About
RGraph is a JavaScript charts library based on
HTML5 SVG and canvas. RGraph is mature (over 15 years
old) and has a wealth of features making it an ideal
choice to use for showing charts on your website.
Download
Get the latest version of RGraph (version 6.18, 1st June 2024) 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 shadowOffsetY property
This sets the y-axisoffset of the shadow. Values can be positive (the shadows
are cast
down) or negative (the shadows are cast up).
Inner shadows are not supported but are achievable if you:
- 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
You can find details of inner shadows at the link below.
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 = 0;
context.shadowOffsetY = 30;
context.shadowBlur = 15;
context.fillStyle = 'red';
context.fillRect(x, y, width, height);
}
</script>