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.
Version 7.11 (released in March 2026) is the
latest version of RGraph and contains just a few
updates to the code which you can see on
the changelog page. There's
a new dumbbell variation for the Bar and Horizontal bar
charts (both SVG and canvas) and the
front page layout of the
website has been tweaked.
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 7.11, 21st March 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.
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>