edu.uci.ics.jung.visualization.control.SatelliteShearingGraphMousePlugin Maven / Gradle / Ivy

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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 edu.uci.ics.jung.visualization.MultiLayerTransformer.Layer;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.transform.MutableTransformer;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.geom.Point2D;

/**
 * Overrides ShearingGraphMousePlugin so that mouse events in the satellite view cause shearing of
 * the main view
 *
 * @see ShearingGraphMousePlugin
 * @author Tom Nelson
 */
public class SatelliteShearingGraphMousePlugin extends ShearingGraphMousePlugin {

  public SatelliteShearingGraphMousePlugin() {
    super();
  }

  public SatelliteShearingGraphMousePlugin(int modifiers) {
    super(modifiers);
  }

  /** overridden to shear the main view */
  public void mouseDragged(MouseEvent e) {
    if (down == null) {
      return;
    }
    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);
        Point2D q = down;
        Point2D p = e.getPoint();
        float dx = (float) (p.getX() - q.getX());
        float dy = (float) (p.getY() - q.getY());

        Dimension d = vv.getSize();
        float shx = 2.f * dx / d.height;
        float shy = 2.f * dy / d.width;
        // I want to compute shear based on the view coordinates of the
        // lens center in the satellite view.
        // translate the master view center to layout coords, then translate
        // that point to the satellite view's view coordinate system....
        Point2D center =
            vv.getRenderContext()
                .getMultiLayerTransformer()
                .transform(
                    vvMaster
                        .getRenderContext()
                        .getMultiLayerTransformer()
                        .inverseTransform(vvMaster.getCenter()));
        if (p.getX() < center.getX()) {
          shy = -shy;
        }
        if (p.getY() < center.getY()) {
          shx = -shx;
        }
        modelTransformerMaster.shear(-shx, -shy, vvMaster.getCenter());

        down.x = e.getX();
        down.y = e.getY();
      }
      e.consume();
    }
  }
}