How to achieve the mosaic effect of images in Vue?

How to achieve the mosaic effect of images in Vue?

The mosaic effect of pictures is a common image processing technique used to blur the details in the image, similar to the effect of a mosaic pattern. Implementing the mosaic effect of images in Vue can be accomplished using the Canvas element and some image processing algorithms. This article will introduce how to achieve this effect in a Vue project, with code examples.

1. Preparation work
   First, install the Canvas library in the Vue project, which can be installed using npm or yarn.

npm install canvas

2. Create a Vue component
   Create a new component in the Vue project, named "MosaicImage":

<template>
  <div>
    <canvas ref="canvas" style="display: none;"></canvas>
    <img  src="/static/imghw/default1.png"  data-src="imageUrl"  class="lazy"  ref="image" : @load="processImage" / alt="How to achieve the mosaic effect of images in Vue?" >
  </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>

3. Use "MosaicImage" component
   Use the "MosaicImage" component in the parent component of Vue and pass in the URL and pixel size of the image:

<template>
  <div>
    <mosaic-image :image-url="imageUrl" :pixel-size="10" @mosaic-image-generated="handleMosaicImageGenerated"></mosaic-image>
    <img  src="/static/imghw/default1.png"  data-src="mosaicImageUrl"  class="lazy"  : / alt="How to achieve the mosaic effect of images in Vue?" >
  </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>

In this way, when the image is loaded, "MosaicImage" The component will process the original image into a mosaic effect, pass the URL of the mosaic image to the parent component through the event "MosaicImageGenerated", and finally display the mosaic image in the parent component.

The above are the methods and code examples to achieve the image mosaic effect in Vue. You can adjust the pixel size and other parameters as needed to get different effects. I wish you success in achieving the mosaic effect of your pictures!

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