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Core visualization support for the JUNG project

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/*
 * Copyright (c) 2005, The JUNG Authors
 * All rights reserved.
 *
 * This software is open-source under the BSD license; see either "license.txt"
 * or https://github.com/jrtom/jung/blob/master/LICENSE for a description.
 *
 * Created on Aug 15, 2005
 */

package edu.uci.ics.jung.visualization.control;

import java.awt.Cursor;
import java.awt.event.MouseEvent;
import java.awt.geom.Point2D;

import edu.uci.ics.jung.visualization.Layer;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.transform.MutableTransformer;

/**
 * Overrides TranslatingGraphMousePlugin so that mouse events in
 * the satellite view cause translating of the main view
 * 
 * @see TranslatingGraphMousePlugin
 * @author Tom Nelson 
 *
 */
public class SatelliteTranslatingGraphMousePlugin extends
        TranslatingGraphMousePlugin {

    public SatelliteTranslatingGraphMousePlugin() {
        super();
    }

    public SatelliteTranslatingGraphMousePlugin(int modifiers) {
        super(modifiers);
    }
    
    /**
     * Check the modifiers. If accepted, translate the main view according
     * to the dragging of the mouse pointer in the satellite view
     * @param e the event
     */
    public void mouseDragged(MouseEvent e) {
        VisualizationViewer vv = (VisualizationViewer)e.getSource();
        boolean accepted = checkModifiers(e);
        if(accepted) {
            if(vv instanceof SatelliteVisualizationViewer) {
                VisualizationViewer vvMaster = 
                    ((SatelliteVisualizationViewer)vv).getMaster();
                
                MutableTransformer modelTransformerMaster = 
                	vvMaster.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT);
                vv.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
                try {
                    Point2D q = vv.getRenderContext().getMultiLayerTransformer().inverseTransform(down);
                    Point2D p = vv.getRenderContext().getMultiLayerTransformer().inverseTransform(e.getPoint());
                    float dx = (float) (p.getX()-q.getX());
                    float dy = (float) (p.getY()-q.getY());
                    
                    modelTransformerMaster.translate(-dx, -dy);
                    down.x = e.getX();
                    down.y = e.getY();
                } catch(RuntimeException ex) {
                    System.err.println("down = "+down+", e = "+e);
                    throw ex;
                }
            }
            e.consume();
        }
    }


}