如何利用Vue实现图片的马赛克和涂鸦功能？

npm install vue-konva

<template>  <div>    @@##@@    <canvas ref="canvas" @mousedown="handleMouseDown" @mousemove="handleMouseMove" @mouseup="handleMouseUp"></canvas>    <v-stage ref="stage">      <v-layer>        <v-image ref="image" :image="loadedImage" />        <v-line ref="line" />      </v-layer>    </v-stage>  </div></template><script>import Vue from 'vue'import VueKonva from 'vue-konva'Vue.use(VueKonva)export default {  data() {    return {      imageUrl: '',       // 图片地址      loadedImage: null,  // 加载后的图片对象      isDrawing: false,   // 是否在涂鸦中      lastPointerPosition: { x: 0, y: 0 }  // 上一个鼠标指针的位置    }  },  methods: {    handleImageLoad() {      const image = new Image()      image.src = this.imageUrl      image.onload = () => {        this.loadedImage = image        this.$refs.stage.getStage().batchDraw()      }    },    handleMouseDown(e) {      this.isDrawing = true      this.lastPointerPosition = this.getRelativePosition(e)      this.$refs.line.points([this.lastPointerPosition.x, this.lastPointerPosition.y])      this.$refs.stage.getStage().batchDraw()    },    handleMouseMove(e) {      if (!this.isDrawing) {        return      }      const newPointerPosition = this.getRelativePosition(e)      const points = this.$refs.line.points()      const newPoints = points.concat([newPointerPosition.x, newPointerPosition.y])      this.$refs.line.points(newPoints)      this.$refs.stage.getStage().batchDraw()      this.lastPointerPosition = newPointerPosition    },    handleMouseUp() {      this.isDrawing = false    },    getRelativePosition(e) {      const stage = this.$refs.stage.getStage().container()      const pos = stage.getBoundingClientRect()      return {        x: e.clientX - pos.left,        y: e.clientY - pos.top      }    }  },  mounted() {    const canvas = this.$refs.canvas    const context = canvas.getContext('2d')    const image = new Image()    image.src = this.imageUrl    image.onload = () => {      canvas.width = image.width      canvas.height = image.height      context.drawImage(image, 0, 0, image.width, image.height)    }  }}</script>