/* Copyright (c) 2001, 2003 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.vfny.geoserver.wms.responses;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import org.vfny.geoserver.ServiceException;
import org.vfny.geoserver.wms.responses.helpers.JAISupport;
import org.vfny.geoserver.wms.responses.map.png.PngEncoder;
import org.vfny.geoserver.wms.responses.map.png.PngEncoderB;
/**
* Producer of legend graphics in all the formats available through JAI.
*
* @author Gabriel Roldan, Axios Engineering
* @version $Id: PNGLegendGraphicProducer.java 3669 2005-07-11 16:19:44Z dblasby $
*/
class PNGLegendGraphicProducer extends DefaultRasterLegendProducer {
/**
* Creates a new JAI based legend producer for creating
* <code>outputFormat</code> type images.
*
* @param outputFormat DOCUMENT ME!
*/
PNGLegendGraphicProducer() {
super();
}
/**
* Encodes the image created by the superclss to the format specified at
* the constructor and sends it to <code>out</code>.
*
* @see org.vfny.geoserver.wms.responses.GetLegendGraphicProducer#writeTo(java.io.OutputStream)
*/
public void writeTo(OutputStream out) throws IOException, ServiceException
{
BufferedImage image = super.getLegendGraphic();
PngEncoderB png = new PngEncoderB( image, PngEncoder.ENCODE_ALPHA, 0, 1 ); // filter (0), and compression (1)
byte[] pngbytes = png.pngEncode();
out.write( pngbytes );
out.flush();
}
/**
* Returns the MIME type in which the legend graphic will be encoded.
*
* @see org.vfny.geoserver.wms.responses.GetLegendGraphicProducer#getContentType()
*/
public String getContentType() throws IllegalStateException {
return "image/png";
}
}