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 rect function
The rect function is used whilst drawing paths to the canvas to draw a
rectangle to the canvas. Nothing is actually drawn to
the canvas until you call the stroke or fill functions.
Arguments to the function
- The
x-axiscoordinate (of the center point) - The
y-axiscoordinate (of the center point) - The width of the rectangle
- The height of the rectangle
An example
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
context.beginPath();
context.rect(50, 50, 100, 100);
context.stroke();
}
</script>