bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/RouteGraphUtils.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012, 2016 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 - refactoring
  12  *******************************************************************************/
  13 package org.simantics.diagram.adapter;
  14
  15 import java.awt.BasicStroke;
  16 import java.awt.Color;
  17 import java.awt.Shape;
  18 import java.awt.Stroke;
  19 import java.awt.geom.AffineTransform;
  20 import java.awt.geom.Rectangle2D;
  21 import java.util.Collection;
  22 import java.util.Collections;
  23 import java.util.Map;
  24 import java.util.Set;
  25
  26 import org.simantics.databoard.Bindings;
  27 import org.simantics.db.ReadGraph;
  28 import org.simantics.db.Resource;
  29 import org.simantics.db.Session;
  30 import org.simantics.db.Statement;
  31 import org.simantics.db.common.procedure.adapter.TransientCacheListener;
  32 import org.simantics.db.common.request.ResourceRead2;
  33 import org.simantics.db.common.request.UnaryRead;
  34 import org.simantics.db.common.utils.NameUtils;
  35 import org.simantics.db.exception.DatabaseException;
  36 import org.simantics.diagram.connection.ConnectionVisuals;
  37 import org.simantics.diagram.connection.RouteGraph;
  38 import org.simantics.diagram.connection.RouteGraphConnectionClass;
  39 import org.simantics.diagram.connection.RouteLine;
  40 import org.simantics.diagram.connection.RouteNode;
  41 import org.simantics.diagram.connection.RouteTerminal;
  42 import org.simantics.diagram.connection.rendering.BasicConnectionStyle;
  43 import org.simantics.diagram.connection.rendering.ConnectionStyle;
  44 import org.simantics.diagram.connection.rendering.StyledRouteGraphRenderer;
  45 import org.simantics.diagram.connection.rendering.arrows.ArrowLineEndStyle;
  46 import org.simantics.diagram.connection.rendering.arrows.ILineEndStyle;
  47 import org.simantics.diagram.connection.rendering.arrows.PlainLineEndStyle;
  48 import org.simantics.diagram.content.EdgeResource;
  49 import org.simantics.diagram.content.TerminalMap;
  50 import org.simantics.diagram.query.DiagramRequests;
  51 import org.simantics.diagram.stubs.DiagramResource;
  52 import org.simantics.diagram.stubs.G2DResource;
  53 import org.simantics.diagram.synchronization.graph.DiagramGraphUtil;
  54 import org.simantics.diagram.synchronization.graph.RouteGraphConnection;
  55 import org.simantics.g2d.canvas.ICanvasContext;
  56 import org.simantics.g2d.canvas.impl.CanvasContext;
  57 import org.simantics.g2d.diagram.IDiagram;
  58 import org.simantics.g2d.diagram.handler.Topology.Connection;
  59 import org.simantics.g2d.diagram.impl.ElementDiagram;
  60 import org.simantics.g2d.element.ElementUtils;
  61 import org.simantics.g2d.element.IElement;
  62 import org.simantics.g2d.element.handler.EdgeVisuals.EdgeEnd;
  63 import org.simantics.g2d.elementclass.FlagClass.Type;
  64 import org.simantics.layer0.Layer0;
  65 import org.simantics.scenegraph.g2d.nodes.connection.RouteGraphChangeEvent;
  66 import org.simantics.scenegraph.utils.GeometryUtils;
  67 import org.simantics.structural.stubs.StructuralResource2;
  68 import org.simantics.structural2.modelingRules.CPTerminal;
  69 import org.simantics.structural2.modelingRules.IAttachmentRelationMap;
  70 import org.simantics.structural2.modelingRules.IModelingRules;
  71 import org.simantics.utils.threads.CurrentThread;
  72
  73 import gnu.trove.map.hash.THashMap;
  74 import gnu.trove.set.hash.THashSet;
  75
  76 public class RouteGraphUtils {
  77
  78     public static boolean DEBUG = false;
  79
  80     public static final ILineEndStyle HEAD  = new ArrowLineEndStyle("fill 2 1 0");
  81     public static final ILineEndStyle TAIL  = PlainLineEndStyle.INSTANCE;
  82
  83     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection) throws DatabaseException {
  84         ICanvasContext canvas = new CanvasContext(CurrentThread.getThreadAccess());
  85         IDiagram diagram = new ElementDiagram(canvas);
  86         return load(graph, diagramRuntime, connection, canvas, diagram);
  87     }
  88
  89     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection, ICanvasContext canvas, IDiagram diagram) throws DatabaseException {
  90         Layer0 L0 = Layer0.getInstance(graph);
  91         Resource diagramResource = graph.getPossibleObject(connection, L0.PartOf);
  92         IModelingRules modelingRules = graph.syncRequest(DiagramRequests.getModelingRules(diagramResource, null), TransientCacheListener.<IModelingRules>instance());
  93         return load(graph, diagramRuntime, connection, canvas, diagram, modelingRules, null);
  94     }
  95
  96     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection, ICanvasContext canvas, IDiagram diagram, IModelingRules modelingRules, Set<BackendConnection> backendConnections) throws DatabaseException {
  97
  98         DiagramResource DIA = DiagramResource.getInstance(graph);
  99         StructuralResource2 STR = StructuralResource2.getInstance(graph);
 100
 101         RouteGraph rg = new RouteGraph();
 102
 103         // Default capacity should be enough for common cases.
 104         Set<EdgeResource> links = new THashSet<EdgeResource>();
 105         Map<Object, RouteNode> nodeByData = new THashMap<Object, RouteNode>();
 106
 107         // Load all route graph interior RouteNodes: route lines and points
 108         for (Resource interiorNode : graph.getObjects(connection, DIA.HasInteriorRouteNode)) {
 109             if (graph.isInstanceOf(interiorNode, DIA.RouteLine)) {
 110                 Boolean isHorizontal = graph.getRelatedValue(interiorNode, DIA.IsHorizontal, Bindings.BOOLEAN);
 111                 Double position = graph.getRelatedValue(interiorNode, DIA.HasPosition, Bindings.DOUBLE);
 112                 RouteLine line = rg.addLine(isHorizontal, position);
 113                 line.setData( RouteGraphConnection.serialize(graph, interiorNode) );
 114
 115                 nodeByData.put( interiorNode, line );
 116
 117                 for (Resource connectedTo : graph.getObjects(interiorNode, DIA.AreConnected)) {
 118                     links.add( new EdgeResource(interiorNode, connectedTo) );
 119                 }
 120             } else if (graph.isInstanceOf(interiorNode, DIA.RoutePoint)) {
 121                 // Not supported yet. Ignore.
 122             }
 123         }
 124
 125         Rectangle2D bounds = new Rectangle2D.Double();
 126         Map<Resource, Resource> connectorToModeledAttachment = null;
 127
 128         // Primarily the loader will believe what modeling rules say about
 129         // connector attachment relations.
 130         //
 131         // If modeling rules decide nothing, then we simply believe what the
 132         // the attachment relations in the graph say.
 133         //
 134         // Special case 1: connection with two (2) terminals
 135         // If the attachment of one of two terminals is decided by modeling
 136         // rules, the other attachment shall be the opposite of the decided
 137         // attachment (see forcedAttachmentRelation below).
 138         //
 139         // Special case 2: connected to a flag
 140         // If the attached element is a flag and modeling rules say nothing
 141         // about it, believe the direction stated by the flag type.
 142
 143         Collection<Statement> toConnectorStatements = graph.getStatements(connection, DIA.HasConnector);
 144         int terminalCount = 0;
 145
 146         // See if modeling rules judge any of the connection terminal attachments.
 147         if (modelingRules != null) {
 148             for (Statement toConnector : toConnectorStatements) {
 149                 Resource connector = toConnector.getObject();
 150
 151                 Statement terminalStm = findTerminalStatement(graph, connection, connector, STR);
 152                 if (terminalStm == null)
 153                     // Ignore broken connector: attached to the connection but not to any terminal.
 154                     continue;
 155
 156                 Resource terminalElement = terminalStm.getObject();
 157                 Resource connectionRelation = graph.getPossibleInverse(terminalStm.getPredicate());
 158                 if (connectionRelation == null)
 159                     continue;
 160
 161                 ++terminalCount;
 162
 163                 IAttachmentRelationMap map = modelingRules.getAttachmentRelations(graph, connection);
 164                 Resource attachment = map.get(graph, new CPTerminal(terminalElement, connectionRelation));
 165                 if (attachment != null) {
 166                     // Primary: believe modeling rules
 167                     if (connectorToModeledAttachment == null)
 168                         connectorToModeledAttachment = new THashMap<Resource, Resource>(toConnectorStatements.size());
 169                     connectorToModeledAttachment.put(connector, attachment);
 170                     if (DEBUG)
 171                         System.out.println("modeling rules decided attachment: " + NameUtils.getSafeName(graph, attachment, true) + " for (" + NameUtils.toString(graph, toConnector, true) + ") & (" + NameUtils.toString(graph, terminalStm, true) + ")");
 172                 } else if (graph.isInstanceOf(terminalElement, DIA.Flag)) {
 173                     // Secondary: believe flag type
 174                     attachment = resolveFlagAttachment(graph, connection, terminalElement, modelingRules, DIA);
 175                     if (attachment != null) {
 176                         if (connectorToModeledAttachment == null)
 177                             connectorToModeledAttachment = new THashMap<Resource, Resource>(toConnectorStatements.size());
 178                         connectorToModeledAttachment.put(connector, attachment);
 179                         if (DEBUG)
 180                             System.out.println("flag type decided attachment: " + NameUtils.getSafeName(graph, attachment, true) + " for (" + NameUtils.toString(graph, toConnector, true) + ") & (" + NameUtils.toString(graph, terminalStm, true) + ")");
 181                     }
 182                 }
 183             }
 184         }
 185
 186         if (connectorToModeledAttachment == null)
 187             connectorToModeledAttachment = Collections.emptyMap();
 188
 189         Resource forcedAttachmentRelation = null;
 190         if (terminalCount == 2 && connectorToModeledAttachment.size() == 1) {
 191             forcedAttachmentRelation = getInverseAttachment(graph, connectorToModeledAttachment.values().iterator().next(), DIA);
 192             if (DEBUG)
 193                 System.out.println("set forced attachment: " + NameUtils.getSafeLabel(graph, forcedAttachmentRelation));
 194         }
 195
 196         Resource connectionType = graph.getPossibleObject(connection, STR.HasConnectionType);
 197
 198         // Load all node terminal connections as RouteTerminals
 199         for (Statement toConnector : toConnectorStatements) {
 200             Resource connector = toConnector.getObject();
 201             Resource attachmentRelation = toConnector.getPredicate();
 202             if (DEBUG)
 203                 System.out.println("original attachment relation: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 204
 205             Statement terminalStm = findTerminalStatement(graph, connection, connector, STR);
 206             if (terminalStm == null)
 207                 // Ignore broken connector: attached to the connection but not to any terminal.
 208                 continue;
 209
 210             Resource terminalElement = terminalStm.getObject();
 211             Resource terminalElementType = graph.getPossibleType(terminalElement, DIA.Element);
 212             if (terminalElementType == null)
 213                 // Ignore non-element terminal elements
 214                 continue;
 215
 216             Resource connectionRelation = graph.getPossibleInverse(terminalStm.getPredicate());
 217             if (connectionRelation == null)
 218                 continue;
 219
 220             // Discover node and terminal this connector is connected to.
 221             TerminalMap terminals = graph.syncRequest(DiagramRequests.elementTypeTerminals(terminalElementType),
 222                     TransientCacheListener.<TerminalMap>instance());
 223             Resource terminal = terminals.getTerminal(connectionRelation);
 224             if (terminal == null) {
 225                 System.err.println(
 226                         "RouteGraphUtils: Could not find terminal for connection point "
 227                         + NameUtils.getSafeName(graph, connectionRelation, true)
 228                         + " in element "
 229                         + NameUtils.getSafeName(graph, terminalElement, true));
 230                 continue;
 231             }
 232
 233             double[] position = graph.getRelatedValue(connector, DIA.HasRelativeLocation, Bindings.DOUBLE_ARRAY);
 234             if (position.length != 2)
 235                 position = new double[] { 0, 0 };
 236
 237             if (DEBUG) {
 238                 System.out.println("terminalStm: " + NameUtils.toString(graph, terminalStm));
 239                 System.out.println("terminal: " + graph.getURI(terminalStm.getPredicate()));
 240             }
 241             AffineTransform terminalElementTr = diagramRuntime != null ?
 242                     DiagramGraphUtil.getDynamicWorldTransform(graph, diagramRuntime, terminalElement) :
 243                     DiagramGraphUtil.getWorldTransform(graph, terminalElement);
 244
 245             if (DEBUG)
 246                 System.out.println("terminalElementTr: " + terminalElementTr);
 247
 248             double x = terminalElementTr.getTranslateX();
 249             double y = terminalElementTr.getTranslateY();
 250             double minx = x-1, miny = y-1, maxx = x+1, maxy = y+1;
 251             int direction = 0x0;
 252
 253             // Use modelingRules to ascertain the proper attachmentRelation
 254             // for this terminal connection, if available.
 255             Resource att = connectorToModeledAttachment.get(connector);
 256             if (att != null) {
 257                 attachmentRelation = att;
 258                 if (DEBUG)
 259                     System.out.println("modeling rules attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 260             } else if (forcedAttachmentRelation != null) {
 261                 attachmentRelation = forcedAttachmentRelation;
 262                 if (DEBUG)
 263                     System.out.println("forced rules attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 264             }
 265             if (DEBUG)
 266                 System.out.println("decided attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 267
 268             // Get element bounds to decide allowed terminal direction(s)
 269             IElement te = graph.syncRequest(DiagramRequests.getElement(canvas, diagram, terminalElement, null));
 270             ElementUtils.getElementBounds(te, bounds);
 271             {
 272                 Shape shp = org.simantics.g2d.utils.GeometryUtils.transformShape(bounds, terminalElementTr);
 273                 bounds.setFrame(shp.getBounds2D());
 274             }
 275
 276             // Expand bounds by 2mm to make the connections enter the terminals
 277             // at a straight angle and from a distance instead of coming in
 278             // "horizontally".
 279             GeometryUtils.expandRectangle(bounds, 2);
 280             minx = bounds.getMinX();
 281             miny = bounds.getMinY();
 282             maxx = bounds.getMaxX();
 283             maxy = bounds.getMaxY();
 284
 285             AffineTransform terminalPos = DiagramGraphUtil.getDynamicAffineTransform(graph, terminalElement, terminal);
 286             //AffineTransform terminalPos2 = DiagramGraphUtil.getAffineTransform(graph, terminal);
 287             if (terminalPos != null) {
 288                 if (DEBUG) {
 289                     System.out.println("terminalPos: " + terminalPos);
 290                     //System.out.println("terminalPos2: " + terminalPos2);
 291                 }
 292                 terminalElementTr.concatenate(terminalPos);
 293                 if (DEBUG)
 294                     System.out.println("terminalElementTr: " + terminalElementTr);
 295                 x = terminalElementTr.getTranslateX();
 296                 y = terminalElementTr.getTranslateY();
 297             }
 298
 299             Integer allowedDirections = graph.getPossibleRelatedValue(terminal, DIA.Terminal_AllowedDirections, Bindings.INTEGER);
 300             if (allowedDirections != null) {
 301                 direction |= allowedDirections;
 302                 direction = rotateDirection(direction, terminalElementTr);
 303             } else {
 304                 direction |= RouteGraphConnectionClass.shortestDirectionOutOfBounds(x, y, bounds);
 305             }
 306             //System.out.println("DIR(" + x + ", " + y + ", " + bounds + "): " + Integer.toHexString(direction));
 307
 308             if (backendConnections != null) {
 309                 backendConnections.add(
 310                         new BackendConnection(
 311                                 toEdgeEnd(graph, attachmentRelation, EdgeEnd.Begin, DIA),
 312                                 terminalElement,
 313                                 terminal)
 314                         );
 315             }
 316
 317             if (direction == 0)
 318                 // Accept any horizontal/vertical direction if nothing is defined
 319                 direction = 0xf;
 320
 321             if (graph.<Boolean>getRelatedValue(connector, DIA.Connector_straight, Bindings.BOOLEAN))
 322                 direction |= RouteTerminal.DIR_DIRECT;
 323             // FIXME: routegraph crashes if this is done for all terminals regardless of the amount of terminals.
 324
 325             if (DEBUG)
 326                 System.out.println("load line style: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 327             ILineEndStyle endStyle = loadLineEndStyle(graph, attachmentRelation, connectionType, TAIL);
 328
 329             RouteTerminal routeTerminal = rg.addTerminal(x, y, minx, miny, maxx, maxy, direction, endStyle);
 330             routeTerminal.setData( RouteGraphConnection.serialize(graph, connector) );
 331
 332             nodeByData.put( connector, routeTerminal );
 333
 334             for (Resource connectedTo : graph.getObjects(connector, DIA.AreConnected)) {
 335                 links.add( new EdgeResource(connectedTo, connector) );
 336             }
 337         }
 338
 339         // Finish route graph loading by Linking route nodes together
 340         for (EdgeResource link : links) {
 341             RouteNode n1 = nodeByData.get(link.first());
 342             RouteNode n2 = nodeByData.get(link.second());
 343             if (n1 == null || n2 == null) {
 344                 System.err.println("Stray connection link found: " + link.toString(graph));
 345                 continue;
 346             }
 347             rg.link(n1, n2);
 348         }
 349
 350         return rg;
 351
 352     }
 353
 354     public static EdgeEnd toEdgeEnd(ReadGraph graph, Resource attachmentRelation, EdgeEnd defaultValue, DiagramResource DIA)
 355             throws DatabaseException {
 356         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 357             return EdgeEnd.Begin;
 358         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 359             return EdgeEnd.End;
 360         return defaultValue;
 361     }
 362
 363     public static Resource resolveFlagAttachment(ReadGraph graph, Resource connection, Resource flag, IModelingRules modelingRules, DiagramResource DIA) throws DatabaseException {
 364         Type type = resolveFlagType(graph, connection, flag, modelingRules, DIA);
 365         if (type != null) {
 366             switch (type) {
 367                 case In: return DIA.HasPlainConnector;
 368                 case Out: return DIA.HasArrowConnector;
 369             }
 370         }
 371         return null;
 372     }
 373
 374     private static Type resolveFlagType(ReadGraph graph, Resource connection, Resource flag, IModelingRules modelingRules, DiagramResource DIA) throws DatabaseException {
 375         return readFlagType(graph, flag, DIA);
 376     }
 377
 378     private static Type readFlagType(ReadGraph graph, Resource flag, DiagramResource DIA) throws DatabaseException {
 379         Resource flagType = graph.getPossibleObject(flag, DIA.HasFlagType);
 380         Type type = DiagramGraphUtil.toFlagType(DIA, flagType);
 381         return type;
 382     }
 383
 384     public static Statement findTerminalStatement(ReadGraph graph, Resource connection, Resource connector, StructuralResource2 STR)
 385             throws DatabaseException {
 386         for (Statement stm : graph.getStatements(connector, STR.Connects)) {
 387             if (connection.equals(stm.getObject()))
 388                 continue;
 389             return stm;
 390         }
 391         return null;
 392     }
 393
 394     public static Resource getInverseAttachment(ReadGraph graph, Resource attachmentRelation, DiagramResource DIA)
 395             throws DatabaseException {
 396         Resource inverse = graph.getPossibleObject(attachmentRelation, DIA.HasInverseAttachment);
 397         if (inverse != null)
 398             return inverse;
 399         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 400             return DIA.HasPlainConnector;
 401         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 402             return DIA.HasArrowConnector;
 403         return null;
 404     }
 405
 406     public static ILineEndStyle loadLineEndStyle(ReadGraph graph, Resource attachmentRelation, ILineEndStyle defaultValue)
 407             throws DatabaseException {
 408         ILineEndStyle style = graph.syncRequest(new LineEndStyle(attachmentRelation),
 409                 TransientCacheListener.<ILineEndStyle>instance());
 410         return style != null ? style : defaultValue;
 411     }
 412
 413     public static ILineEndStyle loadLineEndStyle(ReadGraph graph, Resource attachmentRelation, Resource connectionType, ILineEndStyle defaultValue)
 414             throws DatabaseException {
 415         if(connectionType != null) {
 416             ILineEndStyle style = graph.syncRequest(new LineEndStyleWithType(attachmentRelation, connectionType),
 417                     TransientCacheListener.<ILineEndStyle>instance());
 418             return style != null ? style : defaultValue;
 419         } else {
 420             ILineEndStyle style = graph.syncRequest(new LineEndStyle(attachmentRelation),
 421                     TransientCacheListener.<ILineEndStyle>instance());
 422             return style != null ? style : defaultValue;
 423         }
 424     }
 425
 426     /**
 427      * A request for caching ILineEndStyle results.
 428      */
 429     public static class LineEndStyle extends UnaryRead<Resource, ILineEndStyle> {
 430         public LineEndStyle(Resource attachmentRelation) {
 431             super(attachmentRelation);
 432         }
 433         @Override
 434         public ILineEndStyle perform(ReadGraph graph) throws DatabaseException {
 435             return loadLineEndStyle0(graph, parameter);
 436         }
 437     }
 438
 439     public static class LineEndStyleWithType extends ResourceRead2<ILineEndStyle> {
 440         public LineEndStyleWithType(Resource attachmentRelation, Resource connectionType) {
 441             super(attachmentRelation, connectionType);
 442         }
 443         @Override
 444         public ILineEndStyle perform(ReadGraph graph) throws DatabaseException {
 445             return loadLineEndStyle0(graph, resource, resource2);
 446         }
 447     }
 448
 449     private static ILineEndStyle loadLineEndStyle0(ReadGraph graph, Resource attachmentRelation)
 450             throws DatabaseException {
 451         ILineEndStyle style = graph.getPossibleAdapter(attachmentRelation, ILineEndStyle.class);
 452         if (style != null)
 453             return style;
 454         DiagramResource DIA = DiagramResource.getInstance(graph);
 455         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 456             return HEAD;
 457         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 458             return TAIL;
 459         return null;
 460     }
 461
 462     private static ILineEndStyle loadLineEndStyle0(ReadGraph graph, Resource attachmentRelation, Resource connectionType)
 463             throws DatabaseException {
 464         DiagramResource DIA = DiagramResource.getInstance(graph);
 465         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector)) {
 466             if(connectionType != null) {
 467                 G2DResource G2D = G2DResource.getInstance(graph);
 468                 Resource end = graph.getPossibleObject(connectionType, G2D.HasEndArrow);
 469                 if(end != null) {
 470                     Double size = graph.getPossibleRelatedValue(end, G2D.HasSize, Bindings.DOUBLE);
 471                     if(size == null) size = 0.0;
 472                     Double widthRatio = graph.getPossibleRelatedValue(end, G2D.HasWidthRatio, Bindings.DOUBLE);
 473                     if(widthRatio == null) widthRatio = 1.0;
 474                     Double space = graph.getPossibleRelatedValue(end, G2D.HasSpace, Bindings.DOUBLE);
 475                     if(space == null) space = 0.0;
 476
 477                     Resource c = graph.getPossibleObject(end, G2D.HasColor);
 478                     Color color = null;
 479                     if (c != null) {
 480                         float[] col = graph.getPossibleValue(c, Bindings.FLOAT_ARRAY);
 481                         if (col != null && col.length >= 3) {
 482                             color = new Color(col[0], col[1], col[2]);
 483                         }
 484                     }
 485
 486                     return new ArrowLineEndStyle(size, widthRatio*size, space, color);
 487                 }
 488             }
 489         }
 490         return loadLineEndStyle0(graph, attachmentRelation);
 491     }
 492
 493     /**
 494      * @param graph
 495      * @param canvas
 496      * @param style
 497      * @return
 498      * @throws DatabaseException
 499      */
 500     public static StyledRouteGraphRenderer getRenderer(ReadGraph graph, ConnectionStyle style)
 501             throws DatabaseException {
 502         return graph.syncRequest(new Renderer(style),
 503                 TransientCacheListener.<StyledRouteGraphRenderer>instance());
 504     }
 505
 506     /**
 507      * A request for caching StyledRouteGraphRenderer results.
 508      */
 509     public static class Renderer extends UnaryRead<ConnectionStyle, StyledRouteGraphRenderer> {
 510         public Renderer(ConnectionStyle style) {
 511             super(style);
 512         }
 513         @Override
 514         public StyledRouteGraphRenderer perform(ReadGraph graph) throws DatabaseException {
 515             return new StyledRouteGraphRenderer(parameter);
 516         }
 517     }
 518
 519     /**
 520      * @param graph
 521      * @param canvas
 522      * @param modelingRules
 523      * @param connection
 524      * @return
 525      * @throws DatabaseException
 526      */
 527     protected static ConnectionStyle readConnectionStyle(ReadGraph graph, IModelingRules modelingRules, Resource connection, StructuralResource2 STR) throws DatabaseException {
 528         Resource connectionType = null;
 529         if (modelingRules != null)
 530             connectionType = modelingRules.getConnectionType(graph, connection);
 531         if (connectionType == null)
 532             connectionType = graph.getPossibleObject(connection, STR.HasConnectionType);
 533         return readConnectionStyleFromConnectionType(graph, connectionType);
 534     }
 535
 536     protected static ConnectionStyle readConnectionStyleFromConnectionType(ReadGraph graph, Resource connectionType) throws DatabaseException {
 537         return graph.syncRequest(new ReadConnectionStyleFromConnectionType(connectionType),
 538                 TransientCacheListener.<ConnectionStyle>instance());
 539     }
 540
 541     /**
 542      * A request for caching ConnectionStyle results.
 543      */
 544     public static class ReadConnectionStyleFromConnectionType extends UnaryRead<Resource, ConnectionStyle> {
 545         public ReadConnectionStyleFromConnectionType(Resource connectionType) {
 546             super(connectionType);
 547         }
 548         @Override
 549         public ConnectionStyle perform(ReadGraph graph) throws DatabaseException {
 550             return readConnectionStyleFromConnectionType0(graph, parameter);
 551         }
 552     }
 553
 554     protected static ConnectionStyle readConnectionStyleFromConnectionType0(ReadGraph graph, Resource connectionType) throws DatabaseException {
 555         ConnectionVisuals cv = null;
 556         if (connectionType != null)
 557             cv = graph.syncRequest(DiagramRequests.getConnectionVisuals(connectionType),
 558                     TransientCacheListener.<ConnectionVisuals>instance());
 559
 560         // Fixed style settings
 561         Color branchPointColor = Color.BLACK;
 562         double branchPointRadius = 0.5;
 563         double degenerateLineLength = 0.8;
 564
 565         Color lineColor = cv != null ? cv.toColor() : null;
 566         if (lineColor == null)
 567             lineColor = Color.DARK_GRAY;
 568         Stroke lineStroke = cv != null ? cv.stroke : null;
 569         if (lineStroke == null)
 570             lineStroke = new BasicStroke(0.1f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 10, null, 0);
 571         Stroke routeLineStroke = GeometryUtils.scaleStrokeWidth(lineStroke, 2);
 572
 573         return new BasicConnectionStyle(
 574                 lineColor,
 575                 branchPointColor,
 576                 branchPointRadius,
 577                 lineStroke,
 578                 routeLineStroke,
 579                 degenerateLineLength);
 580     }
 581
 582     public static void scheduleSynchronize(Session session, Resource connection, RouteGraphChangeEvent event) {
 583         session.asyncRequest(RouteGraphConnection.synchronizer(connection, event));
 584     }
 585
 586     // ------------------------------------------------------------------------
 587     // RouteGraph RouteTerminal allowed direction rotation support
 588     // ------------------------------------------------------------------------
 589
 590     public static int rotateDirection(int direction, AffineTransform at) {
 591         // When direct routing is enabled, no point in wasting time rotating.
 592         if ((direction & RouteTerminal.DIR_DIRECT) != 0)
 593             return direction;
 594
 595         final int mask = (AffineTransform.TYPE_MASK_ROTATION | AffineTransform.TYPE_FLIP);
 596         boolean rotatedOrFlipped = (at.getType() & mask) != 0;
 597         if (rotatedOrFlipped) {
 598             double xAxisAngle = Math.atan2( at.getShearY(), at.getScaleX() );
 599             double yAxisAngle = Math.atan2( at.getScaleY(), at.getShearX() );
 600
 601             int xQuadrant = mainQuadrant(xAxisAngle);
 602             int yQuadrant = mainQuadrant(yAxisAngle);
 603
 604             int xDirMask = direction & (RouteTerminal.DIR_LEFT | RouteTerminal.DIR_RIGHT);
 605             int yDirMask = direction & (RouteTerminal.DIR_DOWN | RouteTerminal.DIR_UP);
 606
 607             int xDirMaskRotated = rotl4(xDirMask, xQuadrant);
 608             int yDirMaskRotated = rotl4(yDirMask, yQuadrant-1);
 609
 610             direction = xDirMaskRotated | yDirMaskRotated;
 611         }
 612
 613         return direction;
 614     }
 615
 616     /**
 617      * 4-bit rotate left without carry operation.
 618      * Operates on the 4 least sensitive bits of the integer
 619      * and leaves the higher bits untouched.
 620      * @param x the bits to rotate
 621      * @param n the amount of rotation [0..3]
 622      * @return
 623      */
 624     private static int rotl4(int x, int n) {
 625         n &= 3;
 626         if (n == 0)
 627             return x;
 628         int hx = x & 0xfffffff0;
 629         int lx = x & 0xf;
 630         int xh = (lx << n) & 0xf;
 631         int xl = (lx >>> (4-n));
 632         return xh | xl | hx;
 633     }
 634
 635         /**
 636      * <pre>
 637      *  33
 638      * 2\/0
 639      * 2/\0
 640      *  11
 641      * </pre>
 642      *
 643      * @param theta angle in radians
 644      * @return the quadrant based on the ASCII art above
 645      */
 646     private static int mainQuadrant(double theta) {
 647         if (theta > -DEG_45 && theta <= DEG_45) {
 648             return 0;
 649         } else if ((theta > DEG_45 && theta <= DEG_135)) {
 650             return 1;
 651         } else if (theta >= -DEG_135 && theta < -DEG_45) {
 652             return 3;
 653         }
 654         return 2;
 655     }
 656
 657     private static final double DEG_45 = Math.PI/4.;
 658     private static final double DEG_135 = Math.PI*3./4.;
 659
 660     public static class BackendConnection {
 661         public final Resource node;
 662         public final Resource terminal;
 663         public final EdgeEnd  end;
 664         public final int hash;
 665         public BackendConnection(EdgeEnd end, Resource node, Resource terminal) {
 666             assert end != null;
 667             assert node != null;
 668             assert terminal != null;
 669             this.end = end;
 670             this.node = node;
 671             this.terminal = terminal;
 672             this.hash = makeHash();
 673         }
 674         @Override
 675         public boolean equals(Object obj) {
 676             if (this == obj)
 677                 return true;
 678             if (!(obj instanceof Connection))
 679                 return false;
 680             Connection other = (Connection) obj;
 681             return other.terminal == terminal
 682                     && other.node == node
 683                     && other.end == end;
 684         }
 685         private int makeHash() {
 686             final int prime = 31;
 687             int result = 1;
 688             result = prime * result + end.hashCode();
 689             result = prime * result + ((node == null) ? 0 : node.hashCode());
 690             result = prime * result + ((terminal == null) ? 0 : terminal.hashCode());
 691             return result;
 692         }
 693         @Override
 694         public int hashCode() {
 695             return hash;
 696         }
 697         @Override
 698         public String toString() {
 699             return "BackendConnection[node=" + node + ", terminal=" + terminal + ", end=" + end + "]";
 700         }
 701     }
 702
 703 }