标题: HTML5 Canvas 简单缓动教程

要使用 Konva 创建非线性缓动动画，我们可以将 easing 属性设置为一个缓动函数。除了 Konva.Easings.Linear，其他最常见的缓动函数包括 Konva.Easings.EaseIn、Konva.Easings.EaseInOut 和 Konva.Easings.EaseOut。

有关所有可用的缓动函数，请访问 缓动文档。

说明：将鼠标悬停或触摸这些框以使用不同的缓动函数进行动画

Konva 简单缓动示例view raw
<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/konva@9.3.18/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Common 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 greenBox = new Konva.Rect({
        x: 70,
        y: stage.height() / 2,
        width: 100,
        height: 50,
        fill: 'green',
        stroke: 'black',
        strokeWidth: 4,
        offset: {
          x: 50,
          y: 25,
        },
      });

      var blueBox = new Konva.Rect({
        x: 190,
        y: stage.height() / 2,
        width: 100,
        height: 50,
        fill: 'blue',
        stroke: 'black',
        strokeWidth: 4,
        offset: {
          x: 50,
          y: 25,
        },
      });

      var redBox = new Konva.Rect({
        x: 310,
        y: stage.height() / 2,
        width: 100,
        height: 50,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4,
        offset: {
          x: 50,
          y: 25,
        },
      });

      layer.add(greenBox);
      layer.add(blueBox);
      layer.add(redBox);
      stage.add(layer);

      // the tween has to be created after the node has been added to the layer
      greenBox.tween = new Konva.Tween({
        node: greenBox,
        scaleX: 2,
        scaleY: 1.5,
        easing: Konva.Easings.EaseIn,
        duration: 1,
      });

      blueBox.tween = new Konva.Tween({
        node: blueBox,
        scaleX: 2,
        scaleY: 1.5,
        easing: Konva.Easings.EaseInOut,
        duration: 1,
      });

      redBox.tween = new Konva.Tween({
        node: redBox,
        scaleX: 2,
        scaleY: 1.5,
        easing: Konva.Easings.EaseOut,
        duration: 1,
      });

      // use event delegation
      layer.on('mouseover touchstart', function (evt) {
        evt.target.tween.play();
      });

      layer.on('mouseout touchend', function (evt) {
        evt.target.tween.reverse();
      });
    </script>
  </body>
</html>