Meter Chart Application

Sample of an interactive Chart Application

This chart shows a measurement for downloads. I have added two buttons to trigger the measurement by calling a small javascript which issues a download request, calculates the timings and posts the result. The event script (see parameter event_script), which adds an events listener, catches the post and updates the meter chart.
[No canvas support]>


Installation of this Sample

Insert Script-tag for javascript measurement program into your Joomla Article:
<script src="/plugins/content/rgraph/js/demo.js" type='text/javascript' ></script>
Having done this, code rgraph plugin-tags:
{rgraph type="Meter" max="100" value="0" valueTextUnitsPost=" Mbps" title="Your Download Speed"
width="600" height="300" chart_name="chart" event_script="plugins/content/rgraph/js/meter_event.js"
titleSize="11" greenColor="Gradient(rgba(0,128,0,0.3):rgba(0,128,0,0.4):rgba(0,128,0,0.8):rgb(0,102,34))"
needleColor="rgba(77,77,77,0.9)" "valueTextDecimals="2" scaleDecimals="0" valueText="true" 
And finally insert html-tags to define buttons for controlling application:
<button type="button" onclick="measure_speed('php-apps/RGraph/images');" >Start Measurement</button>
<button type="button" onclick="postMessage(0, '*');">Reset</button>
The measurement program uses 5MB sized Image "31120037-5mb.jpg" (you may have a look at it and download it). Directory for image needs to be added as parameter for the called measurement program in onclick-parameter of first button.
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