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 beginPath function can be used to begin a new path,
with nothing in it, to draw on your canvas. It's a good idea to use
because if you start using animation you may get trailing,
connecting lines, which only become apparent in animations. These lines
can be due to paths at the end of the drawing being left open and then
connecting to the start of the drawing on the next frame.
The beginPath function in effect "resets" the path - emptying it of
all sub-paths. It's a good idea to use this function whenever you
start a new "section" of drawing. There is an associated
closePath function but this has the
(sometimes undesired) side effect of drawing a line from the last point
in your path back to the starting point.
An example
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
// Start a new path
context.beginPath();
context.rect(50,50,100,100);
context.stroke();
}
</script>