HTML5 canvas Rect Tutorial

To create a rectangle with Konva, we can instantiate a Konva.Rect() object.

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

You can define corner radius for Konva.Rect. It can be simple number or array of numbers [topLeft, topRight, bottomRight, bottomLeft].

Konva Rect Demoview raw
<!DOCTYPE html>
<script src="[email protected]/konva.min.js"></script>
<meta charset="utf-8" />
<title>Konva Rect Demo</title>
body {
margin: 0;
padding: 0;
overflow: hidden;
background-color: #f0f0f0;
<div id="container"></div>
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 rect1 = new Konva.Rect({
x: 20,
y: 20,
width: 100,
height: 50,
fill: 'green',
stroke: 'black',
strokeWidth: 4,
// add the shape to the layer

var rect2 = new Konva.Rect({
x: 150,
y: 40,
width: 100,
height: 50,
fill: 'red',
shadowBlur: 10,
cornerRadius: 10,

var rect3 = new Konva.Rect({
x: 50,
y: 120,
width: 100,
height: 100,
fill: 'blue',
cornerRadius: [0, 10, 20, 30],

// add the layer to the stage
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