HTML5 Canvas 混合模式与 globalCompositeOperation 教程

globalCompositeOperation 文档。

使用 Konva 框架，您可以通过 globalCompositeOperation 属性设置 globalCompositeOperation 或混合模式操作。

说明：拖动红色矩形覆盖绿色文本，以查看异或混合效果。

Vanilla

import Konva from 'konva';

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

const layer = new Konva.Layer();

const text = new Konva.Text({
  text: '文本阴影！',
  fontFamily: 'Calibri',
  fontSize: 40,
  x: 20,
  y: 20,
  fill: 'green',
  shadowColor: 'white',
  shadowOffset: { x: 10, y: 10 }
});
layer.add(text);

const rect = new Konva.Rect({
  x: 50,
  y: 50,
  width: 100,
  height: 100,
  fill: 'red',
  draggable: true,
  globalCompositeOperation: 'xor'
});

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

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React

import { Stage, Layer, Text, Rect } from 'react-konva';

const App = () => {
  return (
    <Stage width={window.innerWidth} height={window.innerHeight}>
      <Layer>
        <Text
          text="文本阴影！"
          fontFamily="Calibri"
          fontSize={40}
          x={20}
          y={20}
          fill="green"
          shadowColor="white"
          shadowOffset={{ x: 10, y: 10 }}
        />
        <Rect
          x={50}
          y={50}
          width={100}
          height={100}
          fill="red"
          draggable={true}
          globalCompositeOperation="xor"
        />
      </Layer>
    </Stage>
  );
};

export default App;

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Vue

<template>
  <v-stage :config="stageSize">
    <v-layer>
      <v-text :config="textConfig" />
      <v-rect :config="rectConfig" />
    </v-layer>
  </v-stage>
</template>

<script setup>
const stageSize = {
  width: window.innerWidth,
  height: window.innerHeight
};

const textConfig = {
  text: '文本阴影！',
  fontFamily: 'Calibri',
  fontSize: 40,
  x: 20,
  y: 20,
  fill: 'green',
  shadowColor: 'white',
  shadowOffset: { x: 10, y: 10 }
};

const rectConfig = {
  x: 50,
  y: 50,
  width: 100,
  height: 100,
  fill: 'red',
  draggable: true,
  globalCompositeOperation: 'xor'
};
</script>

Open Sandbox