HTML5 Canvas Simple Clipping tutorial

To draw things inside of clipping regions with Konva, we can set the clip
property of any container, including a group, a layer, or the stage.
Clipping regions are defined by an x, y, width, and height. In this tutorial,
we’ll draw blobs inside of a rectangular clipping region applied to a group.

For more complex cases take a look into clipping function. Clipping Function

Konva Simple Clipping Demoview raw
<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.rawgit.com/konvajs/konva/1.6.0/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Simple Clipping 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({
clip: {
x : 100,
y : 40,
width : 200,
height : 100
},
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>