HTML5 canvas Blob Tutorial

To create a blob with Konva, we can instantiate a Konva.Line() object with closed = true and tension attributes.

For a full list of attributes and methods, check out the Konva.Line documentation.

Konva Blob Demoview raw
<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.rawgit.com/konvajs/konva/1.6.3/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Line Blob Demo</title>
<style>
body {
margin: 0;
padding: 0;
overflow: hidden;
background-color: #F0F0F0;
}
</style>
</head>
<body>
<div id="container"></div>
<script>
var width = window.innerWidth;
var height = window.innerHeight;
var stage = new Konva.Stage({
container: 'container',
width: width,
height: height
});
var layer = new Konva.Layer();
var blob = new Konva.Line({
points: [23, 20, 23, 160, 70, 93, 150, 109, 290, 139, 270, 93],
fill: '#00D2FF',
stroke: 'black',
strokeWidth: 5,
closed : true,
tension : 0.3
});
// add the shape to the layer
layer.add(blob);
// add the layer to the stage
stage.add(layer);
</script>
</body>
</html>