Vue中如何实现图片的马赛克效果？

npm install canvas

<template>
  <div>
    <canvas ref="canvas" style="display: none;"></canvas>
    <img ref="image" :src="imageUrl" @load="processImage" />
  </div>
</template>

<script>
export default {
  name: "MosaicImage",
  props: {
    imageUrl: {
      type: String,
      required: true
    },
    pixelSize: {
      type: Number,
      default: 10
    }
  },
  mounted() {
    this.canvas = this.$refs.canvas;
    this.image = this.$refs.image;
    this.context = this.canvas.getContext("2d");
  },
  methods: {
    processImage() {
      this.canvas.width = this.image.width;
      this.canvas.height = this.image.height;
      
      this.context.drawImage(this.image, 0, 0);
      
      const imageData = this.context.getImageData(
        0,
        0,
        this.canvas.width,
        this.canvas.height
      );
      
      for (let x = 0; x < imageData.width; x += this.pixelSize) {
        for (let y = 0; y < imageData.height; y += this.pixelSize) {
          const pixelData = this.getAveragePixel(
            imageData,
            x,
            y,
            this.pixelSize,
            this.pixelSize
          );
          
          this.setPixelData(imageData, pixelData, x, y, this.pixelSize, this.pixelSize);
        }
      }
      
      this.context.putImageData(imageData, 0, 0);
      
      const mosaicImageUrl = this.canvas.toDataURL();
      this.$emit("mosaicImageGenerated", mosaicImageUrl);
    },
    getAveragePixel(imageData, x, y, width, height) {
      let totalR = 0;
      let totalG = 0;
      let totalB = 0;
      
      for (let i = x; i < x + width; i++) {
        for (let j = y; j < y + height; j++) {
          const pixelOffset = (j * imageData.width + i) * 4;
          totalR += imageData.data[pixelOffset];
          totalG += imageData.data[pixelOffset + 1];
          totalB += imageData.data[pixelOffset + 2];
        }
      }
      
      const pixelCount = width * height;
      const averageR = Math.floor(totalR / pixelCount);
      const averageG = Math.floor(totalG / pixelCount);
      const averageB = Math.floor(totalB / pixelCount);
      
      return [averageR, averageG, averageB, 255];
    },
    setPixelData(imageData, pixelData, x, y, width, height) {
      for (let i = x; i < x + width; i++) {
        for (let j = y; j < y + height; j++) {
          const pixelOffset = (j * imageData.width + i) * 4;
          imageData.data[pixelOffset] = pixelData[0];
          imageData.data[pixelOffset + 1] = pixelData[1];
          imageData.data[pixelOffset + 2] = pixelData[2];
          imageData.data[pixelOffset + 3] = pixelData[3];
        }
      }
    }
  }
};
</script>

<template>
  <div>
    <mosaic-image :image-url="imageUrl" :pixel-size="10" @mosaic-image-generated="handleMosaicImageGenerated"></mosaic-image>
    <img :src="mosaicImageUrl" />
  </div>
</template>

<script>
import MosaicImage from "@/components/MosaicImage.vue";

export default {
  name: "App",
  components: {
    MosaicImage
  },
  data() {
    return {
      imageUrl: "path/to/your/image",
      mosaicImageUrl: ""
    };
  },
  methods: {
    handleMosaicImageGenerated(url) {
      this.mosaicImageUrl = url;
    }
  }
};
</script>