/***********************************************************************************************
* Copyright 2002 (C) Nathaniel G. Auvil. All Rights Reserved.
*
* Redistribution and use of this software and associated documentation ("Software"), with or
* without modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and notices.
* Redistributions must also contain a copy of this document.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 3. The name "jCharts" or "Nathaniel G. Auvil" must not be used to endorse or promote
* products derived from this Software without prior written permission of Nathaniel G.
* Auvil. For written permission, please contact nathaniel_auvil@users.sourceforge.net
*
* 4. Products derived from this Software may not be called "jCharts" nor may "jCharts" appear
* in their names without prior written permission of Nathaniel G. Auvil. jCharts is a
* registered trademark of Nathaniel G. Auvil.
*
* 5. Due credit should be given to the jCharts Project (http://jcharts.sourceforge.net/).
*
* THIS SOFTWARE IS PROVIDED BY Nathaniel G. Auvil AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* jCharts OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
************************************************************************************************/
package org.krysalis.jcharts.encoders;
import org.krysalis.jcharts.Chart;
import org.krysalis.jcharts.chartData.ChartDataException;
import org.krysalis.jcharts.properties.PropertyException;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.stream.ImageOutputStream;
import java.awt.image.BufferedImage;
import java.awt.image.IndexColorModel;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
/*************************************************************************************
* This class REQUIRES the jdk 1.4
*
* @author Nathaniel Auvil
* @version $Id: JPEGEncoder.java,v 1.2 2003/05/26 13:40:20 nathaniel_auvil Exp $
************************************************************************************/
public class JPEGEncoder
{
private static final String JPEG = "jpeg";
static
{
//---do not use a file cache as hurts performance
ImageIO.setUseCache( false );
}
/******************************************************************************************
*
*
******************************************************************************************/
private JPEGEncoder() throws Exception
{
throw new Exception( "No need to create an instance of this class!" );
}
/******************************************************************************************
* Encodes the chart to a JPEG format. If you are generating large dimension images, the file
* size can get quite large. You can try decreasing the quality to decrease the file size.
*
* @param outputStream
* @param quality float value from 0.0f(worst image quality) - 1.0f(best image quality)
* @throws ChartDataException
* @throws PropertyException
* @throws IOException
*******************************************************************************************/
public static void encode( Chart chart,
float quality,
OutputStream outputStream ) throws ChartDataException, PropertyException, IOException
{
BufferedImage bufferedImage = BinaryEncoderUtil.render( chart );
Iterator writers = ImageIO.getImageWritersByFormatName( JPEG );
ImageWriter imageWriter = (ImageWriter) writers.next();
JPEGImageWriteParam params = new JPEGImageWriteParam( null );
params.setCompressionMode( ImageWriteParam.MODE_EXPLICIT );
params.setCompressionQuality( quality );
params.setProgressiveMode( javax.imageio.ImageWriteParam.MODE_DISABLED );
params.setDestinationType( new ImageTypeSpecifier( IndexColorModel.getRGBdefault(),
IndexColorModel.getRGBdefault().createCompatibleSampleModel( 16, 16 ) ) );
ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream( outputStream );
imageWriter.setOutput( imageOutputStream );
imageWriter.write( null, new IIOImage( bufferedImage, null, null ), params );
imageOutputStream.close();
imageWriter.dispose();
}
}