更多缓动函数教程

本教程演示 Konva 提供的所有缓动函数集合，包括：

• Linear
• Ease
• Back
• Elastic
• Bounce
• Strong

如需查看所有可用的缓动函数，请参阅缓动函数文档。

操作说明：按下“Play”，使用不同的缓动函数使所有文本节点完成过渡。

Vanilla

import Konva from 'konva';

const width = window.innerWidth;
const height = window.innerHeight;

const stage = new Konva.Stage({
container: 'container',
width: width,
height: height,
});

const layer = new Konva.Layer();

const easings = [
'Linear',
'EaseIn',
'EaseOut',
'EaseInOut',
'BackEaseIn',
'BackEaseOut',
'BackEaseInOut',
'ElasticEaseIn',
'ElasticEaseOut',
'ElasticEaseInOut',
'BounceEaseIn',
'BounceEaseOut',
'BounceEaseInOut',
'StrongEaseIn',
'StrongEaseOut',
'StrongEaseInOut',
];

const tweens = [];

easings.forEach((easing, i) => {
const text = new Konva.Text({
x: 50,
y: 30 + i * 25,
text: easing,
fontSize: 16,
fontFamily: 'Calibri',
fill: 'black',
});
layer.add(text);

tweens.push(
new Konva.Tween({
node: text,
duration: 2,
x: width - 200,
easing: Konva.Easings[easing],
})
);
});

stage.add(layer);

// create button
const button = document.createElement('button');
button.textContent = 'Play';
button.style.position = 'absolute';
button.style.top = '0px';
button.style.left = '0px';
button.addEventListener('click', () => {
tweens.forEach((tween) => {
tween.reset();
tween.play();
});
});
document.body.appendChild(button);

React

import Konva from 'konva';
import { Stage, Layer, Text } from 'react-konva';
import { useEffect, useRef } from 'react';

const App = () => {
  const tweensRef = useRef([]);
  const textsRef = useRef([]);

  const easings = [
    'Linear',
    'EaseIn',
    'EaseOut',
    'EaseInOut',
    'BackEaseIn',
    'BackEaseOut',
    'BackEaseInOut',
    'ElasticEaseIn',
    'ElasticEaseOut',
    'ElasticEaseInOut',
    'BounceEaseIn',
    'BounceEaseOut',
    'BounceEaseInOut',
    'StrongEaseIn',
    'StrongEaseOut',
    'StrongEaseInOut',
  ];

  useEffect(() => {
    tweensRef.current = textsRef.current.map((text, i) => {
      return new Konva.Tween({
        node: text,
        duration: 2,
        x: window.innerWidth - 200,
        easing: Konva.Easings[easings[i]],
      });
    });

    return () => {
      tweensRef.current.forEach((tween) => tween.destroy());
    };
  }, []);

  const handlePlay = () => {
    tweensRef.current.forEach((tween) => {
      tween.reset();
      tween.play();
    });
  };

  return (
    <>
      <button onClick={handlePlay}>Play</button>
      <Stage width={window.innerWidth} height={window.innerHeight}>
        <Layer>
          {easings.map((easing, i) => (
            <Text
              key={i}
              ref={(node) => {
                textsRef.current[i] = node;
              }}
              x={50}
              y={30 + i * 25}
              text={easing}
              fontSize={16}
              fontFamily="Calibri"
              fill="black"
            />
          ))}
        </Layer>
      </Stage>
    </>
  );
};

export default App;

Vue

<template>
  <div>
    <button @click="handlePlay">Play</button>
    <v-stage :config="stageSize">
      <v-layer>
        <v-text
          v-for="(easing, i) in easings"
          :key="i"
          :config="getTextConfig(easing, i)"
          :ref="el => textRefs[i] = el"
        />
      </v-layer>
    </v-stage>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue';
import Konva from 'konva';

const stageSize = {
  width: window.innerWidth,
  height: window.innerHeight
};

const easings = [
  'Linear',
  'EaseIn',
  'EaseOut',
  'EaseInOut',
  'BackEaseIn',
  'BackEaseOut',
  'BackEaseInOut',
  'ElasticEaseIn',
  'ElasticEaseOut',
  'ElasticEaseInOut',
  'BounceEaseIn',
  'BounceEaseOut',
  'BounceEaseInOut',
  'StrongEaseIn',
  'StrongEaseOut',
  'StrongEaseInOut',
];

const textRefs = ref([]);
let tweens = [];

const getTextConfig = (easing, i) => ({
  x: 50,
  y: 30 + i * 25,
  text: easing,
  fontSize: 16,
  fontFamily: 'Calibri',
  fill: 'black'
});

onMounted(() => {
  tweens = textRefs.value.map((ref, i) => {
    return new Konva.Tween({
      node: ref.getNode(),
      duration: 2,
      x: window.innerWidth - 200,
      easing: Konva.Easings[easings[i]]
    });
  });
});

const handlePlay = () => {
  tweens.forEach(tween => {
    tween.reset();
    tween.play();
  });
};
</script>