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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Part II. Basic graph creation</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="index.html" title="JpGraph Manual"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Part II. Basic graph creation</th></tr></table><hr></div><div class="part" title="Part II. Basic graph creation"><div class="titlepage"><div><div><h1 class="title"><a name="id2492846"></a>Part II. Basic graph creation</h1></div></div></div>
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<div class="partintro" title="Basic graph creation"><div></div>
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<p>The goal of this part is to introduce some basic concepts that must be known when
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creating graphs with the JpGraph library. It will also serve as a gentle introduction on
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how to structure a basic graph script. </p>
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<p>The challenge of writing a good manual is that it is sometimes necessary to use
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concepts that might not have been fully explained in order to clarify some even more
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basic concept. So if there are parts that you do not fully understand do not despair.
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The remainder of the manual will explain a lot more of the details. </p>
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<div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="chapter"><a href="ch04.html">4. Your first graph script</a></span></dt><dd><dl><dt><span class="sect1"><a href="ch04.html#id2492897">4.1. Some words of caution</a></span></dt><dt><span class="sect1"><a href="ch04s02.html">4.2. Graphing the number of sun spots during the 19th Century</a></span></dt><dd><dl><dt><span class="sect2"><a href="ch04s02.html#id2492934">4.2.1. The historic data</a></span></dt><dt><span class="sect2"><a href="ch04s02.html#sec.preparing-sunspots-data">4.2.2. Preparing the data</a></span></dt><dt><span class="sect2"><a href="ch04s02.html#id2492973">4.2.3. A basic line graph</a></span></dt><dt><span class="sect2"><a href="ch04s02.html#id2493198">4.2.4. A basic bar graph</a></span></dt></dl></dd></dl></dd><dt><span class="chapter"><a href="ch05.html">5. Fundamentals of dynamic graph generation</a></span></dt><dd><dl><dt><span class="sect1"><a href="ch05.html#sec1.making-sense-of-HTTP-streams">5.1. Making sense of HTTP streams and MIME types</a></span></dt><dt><span class="sect1"><a href="ch05s02.html">5.2. What is an image?</a></span></dt><dt><span class="sect1"><a href="ch05s03.html">5.3. Static vs dynamic images</a></span></dt><dt><span class="sect1"><a href="ch05s04.html">5.4. Dynamic images on the command line</a></span></dt><dt><span class="sect1"><a href="ch05s05.html">5.5. How to generate images with JpGraph library</a></span></dt><dd><dl><dt><span class="sect2"><a href="ch05s05.html#id2494467">5.5.1. The standard steps of setting up a graph</a></span></dt><dt><span class="sect2"><a href="ch05s05.html#id2494641">5.5.2. Choosing the image compression format for JpGraph</a></span></dt><dt><span class="sect2"><a href="ch05s05.html#id2494706">5.5.3. Sending back the image to the browser</a></span></dt><dt><span class="sect2"><a href="ch05s05.html#sec2.writing-miage-to-file">5.5.4. Writing the image directly to a file</a></span></dt><dt><span class="sect2"><a href="ch05s05.html#id2494959">5.5.5. Alternatives to streaming or storing the image</a></span></dt><dt><span class="sect2"><a href="ch05s05.html#sec2.forcing-browser-update">5.5.6. Forcing the browser to update your graph</a></span></dt><dt><span class="sect2"><a href="ch05s05.html#id2495089">5.5.7. Printing the generated image</a></span></dt></dl></dd><dt><span class="sect1"><a href="ch05s06.html">5.6. Efficient graph generation using the built-in cache subsystem</a></span></dt></dl></dd><dt><span class="chapter"><a href="ch06.html">6. Error handling</a></span></dt><dd><dl><dt><span class="sect1"><a href="ch06.html#id2495302">6.1. The problem with error messages and images</a></span></dt><dd><dl><dt><span class="sect2"><a href="ch06.html#id2495400">6.1.1. Catching errors in other parts of the system while creating images</a></span></dt></dl></dd><dt><span class="sect1"><a href="ch06s02.html">6.2. Available error messages</a></span></dt><dd><dl><dt><span class="sect2"><a href="ch06s02.html#sec2.localizing-errmsg">6.2.1. Localizing error messages</a></span></dt><dt><span class="sect2"><a href="ch06s02.html#id2495515">6.2.2. Error messages on a production server</a></span></dt></dl></dd><dt><span class="sect1"><a href="ch06s03.html">6.3. Using PHP Exceptions</a></span></dt><dd><dl><dt><span class="sect2"><a href="ch06s03.html#id2495896">6.3.1. Selecting between text and image based error handling</a></span></dt><dt><span class="sect2"><a href="ch06s03.html#id2495901">6.3.2. Writing error message to a log file (or system logger)</a></span></dt></dl></dd><dt><span class="sect1"><a href="ch06s04.html">6.4. Adding a new locale</a></span></dt></dl></dd><dt><span class="chapter"><a href="ch07.html">7. Color handling</a></span></dt><dd><dl><dt><span class="sect1"><a href="ch07.html#id2496153">7.1. Specifying colors by name</a></span></dt><dt><span class="sect1"><a href="ch07s02.html">7.2. Specifying colors by RGB triples</a></span></dt><dt><span class="sect1"><a href="ch07s03.html">7.3. Using HTML color specifications</a></span></dt><dt><span class="sect1"><a href="ch07s04.html">7
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