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

   1 package org.simantics.district.network.ui;
   2
   3 import org.simantics.g2d.participant.PanZoomRotateHandler;
   4 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseWheelMovedEvent;
   5 import org.simantics.scenegraph.g2d.nodes.NavigationNode;
   6
   7 public class DistrictPanZoomRotateHandler extends PanZoomRotateHandler {
   8
   9     public DistrictPanZoomRotateHandler() {
  10     }
  11
  12     @Override
  13     protected Class<? extends NavigationNode> getNavigationNodeClass() {
  14         return DistrictNavigationNode.class;
  15     }
  16
  17     public static class DistrictNavigationNode extends NavigationNode {
  18
  19         private static final long serialVersionUID = 5452897272925816875L;
  20
  21         @Override
  22         public Double getZoomInLimit() {
  23             return super.getZoomInLimit();
  24         }
  25
  26         @Override
  27         public Double getZoomOutLimit() {
  28             return super.getZoomOutLimit();
  29         }
  30
  31         @Override
  32         public boolean mouseWheelMoved(MouseWheelMovedEvent me) {
  33             if (navigationEnabled && zoomEnabled) {
  34                 double scroll = Math.min(0.9, -me.wheelRotation / 20.0);
  35                 double z = 1 - scroll;
  36                 double dx = (me.controlPosition.getX() - transform.getTranslateX()) / transform.getScaleX();
  37                 double dy = (me.controlPosition.getY() - transform.getTranslateY()) / transform.getScaleY();
  38                 dx = dx * (1 - z);
  39                 dy = dy * (1 - z);
  40                 double limitedScale = limitScaleFactor(z);
  41                 if (limitedScale != 1.0) {
  42                     translate(dx, dy);
  43                     scale(z, z);
  44                     transformChanged();
  45                     dropQuality();
  46                     repaint();
  47                 }
  48             }
  49             return false;
  50         }
  51
  52     }
  53 }