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How to draw on scroll using JavaScript and SVG?
To draw on scroll using JavaScript and SVG, the code is as follows −
Example
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
body {
height: 2000px;
background: #f1f1f1;
}
svg {
position: fixed;
top: 15%;
width: 400px;
height: 210px;
margin-left: -50px;
}
</style>
</head>
<body>
<h1>Scroll Using JavaScript and SVG example</h1>
<svg>
<path
fill="none"
stroke="purple"
stroke-width="5"
id="polygon"
d="M 150 350 Q 150 50 250 150 Q 250 550 300 150 Q 350 50 400 300"/>
</svg>
<script>
var polygon = document.getElementById("polygon");
var length = polygon.getTotalLength();
polygon.style.strokeDasharray = length;
polygon.style.strokeDashoffset = length;
window.addEventListener("scroll", drawPoly);
function drawPoly() {
var scrollpercent = (document.body.scrollTop + document.documentElement.scrollTop) /
(document.documentElement.scrollHeight - document.documentElement.clientHeight);
var draw = length * scrollpercent;
polygon.style.strokeDashoffset = length - draw;
}
</script>
</body>
</html>Output
The above code will produce the following output −
On scrolling to the bottom of the page −
Updated on: 08-May-2020
383 Views
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