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JFreeChart is a class library, written in Java, for generating charts.
Utilising the Java2D API, it supports a wide range of chart types including
bar charts, pie charts, line charts, XY-plots, time series plots, Sankey charts
and more.
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -------------------------
* SunPNGEncoderAdapter.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.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
/**
* Adapter class for the Sun 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+ and is being run using a JDK 1.4+.
*/
public class SunPNGEncoderAdapter implements ImageEncoder {
/**
* Get the quality of the image encoding (always 0.0).
*
* @return A float representing the quality.
*/
public float getQuality() {
return 0.0f;
}
/**
* Set the quality of the image encoding (not supported in this
* ImageEncoder).
*
* @param quality A float representing the quality.
*/
public void setQuality(float quality) {
// No op
}
/**
* Get whether the encoder should encode alpha transparency (always false).
*
* @return Whether the encoder is encoding alpha transparency.
*/
public boolean isEncodingAlpha() {
return false;
}
/**
* Set whether the encoder should encode alpha transparency (not
* supported in this ImageEncoder).
*
* @param encodingAlpha Whether the encoder should encode alpha
* transparency.
*/
public void setEncodingAlpha(boolean encodingAlpha) {
// No op
}
/**
* 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 {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
encode(bufferedImage, outputStream);
return outputStream.toByteArray();
}
/**
* Encodes an image in PNG format and writes it to an 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.");
}
ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
}
}