bundles/org.simantics.g2d/src/org/simantics/g2d/multileveldiagram/ZoomTransitionParticipant.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.g2d.multileveldiagram;\r
  13 \r
  14 import java.awt.geom.AffineTransform;\r
  15 import java.util.List;\r
  16 \r
  17 import org.simantics.g2d.canvas.Hints;\r
  18 import org.simantics.g2d.canvas.ICanvasContext;\r
  19 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;\r
  20 import org.simantics.g2d.canvas.impl.HintReflection.HintListener;\r
  21 import org.simantics.g2d.diagram.DiagramHints;\r
  22 import org.simantics.g2d.diagram.IDiagram;\r
  23 import org.simantics.g2d.diagram.impl.Diagram;\r
  24 import org.simantics.g2d.diagram.participant.AbstractDiagramParticipant;\r
  25 import org.simantics.g2d.multileveldiagram.LayerComposition.LayerInfo;\r
  26 import org.simantics.g2d.participant.TransformUtil;\r
  27 import org.simantics.g2d.utils.GeometryUtils;\r
  28 import org.simantics.utils.datastructures.hints.IHintListener;\r
  29 import org.simantics.utils.datastructures.hints.IHintObservable;\r
  30 import org.simantics.utils.datastructures.hints.IHintContext.Key;\r
  31 \r
  32 /**\r
  33  * This participant changes the diagram according to zoom level.\r
  34  * \r
  35  * @author Toni Kalajainen\r
  36  */\r
  37 public class ZoomTransitionParticipant extends AbstractDiagramParticipant {\r
  38 \r
  39     @Dependency TransformUtil util;\r
  40 \r
  41     /** Set dirty if transform changes */\r
  42     @HintListener(Class=Hints.class, Field="KEY_CANVAS_TRANSFORM")\r
  43     public void transformChanged(\r
  44             IHintObservable sender,\r
  45             Key key,\r
  46             Object oldValue,\r
  47             Object newValue)\r
  48     {\r
  49         if (composition==null) return;\r
  50         if (newValue==null) return;\r
  51         AffineTransform at = (AffineTransform) newValue;\r
  52         _setZoom(at);\r
  53     }\r
  54 \r
  55     IHintListener compositeHintListener = new IHintListener() {\r
  56         @Override\r
  57         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {\r
  58             composition = (List<LayerInfo>) newValue;\r
  59             AffineTransform at = util.getTransform();\r
  60             _setZoom(at);\r
  61         }\r
  62 \r
  63         @Override\r
  64         public void hintRemoved(IHintObservable sender, Key key, Object oldValue) {\r
  65             composition = null;\r
  66         }};\r
  67 \r
  68         List<LayerInfo> composition;\r
  69         TransitionFunction function;\r
  70 \r
  71         public ZoomTransitionParticipant(TransitionFunction function) {\r
  72             super();\r
  73             this.function = function;\r
  74         }\r
  75 \r
  76         @Override\r
  77         public void addedToContext(ICanvasContext ctx) {\r
  78             AffineTransform at = ctx.getHintStack().getHint(Hints.KEY_CANVAS_TRANSFORM);\r
  79             _setZoom(at);\r
  80             super.addedToContext(ctx);\r
  81         }\r
  82 \r
  83 \r
  84         @Override\r
  85         protected void onDiagramSet(IDiagram newDiagram, IDiagram oldDiagram) {\r
  86             if (newDiagram==oldDiagram) return;\r
  87             if (oldDiagram!=null && newDiagram==null && composition!=null&& oldDiagram.getHint(DiagramHints.KEY_LAYER_COMPOSITION)==composition) {\r
  88                 composition = null;\r
  89                 oldDiagram.removeKeyHintListener(DiagramHints.KEY_LAYER_COMPOSITION, compositeHintListener);\r
  90             }\r
  91             if (newDiagram!=null && composition==null && newDiagram.getHint(DiagramHints.KEY_LAYER_COMPOSITION)!=null) {\r
  92                 newDiagram.addKeyHintListener(DiagramHints.KEY_LAYER_COMPOSITION, compositeHintListener);\r
  93                 composition = newDiagram.getHint(DiagramHints.KEY_LAYER_COMPOSITION);\r
  94             }\r
  95             if (newDiagram != null && util!=null)\r
  96                 _setZoom(util.getTransform());\r
  97         }\r
  98 \r
  99         private void _setDiagramAndPhase(IDiagram d, Double newPhase)\r
 100         {\r
 101             Double oldPhase = diagram.getHint(TransitionDiagram.KEY_PHASE);\r
 102             IDiagram currentDiagram = diagram;\r
 103             IDiagram nextDiagram = d;\r
 104             if (currentDiagram!=nextDiagram) {\r
 105                 setHint(DiagramHints.KEY_DIAGRAM, nextDiagram);\r
 106                 System.out.println("Switching to "+nextDiagram);\r
 107                 setDirty();\r
 108             }\r
 109             if (newPhase!=null) {\r
 110                 diagram.setHint(TransitionDiagram.KEY_PHASE, newPhase);\r
 111                 setDirty();\r
 112             } else if (oldPhase!=null) {\r
 113                 diagram.removeHint(TransitionDiagram.KEY_PHASE);\r
 114                 setDirty();\r
 115             }\r
 116         }\r
 117 \r
 118         private void _setZoom(double zoomLevel) {\r
 119             if (composition==null) return;\r
 120             IDiagram d = Diagram.EMPTY_DIAGRAM;\r
 121             double phase = 0.0;\r
 122             for (int i=0; i<composition.size(); i++)\r
 123             {\r
 124                 LayerInfo li = composition.get(i);\r
 125                 if (li.ll>=zoomLevel && li.ul<=zoomLevel)\r
 126                 {\r
 127                     d = li.diagram;\r
 128                     phase = (zoomLevel - li.ul) / (li.ll - li.ul);\r
 129                     phase = function.f(phase);\r
 130                     phase = Math.min(phase, 1);\r
 131                     phase = Math.max(phase, 0);\r
 132                     break;\r
 133                 }\r
 134             }\r
 135             _setDiagramAndPhase(d, phase);\r
 136         }\r
 137 \r
 138         private void _setZoom(AffineTransform at) {\r
 139             if (diagram==null) return;\r
 140             if (at==null) {\r
 141                 _setZoom(1.0);\r
 142                 return;\r
 143             }\r
 144             double scale = GeometryUtils.getScale(at);\r
 145             _setZoom(scale);\r
 146         }\r
 147 \r
 148 }\r