How to resize text on canvas?

How to change width of the text with transforming tool?

Remember, that Konva.Transformer is changing scaleX and scaleY properties of a node.
If you want to change width of the text, without changing its size, you should reset scale of a text back to 1 and adjust width accordantly.

You can use transform event to update text’s properties as you need it.

Instructions: Try to resize a text.

Konva Text resize Demoview raw
<!DOCTYPE html>
<html>
<head>
<!-- USE DEVELOPMENT VERSION -->
<script src="https://unpkg.com/[email protected]/konva.min.js"></script>
<meta charset="utf-8" />
<title>Konva Resize Text 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 text = new Konva.Text({
x: 50,
y: 60,
fontSize: 20,
text: 'Hello from the Konva framework. Try to resize me.',
draggable: true,
});
layer.add(text);

var MIN_WIDTH = 20;
var tr = new Konva.Transformer({
nodes: [text],
padding: 5,
// enable only side anchors
enabledAnchors: ['middle-left', 'middle-right'],
// limit transformer size
boundBoxFunc: (oldBox, newBox) => {
if (newBox.width < MIN_WIDTH) {
return oldBox;
}
return newBox;
},
});
layer.add(tr);
layer.draw();

text.on('transform', () => {
// with enabled anchors we can only change scaleX
// so we don't need to reset height
// just width
text.setAttrs({
width: Math.max(text.width() * text.scaleX(), MIN_WIDTH),
scaleX: 1,
scaleY: 1,
});
});
</script>
</body>
</html>