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<HTML><BODY BGCOLOR="white"><PRE><FONT color="green">001</FONT> /* ===========================================================<a name="line.1"></a><FONT color="green">002</FONT> * JFreeChart : a free chart library for the Java(tm) platform<a name="line.2"></a><FONT color="green">003</FONT> * ===========================================================<a name="line.3"></a><FONT color="green">004</FONT> *<a name="line.4"></a><FONT color="green">005</FONT> * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.<a name="line.5"></a><FONT color="green">006</FONT> *<a name="line.6"></a><FONT color="green">007</FONT> * Project Info: http://www.jfree.org/jfreechart/index.html<a name="line.7"></a><FONT color="green">008</FONT> *<a name="line.8"></a><FONT color="green">009</FONT> * This library is free software; you can redistribute it and/or modify it <a name="line.9"></a><FONT color="green">010</FONT> * under the terms of the GNU Lesser General Public License as published by <a name="line.10"></a><FONT color="green">011</FONT> * the Free Software Foundation; either version 2.1 of the License, or <a name="line.11"></a><FONT color="green">012</FONT> * (at your option) any later version.<a name="line.12"></a><FONT color="green">013</FONT> *<a name="line.13"></a><FONT color="green">014</FONT> * This library is distributed in the hope that it will be useful, but <a name="line.14"></a><FONT color="green">015</FONT> * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY <a name="line.15"></a><FONT color="green">016</FONT> * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public <a name="line.16"></a><FONT color="green">017</FONT> * License for more details.<a name="line.17"></a><FONT color="green">018</FONT> *<a name="line.18"></a><FONT color="green">019</FONT> * You should have received a copy of the GNU Lesser General Public<a name="line.19"></a><FONT color="green">020</FONT> * License along with this library; if not, write to the Free Software<a name="line.20"></a><FONT color="green">021</FONT> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, <a name="line.21"></a><FONT color="green">022</FONT> * USA. <a name="line.22"></a><FONT color="green">023</FONT> *<a name="line.23"></a><FONT color="green">024</FONT> * [Java is a trademark or registered trademark of Sun Microsystems, Inc. <a name="line.24"></a><FONT color="green">025</FONT> * in the United States and other countries.]<a name="line.25"></a><FONT color="green">026</FONT> *<a name="line.26"></a><FONT color="green">027</FONT> * -------------------<a name="line.27"></a><FONT color="green">028</FONT> * ChartUtilities.java<a name="line.28"></a><FONT color="green">029</FONT> * -------------------<a name="line.29"></a><FONT color="green">030</FONT> * (C) Copyright 2001-2005, by Object Refinery Limited and Contributors.<a name="line.30"></a><FONT color="green">031</FONT> *<a name="line.31"></a><FONT color="green">032</FONT> * Original Author: David Gilbert (for Object Refinery Limited);<a name="line.32"></a><FONT color="green">033</FONT> * Contributor(s): Wolfgang Irler;<a name="line.33"></a><FONT color="green">034</FONT> * Richard Atkinson;<a name="line.34"></a><FONT color="green">035</FONT> * Xavier Poinsard;<a name="line.35"></a><FONT color="green">036</FONT> *<a name="line.36"></a><FONT color="green">037</FONT> * $Id: ChartUtilities.java,v 1.4.2.1 2005/10/25 16:50:20 mungady Exp $<a name="line.37"></a><FONT color="green">038</FONT> *<a name="line.38"></a><FONT color="green">039</FONT> * Changes<a name="line.39"></a><FONT color="green">040</FONT> * -------<a name="line.40"></a><FONT color="green">041</FONT> * 11-Dec-2001 : Version 1. The JPEG method comes from Wolfgang Irler's <a name="line.41"></a><FONT color="green">042</FONT> * JFreeChartServletDemo class (DG);<a name="line.42"></a><FONT color="green">043</FONT> * 23-Jan-2002 : Changed saveChartAsXXX() methods to pass IOExceptions back to <a name="line.43"></a><FONT color="green">044</FONT> * caller (DG);<a name="line.44"></a><FONT color="green">045</FONT> * 26-Jun-2002 : Added image map methods (DG);<a name="line.45"></a><FONT color="green">046</FONT> * 05-Aug-2002 : Added writeBufferedImage methods<a name="line.46"></a><FONT color="green">047</FONT> * Modified writeImageMap method to support flexible image <a name="line.47"></a><FONT color="green">048</FONT> * maps (RA);<a name="line.48"></a><FONT color="green">049</FONT> * 26-Aug-2002 : Added saveChartAsJPEG and writeChartAsJPEG methods with info <a name="line.49"></a><FONT color="green">050</FONT> * objects (RA);<a name="line.50"></a><FONT color="green">051</FONT> * 05-Sep-2002 : Added writeImageMap() method to support OverLIB<a name="line.51"></a><FONT color="green">052</FONT> * - http://www.bosrup.com/web/overlib (RA);<a name="line.52"></a><FONT color="green">053</FONT> * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);<a name="line.53"></a><FONT color="green">054</FONT> * 17-Oct-2002 : Exposed JPEG quality setting and PNG compression level as <a name="line.54"></a><FONT color="green">055</FONT> * parameters (DG);<a name="line.55"></a><FONT color="green">056</FONT> * 25-Oct-2002 : Fixed writeChartAsJPEG() empty method bug (DG);<a name="line.56"></a><FONT color="green">057</FONT> * 13-Mar-2003 : Updated writeImageMap method as suggested by Xavier Poinsard <a name="line.57"></a><FONT color="green">058</FONT> * (see Feature Request 688079) (DG);<a name="line.58"></a><FONT color="green">059</FONT> * 12-Aug-2003 : Added support for custom image maps using <a name="line.59"></a><FONT color="green">060</FONT> * ToolTipTagFragmentGenerator and URLTagFragmentGenerator (RA);<a name="line.60"></a><FONT color="green">061</FONT> * 02-Sep-2003 : Separated PNG encoding from writing chart to an <a name="line.61"></a><FONT color="green">062</FONT> * OutputStream (RA);<a name="line.62"></a><FONT color="green">063</FONT> * 04-Dec-2003 : Chart draw() method modified to include anchor point (DG);<a name="line.63"></a><FONT color="green">064</FONT> * 20-Feb-2004 : Edited Javadocs and added argument checking (DG);<a name="line.64"></a><FONT color="green">065</FONT> * 05-Apr-2004 : Fixed problem with buffered image type (DG);<a name="line.65"></a><FONT color="green">066</FONT> * 01-Aug-2004 : Modified to use EncoderUtil for all image encoding (RA);<a name="line.66"></a><FONT color="green">067</FONT> * 02-Aug-2004 : Delegated image map related functionality to ImageMapUtil (RA);<a name="line.67"></a><FONT color="green">068</FONT> * 13-Jan-2005 : Renamed ImageMapUtil --> ImageMapUtilities, removed method<a name="line.68"></a><FONT color="green">069</FONT> * writeImageMap(PrintWriter, String, ChartRenderingInfo) which <a name="line.69"></a><FONT color="green">070</FONT> * exists in ImageMapUtilities (DG);<a name="line.70"></a><FONT color="green">071</FONT> *<a name="line.71"></a><FONT color="green">072</FONT> */<a name="line.72"></a><FONT color="green">073</FONT> <a name="line.73"></a><FONT color="green">074</FONT> package org.jfree.chart;<a name="line.74"></a><FONT color="green">075</FONT> <a name="line.75"></a><FONT color="green">076</FONT> import java.awt.Graphics2D;<a name="line.76"></a><FONT color="green">077</FONT> import java.awt.geom.AffineTransform;<a name="line.77"></a><FONT color="green">078</FONT> import java.awt.geom.Rectangle2D;<a name="line.78"></a><FONT color="green">079</FONT> import java.awt.image.BufferedImage;<a name="line.79"></a><FONT color="green">080</FONT> import java.io.BufferedOutputStream;<a name="line.80"></a><FONT color="green">081</FONT> import java.io.File;<a name="line.81"></a><FONT color="green">082</FONT> import java.io.FileOutputStream;<a name="line.82"></a><FONT color="green">083</FONT> import java.io.IOException;<a name="line.83"></a><FONT color="green">084</FONT> import java.io.OutputStream;<a name="line.84"></a><FONT color="green">085</FONT> import java.io.PrintWriter;<a name="line.85"></a><FONT color="green">086</FONT> <a name="line.86"></a><FONT color="green">087</FONT> import org.jfree.chart.imagemap.ImageMapUtilities;<a name="line.87"></a><FONT color="green">088</FONT> import org.jfree.chart.imagemap.OverLIBToolTipTagFragmentGenerator;<a name="line.88"></a><FONT color="green">089</FONT> import org.jfree.chart.imagemap.StandardToolTipTagFragmentGenerator;<a name="line.89"></a><FONT color="green">090</FONT> import org.jfree.chart.imagemap.StandardURLTagFragmentGenerator;<a name="line.90"></a><FONT color="green">091</FONT> import org.jfree.chart.imagemap.ToolTipTagFragmentGenerator;<a name="line.91"></a><FONT color="green">092</FONT> import org.jfree.chart.imagemap.URLTagFragmentGenerator;<a name="line.92"></a><FONT color="green">093</FONT> <a name="line.93"></a><FONT color="green">094</FONT> import org.jfree.chart.encoders.EncoderUtil;<a name="line.94"></a><FONT color="green">095</FONT> import org.jfree.chart.encoders.ImageFormat;<a name="line.95"></a><FONT color="green">096</FONT> <a name="line.96"></a><FONT color="green">097</FONT> /**<a name="line.97"></a><FONT color="green">098</FONT> * A collection of utility methods for JFreeChart. Includes methods for <a name="line.98"></a><FONT color="green">099</FONT> * converting charts to image formats (PNG and JPEG) plus creating simple HTML <a name="line.99"></a><FONT color="green">100</FONT> * image maps.<a name="line.100"></a><FONT color="green">101</FONT> */<a name="line.101"></a><FONT color="green">102</FONT> public abstract class ChartUtilities {<a name="line.102"></a><FONT color="green">103</FONT> <a name="line.103"></a><FONT color="green">104</FONT> /**<a name="line.104"></a><FONT color="green">105</FONT> * Writes a chart to an output stream in PNG format.<a name="line.105"></a><FONT color="green">106</FONT> *<a name="line.106"></a><FONT color="green">107</FONT> * @param out the output stream (<code>null</code> not permitted).<a name="line.107"></a><FONT color="green">108</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.108"></a><FONT color="green">109</FONT> * @param width the image width.<a name="line.109"></a><FONT color="green">110</FONT> * @param height the image height.<a name="line.110"></a><FONT color="green">111</FONT> *<a name="line.111"></a><FONT color="green">112</FONT> * @throws IOException if there are any I/O errors.<a name="line.112"></a><FONT color="green">113</FONT> */<a name="line.113"></a><FONT color="green">114</FONT> public static void writeChartAsPNG(OutputStream out,<a name="line.114"></a><FONT color="green">115</FONT> JFreeChart chart,<a name="line.115"></a><FONT color="green">116</FONT> int width,<a name="line.116"></a><FONT color="green">117</FONT> int height) throws IOException {<a name="line.117"></a><FONT color="green">118</FONT> <a name="line.118"></a><FONT color="green">119</FONT> // defer argument checking...<a name="line.119"></a><FONT color="green">120</FONT> writeChartAsPNG(out, chart, width, height, null);<a name="line.120"></a><FONT color="green">121</FONT> <a name="line.121"></a><FONT color="green">122</FONT> }<a name="line.122"></a><FONT color="green">123</FONT> <a name="line.123"></a><FONT color="green">124</FONT> /**<a name="line.124"></a><FONT color="green">125</FONT> * Writes a chart to an output stream in PNG format.<a name="line.125"></a><FONT color="green">126</FONT> *<a name="line.126"></a><FONT color="green">127</FONT> * @param out the output stream (<code>null</code> not permitted).<a name="line.127"></a><FONT color="green">128</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.128"></a><FONT color="green">129</FONT> * @param width the image width.<a name="line.129"></a><FONT color="green">130</FONT> * @param height the image height.<a name="line.130"></a><FONT color="green">131</FONT> * @param encodeAlpha encode alpha?<a name="line.131"></a><FONT color="green">132</FONT> * @param compression the compression level (0-9).<a name="line.132"></a><FONT color="green">133</FONT> *<a name="line.133"></a>⌨️ 快捷键说明
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