DoubleClickZoomListener.java

/*******************************************************************************
 * Copyright 2012 Geoscience Australia
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package au.gov.ga.earthsci.worldwind.common.view.orbit;

import gov.nasa.worldwind.WorldWind;
import gov.nasa.worldwind.WorldWindow;
import gov.nasa.worldwind.geom.LatLon;
import gov.nasa.worldwind.geom.Position;
import gov.nasa.worldwind.pick.PickedObject;
import gov.nasa.worldwind.pick.PickedObjectList;
import gov.nasa.worldwind.view.orbit.OrbitView;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

/**
 * Mouse listener that, when the user double-clicks, zooms in by 3x, centering
 * at the latlon that the user clicked on.
 * 
 * @author Michael de Hoog (michael.dehoog@ga.gov.au)
 */
public class DoubleClickZoomListener extends MouseAdapter
{
	private WorldWindow wwd;
	private LatLon latlon;
	private double minElevation;

	public DoubleClickZoomListener(WorldWindow wwd, double minElevation)
	{
		this.wwd = wwd;
		this.minElevation = minElevation;
	}

	@Override
	public void mouseClicked(MouseEvent e)
	{
		if (e.getButton() != MouseEvent.BUTTON1 && e.getButton() != MouseEvent.BUTTON3)
		{
			return;
		}

		if (!(wwd.getView() instanceof OrbitView))
		{
			return;
		}
		OrbitView view = (OrbitView) wwd.getView();

		if (e.getClickCount() % 2 == 1)
		{
			// single click
			latlon = null;

			PickedObjectList pickedObjects = wwd.getObjectsAtCurrentPosition();
			if (pickedObjects == null)
			{
				return;
			}

			PickedObject top = pickedObjects.getTopPickedObject();
			if (top == null || !top.isTerrain())
			{
				return;
			}

			latlon = top.getPosition();
		}
		else
		{
			// double click
			if (latlon != null)
			{
				double zoom = view.getZoom();
				if (zoom > minElevation)
				{
					zoom = Math.max(minElevation, e.getButton() == MouseEvent.BUTTON1 ? zoom / 3 : zoom * 3);
				}
				Position beginCenter = view.getCenterPosition();
				Position endCenter = new Position(latlon, beginCenter.getElevation());

				view.stopMovement();
				view.stopAnimations();

				view.addAnimator(FlyToOrbitViewAnimator.createFlyToOrbitViewAnimator(view, beginCenter, endCenter,
						view.getHeading(), view.getHeading(), view.getPitch(), view.getPitch(), view.getZoom(), zoom,
						1000, WorldWind.ABSOLUTE));
				e.consume();
				wwd.redraw();
				latlon = null;
			}
		}
	}
}