Drag and Drop Stress Test with 10,000 Shapes

Konva Drag and Drop Stress Test with 10,000 Shapes Demoview raw
<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.rawgit.com/konvajs/konva/1.7.6/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Drag and Drop Stress Test with 10,000 Shapes 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;

function addCircle(layer) {
var color = colors[colorIndex++];
if(colorIndex >= colors.length) {
colorIndex = 0;
}

var randX = Math.random() * stage.getWidth();
var randY = Math.random() * stage.getHeight();
var circle = new Konva.Circle({
x: randX,
y: randY,
radius: 6,
fill: color
});

layer.add(circle);
}

var stage = new Konva.Stage({
container: 'container',
width: width,
height: height
});

var dragLayer = new Konva.Layer();
var colors = ['red', 'orange', 'yellow', 'green', 'blue', 'cyan', 'purple'];
var colorIndex = 0;

var layersArr = [];
/*
* create 10 layers each containing 1000 shapes to create
* 10,000 shapes. This greatly improves performance because
* only 1,000 shapes will have to be drawn at a time when a
* circle is removed from a layer rather than all 10,000 shapes.
* Keep in mind that having too many layers can also slow down performance.
* I found that using 10 layers each made up of 1,000 shapes performs better
* than 20 layers with 500 shapes or 5 layers with 2,000 shapes
*/
for(var i = 0; i < 10; i++) {
var layer = new Konva.Layer();
layersArr.push(layer);

for(var n = 0; n < 1000; n++) {
addCircle(layer);
}

stage.add(layer);
}
stage.add(dragLayer);

stage.on('mousedown', function(evt) {
var circle = evt.target;
var layer = circle.getLayer();

circle.moveTo(dragLayer);
layer.draw();
circle.startDrag();
});
</script>

</body>
</html>