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 shadowBlur property
This sets the amount of blurring that the shadow has. In conjunction with the
clip function and setting the offset X/Y values
to zero you can achieve inner shadows:
- Draw a shape
- Clip the
canvasto that shape - Draw an outline of that shape just outside the clipped area with shadow enabled
- Set the shadow X/Y offsets to 0
- Half the shadow will fall inside the clipped area and will thus be drawn on your
canvas
An example
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
var x = 50;
var y = 50;
var width = 100;
var height = 100;
context.shadowColor = '#ccc';
context.shadowOffsetX = 3;
context.shadowOffsetY = 3;
context.shadowBlur = 25;
context.fillStyle = 'red';
context.fillRect(x, y, width, height);
}
</script>