.net Powerful JavaScript charts
RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to use for showing charts on your website.

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Get the latest version of RGraph (version 6.18, 1st June 2024) from the download page. You can read the changelog here. There's also older versions available, minified files and links to hosted libraries.

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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.

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How do I download the graph with the correct pointer value?

Posted by Joao Pedro at 19:08 on Tuesday 28th February 2023 [link]
I try download of graph with code below:
$(".test").append(`<a download href='${obj.canvas.toDataURL("image/png")}'>Test</a><br>`);
but when I download the graphic it has the wrong pointer value.
Attached image:
Attached image

Posted by Richard at 20:25 on Tuesday 28th February 2023 [link]
Is the chart showing the correct value when the button is pressed? Is there an animation involved?

Can you link to the page that the chart is on or put an example online? What happens if you put a regular, static link on the page for example:

<a href="#" onclick="location.href = myObject.canvas.toDataURL('image/png')">Test</a>

PS If the canvas is supposed to be white, try clearing it to white before drawing:

m = new RGraph.Meter({
    id: 'cvs',
    min: 0,
    max: 200,
    value: 98,
    options: {
}).on('beforedraw', function (obj)
    RGraph.clear(obj.canvas, 'white');

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