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 fillText function
The fillText function can be used to add text (not just the outline of
text) to your canvas. You give three arguments
to the function - the text, the X and Y coordinates. But remember that by
default the text is left and bottom aligned
- so if you give coordinates of [0,0] without changing the alignment you
might not see the text because it will be
drawn off-canvas.
Arguments to the function
- The text to display
- The X coordinate
- The Y coordinate
An example
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
context.font = '36pt Arial';
context.fillText('Some example text', 50, 50);
}
</script>
See also