HTML5 Canvas Tween Finish Event Tutorial

To trigger a user defined function when the tween finishes with Konva, we can set the onFinish property.

Konva Tween Finish Event Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/[email protected]/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Finish Event Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script>
      function writeMessage(message) {
        text.text(message);
      }

      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 text = new Konva.Text({
        x: 10,
        y: 10,
        fontFamily: 'Calibri',
        fontSize: 24,
        text: '',
        fill: 'black',
      });

      var wheel = new Konva.Star({
        x: stage.width() / 2,
        y: stage.height() / 2,
        numPoints: 8,
        outerRadius: 70,
        innerRadius: 50,
        fill: 'purple',
        stroke: 'black',
        strokeWidth: 5,
        lineJoin: 'bevel',
      });

      layer.add(wheel);
      layer.add(text);
      stage.add(layer);

      // the tween has to be created after the node has been added to the layer
      var tween = new Konva.Tween({
        node: wheel,
        duration: 4,
        rotation: 360,
        easing: Konva.Easings.BackEaseOut,
        onFinish: function () {
          writeMessage('tween finished!');
        },
      });

      setTimeout(function () {
        tween.play();
      }, 1000);
    </script>
  </body>
</html>

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