如何保持 Konva 图像纵横比？

如何解决如何保持 Konva 图像纵横比？

我试图保持图像的纵横比。这是演示的链接“https://konvajs.org/docs/shapes/Image.html”

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/konva@7.2.5/konva.min.js"></script>
    <Meta charset="utf-8" />
    <title>Konva Image Demo</title>
 
  </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);

      // main API:
      var imageObj = new Image();
      imageObj.onload = function () {
        var yoda = new Konva.Image({
          x: 50,y: 50,image: imageObj,width: 106,height: 118,});

        // add the shape to the layer
        layer.add(yoda);
        layer.batchDraw();
      };
      imageObj.src = '/assets/yoda.jpg';

      // alternative API:
      Konva.Image.fromURL('/assets/darth-vader.jpg',function (darthNode) {
        darthNode.setAttrs({
          x: 200,scaleX: 0.5,scaleY: 0.5,});
        layer.add(darthNode);
        layer.batchDraw();
      });
    </script>
  </body>
</html>

有没有办法在允许调整大小的同时保持纵横比，我可以在文本上添加纵横比，但不能在图像上添加纵横比？