uniapp调用相机 组件

引用地址 HBuilder X插件市场 何木木

<template>
    <view class="canvasBox">
        <template v-if="isUse">
            <view class="box">
                <view class="line"></view>
                <view class="angle"></view>
            </view>
            <view class="box2" v-if="isUseTorch">
                <view class="track" @click="openTrack">
                    <svg
                        t="1653920715959"
                        class="icon"
                        viewBox="0 0 1024 1024"
                        version="1.1"
                        xmlns="http://www.w3.org/2000/svg"
                        p-id="1351"
                        width="32"
                        height="32"
                    >
                        <path
                            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"
                            fill="#ffffff"
                            p-id="1352"
                        ></path>
                    </svg>
                    {{ trackStatus ? '关闭闪光灯' : '打开闪光灯' }}
                </view>
            </view>

            <view class="mask1 mask" :style="'height:' + maskHeight + 'px;'"></view>
            <view
                class="mask2 mask"
                :style="'width:' + maskWidth + 'px;top:' + maskHeight + 'px;height:' + canvasHeight + 'px'"
            ></view>
            <view class="mask3 mask" :style="'height:' + maskHeight + 'px;'"></view>
            <view
                class="mask4 mask"
                :style="'width:' + maskWidth + 'px;top:' + maskHeight + 'px;height:' + canvasHeight + 'px'"
            ></view>
        </template>
        <template v-else>
            <slot name="error">
                <view class="error">
                    <view class="on1">相机权限被拒绝，请尝试如下操作：</view>
                    <view>· 刷新页面后重试；</view>
                    <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>
                    <view>· 如果依然不能体验，建议在微信中打开链接；</view>
                </view>
            </slot>
        </template>
    </view>
</template>

<script>
import jsqr from "jsqr"

export default {
    name:'Mu',
    props: {
        continue: {
            type: Boolean,
            default: false // false 监听一次   true 持续监听
        },
        exact: {
            type: String,
            default: 'environment' // environment 后摄像头  user 前摄像头
        },
        size: {
            type: String,
            default: 'whole' // whole 全屏  balf 半屏
        },
        definition: {
            type: Boolean,
            default: false // fasle 正常  true 高清
        }
    },
    data() {
        return {
            windowWidth: 0,
            windowHeight: 0,
            video: null,
            canvas2d: null,
            canvas2d2: null,
            canvasWidth: 200,
            canvasHeight: 200,
            maskWidth: 0,
            maskHeight: 0,
            inter: 0,

            track: null,
            isUseTorch: false,
            trackStatus: false,

            isParse: false,
            isUse: true
        }
    },
    mounted() {
        if (origin.indexOf('https') === -1) throw '请在 https 环境中使用摄像头组件。'

        this.windowWidth = document.documentElement.clientWidth || document.body.clientWidth
        this.windowHeight = document.documentElement.clientHeight || document.body.clientHeight
        this.windowHeight = this.size === 'whole' ? this.windowHeight : this.windowHeight / 2
        this.isParse = true

        this.$nextTick(() => {
            this.createMsk()
            this.openScan()
        })
    },
    destroyed() {
        this.closeCamera()
    },
    methods: {
        openScan() {
            const width = this.transtion(this.windowHeight)
            const height = this.transtion(this.windowWidth)
            const videoParam = {
                audio: false,
                video: {
                    facingMode: { exact: this.exact },
                    width,
                    height
                }
            }
            navigator.mediaDevices
                .getUserMedia(videoParam)
                .then(stream => {
                    this.video = document.createElement('video')
                    this.video.width = this.windowWidth
                    this.video.height = this.windowHeight

                    const canvas = document.createElement('canvas')
                    canvas.id = 'canvas'
                    canvas.width = this.transtion(this.canvasWidth)
                    canvas.height = this.transtion(this.canvasHeight)
                    canvas.style = 'display:none;'
                    //canvas.style = 'position: fixed;top: 0;z-index: 999;left:0'
                    this.canvas2d = canvas.getContext('2d')

                    // 设置当前宽高 满屏
                    const canvasBox = document.querySelector('.canvasBox')
                    canvasBox.append(this.video)
                    canvasBox.append(canvas)
                    canvasBox.style = `width:${this.windowWidth}px;height:${this.windowHeight}px;`

                    // 创建第二个canvas
                    const canvas2 = document.createElement('canvas')
                    canvas2.id = 'canvas2'
                    canvas2.width = this.canvasWidth
                    canvas2.height = this.canvasHeight
                    canvas2.style = 'position: absolute;top: 50%;left: 50%;z-index: 20;transform: translate(-50%, -50%);'
                    this.canvas2d2 = canvas2.getContext('2d')
                    canvasBox.append(canvas2)

                    this.video.srcObject = stream
                    this.video.setAttribute('playsinline', true)
                    this.video.play()
                    this.tick()

                    this.track = stream.getVideoTracks()[0]
                    setTimeout(() => {
                        this.isUseTorch = this.track.getCapabilities().torch || null
                    }, 500)
                })
                .catch(err => {
                    this.isUse = false
                    this.$emit('error', err)
                })
        },

        closeCamera() {
            this.isParse = false
            if (this.video && this.video.srcObject) {
                this.video.srcObject.getTracks().forEach(track => {
                    track.stop()
                })
            }
        },

        tick() {
            if (!this.isParse) return
            if (this.video.readyState === this.video.HAVE_ENOUGH_DATA) {
                this.canvas2d.drawImage(
                    this.video,
                    this.transtion(this.maskWidth),
                    this.transtion(this.maskHeight),
                    this.transtion(200),
                    this.transtion(200),
                    0,
                    0,
                    this.transtion(this.canvasWidth),
                    this.transtion(this.canvasHeight)
                )

                const imageData = this.canvas2d.getImageData(
                    0,
                    0,
                    this.transtion(this.canvasWidth),
                    this.transtion(this.canvasHeight)
                )

                const code = jsQR(imageData.data, imageData.width, imageData.height, {
                    inversionAttempts: 'dontInvert'
                })

                this.canvas2d2.clearRect(0, 0, this.canvasWidth, this.canvasHeight)
                if (code) {
                    this.drawLine(code.location.topLeftCorner, code.location.topRightCorner)
                    this.drawLine(code.location.topRightCorner, code.location.bottomRightCorner)
                    this.drawLine(code.location.bottomRightCorner, code.location.bottomLeftCorner)
                    this.drawLine(code.location.bottomLeftCorner, code.location.topLeftCorner)
                    if (code.data) {
                        this.getData(code.data)
                    }
                }
            }
            requestAnimationFrame(this.tick)
        },
        drawLine(begin, end, color = '#FF3B58') {
            this.canvas2d2.beginPath()
            this.canvas2d2.moveTo(this.nutranstion(begin.x), this.nutranstion(begin.y))
            this.canvas2d2.lineTo(this.nutranstion(end.x), this.nutranstion(end.y))
            this.canvas2d2.lineWidth = 4
            this.canvas2d2.strokeStyle = color
            this.canvas2d2.stroke()
        },

        getData(data) {
            this.$emit('success', data)
            if (!this.continue) {
                this.closeCamera()
            }
        },

        openTrack() {
            this.trackStatus = !this.trackStatus
            this.track.applyConstraints({
                advanced: [{ torch: this.trackStatus }]
            })
        },

        createMsk() {
            this.maskWidth = this.windowWidth / 2 - this.canvasWidth / 2
            this.maskHeight = this.windowHeight / 2 - this.canvasHeight / 2
        },

        transtion(number) {
            return this.definition ? number * 2.8 : number * 1.8
        },
        nutranstion(number) {
            return this.definition ? number / 2.8 : number / 1.8
        }
    }
}
</script>

<style scoped>
page {
    background-color: #333333;
}

.canvasBox {
    width: 100vw;
    height: 100vh;
    position: relative;

    background-image: linear-gradient(
            0deg,
            transparent 24%,
            rgba(32, 255, 77, 0.1) 25%,
            rgba(32, 255, 77, 0.1) 26%,
            transparent 27%,
            transparent 74%,
            rgba(32, 255, 77, 0.1) 75%,
            rgba(32, 255, 77, 0.1) 76%,
            transparent 77%,
            transparent
        ),
        linear-gradient(
            90deg,
            transparent 24%,
            rgba(32, 255, 77, 0.1) 25%,
            rgba(32, 255, 77, 0.1) 26%,
            transparent 27%,
            transparent 74%,
            rgba(32, 255, 77, 0.1) 75%,
            rgba(32, 255, 77, 0.1) 76%,
            transparent 77%,
            transparent
        );
    background-size: 3rem 3rem;
    background-position: -1rem -1rem;
    z-index: 10;
    background-color: #1110;
}

.box {
    width: 200px;
    height: 200px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    overflow: hidden;
    border: 0.1rem solid rgba(0, 255, 51, 0.2);
    z-index: 11;
}

.line {
    height: calc(100% - 2px);
    width: 100%;
    background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
    border-bottom: 3px solid #00ff33;
    transform: translateY(-100%);
    animation: radar-beam 2s infinite alternate;
    animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
    animation-delay: 1.4s;
}

.box:after,
.box:before,
.angle:after,
.angle:before {
    content: '';
    display: block;
    position: absolute;
    width: 3vw;
    height: 3vw;
    z-index: 12;
    border: 0.2rem solid transparent;
}

.box:after,
.box:before {
    top: 0;
    border-top-color: #00ff33;
}

.angle:after,
.angle:before {
    bottom: 0;
    border-bottom-color: #00ff33;
}

.box:before,
.angle:before {
    left: 0;
    border-left-color: #00ff33;
}

.box:after,
.angle:after {
    right: 0;
    border-right-color: #00ff33;
}

@keyframes radar-beam {
    0% {
        transform: translateY(-100%);
    }

    100% {
        transform: translateY(0);
    }
}

.msg {
    text-align: center;
    padding: 20rpx 0;
}

.box2 {
    width: 300px;
    height: 200px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 20;
}

.track {
    position: absolute;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.mask {
    position: absolute;
    z-index: 10;
    background-color: rgba(0, 0, 0, 0.55);
}

.mask1 {
    top: 0;
    left: 0;
    right: 0;
}

.mask2 {
    right: 0;
}

.mask3 {
    right: 0;
    left: 0;
    bottom: 0;
}

.mask4 {
    left: 0;
}

.error {
    color: #fff;
    padding: 40rpx;
    font-size: 24rpx;
    background-color: #333333;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 550rpx;
    border-radius: 20rpx;
}

.error .on1 {
    font-size: 30rpx;
}
</style>