A customised and adjustable Gauge chart

This example Gauge chart doesn't use the built-in adjusting but uses a custom click event listener (which you can see below) in order to make the adjusting animated. It also uses a custom draw event to draw the centerpin.

[No canvas support]

This goes in the documents header: 
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.common.effects.js"></script>
<script src="RGraph.gauge.js"></script>
Put this where you want the chart to show up: 
<canvas id="cvs" width="250" height="250" style="background-color: black; border-radius: 125px; box-shadow: 0 0 25px gray; border: 5px solid #ddd">
    [No canvas support]
</canvas>
This is the code that generates the chart: