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jfreechart example source code file (KeypointPNGEncoderAdapter.java)

This example jfreechart source code file (KeypointPNGEncoderAdapter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, illegalargumentexception, illegalargumentexception, image, imageencoder, io, ioexception, ioexception, keypointpngencoderadapter, null, null, outputstream, pngencoder, pngencoder

The jfreechart KeypointPNGEncoderAdapter.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------------------------
 * KeypointPNGEncoderAdapter.java
 * ------------------------------
 * (C) Copyright 2004-2008, by Richard Atkinson and Contributors.
 *
 * Original Author:  Richard Atkinson;
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 01-Aug-2004 : Initial version (RA);
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 *
 */

package org.jfree.chart.encoders;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;

import com.keypoint.PngEncoder;

/**
 * Adapter class for the Keypoint PNG Encoder.  The ImageEncoderFactory will
 * only return a reference to this class by default if the library has been
 * compiled under a JDK < 1.4 or is being run using a JDK < 1.4.
 */
public class KeypointPNGEncoderAdapter implements ImageEncoder {

    /** The quality setting. */
    private int quality = 9;

    /** Encode alpha? */
    private boolean encodingAlpha = false;

    /**
     * Get the quality of the image encoding.  The underlying encoder uses int
     * values:  0 for no compression, and values 1 through 9 for various levels
     * of compression (1 is best speed, 9 is best compression).
     *
     * @return A float representing the quality.
     */
    public float getQuality() {
        return this.quality;
    }

    /**
     * Set the quality of the image encoding (supported).  The underlying
     * encoder uses int values:  0 for no compression, and values 1 through 9
     * for various levels of compression (1 is best speed, 9 is best
     * compression).
     *
     * @param quality  A float representing the quality.
     */
    public void setQuality(float quality) {
        this.quality = (int) quality;
    }

    /**
     * Get whether the encoder should encode alpha transparency.
     *
     * @return Whether the encoder is encoding alpha transparency.
     */
    public boolean isEncodingAlpha() {
        return this.encodingAlpha;
    }

    /**
     * Set whether the encoder should encode alpha transparency (supported).
     *
     * @param encodingAlpha  Whether the encoder should encode alpha
     *                       transparency.
     */
    public void setEncodingAlpha(boolean encodingAlpha) {
        this.encodingAlpha = encodingAlpha;
    }

    /**
     * Encodes an image in PNG format.
     *
     * @param bufferedImage  The image to be encoded.
     * @return The byte[] that is the encoded image.
     * @throws IOException
     */
    public byte[] encode(BufferedImage bufferedImage) throws IOException {
        if (bufferedImage == null) {
            throw new IllegalArgumentException("Null 'image' argument.");
        }
        PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
                0, this.quality);
        return encoder.pngEncode();
    }

    /**
     * Encodes an image in PNG format and writes it to an
     * <code>OutputStream.
     *
     * @param bufferedImage  The image to be encoded.
     * @param outputStream  The OutputStream to write the encoded image to.
     * @throws IOException
     */
    public void encode(BufferedImage bufferedImage, OutputStream outputStream)
        throws IOException {
        if (bufferedImage == null) {
            throw new IllegalArgumentException("Null 'image' argument.");
        }
        if (outputStream == null) {
            throw new IllegalArgumentException("Null 'outputStream' argument.");
        }
        PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
                0, this.quality);
        outputStream.write(encoder.pngEncode());
    }

}

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