org.simantics.district.network.ui/src/org/simantics/district/network/ui/NetworkDrawingParticipant.java

   1
   2 package org.simantics.district.network.ui;
   3
   4 import java.awt.geom.AffineTransform;
   5 import java.awt.geom.Point2D;
   6 import java.awt.geom.Rectangle2D;
   7 import java.util.ArrayList;
   8 import java.util.Collections;
   9 import java.util.List;
  10
  11 import org.simantics.db.Resource;
  12 import org.simantics.diagram.ui.DiagramModelHints;
  13 import org.simantics.district.network.ui.adapters.DistrictNetworkEdgeElement;
  14 import org.simantics.district.network.ui.adapters.DistrictNetworkVertexElement;
  15 import org.simantics.district.network.ui.nodes.DistrictNetworkVertexNode;
  16 import org.simantics.district.network.ui.nodes.NetworkDrawingNode;
  17 import org.simantics.district.network.ui.participants.DNPickSorter;
  18 import org.simantics.district.network.ui.participants.DynamicVisualisationContributionsParticipant;
  19 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;
  20 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;
  21 import org.simantics.g2d.diagram.IDiagram;
  22 import org.simantics.g2d.diagram.handler.PickContext;
  23 import org.simantics.g2d.diagram.handler.PickRequest;
  24 import org.simantics.g2d.diagram.participant.AbstractDiagramParticipant;
  25 import org.simantics.g2d.element.ElementHints;
  26 import org.simantics.g2d.element.IElement;
  27 import org.simantics.maps.MapScalingTransform;
  28 import org.simantics.scenegraph.INode;
  29 import org.simantics.scenegraph.Node;
  30 import org.simantics.scenegraph.g2d.G2DParentNode;
  31 import org.simantics.scenegraph.utils.GeometryUtils;
  32
  33 public class NetworkDrawingParticipant extends AbstractDiagramParticipant {
  34
  35     public static final String NETWORK_DRAWING_NODE = "networkDrawingNode";
  36
  37     @Dependency
  38     PickContext pick;
  39
  40     private NetworkDrawingNode node;
  41     private DynamicVisualisationContributionsParticipant dynamicVisualisationContributionsParticipant;
  42     private AffineTransform transform;
  43
  44     /**
  45      * Holds the current element for which hover information is shown.
  46      * This exists only to optimize the hover updating procedure.
  47      */
  48     private IElement currentHoverElement;
  49
  50     public NetworkDrawingParticipant(DynamicVisualisationContributionsParticipant dynamicVisualisationContributionsParticipant, AffineTransform transform) {
  51         this.dynamicVisualisationContributionsParticipant = dynamicVisualisationContributionsParticipant;
  52         this.transform = transform;
  53     }
  54
  55     @SGInit
  56     public void initSG(G2DParentNode parent) {
  57         node = parent.addNode(NETWORK_DRAWING_NODE, NetworkDrawingNode.class);
  58         node.setTransform(transform);
  59         node.setNetworkDrawingParticipant(this);
  60     }
  61
  62     @Override
  63     protected void onDiagramSet(IDiagram newDiagram, IDiagram oldDiagram) {
  64         node.setDiagram(newDiagram);
  65     }
  66
  67     public boolean pickHoveredElement(Point2D canvasPos, boolean isConnectionTool, AffineTransform viewTransform) {
  68         PickRequest req = new PickRequest(getPickRect(canvasPos, viewTransform)).context(getContext());
  69         List<IElement> pickables = new ArrayList<>();
  70         pick.pick(diagram, req, pickables);
  71
  72         Collections.sort(pickables, DNPickSorter.nearestVerticesFirst(false, DNPickSorter.centerDistSq(canvasPos.getX(), canvasPos.getY())));
  73
  74         updateHoveredElement(pickables, true, isConnectionTool, viewTransform);
  75         // Will repaint once the async hover info calculation is ready, no need to do it here
  76         return false;
  77     }
  78
  79     private boolean updateHoveredElement(List<IElement> elements, boolean hover, boolean isConnectionTool, AffineTransform viewTransform) {
  80         if (elements == null || elements.isEmpty()) {
  81             currentHoverElement = null;
  82             return dynamicVisualisationContributionsParticipant.doHover(false, isConnectionTool);
  83         } else {
  84             dynamicVisualisationContributionsParticipant.doHover(true, isConnectionTool);
  85
  86             // we prefer the first picked element only
  87             IElement elem = elements.get(0);
  88             if (elem.equals(currentHoverElement))
  89                 return false;
  90
  91             INode node = elem.getHint(DistrictNetworkVertexElement.KEY_DN_VERTEX_NODE);
  92             if (node == null)
  93                 node = elem.getHint(DistrictNetworkEdgeElement.KEY_DN_EDGE_NODE);
  94             if (node == null)
  95                 return false;
  96
  97             Resource mapElement = elem.getHint(ElementHints.KEY_OBJECT);
  98             Resource runtimeDiagram = diagram.getHint(DiagramModelHints.KEY_DIAGRAM_RUNTIME_RESOURCE);
  99             currentHoverElement = elem;
 100             dynamicVisualisationContributionsParticipant.hoverNode(runtimeDiagram, mapElement, node, MapScalingTransform.zoomLevel(viewTransform));
 101             return true;
 102         }
 103     }
 104
 105     public boolean isHoveringOverNode(Point2D canvasPos, AffineTransform viewTransform) {
 106         PickRequest req = new PickRequest(getPickRect(canvasPos, viewTransform)).context(getContext());
 107         List<IElement> pickables = new ArrayList<>();
 108         pick.pick(diagram, req, pickables);
 109         for (IElement elem : pickables) {
 110             Node node = elem.getHint(DistrictNetworkVertexElement.KEY_DN_VERTEX_NODE);
 111             if (node instanceof DistrictNetworkVertexNode) {
 112                 return true;
 113             }
 114         }
 115         return false;
 116     }
 117
 118     private Rectangle2D getPickRect(Point2D canvasPos, AffineTransform viewTransform) {
 119         double pixelScale = 1.0 / GeometryUtils.getScale(viewTransform);
 120         if (Double.isInfinite(pixelScale))
 121             pixelScale = 1e-8;
 122
 123         Rectangle2D pickRect = GeometryUtils.expandRectangle(
 124                 new Rectangle2D.Double(canvasPos.getX(), canvasPos.getY(), 0, 0),
 125                 pixelScale * 4);
 126
 127         return pickRect;
 128     }
 129
 130     public AffineTransform getTransform() {
 131         return transform;
 132     }
 133
 134 }