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.
Version 7.01 (released in October 2025) is the
latest version of RGraph and now includes a new tree
structure object. The accompanying Treemenu object can then turn
the object into a fully dynamic tree menu.
You can read the API documentation for the tree on
the main API documentation page
and see an example of the Treemenu
feature by following this link...
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.
Get the latest version of RGraph (version 7.01, 8th October 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.
The font property sets how any text that you draw on the
canvas appears. It's read like css font declarations are and you
can have bold, italic or bold and italic text if you wish.
Rotating text
Whilst there is no option to rotate text it can be achieved by rotating
the canvas first, draw the text (which appears as it
would - horizontally) and then rotate the canvas back. Lots of the text
functionality can be wrapped up in a custom function
(that you can write) to save repeating code. There's one such function
linked at the bottom. This function encapsulates
options for bolding, italics, multiple line text etc.
Examples of setting the font property
You can use css style font declarations like this:
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
// Different font settings
context.font = 'Bold 19pt Arial';
context.font = 'Italic 19px Arial';
context.font = 'bold italic 19px Arial';
context.font = '250% Monospace';
}
</script>