MENU
.net Powerful JavaScript charts
About
RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 18 years old) and has a wealth of features making it an ideal choice to use for showing charts on your website.

More »

 

Version 7.10 released
Version 7.10 (released in January 2026) is the latest version of RGraph and contains various updates to the code which you can see on the changelog page. There's also a big tidy up in terms of comments and a significant change to the way that the internal code is referenced which should lead to a performance improvement in effects and animations.

Download »

 

New HTML datagrid
In the April 2025 (v6.21) 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.

Read more »

 

Download
Get the latest version of RGraph (version 7.10, 18th January 2026) 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.

Download »

 

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.

More »

Performance problems with semi-transparent colors


Posted by Jorg at 09:55 on Friday 23rd July 2021 [link]
Hello,

I have problems with a line chart with two filled ranges in the background:

In old version (v4.62) the filled ranges are filled in black and i want them in red and 20%opacity

In newer version(v6.00) the filled ranges are filled in correct color (red and 20%opacity) but rendering is very slow - 1000ms versus 80ms (in version v4.62) for the same data

Cant find my faults - an suggestions?

Find greets
Jorg

Posted by Jörg at 10:46 on Friday 23rd July 2021 [link]
Little supplement: In version v6.00 I already tested without opacity - no notably difference in performance! Where is the source for performance issues? Or (in other hand) what can I do to set the correct color in version v4.62?

Fine regards
Jorg

Posted by Richard at 11:03 on Friday 23rd July 2021 [link]
Can you post the source code for the chart please?

> no notable difference in performance!

So with solid colors the rendering is satisfactory?

I've made an example here:

[LINK REMOVED]

And there doesn't seem to be any rendering speed issue.

[Replies are closed]