/*
* #%L
* =====================================================
* _____ _ ____ _ _ _ _
* |_ _|_ __ _ _ ___| |_ / __ \| | | | ___ | | | |
* | | | '__| | | / __| __|/ / _` | |_| |/ __|| |_| |
* | | | | | |_| \__ \ |_| | (_| | _ |\__ \| _ |
* |_| |_| \__,_|___/\__|\ \__,_|_| |_||___/|_| |_|
* \____/
*
* =====================================================
*
* Hochschule Hannover
* (University of Applied Sciences and Arts, Hannover)
* Faculty IV, Dept. of Computer Science
* Ricklinger Stadtweg 118, 30459 Hannover, Germany
*
* Email: trust@f4-i.fh-hannover.de
* Website: http://trust.f4.hs-hannover.de/
*
* This file is part of visitmeta-visualization, version 0.6.0,
* implemented by the Trust@HsH research group at the Hochschule Hannover.
* %%
* Copyright (C) 2012 - 2016 Trust@HsH
* %%
* 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.
* #L%
*/
package de.hshannover.f4.trust.visitmeta.graphDrawer.piccolo2d;
import org.apache.log4j.Logger;
import org.piccolo2d.PCamera;
import org.piccolo2d.PCanvas;
import org.piccolo2d.event.PInputEvent;
import org.piccolo2d.event.PZoomEventHandler;
import de.hshannover.f4.trust.visitmeta.graphDrawer.Piccolo2DPanel;
/**
* EventHandler for mouse wheel zoom in the panel.
*/
public class ZoomEventHandler extends PZoomEventHandler {
private static final Logger LOGGER = Logger.getLogger(ZoomEventHandler.class);
private Piccolo2DPanel mPanel = null;
public ZoomEventHandler(Piccolo2DPanel pPanel) {
super();
mPanel = pPanel;
}
@Override
public void mouseWheelRotated(PInputEvent e) {
LOGGER.trace("Method mouseWheelRotated("
+ e + ") called.");
PCamera vCamera = ((PCanvas) mPanel.getPanel()).getCamera();
double vScale = 1.0
- 0.05
* e.getWheelRotation();
vCamera.localToView(e.getPosition());
vCamera.scaleViewAboutPoint(vScale, e.getPosition().getX(), e.getPosition().getY());
}
}