34 lines
3.8 KiB
HTML
34 lines
3.8 KiB
HTML
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>The Init() method</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="ch35.html" title="Chapter 35. Creating Critical chain buffer penetration charts"></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">The Init() method</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 35. Creating Critical chain buffer penetration charts</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="The Init() method"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2621746"></a>The Init() method</h2></div></div></div>
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<p>This is the real method that actually constructs the graph. While we will not go
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through every single line in details we will highlight the complications and some
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formatting options we have used.</p>
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<div class="section" title="Creating the colored backgrounds"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2622039"></a>Creating the colored backgrounds</h2></div></div></div>
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<p>In order to create the colored background we create filled area plots and add
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them to the graph. Starting with the "brown" and successively adding the rest to
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create the colored band effect we want. <a class="xref" href="ch35s03.html#fig.ccbp-background-step" title="Figure 35.6. Steps to create the background">Figure 35.6. Steps to create the background</a> shows in "slow-motion" how this is
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done by adding four area plots, one at a time.</p>
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<div class="figure"><a name="fig.ccbp-background-step"></a><p class="title"><b>Figure 35.6. Steps to create the background</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/ccbp-creating-background-indicators.png" alt="Steps to create the background"></div>
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</div></div><br class="figure-break">
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<p>The exact position for the lines are calculated with the positions given for
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each color band. The position for each color band is specified by giving the
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y-coordinate at x=0 and the y-coordinate at the maximum x-scale value.</p>
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<p>When adding the area plots there is one thing we have to modify. By default
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the fill is done between the line and the y=0 line. In our case we need the fill
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to go all the way down to the min y-value. To change this behavior we need to
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call the method</p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">LinePlot::SetFillFromYMin()</code></p>
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</li></ul></div><p>
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</p>
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<p>for each of the areas.</p>
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</div>
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