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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Stock graphs</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="ch15.html" title="Chapter 15. Different types of linear (cartesian) graph types"></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">Stock graphs</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 15. Different types of linear (cartesian) graph types</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Stock graphs"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sec1.creating-stock-graphs"></a>Stock graphs</h2></div></div></div>
<p>Stock charts are used to display data values where one is interested in 4
different values for each data point. This could for example be used to display a
stocks open,close, min and max value during a specific day. Hence the name Stock
chart (or Stock plot).</p>
<p>Stock plots are created as an instance of <code class="code">class StockPlot</code> so the
module "<code class="filename">jpgraph_stock.php</code>" must first be included in the
script.</p>
<p><a class="xref" href="ch15s04.html#fig.stockex1" title="Figure 15.62. A stock graph (stockex1.php)">Figure 15.62. A stock graph <code class="uri"><a class="uri" href="example_src/stockex1.html" target="_top">(<code class="filename">stockex1.php</code>)</a></code> </a>illustrates a sample Stock chart plot</p>
<p>
</p><div class="figure"><a name="fig.stockex1"></a><p class="title"><b>Figure 15.62. A stock graph <code class="uri"><a class="uri" href="example_src/stockex1.html" target="_top">(<code class="filename">stockex1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/stockex1.png" alt="A stock graph (stockex1.php)"></span> </div></div><p><br class="figure-break">
</p>
<p>For this type of plot the y-data array must be consist of a number of quadruples
of data where each quadruple consists of (open,close,min,max). The open and close
values determine the min max for the middle bar and the min,max determine the end
points of the "error-lines" at the top and bottom of each bar as shown in ??.</p>
<p>
</p><div class="informaltable">
<table border="0"><colgroup><col class="c1"><col class="c2"></colgroup><tbody><tr><td valign="top">
<div class="figure"><a name="fig.details-stock-chart"></a><p class="title"><b>Figure 15.63. Explaining stock graphs</b></p><div class="figure-contents">
<p>
<span class="inlinemediaobject"><img src="images/stock-detail-explanation.png" alt="Explaining stock graphs"></span>
</p>
</div></div><br class="figure-break">
</td><td valign="top">
<p>For this type of plot the y-data array must be consist of
a number of quadruples of data where each quadruple consists
of an even number of (open,close,min,max). </p>
<p>The open and close values determine the min max for the
middle bar and the min,max determine the end points of the
"error-lines" at the top and bottom of each bar as shown in
<a class="xref" href="ch15s04.html#fig.details-stock-chart" title="Figure 15.63. Explaining stock graphs">Figure 15.63. Explaining stock graphs</a>.</p>
<p>Note that the data follows the rules</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p>min < max</p>
</li><li class="listitem">
<p>min < min( open, close )</p>
</li><li class="listitem">
<p>max > max( open, close )</p>
</li></ul></div><p>
</p>
</td></tr></tbody></table>
</div><p>
</p>
<p>To separate the two cases where "open > close" or "open < close " two different
colors are used. </p>
<p>These colors are specified with the method</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p><code class="code">StockPlot::SetColor($aFrame, $aFill='white',
$aFrameNeg='darkred', $aFillNeg='darkred')</code></p>
<p><code class="code">$aFrame</code>, <code class="code">$aFill</code>, The frame and fill color
when open <= close</p>
<p><code class="code">$aFrameNeg</code>, <code class="code">$aFillNeg</code>, The frame and fill
color when open > close</p>
</li></ul></div><p>
</p>
<p><code class="code">StockPlot::SetColor()</code> method. By default a positive bar (close >
open) have a fill color of white and for the negative case where (close < open)
the bars have a red color.</p>
<p>The final possible variation of stock plots is the option to determine whether or
not the end point for the min,max lines should have the horizontal line marking the
end of the line or not. This can be adjusted with a call to method</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p><code class="code">StockPlot::HideEndLines($aHide=true)</code></p>
</li></ul></div><p>
</p>
<div class="sect2" title="Stock plot variant: Boxplot"><div class="titlepage"><div><div><h3 class="title"><a name="id2561152"></a>Stock plot variant: Boxplot</h3></div></div></div>
<p>A minor variation of stock charts is the <code class="code">BoxPlot</code> plot type. this
is almost the same as <code class="code">StockPlot</code> but with the very small difference
that in addition to the open,close,min, max values it is also possible to
specify a fifth, median value . </p>
<p>A box plot is created as in instance of <code class="code">class BoxPlot</code> which is
defined in "<code class="filename">jpgraph_stock.php</code>"</p>
<p>The median lies between the open and close value and is illustrated as a
horizontal line within the bar. An example of this is shown in </p>
<p>
</p><div class="figure"><a name="fig.boxstockex1"></a><p class="title"><b>Figure 15.64. A typical boxplot <code class="uri"><a class="uri" href="example_src/boxstockex1.html" target="_top">(<code class="filename">boxstockex1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/boxstockex1.png" alt="A typical boxplot (boxstockex1.php)"></span> </div></div><p><br class="figure-break">
</p>
<p>The color of the median line can be modified with a call to </p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p><code class="code">BoxPlot::SetMedianColor($aColor)</code></p>
</li></ul></div><p>
</p>
</div>
<div class="sect2" title="Image maps for Box and Stock charts"><div class="titlepage"><div><div><h3 class="title"><a name="id2561251"></a> Image maps for Box and Stock charts</h3></div></div></div>
<p>In the same way as for other plots it is possible to associate an image map
with these plots. The "hot" area for each plot is the mid "bar" section. In the
same way as other plot types the method </p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p><code class="code">BoxPlot::SetCSIMTargets($aTargets,$aAlts='',$aWinTargets='')</code></p>
</li></ul></div><p>
</p>
<p>is used to set the URL:s for the hot areas</p>
</div>
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