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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>5.34. Example - Overlaying Plots</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-linepoints2.html" title="5.33. Example - Linepoints Plot with Data Value Labels" /><link rel="next" href="ex-legendshape.html" title="5.35. Example - Legend with Shape Markers" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.34. Example - Overlaying Plots</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ex-linepoints2.html">Prev</a> </td><th width="60%" align="center">Chapter 5. PHPlot Examples</th><td width="20%" align="right"> <a accesskey="n" href="ex-legendshape.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-outbreak"></a>5.34. Example - Overlaying Plots</h2></div></div></div><p>
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This example shows overlay plots, where multiple plots are drawn at the same
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position on the same image. In this case, one plot contains a stacked bar
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plot, and the second is a linepoints plot. The two plots also have
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different Y axis scales.
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</p><p>
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See <a class="xref" href="adv-multiplot.html" title="4.8. Multiple Plots Per Image">Section 4.8, “Multiple Plots Per Image”</a> for more information.
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</p><div class="example"><a id="example-outbreak"></a><p class="title"><strong>Example 5.34. Overlaying Plots</strong></p><div class="example-contents"><div class="informalfigure"><div class="mediaobject"><img src="examples/outbreak.png" alt="Overlay Plot Example" /></div></div><pre class="programlisting"><?php
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# PHPlot Example: Plot Overlay (lines and stackedbars)
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require_once 'phplot.php';
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$title = '2009 Outbreak, Positive Tests';
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# Note: Graph is based on the real thing, but the data is invented.
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# Data for plot #1: stackedbars:
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$y_title1 = 'Number of positive tests';
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$data1 = array(
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array('1/09', 200, 200, 300),
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array('2/09', 300, 100, 700),
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array('3/09', 400, 200, 800),
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array('4/09', 500, 300, 1200),
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array('5/09', 400, 400, 2500),
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array('6/09', 500, 600, 3600),
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array('7/09', 400, 1200, 3300),
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array('8/09', 300, 1500, 2500),
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array('9/09', 200, 1900, 800),
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array('10/09', 100, 2000, 200),
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array('11/09', 100, 2500, 100),
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array('12/09', 100, 2700, 200),
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);
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$legend1 = array('Strain A', 'Strain B', 'Strain C');
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# Data for plot #2: linepoints:
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$y_title2 = 'Percent Positive';
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$data2 = array(
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array('1/09', 5),
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array('2/09', 10),
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array('3/09', 15),
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array('4/09', 30),
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array('5/09', 40),
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array('6/09', 45),
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array('7/09', 47),
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array('8/09', 35),
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array('9/09', 25),
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array('10/09', 20),
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array('11/09', 25),
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array('12/09', 30),
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);
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$legend2 = array('% positive');
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$plot = new PHPlot(800, 600);
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$plot->SetImageBorderType('plain'); // For presentation in the manual
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$plot->SetPrintImage(False); // Defer output until the end
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$plot->SetTitle($title);
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$plot->SetPlotBgColor('gray');
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$plot->SetLightGridColor('black'); // So grid stands out from background
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# Plot 1
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$plot->SetDrawPlotAreaBackground(True);
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$plot->SetPlotType('stackedbars');
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$plot->SetDataType('text-data');
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$plot->SetDataValues($data1);
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$plot->SetYTitle($y_title1);
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# Set and position legend #1:
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$plot->SetLegend($legend1);
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$plot->SetLegendPixels(5, 30);
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# Set margins to leave room for plot 2 Y title on the right.
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$plot->SetMarginsPixels(120, 120);
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# Specify Y range of these data sets:
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$plot->SetPlotAreaWorld(NULL, 0, NULL, 5000);
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$plot->SetYTickIncrement(500);
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$plot->SetXTickLabelPos('none');
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$plot->SetXTickPos('none');
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# Format Y tick labels as integers, with thousands separator:
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$plot->SetYLabelType('data', 0);
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$plot->DrawGraph();
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# Plot 2
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$plot->SetDrawPlotAreaBackground(False); // Cancel background
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$plot->SetDrawYGrid(False); // Cancel grid, already drawn
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$plot->SetPlotType('linepoints');
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$plot->SetDataValues($data2);
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# Set Y title for plot #2 and position it on the right side:
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$plot->SetYTitle($y_title2, 'plotright');
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# Set and position legend #2:
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$plot->SetLegend($legend2);
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$plot->SetLegendPixels(690, 30);
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# Specify Y range of this data set:
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$plot->SetPlotAreaWorld(NULL, 0, NULL, 50);
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$plot->SetYTickIncrement(10);
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$plot->SetYTickPos('plotright');
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$plot->SetYTickLabelPos('plotright');
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$plot->SetDataColors('black');
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# Format Y tick labels as integers with trailing percent sign:
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$plot->SetYLabelType('data', 0, '', '%');
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$plot->DrawGraph();
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# Now output the graph with both plots:
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$plot->PrintImage();
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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-linepoints2.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-legendshape.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">5.33. Example - Linepoints Plot with 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"> 5.35. Example - Legend with Shape Markers</td></tr></table></div></body></html>
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