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| <template>
<view class="publish">
<video></video>
<canvas class="canvas"></canvas>
<view class="" style="display: flex; flex-direction: column; align-items: center">
<button type="primary" @click="setImage">拍照</button>
<view class="img_bg_camera" v-if="imgSrc">
<image :src="imgSrc" class="tx_img" mode="aspectFit" />
</view>
<button type="primary" @click="OpenCamera">打开摄像头</button>
<button type="primary" @click="CloseCamera">关闭摄像头</button>
</view>
</view>
</template>
<script>
export default {
data() {
return {
mediaStreamTrack: {},
video_stream: '', // 视频stream
imgSrc: '', // 拍照图片
context: null,
video: null,
canvasw: 300,
canvash: 200,
canvas: null
}
},
mounted() {
this.video = document.querySelector('video')
this.canvas = document.querySelector('canvas')
this.context = this.canvas.getContext('2d')
// this.context = uni.createCanvasContext('canvasCamera')
// 进入页面 自动调用摄像头
this.getCamera()
// this.widthHeight()
},
methods: {
widthHeight() {
let w = this.canvas.offsetWidth
let h = this.canvas.offsetHeight
this.canvash = h
this.canvasw = w
},
// 调用打开摄像头功能
getCamera() {
// 老的浏览器可能根本没有实现 mediaDevices，所以我们可以先设置一个空的对象
if (navigator.mediaDevices === undefined) {
navigator.mediaDevices = {}
}
// 一些浏览器部分支持 mediaDevices。我们不能直接给对象设置 getUserMedia
// 因为这样可能会覆盖已有的属性。这里我们只会在没有 getUserMedia 属性的时候添加它。
if (navigator.mediaDevices.getUserMedia === undefined) {
navigator.mediaDevices.getUserMedia = function (constraints) {
// 首先，如果有 getUserMedia 的话，就获得它
var getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia
// 一些浏览器根本没实现它 - 那么就返回一个 error 到 promise 的 reject 来保持一个统一的接口
if (!getUserMedia) {
return Promise.reject(new Error('getUserMedia is not implemented in this browser'))
}
// 否则，为老的 navigator.getUserMedia 方法包裹一个 Promise
return new Promise(function (resolve, reject) {
getUserMedia.call(navigator, constraints, resolve, reject)
})
}
}
navigator.mediaDevices
.getUserMedia({ video: { width: this.canvasw, height: this.canvash } })
.then(stream => {
// 旧的浏览器可能没有 srcObject
if ('srcObject' in this.video) {
this.video.srcObject = stream
} else {
// 防止在新的浏览器里使用它，应为它已经不再支持了
this.video.src = window.URL.createObjectURL(stream)
}
this.video.play()
})
.catch(function (err) {
console.log(err.name + ': ' + err.message)
})
},
// 打开摄像头
OpenCamera() {
uni.showToast({
title: '打开摄像头'
})
console.log('打开摄像头')
this.getCamera()
},
// 关闭摄像头
CloseCamera() {
uni.showToast({
title: '关闭摄像头'
})
console.log('关闭摄像头')
this.video.srcObject.getTracks()[0].stop()
},
// 拍照 绘制图片
setImage() {
this.context.drawImage(this.video, 0, 0, this.canvasw, this.canvash)
const image = this.canvas.toDataURL('image/png')
this.imgSrc = image
console.log(image)
},
}
}
</script>
<style lang="scss" scoped>
video {
width: 100%;
height: 400rpx;
}
.canvas {
width: 600rpx;
height: 400rpx;
position: fixed;
top: 0;
left: -640rpx;
}
button {
width: 100px;
margin-top: 10px;
border-radius: 30px;
font-size: 14px;
}
.img_bg_camera {
margin-top: 20rpx;
img {
width: 400rpx;
height: 200rpx;
}
}
</style>
|
