About
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.
New datagrid in v6.21
In version 6.21 a new datagrid object has been 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.
Download
Get the latest version of RGraph (version 6.21, 10th April 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.
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.The closePath function
The closePath function is used to mark the path you're drawing as closed
so that you can begin another. It's important to remember
that this function doesn't always need to be used - the deciding factor can
be whether you want to draw a line back to the start
point for the current path. Sometimes this isn't applicable though - such as
when your path is only drawing a rectangle. In this
case, the closePath might not be needed and you can just start a new path
with the beginPath function - and not call closePath.
In this case, the closePath is implied by starting a new path
(but without drawing a connecting line to the start of the new path).
An example
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
context.beginPath();
context.arc(100,100, 50, 0, Math.PI, false);
// This connects back to the start of the arc
context.closePath();
context.stroke();
}
</script>