add((IElement) obj);
 448                     }
 449                 }
 450                 relations.clear();
 451             }
 452             elements.addAll(relatedElements);
 453             relatedElements.clear();
 454         }
 455         return elements;
 456     }
 457
 458     /**
 459      * @param e
 460      * @param updateCallback
 461      */
 462     protected void updateSelfAndNeighbors(IElement e, Consumer<IElement> updateCallback) {
 463         // Slight optimization for cases that are known to be topologically
 464         // non-expandable.
 465         if (!isNotSelectionExpandable(e)) {
 466             Set<IElement> single = Collections.singleton(e);
 467
 468             Set<IElement> expanded =
 469                 // Also update all elements somehow related to e.
 470                 addRelatedElements(
 471                         // Get all topological neighbors and element self.
 472                         CollectionUtils.join(
 473                                 single,
 474                                 TopologicalSelectionExpander.expandSelection(diagram, single)
 475                         )
 476                 );
 477             // Perform the updates.
 478             for (IElement el : expanded) {
 479                 updateCallback.accept(el);
 480             }
 481         } else {
 482             updateCallback.accept(e);
 483         }
 484     }
 485
 486     /**
 487      * @param e
 488      * @return
 489      */
 490     protected boolean isNotSelectionExpandable(IElement e) {
 491         ElementClass ec = e.getElementClass();
 492         return !ec.containsClass(ConnectionHandler.class)
 493         && !ec.containsClass(BendsHandler.class)
 494         && !ec.containsClass(TerminalTopology.class);
 495     }
 496
 497     @Override
 498     public void transactionFinished(IDiagram d, Transaction t) {
 499         activeTransactions.remove(t);
 500     }
 501
 502     boolean inDiagramTransaction() {
 503         return !activeTransactions.isEmpty();
 504     }
 505
 506     @Override
 507     public void onElementAdded(IDiagram d, IElement e) {
 508         if (DEBUG)
 509             System.out.println("EP.onElementAdded(" + d + ", " + e + ")");
 510
 511         Map<INode, IElement> nodeElementMap = diagram.getHint(DiagramHints.NODE_TO_ELEMENT_MAP);
 512         if (inDiagramTransaction()) {
 513             addElement(d, e, false, nodeElementMap);
 514         } else {
 515             addElement(d, e, true, nodeElementMap);
 516         }
 517     }
 518     @Override
 519     public void onElementRemoved(IDiagram d, IElement e) {
 520         if (DEBUG)
 521             System.out.println("EP.onElementRemoved(" + d + ", " + e + ")");
 522
 523         removeElement(d, e, diagram.getHint(DiagramHints.NODE_TO_ELEMENT_MAP));
 524     }
 525
 526     @Override
 527     public void elementChildrenChanged(ChildEvent event) {
 528         if (DEBUG)
 529             System.out.println("EP.elementChildrenChanged: " + event);
 530
 531         Map<INode, IElement> nodeElementMap = diagram.getHint(DiagramHints.NODE_TO_ELEMENT_MAP);
 532
 533         for (IElement removed : event.removed) {
 534             removeElement(diagram, removed, nodeElementMap);
 535         }
 536         for (IElement added : event.added) {
 537             addElement(diagram, added, false, nodeElementMap);
 538         }
 539     }
 540
 541     private final List<IElement> childrenTemp = new ArrayList<IElement>();
 542
 543     public void addElement(IDiagram d, IElement e, boolean synchronizeSceneGraphNow, Map<INode, IElement> nodeElementMap) {
 544         if (DEBUG)
 545             System.out.println("EP.addElement(now=" + synchronizeSceneGraphNow + ", " + e + ")");
 546
 547         e.addKeyHintListener(Hints.KEY_DIRTY, elementHintListener);
 548         e.addKeyHintListener(ElementHints.KEY_VISIBLE_LAYERS, elementHintListener);
 549         e.addKeyHintListener(ElementHints.KEY_FOCUS_LAYERS, elementHintListener);
 550
 551         ElementClass clazz = e.getElementClass();
 552         G2DParentNode parentNode = elementParent;
 553         Key sgKey = ElementHints.KEY_SG_NODE;
 554
 555         Parent parent = clazz.getAtMostOneItemOfClass(Parent.class);
 556         if (parent != null) {
 557             IElement parentElement = parent.getParent(e);
 558             if (parentElement != null) {
 559                 SingleElementNode parentHolder = parentElement.getHint(sgKey);
 560                 if (parentHolder != null) {
 561                     parentNode = parentHolder;
 562                 }
 563             }
 564         }
 565
 566         boolean isConnection = e.getElementClass().containsClass(ConnectionHandler.class);
 567
 568         if(isConnection) {
 569
 570             ConnectionNode holder = e.getHint(sgKey);
 571             if (holder == null) {
 572                 holder = parentNode.addNode(ElementUtils.generateNodeId(e), ConnectionNode.class);
 573                 holder.setKey(e.getHint(ElementHints.KEY_OBJECT));
 574                 holder.setTypeClass(e.getHint(ElementHints.KEY_TYPE_CLASS));
 575                 holder.setTransferableProvider(new ElementTransferableProvider(getContext(), e));
 576                 e.setHint(sgKey, holder);
 577                 holder.setZIndex(parentNode.getNodeCount() + 1);
 578                 if (nodeElementMap != null)
 579                     nodeElementMap.put(holder, e);
 580             }
 581
 582         } else {
 583
 584             SingleElementNode holder = e.getHint(sgKey);
 585             if (holder == null) {
 586                 holder = parentNode.addNode(ElementUtils.generateNodeId(e), SingleElementNode.class);
 587                 holder.setKey(e.getHint(ElementHints.KEY_OBJECT));
 588                 holder.setTypeClass(e.getHint(ElementHints.KEY_TYPE_CLASS));
 589                 holder.setTransferableProvider(new ElementTransferableProvider(getContext(), e));
 590                 e.setHint(sgKey, holder);
 591                 holder.setZIndex(parentNode.getNodeCount() + 1);
 592                 if (nodeElementMap != null)
 593                     nodeElementMap.put(holder, e);
 594             }
 595
 596         }
 597
 598         Children children = clazz.getAtMostOneItemOfClass(Children.class);
 599         if (children != null) {
 600             children.addChildListener(e, this);
 601
 602             childrenTemp.clear();
 603             children.getChildren(e, childrenTemp);
 604             //System.out.println("children: " + childrenTemp);
 605             for (IElement child : childrenTemp) {
 606                 addElement(d, child, false, nodeElementMap);
 607             }
 608             childrenTemp.clear();
 609         }
 610
 611         if (synchronizeSceneGraphNow)
 612             updateElement(e, sgKey);
 613
 614         //setTreeDirty();
 615     }
 616
 617     protected void removeElement(IDiagram d, IElement e, Map<INode, IElement> nodeElementMap) {
 618         if (DEBUG)
 619             System.out.println("EP.removeElement(" + e + ")");
 620
 621         e.removeKeyHintListener(Hints.KEY_DIRTY, elementHintListener);
 622         e.removeKeyHintListener(ElementHints.KEY_VISIBLE_LAYERS, elementHintListener);
 623         e.removeKeyHintListener(ElementHints.KEY_FOCUS_LAYERS, elementHintListener);
 624
 625         ElementClass clazz = e.getElementClass();
 626         if (clazz.containsClass(Children.class)) {
 627             Children children = clazz.getSingleItem(Children.class);
 628             children.removeChildListener(e, this);
 629         }
 630
 631         List<SceneGraph> nodeHandlers = e.getElementClass().getItemsByClass(SceneGraph.class);
 632         for (SceneGraph n : nodeHandlers) {
 633             n.cleanup(e);
 634         }
 635
 636         // Remove all hints related to scene graph nodes to prevent leakage of
 637         // scene graph resources.
 638         Map<SceneGraphNodeKey, Object> sgHints = e.getHintsOfClass(SceneGraphNodeKey.class);
 639         for (SceneGraphNodeKey sgKey : sgHints.keySet()) {
 640             Node n = e.removeHint(sgKey);
 641             if (n != null) {
 642                 n.remove();
 643                 if (nodeElementMap != null)
 644                     nodeElementMap.remove(n);
 645             }
 646         }
 647
 648         //setTreeDirty();
 649     }
 650
 651     /**
 652      * Invalidate the whole scene graph spatial structure. It will be rebuilt by
 653      * RTreeNode when needed the next time.
 654      */
 655     private void setTreeDirty() {
 656         elementParent.setDirty();
 657     }
 658
 659     /**
 660      * Mark the specified node invalid with respect to the scene graph spatial
 661      * structure.
 662      *
 663      * @param node a scene graph node that has somehow changed
 664      */
 665     private void invalidateNode(INode node) {
 666         // TODO: optimize rtree updates instead of killing the whole tree
 667         elementParent.setDirty();
 668     }
 669
 670     // ------------------------------------------------------------------------
 671     // Diagram/Element hint listeners
 672     // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 673
 674     public void updateAll() {
 675         if (DEBUG)
 676             System.out.println("EP.updateAll()");
 677
 678         Object task = BEGIN("EP.updateAll");
 679         paintDiagram(elementParent, diagram, null);
 680         updateSelections();
 681         setTreeDirty();
 682         END(task);
 683     }
 684
 685     public void update(IElement element) {
 686         updateElement(element, ElementHints.KEY_SG_NODE);
 687     }
 688
 689     /**
 690      *
 691      * @param controlGC
 692      * @param diagram
 693      * @param elementsToPaint
 694      *            elements to paint or null for all elements
 695      */
 696     public void paintDiagram(G2DParentNode parent, IDiagram diagram, Collection<IElement> elementsToPaint) {
 697         Object task = BEGIN("EP.paintDiagram");
 698         paintDiagram(parent, diagram, elementsToPaint, ElementHints.KEY_SG_NODE);
 699         END(task);
 700     }
 701
 702     /**
 703      *
 704      * @param controlGC
 705      * @param diagram
 706      * @param elementsToPaint
 707      *            elements to paint or null for all elements
 708      */
 709     public void paintDiagram(G2DParentNode parent, IDiagram diagram, Collection<IElement> elementsToPaint, Key elementSgNodeKey) {
 710         if(diagram == null) return;
 711         ICanvasContext ctx = getContext();
 712         assert (ctx != null);
 713
 714         Boolean disablePaint = diagram.getHint(Hints.KEY_DISABLE_PAINTING);
 715         if (Boolean.TRUE.equals(disablePaint)) {
 716             parent.removeNodes();
 717             return;
 718         }
 719
 720         // Paint elementsToPaint in correct z-order from diagram.getElements()
 721         List<IElement> elements = diagram.getSnapshot();
 722
 723         Set<SingleElementNode> tmp = new HashSet<SingleElementNode>();
 724         int zIndex = 0;
 725         for (int pass = 0; pass < 1; ++pass) {
 726             for (IElement e : elements) {
 727                 if (elements != elementsToPaint && elementsToPaint != null)
 728                     if (!elementsToPaint.contains(e))
 729                         continue;
 730
 731                 if (DEBUG)
 732                     System.out.println("EP.paintDiagram(" + zIndex + ", " + e + ")");
 733
 734                 SingleElementNode holder = updateElement(parent, e, elementSgNodeKey, false);
 735                 if (holder != null) {
 736                     tmp.add(holder);
 737                     holder.setZIndex(++zIndex);
 738                 }
 739             }
 740         }
 741
 742         // Hide unaccessed nodes (but don't remove)
 743         for (IG2DNode node : parent.getNodes()) {
 744             if (!tmp.contains(node)) {
 745                 ((SingleElementNode)node).setVisible(false);
 746             }
 747         }
 748     }
 749
 750     public void updateElement(IElement e, Key elementSgNodeKey) {
 751         updateElement(null, e, elementSgNodeKey, true);
 752     }
 753
 754     /**
 755      * @param parent if <code>null</code> the scene graph node structure
 756      *        will not be created if it is missing
 757      * @param e
 758      * @param elementSgNodeKey
 759      * @param invalidateNode
 760      */
 761     public SingleElementNode updateElement(G2DParentNode parent, IElement e, Key elementSgNodeKey, boolean invalidateNode) {
 762         if (DEBUG)
 763             System.out.println("EP.updateElement(" + e + ", " + elementSgNodeKey + ")");
 764         Object task = BEGIN("EP.updateElement");
 765
 766         try {
 767             SingleElementNode holder = e.getHint(elementSgNodeKey);
 768             if (holder == null && parent == null)
 769                 return null;
 770
 771             if (ElementUtils.isHidden(e))
 772                 return null;
 773
 774 //            ElementClass ec = e.getElementClass();
 775 //            ILayers layers = diagram.getHint(DiagramHints.KEY_LAYERS);
 776 //            if (layers != null && !layers.getIgnoreVisibilitySettings()) {
 777 //                ElementLayers el = ec.getAtMostOneItemOfClass(ElementLayers.class);
 778 //                if (el != null && !el.isVisible(e, layers)) {
 779 //                    return null;
 780 //                }
 781 //            }
 782
 783             // Update the node scene graph through SceneGraph handlers.
 784             List<SceneGraph> nodeHandlers = e.getElementClass().getItemsByClass(SceneGraph.class);
 785             Collection<SceneGraph> decorators = e.getHint(ElementHints.KEY_DECORATORS);
 786             if (nodeHandlers.isEmpty() && (decorators == null || decorators.isEmpty()))
 787                 return null;
 788
 789             Composite composite = e.getHint(ElementHints.KEY_COMPOSITE);
 790
 791             if (holder == null) {
 792                 holder = parent.addNode(ElementUtils.generateNodeId(e), SingleElementNode.class);
 793                 e.setHint(elementSgNodeKey, holder);
 794             }
 795             holder.setComposite(composite);
 796             holder.setVisible(true);
 797
 798             for (SceneGraph n : nodeHandlers) {
 799                 n.init(e, holder);
 800             }
 801
 802             // Process decorators
 803             if (decorators == null || decorators.isEmpty()) {
 804                 holder.removeNode("decorators");
 805             } else {
 806                 G2DParentNode decoratorHolder = holder.getOrCreateNode("decorators", G2DParentNode.class);
 807                 decoratorHolder.removeNodes();
 808                 for (SceneGraph decorator : decorators) {
 809                     decorator.init(e, decoratorHolder);
 810                 }
 811             }
 812
 813             if (invalidateNode)
 814                 invalidateNode(holder);
 815
 816             return holder;
 817         } finally {
 818             END(task);
 819         }
 820     }
 821
 822     /**
 823      * @param elementsToUpdate to explicitly specify which elements to update
 824      *        the selection scene graph for, or <code>null</code> to update
 825      *        everything
 826      */
 827     public void updateSelections() {
 828         Object task = BEGIN("EP.updateSelections");
 829
 830         try {
 831             if (!paintSelectionFrames)
 832                 return;
 833             if (selection == null)
 834                 return;
 835
 836             boolean selectionsChanged = false;
 837
 838             // Update and "touch" all selections.
 839             Set<Integer> existingSelections = new HashSet<Integer>();
 840             Set<INode> selectionNodes = new HashSet<INode>();
 841             Set<INode> tmp = new HashSet<INode>();
 842             Map<INode, LinkNode> selectionLinks = new HashMap<INode, LinkNode>();
 843
 844             for (Map.Entry<Integer, Set<IElement>> entry : selection.getSelections().entrySet()) {
 845                 Integer selectionId = entry.getKey();
 846                 Set<IElement> selectedElements = entry.getValue();
 847
 848                 existingSelections.add(selectionId);
 849
 850 //                System.out.println("SELECTION[" + selectionId + "]: " + selectedElements);
 851                 ElementNodeBridge bridge = getOrCreateSelectionMap(selectionId);
 852                 selectionNodes.clear();
 853                 selectionsChanged |= paintSelection(selectedElements, selectionId, selectionNodes, bridge);
 854
 855                 // Remove selection nodes that were not referenced during the update.
 856 //                System.out.println("BRIDGE: " + bridge.toString());
 857 //                System.out.println("SELECTED: " + selectionNodes);
 858                 tmp.clear();
 859                 tmp.addAll(bridge.getRightSet());
 860                 tmp.removeAll(selectionNodes);
 861 //                System.out.println("REMOVED: " + tmp);
 862 //                System.out.println("BRIDGE BEFORE: " + bridge);
 863                 selectionsChanged |= bridge.retainAllRight(selectionNodes);
 864 //                System.out.println("BRIDGE AFTER: " + bridge);
 865
 866                 G2DParentNode selectionsNode = getSelectionsNode(selectionId);
 867                 selectionLinks.clear();
 868                 getSelectedNodeReferences(selectionsNode, selectionLinks);
 869
 870                 for (INode node : tmp) {
 871                     INode linkNode = selectionLinks.get(node.getParent());
 872                     if (linkNode != null) {
 873                         linkNode.remove();
 874                     }
 875 //                    System.out.println("REMOVED SELECTION: -> " + node);
 876                     node.remove();
 877                 }
 878             }
 879
 880             for (Iterator<Map.Entry<Integer, ElementNodeBridge>> iterator = selections.entrySet().iterator(); iterator.hasNext();) {
 881                 Map.Entry<Integer, ElementNodeBridge> entry = iterator.next();
 882                 Integer selectionId = entry.getKey();
 883                 if (!existingSelections.contains(selectionId)) {
 884                     // Selection no longer exists.
 885                     selectionsChanged = true;
 886                     for (INode node : entry.getValue().getRightSet()) {
 887 //                        System.out.println("REMOVED SELECTION: " + node);
 888                         node.remove();
 889                     }
 890                     iterator.remove();
 891
 892                     G2DParentNode selectionsNode = getSelectionsNode(selectionId);
 893                     selectionsNode.removeNodes();
 894                 }
 895             }
 896
 897             // Make sure the view is refreshed after selection changes.
 898             if (selectionsChanged) {
 899                 setDirty();
 900             }
 901         } finally {
 902             END(task);
 903         }
 904     }
 905
 906     private G2DParentNode getSelectionsNode() {
 907         G2DParentNode sels = NodeUtil.lookup(diagramParent, SceneGraphConstants.SELECTIONS_NODE_NAME, G2DParentNode.class);
 908         if (sels == null) {
 909             DataNode data= NodeUtil.lookup(diagramParent, SceneGraphConstants.DATA_NODE_NAME, DataNode.class);
 910             sels = data.addNode(SceneGraphConstants.SELECTIONS_NODE_NAME, G2DParentNode.class);
 911             sels.setLookupId(SceneGraphConstants.SELECTIONS_NODE_NAME);
 912         }
 913         return sels;
 914     }
 915
 916     private G2DParentNode getSelectionsNode(int selectionId) {
 917         G2DParentNode selectionsNode = getSelectionsNode();
 918         G2DParentNode s = selectionsNode.getOrCreateNode(String.valueOf(selectionId), G2DParentNode.class);
 919         return s;
 920     }
 921
 922     private Map<INode, LinkNode> getSelectedNodeReferences(G2DParentNode selectionsNode, Map<INode, LinkNode> result) {
 923         for (IG2DNode node : selectionsNode.getSortedNodes()) {
 924             if (node instanceof LinkNode) {
 925                 INode n = ((LinkNode) node).getDelegate();
 926                 if (n != null)
 927                     result.put(n, (LinkNode) node);
 928             }
 929         }
 930         return result;
 931     }
 932
 933     public void updateSelection(IElement el) {
 934         Object task = BEGIN("EP.updateSelection");
 935
 936         try {
 937             if (!paintSelectionFrames)
 938                 return;
 939
 940             G2DParentNode elementNode = (G2DParentNode) el.getHint(ElementHints.KEY_SG_NODE);
 941             if (elementNode == null)
 942                 return;
 943
 944             boolean nodesUpdated = false;
 945
 946             for (Map.Entry<Integer, ElementNodeBridge> entry : selections.entrySet()) {
 947                 Integer selectionId = entry.getKey();
 948                 ElementNodeBridge bridge = entry.getValue();
 949                 Color color = getSelectionColor(selectionId);
 950
 951                 G2DParentNode selectionNode = (G2DParentNode) bridge.getRight(el);
 952                 if (selectionNode == null)
 953                     continue;
 954
 955                 if (NodeUtil.needSelectionPaint(elementNode))
 956                     paintSelectionFrame(selectionId, elementNode, selectionNode, el, color);
 957
 958                 nodesUpdated = true;
 959             }
 960
 961             // Make sure the view is refreshed after selection changes.
 962             if (nodesUpdated)
 963                 setDirty();
 964         } finally {
 965             END(task);
 966         }
 967     }
 968
 969     /**
 970      * @param selection
 971      * @param selectionId
 972      * @param selectionNodes for collecting all the "selection" nodes created or
 973      *        referenced by this method
 974      * @param bridge
 975      * @return
 976      */
 977     public boolean paintSelection(Set<IElement> selection, int selectionId, Set<INode> selectionNodes, ElementNodeBridge bridge) {
 978
 979         boolean result = false;
 980         Color color = getSelectionColor(selectionId);
 981         G2DParentNode selectionsNode = getSelectionsNode(selectionId);
 982
 983         for (IElement e : selection) {
 984             Node elementNode = e.getHint(ElementHints.KEY_SG_NODE);
 985 //            System.out.println("selectionNode: " + elementNode + " " + e);
 986             if (elementNode instanceof G2DParentNode) {
 987                 G2DParentNode en = (G2DParentNode) elementNode;
 988                 G2DParentNode selectionNode = en.getOrCreateNode(NodeUtil.SELECTION_NODE_NAME, G2DParentNode.class);
 989                 selectionNode.setZIndex(SELECTION_PAINT_PRIORITY);
 990                 if (selectionNodes != null)
 991                     selectionNodes.add(selectionNode);
 992                 if (!bridge.containsLeft(e)) {
 993                     //System.out.println("ADDED SELECTION: " + e + " -> " + selectionNode);
 994                     bridge.map(e, selectionNode);
 995                     result = true;
 996                 }
 997
 998                 // Mark this node selected in the scene graph "data area"
 999                 createSelectionReference(selectionsNode, elementNode);
1000
1001                 if (NodeUtil.needSelectionPaint(elementNode))
1002                     paintSelectionFrame(selectionId, en, selectionNode, e, color);
1003
1004             } else {
1005                 if (elementNode != null) {
1006                     // Cannot paint selection for unrecognized non-parenting node
1007                     System.out.println("Cannot add selection child node for non-parent element node: " + elementNode);
1008                 }
1009             }
1010         }
1011
1012 //        if (selection.isEmpty()) {
1013 //            Node pivotNode = (Node) parent.getNode("pivot");
1014 //            if (pivotNode != null)
1015 //                pivotNode.remove();
1016 //        } else {
1017 //            Point2D pivot = ElementUtils.getElementBoundsCenter(selection, pivotPoint);
1018 //            if (pivot != null) {
1019 //                //System.out.println("painting pivot: " + pivot);
1020 //                SelectionPivotNode pivotNode = parent.getOrCreateNode("pivot", SelectionPivotNode.class);
1021 //                pivotNode.setPivot(pivot);
1022 //            } else {
1023 //                parent.removeNode("pivot");
1024 //            }
1025 //        }
1026
1027         return result;
1028     }
1029
1030     public void paintSelectionFrame(int selectionId, G2DParentNode elementNode, G2DParentNode selectionNode, final IElement e, Color color) {
1031         // The element node already has the correct transform.
1032         AffineTransform selectionTransform = ElementUtils.getTransform(e);// no it doesnt ... new AffineTransform();
1033         Shape shape = ElementUtils.getElementShapeOrBounds(e);
1034         Rectangle2D bounds = shape.getBounds2D();
1035         //System.out.println("selection bounds: "+bounds);
1036
1037         Point2D scale = GeometryUtils.getScale2D(selectionTransform);
1038         final double marginX = Math.abs(scale.getX()) > 1e-10 ? 1 / scale.getX() : 1;
1039         final double marginY = Math.abs(scale.getY()) > 1e-10 ? 1 / scale.getY() : 1;
1040
1041         bounds.setFrame(bounds.getMinX() - marginX, bounds.getMinY() - marginY, bounds.getWidth() + 2*marginX, bounds.getHeight() + 2*marginY);
1042
1043         List<SelectionSpecification> ss = e.getElementClass().getItemsByClass(SelectionSpecification.class);
1044         if (!ss.isEmpty()) {
1045             G2DParentNode shapeholder = selectionNode.getOrCreateNode(getNodeId("outlines", e), G2DParentNode.class);
1046
1047             for (SelectionSpecification es : ss) {
1048                 Outline outline = (Outline) es.getAdapter(Outline.class);
1049                 if (outline == null || outline.getElementShape(e) == null)
1050                         continue;
1051                 ShapeNode shapenode = shapeholder.getOrCreateNode(getNodeId("outline", e, es), ShapeNode.class);
1052 //                shapenode.setShape(es.getSelectionShape(e));
1053 //                shapenode.setStroke(SELECTION_STROKE);
1054 //                shapenode.setScaleStroke(true);
1055 //                shapenode.setColor(color);
1056 //                shapenode.setTransform(selectionTransform);
1057 //                shapenode.setFill(false);
1058                 shapenode.setShape(outline.getElementShape(e));
1059                 StrokeSpec strokeSpec = (StrokeSpec) es.getAdapter(StrokeSpec.class);
1060                 if (strokeSpec != null && strokeSpec.getStroke(e) != null)
1061                         shapenode.setStroke(strokeSpec.getStroke(e));
1062
1063                 shapenode.setScaleStroke(false);
1064                 //shapenode.setColor(color);
1065                 OutlineColorSpec foregroundColor = (OutlineColorSpec) es.getAdapter(OutlineColorSpec.class);
1066                 if (foregroundColor != null && foregroundColor.getColor(e) != null)
1067                         shapenode.setColor(foregroundColor.getColor(e));
1068
1069                 Transform transform = (Transform) es.getAdapter(Transform.class);
1070                 if (transform != null && transform.getTransform(e) != null)
1071                         shapenode.setTransform(transform.getTransform(e));
1072
1073                 shapenode.setFill(false);
1074                 FillColor fillColor = (FillColor) es.getAdapter(FillColor.class);
1075                 if (fillColor != null && fillColor.getFillColor(e) != null)
1076                     shapenode.setFill(true);
1077 //                      shapenode.setColor(ColorUtil.withAlpha(backgroundColor.getColor(e), 192));
1078             }
1079             return;
1080         }
1081
1082         List<SelectionOutline> shapeHandlers = e.getElementClass().getItemsByClass(SelectionOutline.class);
1083         if (!shapeHandlers.isEmpty()) {
1084             G2DParentNode shapeholder = selectionNode.getOrCreateNode(getNodeId("outlines", e), G2DParentNode.class);
1085
1086             for (SelectionOutline es : shapeHandlers) {
1087                 ShapeNode shapenode = shapeholder.getOrCreateNode(getNodeId("outline", e, es), ShapeNode.class);
1088 //                shapenode.setShape(es.getSelectionShape(e));
1089 //                shapenode.setStroke(SELECTION_STROKE);
1090 //                shapenode.setScaleStroke(true);
1091 //                shapenode.setColor(color);
1092 //                shapenode.setTransform(selectionTransform);
1093 //                shapenode.setFill(false);
1094                 shapenode.setShape(es.getSelectionShape(e));
1095                 shapenode.setStroke(null);
1096                 shapenode.setScaleStroke(false);
1097                 //shapenode.setColor(color);
1098                 shapenode.setColor(ColorUtil.withAlpha(color, 192));
1099                 shapenode.setTransform(selectionTransform);
1100                 shapenode.setFill(true);
1101             }
1102             return;
1103         }
1104
1105         ISelectionProvider provider = this.getContext().getDefaultHintContext().getHint(KEY_SELECTION_PROVIDER);
1106         if (provider != null) {
1107             provider.init(selectionId, e, selectionNode, getNodeId("shape", e), selectionTransform, bounds, color);
1108         } else {
1109             SelectionNode s = selectionNode.getOrCreateNode(getNodeId("shape", e), SelectionNode.class);
1110             s.init(selectionId, selectionTransform, bounds, color);
1111             Double paddingFactor = diagram.getHint(DiagramHints.SELECTION_PADDING_SCALE_FACTOR);
1112             if (paddingFactor != null)
1113                 s.setPaddingFactor(paddingFactor);
1114         }
1115     }
1116
1117     private void createSelectionReference(G2DParentNode selectionsNode, INode elementNode) {
1118         String id = NodeUtil.lookupId(elementNode);
1119         String uuid = null;
1120         if (id == null)
1121             id = uuid = UUID.randomUUID().toString();
1122         NodeUtil.map(elementNode, id);
1123         LinkNode link = selectionsNode.getOrCreateNode(id, LinkNode.class);
1124         link.setDelegateId(id);
1125         link.setIgnoreDelegate(true);
1126         link.setLookupIdOwner(uuid != null);
1127     }
1128
1129     private transient CharBuffer buf = CharBuffer.allocate(32);
1130
1131     private String getNodeId(String prefix, Object first) {
1132         return getNodeId(prefix, first, null);
1133     }
1134
1135     private String getNodeId(String prefix, Object first, Object second) {
1136         buf.clear();
1137         if (prefix != null)
1138             buf.append(prefix);
1139         if (first != null) {
1140             buf.append('_');
1141             buf.append("" + first.hashCode());
1142         }
1143         if (second != null) {
1144             buf.append('_');
1145             buf.append("" + second.hashCode());
1146         }
1147         buf.limit(buf.position());
1148         buf.rewind();
1149         //System.out.println("node id: " + buf.toString());
1150         return buf.toString();
1151     }
1152
1153     /**
1154      * Get selection color for a selection Id
1155      * @param selectionId selection id
1156      * @return color for the id
1157      */
1158     protected Color getSelectionColor(int selectionId) {
1159         if (selectionId == 0) {
1160             Color c = getHint(KEY_SELECTION_FRAME_COLOR);
1161             if (c != null)
1162                 return c;
1163             return Color.BLACK;
1164         }
1165         Color c = selectionColor.get(selectionId);
1166         if (c == null) {
1167             Random r = new Random(selectionId);
1168             c = new Color(r.nextFloat(), r.nextFloat(), r.nextFloat());
1169             selectionColor.put(selectionId, c);
1170         }
1171         return c;
1172     }
1173
1174     private transient ConcurrentMap<Integer, ElementNodeBridge> selections = new ConcurrentHashMap<Integer, ElementNodeBridge>();
1175
1176     ElementNodeBridge getSelectionMap(int selectionId) {
1177         return selections.get(Integer.valueOf(selectionId));
1178     }
1179
1180     ElementNodeBridge getOrCreateSelectionMap(int selectionId) {
1181         Integer id = Integer.valueOf(selectionId);
1182         synchronized (selections) {
1183             ElementNodeBridge map = selections.get(id);
1184             if (map != null)
1185                 return map;
1186
1187             selections.put(id, map = new ElementNodeBridge(id));
1188             return map;
1189         }
1190     }
1191
1192     private transient Map<Integer, Color>     selectionColor              = new HashMap<Integer, Color>();
1193
1194     private transient BasicStroke             SELECTION_STROKE            = new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
1195             BasicStroke.JOIN_BEVEL, 10.0f,
1196             new float[] { 5.0f, 5.0f }, 0.0f);
1197
1198     private transient Point2D                 pivotPoint                  = new Point2D.Double();
1199
1200     @HintListener(Class=Selection.class, Field="SELECTION0")
1201     public void selectionChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
1202         //System.out.println("new selection: " + newValue);
1203         updateSelections();
1204     }
1205
1206     @HintListener(Class=Selection.class, Field="SELECTION0")
1207     public void selectionRemoved(IHintObservable sender, Key key, Object oldValue) {
1208         //System.out.println("selection removed: " + oldValue);
1209         updateSelections();
1210     }
1211
1212     private static Object BEGIN(String name) {
1213         if (DEBUG) {
1214             //return ThreadLog.BEGIN(name);
1215         }
1216         return null;
1217     }
1218
1219     private static void END(Object task) {
1220         if (DEBUG) {
1221             //((Task) task).end();
1222         }
1223     }
1224
1225 }