ChartImageResource.java

/*******************************************************************************
 * Copyright 2013
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universität Darmstadt
 * 
 * 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 de.tudarmstadt.ukp.csniper.webapp.support.wicket;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.apache.wicket.request.resource.DynamicImageResource;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;

public class ChartImageResource
	extends DynamicImageResource
{
	private static final long serialVersionUID = 1L;
	private JFreeChart chart;
	private int width;
	private int height;

	public ChartImageResource(JFreeChart aChart, int aWidth, int aHeight)
	{
		chart = aChart;
		width = aWidth;
		height = aHeight;
	}

	@Override
	protected byte[] getImageData(Attributes aAttributes)
	{
		try {
			ByteArrayOutputStream bos = new ByteArrayOutputStream();
			ChartUtilities.writeChartAsPNG(bos, chart, width, height);
			return bos.toByteArray();
		}
		catch (IOException e) {
			return new byte[0];
		}
	}

}