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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>5.2. Example - Line Plot: Functions</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="examples.html" title="Chapter 5. PHPlot Examples" /><link rel="next" href="ex-area1.html" title="5.3. Example - Area Plot" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.2. Example - Line Plot: Functions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="examples.html">Prev</a> </td><th width="60%" align="center">Chapter 5. PHPlot Examples</th><td width="20%" align="right"> <a accesskey="n" href="ex-area1.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-lines2"></a>5.2. Example - Line Plot: Functions</h2></div></div></div><p>
This is a line plot showing the graph of sin(x) and cos(x).
This uses quite a few of the PHPlot style control functions
to tune the appearance of the plot.
</p><div class="example"><a id="example-lines2"></a><p class="title"><strong>Example 5.2. Line Plot: Functions</strong></p><div class="example-contents"><div class="informalfigure"><div class="mediaobject"><img src="examples/lines2.png" alt="Line Plot Functions Example" /></div></div><pre class="programlisting">&lt;?php
# PHPlot Example: Line graph, 2 lines
require_once 'phplot.php';

# Generate data for:
#   Y1 = sin(x)
#   Y2 = cos(x)
$end = M_PI * 2.0;
$delta = $end / 20.0;
$data = array();
for ($x = 0; $x &lt;= $end; $x += $delta)
  $data[] = array('', $x, sin($x), cos($x));

$plot = new PHPlot(800, 600);
$plot-&gt;SetImageBorderType('plain');

$plot-&gt;SetPlotType('lines');
$plot-&gt;SetDataType('data-data');
$plot-&gt;SetDataValues($data);

# Main plot title:
$plot-&gt;SetTitle('Line Plot, Sin and Cos');

# Make a legend for the 2 functions:
$plot-&gt;SetLegend(array('sin(t)', 'cos(t)'));

# Select a plot area and force ticks to nice values:
$plot-&gt;SetPlotAreaWorld(0, -1, 6.8, 1);

# Even though the data labels are empty, with numeric formatting they
# will be output as zeros unless we turn them off:
$plot-&gt;SetXDataLabelPos('none');

$plot-&gt;SetXTickIncrement(M_PI / 8.0);
$plot-&gt;SetXLabelType('data');
$plot-&gt;SetPrecisionX(3);

$plot-&gt;SetYTickIncrement(0.2);
$plot-&gt;SetYLabelType('data');
$plot-&gt;SetPrecisionY(1);

# Draw both grids:
$plot-&gt;SetDrawXGrid(True);
$plot-&gt;SetDrawYGrid(True);

$plot-&gt;DrawGraph();
</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="examples.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-area1.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 5. PHPlot Examples </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 5.3. Example - Area Plot</td></tr></table></div></body></html>