About
RGraph is a JavaScript charts library based on
HTML5 SVG and canvas. RGraph is mature (over 17 years
old) and has a wealth of features making it an ideal
choice to use for showing charts on your website.
New HTML datagrid
In the April 2025 release a new datagrid object
was added.
This makes it easy to add static or dynamic data
tables to your pages. It can be used whether you use the
canvas or SVG libraries or entirely standalone.
Download
Get the latest version of RGraph (version 6.22, 24th June 2025) from
the download page. You can read the changelog here. There's also older versions available,
minified files and links to cdnjs.com hosted libraries.
License
RGraph can be used for free under the GPL or if
that doesn't suit your situation there's an
inexpensive (£129) commercial license available.HOWTO: Create a bank of Gauge charts
- The original Gauge charts
- The Gauge charts now that they're adjustable
- Making the Gauge charts animated
Now that RGraph supports multiple charts on a single canvas creating a bank of Gauge charts or other meters is a simple matter and allows you to create powerful responsive control panels.
This example uses the Gauge chart though the principle is the same for all types of RGraph meter.
The original Gauge charts
These are the original Gauge charts before they have been made adjustable.
<script> new RGraph.Gauge({ id: 'cvs', min: 0, max: 100, value:67, options: { centerx: 100, marginLeft: 15, marginRight: 15, marginTop: 15, marginBottom: 15 } }).draw() new RGraph.Gauge({ id: 'cvs', min: 0, max: 100, value:45, options: { centerx: 300 marginLeft: 15, marginRight: 15, marginTop: 15, marginBottom: 15 } }).draw() new RGraph.Gauge({ id: 'cvs', min: 0, max: 100, value:13, options: { centerx: 500 marginLeft: 15, marginRight: 15, marginTop: 15, marginBottom: 15 } }).draw() </script>
The Gauge charts now that they're adjustable
These are the Gauge charts now that they have been made adjustable.
<script> new RGraph.Gauge({ id: 'cvs', min: 0, max: 100, value:67, options: { centerx: 100, adjustable: true, marginLeft: 15, marginRight: 15, marginTop: 15, marginBottom: 15 } }).draw() new RGraph.Gauge({ id: 'cvs', min: 0, max: 100, value:45, options: { centerx: 300, adjustable: true, marginLeft: 15, marginRight: 15, marginTop: 15, marginBottom: 15 } }).draw() new RGraph.Gauge({ id: 'cvs', min: 0, max: 100, value:13, options: { centerx: 500, adjustable: true, marginLeft: 15, marginRight: 15, marginTop: 15, marginBottom: 15 } }).draw() </script>
Making the Gauge charts animated
By default, the Gauge charts aren't animated when they're adjustable, however, this is a simple addition and involves handling the adjusting yourself.
<script>
myGauge1 = new RGraph.Gauge({
id: 'cvs',
min: 0,
max: 100,
value:67,
options: {
centerx: 100,
marginLeft: 15,
marginRight: 15,
marginTop: 15,
marginBottom: 15
}
}).draw();
myGauge2 = new RGraph.Gauge({
id: 'cvs',
min: 0,
max: 100,
value:45,
options: {
centerx: 300,
marginLeft: 15,
marginRight: 15,
marginTop: 15,
marginBottom: 15
}
}).draw();
myGauge3 = new RGraph.Gauge({
id: 'cvs',
min: 0,
max: 100,
value:13,
options: {
centerx: 500,
marginLeft: 15,
marginRight: 15,
marginTop: 15,
marginBottom: 15
}
}).draw()
// You only need to add the custom event listener once
myGauge1.canvas.onmousedown = function (e)
{
var obj = RGraph.ObjectRegistry.getFirstObjectByXY(e);
if (obj) {
obj.value = obj.getValue(e);
obj.grow();
}
}
</script>