HTML5 Canvas Stop Shape Transform

If you need to stop transforming imidiatly you can use stopTransform methods of Konva.Transformer instance.

Instructions: Try to resize a shape. If width of the shape is bigger then 200 transforming will be stopped.

Konva Stop Transform Demoview raw
<!DOCTYPE html>
<html>

<head>
<!-- USE DEVELOPMENT VERSION -->
<script src="https://cdn.rawgit.com/konvajs/konva/2.4.0/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Stop Transform 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 rect = new Konva.Rect({
x: 160,
y: 60,
width: 100,
height: 90,
fill: 'red',
name: 'rect',
stroke: 'black',
draggable: true
});
layer.add(rect);

// create new transformer
var tr = new Konva.Transformer();
layer.add(tr);
tr.attachTo(rect);
layer.draw();


tr.on('transform', function () {
var width = rect.width() * rect.scaleX();
if (width > 200) {
tr.stopTransform();
// reset visible width to 200
// so future transform is possible
var scaleX = 200 / rect.width();
rect.scaleX(scaleX);
}
})
</script>

</body>

</html>