/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2007-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.renderer3d.navigationgestures;
import com.jme.math.Vector3f;
import com.jme.renderer.Camera;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
/**
* Implements a panning gesture for the 3D renderer.
* <p/>
* Pan / move across map with left mouse button drag (will actually move camera along the left/right,
* up/down axes of the camera). (A single left mouse button click will select / click on an item on map).
* The drag has some inertia, so a quick drag will move the camera faster than a slow one.
* The camera is kept above the ground level at all times though.
* <p/>
* Also scale pan amount by altitude.
*
* @author Hans H�ggstr�m
*/
public final class PanGesture
extends AbstractDragGesture
{
//======================================================================
// Private Constants
private static final float DEFAULT_PAN_SENSITIVITY = 0.1f;
//======================================================================
// Public Methods
//----------------------------------------------------------------------
// Constructors
public PanGesture()
{
super( DEFAULT_PAN_SENSITIVITY, MouseEvent.BUTTON3, InputEvent.BUTTON3_DOWN_MASK );
}
//======================================================================
// Protected Methods
protected void applyDragGesture( final Camera camera, final float deltaX, final float deltaY )
{
final float altitudeFactor = getAltitudeFactor();
// TODO: Add inertia and acceleration
// TODO: Add ground collision detection and keep the camera above ground.
final Vector3f newLocation = new Vector3f( camera.getLocation() );
newLocation.scaleAdd( -deltaX * altitudeFactor, camera.getLeft(), newLocation );
newLocation.scaleAdd( -deltaY * altitudeFactor, camera.getUp(), newLocation );
camera.setLocation( newLocation );
}
}