مورب سازی گوشه های مستطیل cornerRadius

<div id="runing"></div>
<script>

var stage = new Konva.Stage({
        container: 'runing',
        width:150,
        height: 100
    });

    // add canvas element
    var layer = new Konva.Layer();
    stage.add(layer);

var rect = new Konva.Rect({
  width: 100,
  height: 50,
  fill: 'red',
  stroke: 'black',
  strokeWidth: 5
});
// get corner radius
var cornerRadius = rect.cornerRadius();

// set corner radius
rect.cornerRadius(10);

// set different corner radius values
// top-left, top-right, bottom-right, bottom-left
rect.cornerRadius([0, 10, 20, 30]);
layer.add(rect );

    layer.draw();

</script>