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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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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>5.21. Example - Stacked Area Plot</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="examples.html" title="Chapter 5. PHPlot Examples" /><link rel="prev" href="ex-stackedbars3.html" title="5.20. Example - Stacked Bars with Y Data Value Labels" /><link rel="next" href="ex-annotate.html" title="5.22. Example - Annotating a Plot Using a Callback" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.21. Example - Stacked Area Plot</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ex-stackedbars3.html">Prev</a> </td><th width="60%" align="center">Chapter 5. PHPlot Examples</th><td width="20%" align="right"> <a accesskey="n" href="ex-annotate.html">Next</a></td></tr></table><hr /></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="ex-stackedarea1"></a>5.21. Example - Stacked Area Plot</h2></div></div></div><p>
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The stacked area plot is similar in appearance to the area plot, and this
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example is the same as in <a class="xref" href="ex-area1.html" title="5.3. Example - Area Plot">Section 5.3, “Example - Area Plot”</a> except for the
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plot type and data values. In the stacked area plot, PHPlot accumulates the
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Y values at each X position, similar to the stacked bar plot, and fills the
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area between the resulting values. For example, in 1960, 30% of the candy
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sales were cherry, 10% were lime, and 6% were lemon. In the stacked area
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plot, this is represented simply as (30, 10, 6, ...), whereas in the area
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plot example we had to sum the values to get (100, 70, 60, 54, ...).
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</p><p>
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Also in this example we changed the legend using
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<a class="xref" href="SetLegendReverse.html" title="SetLegendReverse"><span class="refentrytitle">SetLegendReverse</span></a> so the lines of text and color boxes
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are in the same order as the area segments, bottom-to-top.
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</p><p>
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Note this plot type was added in PHPlot-5.1.1.
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</p><div class="example"><a id="example-stackedarea1"></a><p class="title"><strong>Example 5.21. Stacked Area Plot</strong></p><div class="example-contents"><div class="informalfigure"><div class="mediaobject"><img src="examples/stackedarea1.png" alt="Stacked Area Plot Example" /></div></div><pre class="programlisting"><?php
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# PHPlot Example: Stacked Area chart
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require_once 'phplot.php';
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$data = array(
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array('1960', 30, 10, 6, 38, 14, 2),
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array('1970', 20, 17, 9, 32, 2, 20),
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array('1980', 20, 14, 12, 27, 2, 25),
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array('1990', 5, 26, 15, 26, 18, 10),
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array('2000', 28, 0, 18, 16, 33, 5),
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);
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$plot = new PHPlot(800, 600);
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$plot->SetImageBorderType('plain');
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$plot->SetPlotType('stackedarea');
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$plot->SetDataType('text-data');
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$plot->SetDataValues($data);
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# Main plot title:
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$plot->SetTitle('Candy Sales by Flavor');
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# Set Y data limits, tick increment, and titles:
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$plot->SetPlotAreaWorld(NULL, 0, NULL, 100);
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$plot->SetYTickIncrement(10);
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$plot->SetYTitle('% of Total');
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$plot->SetXTitle('Year');
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# Colors are significant to this data:
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$plot->SetDataColors(array('red', 'green', 'blue', 'yellow', 'cyan', 'magenta'));
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$plot->SetLegend(array('Cherry', 'Lime', 'Lemon', 'Banana', 'Apple', 'Berry'));
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# Make legend lines go bottom to top, like the area segments (PHPlot > 5.4.0)
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$plot->SetLegendReverse(True);
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# Turn off X tick labels and ticks because they don't apply here:
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$plot->SetXTickLabelPos('none');
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$plot->SetXTickPos('none');
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$plot->DrawGraph();
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</pre></div></div><br class="example-break" /></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ex-stackedbars3.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="examples.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ex-annotate.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">5.20. Example - Stacked Bars with Y Data Value Labels </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 5.22. Example - Annotating a Plot Using a Callback</td></tr></table></div></body></html>
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