KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > jfree > chart > encoders > KeypointPNGEncoderAdapter


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jfreechart/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ------------------------------
28  * KeypointPNGEncoderAdapter.java
29  * ------------------------------
30  * (C) Copyright 2004, by Richard Atkinson and Contributors.
31  *
32  * Original Author: Richard Atkinson;
33  * Contributor(s): -;
34  *
35  * $Id: KeypointPNGEncoderAdapter.java,v 1.4.2.2 2005/11/24 11:50:48 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 01-Aug-2004 : Initial version (RA);
40  *
41  */
42
43 package org.jfree.chart.encoders;
44
45 import com.keypoint.PngEncoder;
46
47 import java.awt.image.BufferedImage JavaDoc;
48 import java.io.IOException JavaDoc;
49 import java.io.OutputStream JavaDoc;
50
51 /**
52  * Adapter class for the Keypoint PNG Encoder. The ImageEncoderFactory will
53  * only return a reference to this class by default if the library has been
54  * compiled under a JDK < 1.4 or is being run using a JDK < 1.4.
55  *
56  * @author Richard Atkinson
57  */
58 public class KeypointPNGEncoderAdapter implements ImageEncoder {
59     private int quality = 9;
60     private boolean encodingAlpha = false;
61
62     /**
63      * Get the quality of the image encoding. The underlying encoder uses int
64      * values: 0 for no compression, and values 1 through 9 for various levels
65      * of compression (1 is best speed, 9 is best compression).
66      *
67      * @return A float representing the quality.
68      */
69     public float getQuality() {
70         return this.quality;
71     }
72
73     /**
74      * Set the quality of the image encoding (supported). The underlying
75      * encoder uses int values: 0 for no compression, and values 1 through 9
76      * for various levels of compression (1 is best speed, 9 is best
77      * compression).
78      *
79      * @param quality A float representing the quality.
80      */
81     public void setQuality(float quality) {
82         this.quality = (int) quality;
83     }
84
85     /**
86      * Get whether the encoder should encode alpha transparency.
87      *
88      * @return Whether the encoder is encoding alpha transparency.
89      */
90     public boolean isEncodingAlpha() {
91         return this.encodingAlpha;
92     }
93
94     /**
95      * Set whether the encoder should encode alpha transparency (supported).
96      *
97      * @param encodingAlpha Whether the encoder should encode alpha
98      * transparency.
99      */
100     public void setEncodingAlpha(boolean encodingAlpha) {
101         this.encodingAlpha = encodingAlpha;
102     }
103
104     /**
105      * Encodes an image in PNG format.
106      *
107      * @param bufferedImage The image to be encoded.
108      * @return The byte[] that is the encoded image.
109      * @throws IOException
110      */
111     public byte[] encode(BufferedImage JavaDoc bufferedImage) throws IOException JavaDoc {
112         if (bufferedImage == null) {
113             throw new IllegalArgumentException JavaDoc("Null 'image' argument.");
114         }
115         PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
116                 0, this.quality);
117         return encoder.pngEncode();
118     }
119
120     /**
121      * Encodes an image in PNG format and writes it to an
122      * <code>OutputStream</code>.
123      *
124      * @param bufferedImage The image to be encoded.
125      * @param outputStream The OutputStream to write the encoded image to.
126      * @throws IOException
127      */
128     public void encode(BufferedImage JavaDoc bufferedImage, OutputStream JavaDoc outputStream)
129         throws IOException JavaDoc {
130         if (bufferedImage == null) {
131             throw new IllegalArgumentException JavaDoc("Null 'image' argument.");
132         }
133         if (outputStream == null) {
134             throw new IllegalArgumentException JavaDoc("Null 'outputStream' argument.");
135         }
136         PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
137                 0, this.quality);
138         outputStream.write(encoder.pngEncode());
139     }
140
141 }
142
Popular Tags