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最新推荐文章于 2024-06-14 09:44:02 发布

原创最新推荐文章于 2024-06-14 09:44:02 发布 · 1.2k 阅读

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<!DOCTYPE html>
<html>
<head>
<title>WaterMark证件水印</title>
<meta name="水印" http-equiv="Content-Type" content="WaterMark; charset=utf-8" />
<style type="text/css">
#waterMark {
	border: 6px solid;
	border-color: #686de0;
	box-shadow: 10px 10px 5px #95afc0;
}
#fontSize {
	width: 50px;
}
#srcPic {
	border: 2px solid;
	border-color: #686de0;
}
.btn{
	border-radius: 25px;
}
</style>
</head>
<body>
<h1 align="center">WaterMark</h1>
<h2 align="center">给数码证件加上水印</h2>
<div align="center">
  <input type="file" id="srcPic" accept="image/png" />
  <p>水印文本
  <input type="text" id="waterText" value="输入文本 他用无效">
  </p>
  <div>
  <p>旋转角度
  <input type="range" id="waterAngle" value ="20" min="0" max="360" >
  </p>
  <p>透明程度
  <input type="range" id="waterAlpha" value ="0.3" min="0" max="1" step="0.1">
  </p>
  </div>
  尺寸颜色
  <input type="number" id="fontSize" value ="20">
  <input type="color" id="waterColor" value ="#FFC125">
</div>
</br>
<div align="center">
  <button type="botton" id="btn-onload" onclick="Onload()" class="btn">加载图片</button>
  <button type="button" id="btn-print" onclick="printWater()" class="btn"> 添加水印 </button>
  <button type="button" id="btn-clear" onclick="clearPrint()" class="btn"> 清空画布 </button>
  <a id="download" href="javascript:(function(){alert('图片未完成');})();" download="waterMarked"><button class="btn">保存图片</button></a>
</div>
<div align="center">
  <canvas id="waterMark" width="320" height="240"></canvas>
</div>
  <script>
    //获取元素访问
	var waterImg=document.getElementById("waterMark");
	var waterText = document.getElementById("waterText");
	var fontSize = document.getElementById("fontSize");
	var waterAngle=document.getElementById("waterAngle");
	var waterAlpha=document.getElementById("waterAlpha");
	var waterColor=document.getElementById("waterColor");
	var srcPic=document.getElementById("srcPic");
	var download=document.getElementById("download");
	//获取画布访问
	var ctx = waterImg.getContext("2d");
	
	function printWater() {	
	
		//获取水印属性
		ctx.fillStyle = waterColor.value; //颜色
		ctx.globalAlpha = waterAlpha.value; //透明度
		ctx.font = `${fontSize.value}px Arial`; //字体
	
		angle = waterAngle.value*Math.PI/180; //旋转角度
	
		//获取画布大小
		cvsHeight = waterImg.height*1.4;
		cvsWidth = waterImg.width*1.4;
		xGap = fontSize.value*waterText.value.length
		yGap = fontSize.value*2
		
		//密铺水印
		ctx.rotate(angle);
		var x,y;
		for(x=-cvsWidth;x<=cvsWidth;x+=(xGap)) {
		for(y=-cvsHeight;y<=cvsHeight;y+=(yGap)) {
			ctx.fillText(waterText.value,x,y);
		}}
		ctx.rotate(-angle);
		save();
	}
	
	function clearPrint() {
		ctx.clearRect(0, 0, waterImg.width, waterImg.height);
	}
	
	function Onload() {
		//将图片转为base64码进行加载
        var imgFile = new FileReader();  
        imgFile.readAsDataURL(srcPic.files[0]);  
        imgFile.onload = function () {  
        var img = new Image()
		img.src = this.result;
		img.onload = function(){
			waterImg.width=img.width;
			waterImg.height=img.height;
			ctx.drawImage(img,0,0);
		}
	}}
	
	function save() {
		var finalResult = waterImg.toDataURL('waterMarked/png');
		download.href=finalResult;
	}
  </script>
</body>
</html>