navigator.mediadevices.getusermedia在vue上实现拍照功能,视频分辨率1280*720
时间: 2024-06-12 09:06:02 浏览: 16
在Vue中实现拍照功能,可以使用HTML5的API navigator.mediaDevices.getUserMedia()来获取摄像头的视频流,然后使用Canvas来绘制视频帧,最后将Canvas转换为图像数据。
首先需要在Vue组件中引入Canvas元素,以及一个用于显示图像的img元素,如下所示:
```
<template>
<div>
<canvas ref="canvas" style="display:none;"></canvas>
<img ref="image" style="display:none;">
<button @click="takePhoto()">Take Photo</button>
</div>
</template>
```
然后在Vue组件的methods中定义takePhoto()方法,该方法会调用getUserMedia()方法获取摄像头的视频流,然后将视频帧绘制到Canvas上,最后将Canvas转换为图像数据并显示在img元素中,如下所示:
```
<script>
export default {
methods: {
takePhoto() {
navigator.mediaDevices.getUserMedia({ video: { width: 1280, height: 720 } })
.then(stream => {
const video = document.createElement('video');
video.srcObject = stream;
video.play();
const canvas = this.$refs.canvas;
const context = canvas.getContext('2d');
canvas.width = 1280;
canvas.height = 720;
context.drawImage(video, 0, 0, canvas.width, canvas.height);
const imageData = canvas.toDataURL('image/png');
const image = this.$refs.image;
image.src = imageData;
image.style.display = 'block';
video.pause();
stream.getTracks().forEach(track => {
track.stop();
});
})
.catch(error => {
console.error(error);
});
}
}
};
</script>
```
在takePhoto()方法中,首先调用getUserMedia()方法获取视频流,然后创建一个video元素,并将视频流赋给它的srcObject属性,然后播放视频。接着创建一个Canvas元素,并将视频帧绘制到Canvas上,然后将Canvas转换为图像数据,并显示在img元素中。最后暂停视频的播放,并停止所有的视频流轨道。
最后,在页面中添加一个按钮,当用户点击按钮时会调用takePhoto()方法来拍照,如下所示:
```
<template>
<div>
<canvas ref="canvas" style="display:none;"></canvas>
<img ref="image" style="display:none;">
<button @click="takePhoto()">Take Photo</button>
</div>
</template>
<script>
export default {
methods: {
takePhoto() {
navigator.mediaDevices.getUserMedia({ video: { width: 1280, height: 720 } })
.then(stream => {
const video = document.createElement('video');
video.srcObject = stream;
video.play();
const canvas = this.$refs.canvas;
const context = canvas.getContext('2d');
canvas.width = 1280;
canvas.height = 720;
context.drawImage(video, 0, 0, canvas.width, canvas.height);
const imageData = canvas.toDataURL('image/png');
const image = this.$refs.image;
image.src = imageData;
image.style.display = 'block';
video.pause();
stream.getTracks().forEach(track => {
track.stop();
});
})
.catch(error => {
console.error(error);
});
}
}
};
</script>
```
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