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Java > Open Source Codes > org > krysalis > jcharts > encoders > JPEGEncoder13


1 /***********************************************************************************************
2  * Copyright 2002 (C) Nathaniel G. Auvil. All Rights Reserved.
3  *
4  * Redistribution and use of this software and associated documentation ("Software"), with or
5  * without modification, are permitted provided that the following conditions are met:
6  *
7  * 1. Redistributions of source code must retain copyright statements and notices.
8  * Redistributions must also contain a copy of this document.
9  *
10  * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
11  * conditions and the following disclaimer in the documentation and/or other materials
12  * provided with the distribution.
13  *
14  * 3. The name "jCharts" or "Nathaniel G. Auvil" must not be used to endorse or promote
15  * products derived from this Software without prior written permission of Nathaniel G.
16  * Auvil. For written permission, please contact nathaniel_auvil@users.sourceforge.net
17  *
18  * 4. Products derived from this Software may not be called "jCharts" nor may "jCharts" appear
19  * in their names without prior written permission of Nathaniel G. Auvil. jCharts is a
20  * registered trademark of Nathaniel G. Auvil.
21  *
22  * 5. Due credit should be given to the jCharts Project (http://jcharts.sourceforge.net/).
23  *
24  * THIS SOFTWARE IS PROVIDED BY Nathaniel G. Auvil AND CONTRIBUTORS ``AS IS'' AND ANY
25  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
27  * jCharts OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
33  ************************************************************************************************/

34
35 package org.krysalis.jcharts.encoders;
36
37
38 import com.sun.image.codec.jpeg.JPEGCodec;
39 import com.sun.image.codec.jpeg.JPEGEncodeParam;
40 import com.sun.image.codec.jpeg.JPEGImageEncoder;
41 import org.krysalis.jcharts.Chart;
42 import org.krysalis.jcharts.chartData.ChartDataException;
43 import org.krysalis.jcharts.properties.PropertyException;
44
45 import java.awt.image.BufferedImage JavaDoc;
46 import java.awt.image.BufferedImageOp JavaDoc;
47 import java.awt.image.ConvolveOp JavaDoc;
48 import java.awt.image.Kernel JavaDoc;
49 import java.io.IOException JavaDoc;
50 import java.io.OutputStream JavaDoc;
51
52
53 /*************************************************************************************
54  * Provided for backwards compatibility for jdk 1.3
55  *
56  * @author Nathaniel Auvil
57  * @version $Id: JPEGEncoder13.java,v 1.2 2003/05/26 13:40:20 nathaniel_auvil Exp $
58  ************************************************************************************/

59 public class JPEGEncoder13
60 {
61
62     /******************************************************************************************
63      *
64      *
65      ******************************************************************************************/

66     private JPEGEncoder13() throws Exception JavaDoc
67     {
68         throw new Exception JavaDoc( "No need to create an instance of this class!" );
69     }
70
71
72     /******************************************************************************************
73      * Encodes the chart to a JPEG format. If you are generating large dimension images, the file
74      * size can get quite large. You can try decreasing the quality to decrease the file size.
75      *
76      * @param outputStream
77      * @param quality float value from 0.0f(worst image quality) - 1.0f(best image quality)
78      * @throws ChartDataException
79      * @throws PropertyException
80      * @throws IOException
81      *******************************************************************************************/

82     public static void encode( Chart chart,
83                                         float quality,
84                                         OutputStream JavaDoc outputStream ) throws ChartDataException, PropertyException, IOException JavaDoc
85     {
86         BufferedImage JavaDoc bufferedImage = BinaryEncoderUtil.render( chart );
87
88         float[] sharpKernel = {0.0f, -1.0f, 0.0f,
89                                       -1.0f, 5.0f, -1.0f,
90                                       0.0f, -1.0f, 0.0f};
91
92         BufferedImageOp JavaDoc sharpen = new ConvolveOp JavaDoc( new Kernel JavaDoc( 3, 3, sharpKernel ), ConvolveOp.EDGE_NO_OP, null );
93         BufferedImage JavaDoc sharp = sharpen.filter( bufferedImage, null );
94
95         //---create an encoder object for the BufferedImage.
96
JPEGEncodeParam jpegParam = JPEGCodec.getDefaultJPEGEncodeParam( sharp );
97         jpegParam.setQuality( quality, false );
98
99         JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder( outputStream, jpegParam );
100
101         //---encode the BufferedImage.
102
jpeg.encode( bufferedImage );
103
104     }
105 }
106
107
108
109
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