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 show charts on your website.
Download
Get the latest version of RGraph (version 6.17) from
the download page. 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 (£99) commercial license available.The lineDashOffset property
The lineDashOffset option is an array property, that is used to set the
pattern of the lineDash when drawing lines. For example,
you can use this setting to make a dotted line or a spaced-out dash
pattern. By increasing this property over time, you can also
create an animation effect.
An example
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
context.lineDashOffset = 3;
context.setLineDash([3,6]);
context.beginPath();
context.arc(125,125,50,0,2 * Math.PI, false);
context.stroke();
}
</script>
See also