uniapp中如何实现手势密码功能

<template><view class="container"><canvas ref="gestureCanvas" canvas-id="gestureCanvas" :style="{ width: '100%', height: '100%' }"></canvas></view></template><script>export default {  onLoad() {    const query = uni.createSelectorQuery().in(this);    query.select('.container')      .boundingClientRect((res) => {        const canvasWidth = res.width;        const canvasHeight = res.height;        this.canvasWidth = canvasWidth;        this.canvasHeight = canvasHeight;        this.ctx = uni.createCanvasContext('gestureCanvas');        // 绘制初始画面        this.drawBackground();      })      .exec();  },  methods: {    // 绘制背景    drawBackground() {      this.ctx.setFillStyle('#F5F5F5');      this.ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight);      this.ctx.draw();    },  },};</script><style>.container {  width: 100vw;  height: 100vh;}</style>

methods: {  // ...  // 手指按下事件  onTouchStart(event) {    const touch = event.touches[0];    const startX = touch.clientX;    const startY = touch.clientY;    // ...  },  // 手指移动事件  onTouchMove(event) {    const touch = event.touches[0];    const moveX = touch.clientX;    const moveY = touch.clientY;    // ...  },  // 手指松开事件  onTouchEnd() {    // ...  },},

methods: {  // ...  // 绘制手势路径  drawGesturePath() {    this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight);    this.drawBackground();        // ...    this.ctx.setStrokeStyle('#337ab7');    this.ctx.setLineWidth(3);    this.ctx.setLineCap('round');    this.ctx.setLineJoin('round');    for (let i = 0; i <p>在上述代码中，我们在drawGesturePath方法中，首先使用this.ctx.clearRect()方法来清空canvas上的内容，然后调用drawBackground方法来绘制灰色背景。接下来，我们使用this.ctx.setStrokeStyle()方法设置线条的颜色，使用this.ctx.setLineWidth()方法设置线条的宽度，使用this.ctx.setLineCap()方法设置线条的端点样式，使用this.ctx.setLineJoin()方法设置线条的连接处样式。然后，通过遍历gesturePath数组，依次绘制手势路径的各个线段。最后，使用this.ctx.draw(true)方法来将绘制的内容实时显示在canvas上。</p><ol start="4"><li>完整的手势密码功能实现</li></ol><p>最后，我们将前面的代码整合在一起，即可实现完整的手势密码功能。在GestureLock.vue文件中，添加如下代码：</p><pre class="brush:php;toolbar:false;"><template><view class="container"><canvas ref="gestureCanvas" canvas-id="gestureCanvas" :style="{ width: '100%', height: '100%' }"></canvas></view></template><script>export default {  data() {    return {      canvasWidth: 0,      canvasHeight: 0,      ctx: null,      startX: 0,      startY: 0,      moveX: 0,      moveY: 0,      gesturePath: [], // 手势路径的点集合    };  },  onLoad() {    const query = uni.createSelectorQuery().in(this);    query.select('.container')      .boundingClientRect((res) => {        const canvasWidth = res.width;        const canvasHeight = res.height;        this.canvasWidth = canvasWidth;        this.canvasHeight = canvasHeight;        this.ctx = uni.createCanvasContext('gestureCanvas');        // 绘制初始画面        this.drawBackground();      })      .exec();  },  methods: {    // 绘制背景    drawBackground() {      this.ctx.setFillStyle('#F5F5F5');      this.ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight);      this.ctx.draw();    },    // 手指按下事件    onTouchStart(event) {      const touch = event.touches[0];      this.startX = touch.clientX;      this.startY = touch.clientY;      this.gesturePath.push({ x: this.startX, y: this.startY });    },    // 手指移动事件    onTouchMove(event) {      const touch = event.touches[0];      this.moveX = touch.clientX;      this.moveY = touch.clientY;      this.gesturePath.push({ x: this.moveX, y: this.moveY });      this.drawGesturePath();    },    // 手指松开事件    onTouchEnd() {      // 进行手势密码的验证      console.log(this.gesturePath);    },    // 绘制手势路径    drawGesturePath() {      this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight);      this.drawBackground();      this.ctx.setStrokeStyle('#337ab7');      this.ctx.setLineWidth(3);      this.ctx.setLineCap('round');      this.ctx.setLineJoin('round');      for (let i = 0; i < this.gesturePath.length - 1; i++) {        const pointA = this.gesturePath[i];        const pointB = this.gesturePath[i + 1];        this.ctx.beginPath();        this.ctx.moveTo(pointA.x, pointA.y);        this.ctx.lineTo(pointB.x, pointB.y);        this.ctx.stroke();      }      this.ctx.draw(true);    },  },};</script><style>.container {  width: 100vw;  height: 100vh;}</style>