控制补间动画

我们可以使用play(), pause(), reverse(), reset(), finish(), seek()等方法，来控制补间动画。
下面的示例将演示各个控制器的效果。
All Tween Controlsview raw
<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/konva@4.0.18/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva All Controls Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
      #buttons {
        position: absolute;
        top: 5px;
        left: 10px;
      }
      #buttons > input {
        padding: 10px;
        display: inline-block;
        margin-right: 5px;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <div id="buttons">
      <input type="button" id="play" value="Play" />
      <input type="button" id="pause" value="Pause" />
      <input type="button" id="reverse" value="Reverse" />
      <input type="button" id="reset" value="Reset" />
      <input type="button" id="seek" value="Seek 3" />
      <input type="button" id="finish" value="Finish" />
    </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: 130,
        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: 6,
        x: 220,
        y: 75,
        rotation: Math.PI * 10,
        opacity: 1,
        strokeWidth: 6,
        scaleX: 1.3,
        scaleY: 1.3,
        easing: Konva.Easings.Linear,
        fillR: 0,
        fillG: 0,
        fillB: 255
      });

      // pause tween
      document.getElementById('pause').addEventListener(
        'click',
        function() {
          tween.pause();
        },
        false
      );

      // reverse tween
      document.getElementById('reverse').addEventListener(
        'click',
        function() {
          tween.reverse();
        },
        false
      );

      // play tween forward
      document.getElementById('play').addEventListener(
        'click',
        function() {
          tween.play();
        },
        false
      );

      // reset tween
      document.getElementById('reset').addEventListener(
        'click',
        function() {
          tween.reset();
        },
        false
      );

      // force tween to finish
      document.getElementById('finish').addEventListener(
        'click',
        function() {
          tween.finish();
        },
        false
      );

      // seek to 3 seconds
      document.getElementById('seek').addEventListener(
        'click',
        function() {
          tween.seek(3);
        },
        false
      );
    </script>
  </body>
</html>