HTML5 Canvas Shape Resize Relative to Center

How to resize shape in both sides simultaneously?

To resize a node into both sides at the same time you can set centeredScaling to true or hold ALT key while moving an anchor (even if centeredScaling is false).

Instructions: Try to resize texts.

Konva Shape transform and selection Demoview raw
<!DOCTYPE html>
<html>

<head>
<!-- USE DEVELOPMENT VERSION -->
<script src="https://unpkg.com/konva@2.4.2/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Centered Scaling 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();
stage.add(layer);

var text1 = new Konva.Text({
x: 50,
y: 70,
fontSize: 30,
text: 'centeredScaling = true',
draggable: true,
});
layer.add(text1);

var tr1 = new Konva.Transformer({
node: text1,
centeredScaling: true
});
layer.add(tr1);



var text2 = new Konva.Text({
x: 50,
y: 200,
fontSize: 30,
text: 'centeredScaling = false',
draggable: true,
});
layer.add(text2);

var tr2 = new Konva.Transformer({
node: text2,
centeredScaling: false
});
layer.add(tr2);


layer.draw();
</script>

</body>

</html>