<template>
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<view class="canvasBox">
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<template v-if="isUse">
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<view class="box">
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<view class="line"></view>
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<view class="angle"></view>
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</view>
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<view class="box2" v-if="isUseTorch">
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<view class="track" @click="openTrack">
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<svg
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t="1653920715959"
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class="icon"
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viewBox="0 0 1024 1024"
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version="1.1"
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xmlns="http://www.w3.org/2000/svg"
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p-id="1351"
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width="32"
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height="32"
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>
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<path
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d="M651.353043 550.479503H378.752795L240.862609 364.315031c-3.688944-4.897391-5.660621-10.876025-5.660621-17.045466v-60.040745c0-15.773416 12.847702-28.621118 28.621118-28.621118h502.459627c15.773416 0 28.621118 12.847702 28.621118 28.621118v59.977143c0 6.105839-1.971677 12.084472-5.660621 17.045466l-137.890187 186.228074zM378.752795 598.308571v398.024348c0 15.328199 12.402484 27.667081 27.667081 27.667081h217.266087c15.328199 0 27.667081-12.402484 27.66708-27.667081V598.308571H378.752795z m136.300124 176.942112c-14.564969 0-26.331429-11.76646-26.331428-26.331428v-81.283975c0-14.564969 11.76646-26.331429 26.331428-26.331429 14.564969 0 26.331429 11.76646 26.331429 26.331429v81.283975c0 14.564969-11.76646 26.331429-26.331429 26.331428zM512 222.608696c-17.554286 0-31.801242-14.246957-31.801242-31.801243V31.801242c0-17.554286 14.246957-31.801242 31.801242-31.801242s31.801242 14.246957 31.801242 31.801242v159.006211c0 17.554286-14.246957 31.801242-31.801242 31.801243zM280.932174 205.881242c-9.47677 0-18.889938-4.197764-25.122981-12.275279L158.242981 67.991056a31.864845 31.864845 0 0 1 5.597019-44.648944 31.864845 31.864845 0 0 1 44.648944 5.597018l97.502609 125.551305a31.864845 31.864845 0 0 1-5.597019 44.648944c-5.787826 4.579379-12.656894 6.741863-19.46236 6.741863zM723.987081 205.881242c-6.805466 0-13.674534-2.162484-19.462361-6.678261a31.794882 31.794882 0 0 1-5.597018-44.648944l97.566211-125.551304a31.794882 31.794882 0 0 1 44.648944-5.597019 31.794882 31.794882 0 0 1 5.597019 44.648944l-97.566211 125.551305c-6.360248 8.077516-15.709814 12.27528-25.186584 12.275279z"
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fill="#ffffff"
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p-id="1352"
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></path>
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</svg>
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{{ trackStatus ? '关闭闪光灯' : '打开闪光灯' }}
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</view>
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</view>
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<view class="mask1 mask" :style="'height:' + maskHeight + 'px;'"></view>
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<view
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class="mask2 mask"
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:style="'width:' + maskWidth + 'px;top:' + maskHeight + 'px;height:' + canvasHeight + 'px'"
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></view>
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<view class="mask3 mask" :style="'height:' + maskHeight + 'px;'"></view>
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<view
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class="mask4 mask"
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:style="'width:' + maskWidth + 'px;top:' + maskHeight + 'px;height:' + canvasHeight + 'px'"
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></view>
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</template>
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<template v-else>
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<slot name="error">
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<view class="error">
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<view class="on1">相机权限被拒绝，请尝试如下操作：</view>
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<view>· 刷新页面后重试；</view>
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<view>· 在系统中检测当前App或浏览器的相机权限是否被禁用；</view>
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<view>· 如果依然不能体验，建议在微信中打开链接；</view>
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</view>
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</slot>
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</template>
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</view>
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</template>
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<script>
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import jsQR from './jsQR.js'
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export default {
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props: {
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continue: {
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type: Boolean,
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default: false // false 监听一次 true 持续监听
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},
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exact: {
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type: String,
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default: 'environment' // environment 后摄像头 user 前摄像头
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},
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size: {
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type: String,
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default: 'whole' // whole 全屏 balf 半屏
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},
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definition: {
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type: Boolean,
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default: false // fasle 正常 true 高清
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}
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},
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data() {
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return {
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windowWidth: 0,
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windowHeight: 0,
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video: null,
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canvas2d: null,
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canvas2d2: null,
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canvasWidth: 200,
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canvasHeight: 200,
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maskWidth: 0,
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maskHeight: 0,
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inter: 0,
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track: null,
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isUseTorch: false,
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trackStatus: false,
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isParse: false,
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isUse: true
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}
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},
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mounted() {
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if (origin.indexOf('https') === -1) throw '请在 https 环境中使用摄像头组件。'
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this.windowWidth = document.documentElement.clientWidth || document.body.clientWidth
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this.windowHeight = document.documentElement.clientHeight || document.body.clientHeight
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this.windowHeight = this.size === 'whole' ? this.windowHeight : this.windowHeight / 2
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this.isParse = true
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this.$nextTick(() => {
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this.createMsk()
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this.openScan()
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})
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},
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destroyed() {
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this.closeCamera()
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},
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methods: {
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openScan() {
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const width = this.transtion(this.windowHeight)
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const height = this.transtion(this.windowWidth)
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const videoParam = {
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audio: false,
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video: {
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facingMode: { exact: this.exact },
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width,
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height
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}
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}
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navigator.mediaDevices
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.getUserMedia(videoParam)
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.then(stream => {
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this.video = document.createElement('video')
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this.video.width = this.windowWidth
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this.video.height = this.windowHeight
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const canvas = document.createElement('canvas')
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canvas.id = 'canvas'
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canvas.width = this.transtion(this.canvasWidth)
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canvas.height = this.transtion(this.canvasHeight)
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canvas.style = 'display:none;'
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//canvas.style = 'position: fixed;top: 0;z-index: 999;left:0'
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this.canvas2d = canvas.getContext('2d')
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// 设置当前宽高 满屏
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const canvasBox = document.querySelector('.canvasBox')
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canvasBox.append(this.video)
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canvasBox.append(canvas)
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canvasBox.style = `width:${this.windowWidth}px;height:${this.windowHeight}px;`
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// 创建第二个canvas
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const canvas2 = document.createElement('canvas')
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canvas2.id = 'canvas2'
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canvas2.width = this.canvasWidth
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canvas2.height = this.canvasHeight
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canvas2.style = 'position: absolute;top: 50%;left: 50%;z-index: 20;transform: translate(-50%, -50%);'
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this.canvas2d2 = canvas2.getContext('2d')
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canvasBox.append(canvas2)
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this.video.srcObject = stream
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this.video.setAttribute('playsinline', true)
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this.video.play()
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this.tick()
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this.track = stream.getVideoTracks()[0]
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setTimeout(() => {
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this.isUseTorch = this.track.getCapabilities().torch || null
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}, 500)
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})
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.catch(err => {
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this.isUse = false
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this.$emit('error', err)
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})
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},
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closeCamera() {
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this.isParse = false
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if (this.video && this.video.srcObject) {
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this.video.srcObject.getTracks().forEach(track => {
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track.stop()
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})
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}
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},
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tick() {
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if (!this.isParse) return
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if (this.video.readyState === this.video.HAVE_ENOUGH_DATA) {
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this.canvas2d.drawImage(
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this.video,
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this.transtion(this.maskWidth),
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this.transtion(this.maskHeight),
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this.transtion(200),
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this.transtion(200),
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0,
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0,
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this.transtion(this.canvasWidth),
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this.transtion(this.canvasHeight)
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)
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const imageData = this.canvas2d.getImageData(
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0,
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0,
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this.transtion(this.canvasWidth),
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this.transtion(this.canvasHeight)
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)
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const code = jsQR(imageData.data, imageData.width, imageData.height, {
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inversionAttempts: 'dontInvert'
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})
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this.canvas2d2.clearRect(0, 0, this.canvasWidth, this.canvasHeight)
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if (code) {
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this.drawLine(code.location.topLeftCorner, code.location.topRightCorner)
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this.drawLine(code.location.topRightCorner, code.location.bottomRightCorner)
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this.drawLine(code.location.bottomRightCorner, code.location.bottomLeftCorner)
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this.drawLine(code.location.bottomLeftCorner, code.location.topLeftCorner)
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if (code.data) {
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this.getData(code.data)
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}
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}
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}
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requestAnimationFrame(this.tick)
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},
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drawLine(begin, end, color = '#FF3B58') {
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this.canvas2d2.beginPath()
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this.canvas2d2.moveTo(this.nutranstion(begin.x), this.nutranstion(begin.y))
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this.canvas2d2.lineTo(this.nutranstion(end.x), this.nutranstion(end.y))
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this.canvas2d2.lineWidth = 4
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this.canvas2d2.strokeStyle = color
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this.canvas2d2.stroke()
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},
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getData(data) {
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this.$emit('success', data)
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if (!this.continue) {
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this.closeCamera()
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}
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},
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openTrack() {
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this.trackStatus = !this.trackStatus
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this.track.applyConstraints({
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advanced: [{ torch: this.trackStatus }]
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})
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},
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createMsk() {
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this.maskWidth = this.windowWidth / 2 - this.canvasWidth / 2
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this.maskHeight = this.windowHeight / 2 - this.canvasHeight / 2
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},
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transtion(number) {
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return this.definition ? number * 2.8 : number * 1.8
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},
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nutranstion(number) {
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return this.definition ? number / 2.8 : number / 1.8
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}
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}
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}
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</script>
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<style scoped>
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page {
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background-color: #333333;
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}
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.canvasBox {
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width: 100vw;
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height: 100vh;
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position: relative;
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background-image: linear-gradient(
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0deg,
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transparent 24%,
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rgba(32, 255, 77, 0.1) 25%,
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rgba(32, 255, 77, 0.1) 26%,
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transparent 27%,
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transparent 74%,
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rgba(32, 255, 77, 0.1) 75%,
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rgba(32, 255, 77, 0.1) 76%,
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transparent 77%,
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transparent
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),
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linear-gradient(
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90deg,
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transparent 24%,
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rgba(32, 255, 77, 0.1) 25%,
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rgba(32, 255, 77, 0.1) 26%,
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transparent 27%,
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transparent 74%,
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rgba(32, 255, 77, 0.1) 75%,
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rgba(32, 255, 77, 0.1) 76%,
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transparent 77%,
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transparent
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);
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background-size: 3rem 3rem;
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background-position: -1rem -1rem;
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z-index: 10;
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background-color: #1110;
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}
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.box {
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width: 200px;
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height: 200px;
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position: absolute;
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left: 50%;
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top: 50%;
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transform: translate(-50%, -50%);
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overflow: hidden;
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border: 0.1rem solid rgba(0, 255, 51, 0.2);
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z-index: 11;
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}
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.line {
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height: calc(100% - 2px);
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width: 100%;
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background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
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border-bottom: 3px solid #00ff33;
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transform: translateY(-100%);
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animation: radar-beam 2s infinite alternate;
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animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
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animation-delay: 1.4s;
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}
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.box:after,
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.box:before,
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.angle:after,
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.angle:before {
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content: '';
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display: block;
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position: absolute;
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width: 3vw;
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height: 3vw;
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z-index: 12;
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border: 0.2rem solid transparent;
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}
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.box:after,
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.box:before {
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top: 0;
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border-top-color: #00ff33;
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}
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.angle:after,
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.angle:before {
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bottom: 0;
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border-bottom-color: #00ff33;
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}
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.box:before,
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.angle:before {
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left: 0;
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border-left-color: #00ff33;
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}
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.box:after,
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.angle:after {
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right: 0;
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border-right-color: #00ff33;
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}
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@keyframes radar-beam {
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0% {
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transform: translateY(-100%);
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}
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100% {
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transform: translateY(0);
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}
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}
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.msg {
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text-align: center;
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padding: 20rpx 0;
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}
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.box2 {
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width: 300px;
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height: 200px;
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position: absolute;
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left: 50%;
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top: 50%;
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transform: translate(-50%, -50%);
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z-index: 20;
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}
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.track {
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position: absolute;
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bottom: -100px;
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left: 50%;
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transform: translateX(-50%);
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z-index: 20;
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color: #fff;
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display: flex;
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flex-direction: column;
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align-items: center;
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}
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.mask {
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position: absolute;
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z-index: 10;
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background-color: rgba(0, 0, 0, 0.55);
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}
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.mask1 {
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top: 0;
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left: 0;
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right: 0;
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}
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.mask2 {
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right: 0;
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}
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.mask3 {
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right: 0;
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left: 0;
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bottom: 0;
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}
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.mask4 {
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left: 0;
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}
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.error {
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color: #fff;
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padding: 40rpx;
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font-size: 24rpx;
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background-color: #333333;
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position: fixed;
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top: 50%;
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left: 50%;
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transform: translate(-50%, -50%);
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width: 550rpx;
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border-radius: 20rpx;
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}
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.error .on1 {
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font-size: 30rpx;
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}
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</style>
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