线性补间动画

我们实例化Konva.Tween对象创建补间动画，然后执行play()运行动画。
任何数值类型的参数都可以用于补间动画，比方说 Shape,Group, Layer, 或者 Stage 的数值型属性： x, y, rotation,
width, height, radius, strokeWidth, opacity, scaleX, offsetX 等等。

点击Konva.Tween documentation查询详细的参数和方法。

Konva Tweening Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/konva@4.0.18/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Linear Easing 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();

      var rect = new Konva.Rect({
        x: 50,
        y: 20,
        width: 100,
        height: 50,
        fill: 'green',
        stroke: 'black',
        strokeWidth: 2,
        opacity: 0.2
      });

      layer.add(rect);
      stage.add(layer);

      // the tween has to be created after the node has been added to the layer
      var tween = new Konva.Tween({
        node: rect,
        duration: 1,
        x: 140,
        y: 90,
        fill: 'red',
        rotation: Math.PI * 2,
        opacity: 1,
        strokeWidth: 6,
        scaleX: 1.5
      });

      // start tween after 2 seconds
      setTimeout(function() {
        tween.play();
      }, 2000);
    </script>
  </body>
</html>