要多簡單就有多簡單的H5拍照加水印

昵稱33363002 2016-10-12

展開全文

來一個簡單粗暴的gif演示圖

先來html 內(nèi)容

<video id='video' width='320' height='240' autoplay></video>
<button id='snap'>拍張照片唄</button>
<canvas id='canvas' width='320' height='240' ></canvas>

一個video 一個canvas

然后js內(nèi)容
把設(shè)備啟動下

init: function(){
    var video = this.video;
    if(navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
        navigator.mediaDevices.getUserMedia({ video: true }).then(function(stream) {
            video.src = window.URL.createObjectURL(stream);
            video.play();
        });
    }
    this.bind();
}

綁定下按鈕
按鈕獲取點擊時的幀，和添加一下水印

font: '14px microsoft yahei',
style: 'rgba(255,255,255,0.9)',
text: '有一個姑娘在coding',
height: 240,
width: 320,
draw_pic: function(){
    var self = this;
    var context = self.canvas.getContext('2d');
    context.drawImage(self.video, 0, 0, self.width, self.height);
    context.font = self.font;
    context.fillStyle = self.style;
    context.fillText(self.text, self.width - 140 , self.height - 10);
}

這樣就結(jié)束了
附上全部代碼

<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title>要多簡單就有多簡單的H5拍照加水印</title>
</head>
<style type='text/css'>
video,canvas{
  border: 1px solid #ccc;
}
</style>
<body>
    <video id='video' width='320' height='240' autoplay></video>
    <button id='snap'>拍張照片唄</button>
    <canvas id='canvas' width='320' height='240' ></canvas>
</body>
<script type='text/javascript'>

var camera = {
    video: document.getElementById('video'),
    canvas:  document.getElementById('canvas'),
    btn: document.getElementById('snap'),
    font: '14px microsoft yahei',
    style: 'rgba(255,255,255,0.9)',
    text: '有一個姑娘在coding',
    height: 240,
    width: 320,
    draw_pic: function(){
        var self = this;
        var context = self.canvas.getContext('2d');
        context.drawImage(self.video, 0, 0, self.width, self.height);
        context.font = self.font;
        context.fillStyle = self.style;
        context.fillText(self.text, self.width - 140 , self.height - 10);
    },
    bind: function(){
        var self = this;
        self.btn.addEventListener('click', function() {
            self.draw_pic();
        });
    },
    init: function(){
        var video = this.video;
        if(navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
            navigator.mediaDevices.getUserMedia({ video: true }).then(function(stream) {
                video.src = window.URL.createObjectURL(stream);
                video.play();
            });
        }
        this.bind();
    }
};

camera.init();

</script>
</html>