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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>5.40. Example - Bubbles 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-encodeimage.html" title="5.39. Example - Embedding Image with EncodeImage" /><link rel="next" href="ex-pielabeltype.html" title="5.41. Example - Pie Chart Label Types" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.40. Example - Bubbles Plot</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ex-encodeimage.html">Prev</a> </td><th width="60%" align="center">Chapter 5. PHPlot Examples</th><td width="20%" align="right"> <a accesskey="n" href="ex-pielabeltype.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-bubbles1"></a>5.40. Example - Bubbles Plot</h2></div></div></div><p>
This example shows a <a class="link" href="conc-plottypes.html#plottype-bubbles" title="3.4.4. Plot Type: bubbles (Bubble Plot)">bubbles plot</a>.
A data array for a bubbles plot uses the
<a class="link" href="conc-datatypes.html#data-data-xyz">data-data-xyz</a> data type, in which three
coordinate values specify each point: X and Y are the position on the plot,
and Z maps to the bubble diameter.
</p><p>
In this example, X is the flavor, Y is the age group, and Z represents the
percentage of participants who liked that flavor.
Note that there are two missing points in the Y=1 row.  No bubbles are
drawn at X=3,Y=1 or X=5,Y=1.
Presumably, no-one under 12 would try the pear or kiwi flavors, so there are
no valid data points there. This is different from a value Z=0, which
would be plotted with a bubble of the smallest size.
</p><p>
This plot type was added in PHPlot-5.5.0.
</p><p>
This example also shows the use of custom Y labels. A function
<code class="function">get_label()</code> is defined to map the Y tick value
into a string from an array of strings. This method allows the display
of arbitrary labels along the Y axis.
See <a class="xref" href="SetYLabelType.html" title="SetYLabelType"><span class="refentrytitle">SetYLabelType</span></a> for details.
</p><div class="example"><a id="example-bubbles1"></a><p class="title"><strong>Example 5.40. Bubbles Plot</strong></p><div class="example-contents"><div class="informalfigure"><div class="mediaobject"><img src="examples/bubbles1.png" alt="Bubbles Plot Example" /></div></div><pre class="programlisting">&lt;?php
# PHPlot Example - Bubble Plot
require_once 'phplot.php';

# Array of custom labels for the Y axis. See the get_label callback.
$y_labels = array("", "Age\n12 and under", "Age 13-17", "Age 18-29",
                      "Age 30-39", "Age 40-54", "Age\n55 and older");

# Return the string for a Y label:
function get_label($value, $labels)
{
    if (isset($labels[(int)$value])) return $labels[(int)$value];
    return $value;
}

#                       &lt;=12    13-17   17-28   30-39   40-54    &gt;=55
$data = array(
    array('Cherry', 1,   1, 2,   2, 4,   3, 3,   4, 3,   5, 5,   6, 6),
    array('Apple',  2,   1, 9,   2, 7,   3, 4,   4, 7,   5, 3,   6, 7),
    array('Pear',   3,  '', 2,   2, 2,   3, 3,   4, 4,   5, 3,   6, 2),
    array('Grape',  4,   1, 8,   2, 5,   3, 5,   4, 6,   5, 3,   6, 4),
    array('Kiwi',   5,  '', 0,   2, 3,   3, 4,   4, 4,   5, 5,   6, 2),
    array('Banana', 6,   1, 5,   2, 4,   3, 6,   4, 3,   5, 3,   6, 4),
);

$plot = new PHPlot(600, 600);
$plot-&gt;SetTitle("Flavor Preference By Age Group");
$plot-&gt;SetDataType('data-data-xyz');
$plot-&gt;SetDataValues($data);
$plot-&gt;SetPlotType('bubbles');
$plot-&gt;SetDataColors('yellow'); // Use same color for all data sets
$plot-&gt;SetDrawPlotAreaBackground(True);
$plot-&gt;SetPlotBgColor('plum');
$plot-&gt;SetLightGridColor('red'); // Change grid color to make it visible
$plot-&gt;SetImageBorderType('plain');
$plot-&gt;SetPlotBorderType('full');
$plot-&gt;SetXTickIncrement(1); // For grid line spacing
$plot-&gt;SetYTickIncrement(1);
$plot-&gt;SetPlotAreaWorld(0, 0, 6.5, 6.5);
# Establish the handler for the Y label text:
$plot-&gt;SetYLabelType('custom', 'get_label', $y_labels);
$plot-&gt;SetXTickPos('both'); // Tick marks on both sides
$plot-&gt;SetYTickPos('both'); // Tick marks on top and bottom too
$plot-&gt;SetXDataLabelPos('both'); // X axis data labels top and bottom
$plot-&gt;SetYTickLabelPos('both'); // Y axis labels left and right
$plot-&gt;SetDrawXGrid(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="ex-encodeimage.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-pielabeltype.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">5.39. Example - Embedding Image with EncodeImage </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 5.41. Example - Pie Chart Label Types</td></tr></table></div></body></html>