svgencoder.java

jCharts是一个100％基于Java的制图工具

/***********************************************************************************************
 * File Info: $Id: SVGEncoder.java,v 1.6 2003/03/14 03:22:41 nathaniel_auvil Exp $
 * Copyright (C) 2002
 * Author: Nathaniel G. Auvil
 * Contributor(s):
 *
 * 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 [e-mail]
 *
 * 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.jCharts.encoders;


import org.apache.batik.dom.GenericDOMImplementation;
import org.apache.batik.svggen.SVGGraphics2D;
import org.jCharts.Chart;
import org.jCharts.chartData.ChartDataException;
import org.jCharts.imageMap.ImageMapNotSupportedException;
import org.jCharts.properties.PropertyException;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;

import java.io.*;


/********************************************************************************************
 * This class REQUIRES the Apache XML Batik libraries to run.
 *
 **********************************************************************************************/
public final class SVGEncoder
{

	/******************************************************************************************
	 *
	 *
	 ******************************************************************************************/
	private SVGEncoder() throws Exception
	{
		throw new Exception( "No need to create an instance of this class!" );
	}


	/******************************************************************************************
	 * Encodes the Chart to an OutputStream which can be a file or any other OutputStream
	 * implementation.
	 *
	 * @param chart
	 * @param outputStream
	 * @throws ChartDataException
	 * @throws PropertyException
	 * @throws IOException
	 *******************************************************************************************/
	public static final void encode( Chart chart, OutputStream outputStream ) throws ChartDataException, PropertyException, IOException
	{
		//---hopefully eliminate support requests asking about this...
		if( chart.getImageMap() != null )
		{
			throw new ImageMapNotSupportedException( "HTML client-side image maps are not supported by the SVG format." );
		}

		//---Get a DOMImplementation
		DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();

		//---Create an instance of org.w3c.dom.Document
		Document document = domImpl.createDocument( null, "svg", null );

		//---Create an instance of the SVG Generator
		SVGGraphics2D svgGenerator = new SVGGraphics2D( document );

		chart.setGraphics2D( svgGenerator );
		chart.render();

		Writer writer = new OutputStreamWriter( outputStream, "UTF-8" );
		svgGenerator.stream( writer, false );

		writer.flush();
		writer.close();
	}
}