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 HTML datagrid
In the April 2025 release a new datagrid object
was 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 6.22, 24th June 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 lineTo function
The lineTo function is used whilst drawing paths to the canvas to move the 'pen' to a new set of coordinates and drawing a line to the new coordinates. Nothing is actually drawn to the canvas until you call the stroke or fill functions. The color of the line is controlled by setting the strokeStyle property and the width of the line by the lineWidth property.
Note that only the destination X/Y coordinates are given to this function - the start X/Y coordinates are the endpoint of the last drawing operation (eg a moveTo or bezierCurveTo operation).
Arguments to the function
- The x-axis coordinate
- The y-axis coordinate
- The y-axis coordinate
An example
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
context.beginPath();
context.moveTo(100, 100);
context.lineTo(200, 200);
context.stroke();
}
</script>