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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><title>Chapter 4. PHPlot Advanced Topics</title><link rel="stylesheet" type="text/css" href="phplotdoc.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="PHPlot Reference Manual" /><link rel="up" href="part1.html" title="Part I. PHPlot Programming" /><link rel="prev" href="conc-errors.html" title="3.9. Error Handling" /><link rel="next" href="adv-serialize.html" title="4.2. PHPlot Object Serialization" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 4. PHPlot Advanced Topics</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="conc-errors.html">Prev</a> </td><th width="60%" align="center">Part I. PHPlot Programming</th><td width="20%" align="right"> <a accesskey="n" href="adv-serialize.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="advanced"></a>Chapter 4. PHPlot Advanced Topics</h2></div></div></div><div class="abstract"><p class="title"><strong></strong></p><p>
This chapter documents advanced PHPlot programming topics, going beyond the
material in <a class="xref" href="concepts.html" title="Chapter 3. PHPlot Concepts">Chapter 3, <em>PHPlot Concepts</em></a>.
  </p></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="adv-customclass"></a>4.1. Custom PHPlot Class</h2></div></div></div><div class="abstract"><p class="title"><strong></strong></p><p>
This section describes how to create a custom PHPlot class.
  </p></div><p>
If you have a number of applications that use PHPlot, and you want to
standardize some of the PHPlot default settings, you can define your
own class which extends the PHPlot class and changes the default settings.
Here is a short example of a custom PHPlot class, which changes the
following defaults:
  </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Use a TrueType font for all text</p></li><li class="listitem"><p>Change the default image size to 800 x 600</p></li><li class="listitem"><p>Change the default title colors to red</p></li></ul></div><p>
</p><p>
To extend the PHPlot class, declare your class as shown below. Make sure
your class constructor calls the PHPlot class constructor before changing
any settings.
</p><pre class="programlisting">&lt;?php
# Define a custom PHPlot class

// Load the PHPlot class first
require_once 'phplot.php';

// Define a class which extends PHPlot:
class my_phplot extends PHPlot {
  function __construct($width=800, $height=600, $out=NULL, $in=NULL)
  {
    parent::__construct($width, $height, $out, $in);
    $this-&gt;SetDefaultTTFont('LiberationSans-Bold'); // System dependent
    $this-&gt;SetTitleColor('red');
  }
}
</pre><p>
</p><p>
To use this custom PHPlot class, use <code class="literal">require_once</code> to
include the file containing the class definition, then create an instance
of the custom class.
</p><pre class="programlisting">$plot = new my_phplot();
</pre><p>
You can then use the <code class="literal">$plot</code> object exactly the same as
you might use any other PHPlot object.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="conc-errors.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="part1.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="adv-serialize.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.9. Error Handling </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 4.2. PHPlot Object Serialization</td></tr></table></div></body></html>