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1
34
35 package org.krysalis.jcharts.encoders;
36
37
38 import org.krysalis.jcharts.Chart;
39 import org.krysalis.jcharts.chartData.ChartDataException;
40 import org.krysalis.jcharts.properties.PropertyException;
41
42 import javax.imageio.IIOImage  ;
43 import javax.imageio.ImageIO ;
44 import javax.imageio.ImageTypeSpecifier ;
45 import javax.imageio.ImageWriteParam ;
46 import javax.imageio.ImageWriter ;
47 import javax.imageio.plugins.jpeg.JPEGImageWriteParam ;
48 import javax.imageio.stream.ImageOutputStream ;
49 import java.awt.image.BufferedImage ;
50 import java.awt.image.IndexColorModel ;
51 import java.io.IOException ;
52 import java.io.OutputStream ;
53 import java.util.Iterator ;
54
55
56
62 public class JPEGEncoder
63 {
64
65
66 private static final String JPEG = "jpeg";
67
68
69 static
70 {
71 ImageIO.setUseCache( false );
73 }
74
75
76
80 private JPEGEncoder() throws Exception
81 {
82 throw new Exception ( "No need to create an instance of this class!" );
83 }
84
85
86
96 public static void encode( Chart chart,
97 float quality,
98 OutputStream outputStream ) throws ChartDataException, PropertyException, IOException
99 {
100 BufferedImage bufferedImage = BinaryEncoderUtil.render( chart );
101
102 Iterator writers = ImageIO.getImageWritersByFormatName( JPEG );
103 ImageWriter imageWriter = (ImageWriter ) writers.next();
104
105 JPEGImageWriteParam params = new JPEGImageWriteParam ( null );
106 params.setCompressionMode( ImageWriteParam.MODE_EXPLICIT );
107 params.setCompressionQuality( quality );
108 params.setProgressiveMode( javax.imageio.ImageWriteParam.MODE_DISABLED );
109 params.setDestinationType( new ImageTypeSpecifier ( IndexColorModel.getRGBdefault(),
110 IndexColorModel.getRGBdefault().createCompatibleSampleModel( 16, 16 ) ) );
111
112 ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream( outputStream );
113 imageWriter.setOutput( imageOutputStream );
114 imageWriter.write( null, new IIOImage ( bufferedImage, null, null ), params );
115
116 imageOutputStream.close();
117
118 imageWriter.dispose();
119 }
120 }
121
122
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