<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/konva@9.3.18/konva.min.js"></script>
<meta charset="utf-8" />
<title>Konva Rotation Animation 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();
/*
* leave center point positioned
* at the default which is the top left
* corner of the rectangle
*/
var blueRect = new Konva.Rect({
x: 50,
y: 75,
width: 100,
height: 50,
fill: '#00D2FF',
stroke: 'black',
strokeWidth: 4,
});
/*
* move center point to the center
* of the rectangle with offset
*/
var yellowRect = new Konva.Rect({
x: 220,
y: 75,
width: 100,
height: 50,
fill: 'yellow',
stroke: 'black',
strokeWidth: 4,
offset: {
x: 50,
y: 25,
},
});
/*
* move center point outside of the rectangle
* with offset
*/
var redRect = new Konva.Rect({
x: 400,
y: 75,
width: 100,
height: 50,
fill: 'red',
stroke: 'black',
strokeWidth: 4,
offset: {
x: -100,
y: 0,
},
});
layer.add(blueRect);
layer.add(yellowRect);
layer.add(redRect);
stage.add(layer);
var angularSpeed = 90;
var anim = new Konva.Animation(function (frame) {
var angleDiff = (frame.timeDiff * angularSpeed) / 1000;
blueRect.rotate(angleDiff);
yellowRect.rotate(angleDiff);
redRect.rotate(angleDiff);
}, layer);
anim.start();
</script>
</body>
</html>
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