Clipping Functions Tutorial

How to clip nodes in the layer?

To draw things inside of complex clipping regions with Konva, we can set the clipFunc
property of a group, a layer.
In this tutorial, we’ll draw blobs inside of a two circles clipping region applied to a group.

Konva Clipping Functions Demoview raw
<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/[email protected]/konva.min.js"></script>
<meta charset="utf-8" />
<title>Konva Clipping Function 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 group = new Konva.Group({
clipFunc: function (ctx) {
ctx.arc(250, 120, 50, 0, Math.PI * 2, false);
ctx.arc(150, 120, 60, 0, Math.PI * 2, false);
},
draggable: true,
});

var blueBlob = new Konva.Line({
points: [73, 140, 340, 23, 500, 109, 300, 170],
stroke: 'blue',
strokeWidth: 10,
fill: '#aaf',
tension: 0.8,
closed: true,
});

var redBlob = new Konva.Line({
points: [73, 140, 340, 23, 500, 109],
stroke: 'red',
strokeWidth: 10,
fill: '#faa',
tension: 1.2,
scale: { x: 0.5, y: 0.5 },
x: 100,
y: 50,
closed: true,
});

group.add(blueBlob);
group.add(redBlob);
layer.add(group);

// add the layer to the stage
stage.add(layer);
</script>
</body>
</html>
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