由于三方的报表软件做报表不错，可要做合同模板的有些功能实现不了。故用前端画html实现合同模板页面，一开始合同模板编辑后打印，用的浏览器的打印功能，后续因为电子签就引入了三方html转pdf的工具wkhtmltopdf。合同水印就需要同时兼容chrome浏览器打印和工具wkhtmltopdf转pdf后打印的效果。
各方案比较
| 方案 | 支持动态生成水印 | chrome浏览器打印 | wkhtmltopdf工具打印 |
|---|---|---|---|
| 第一阶段 | ✓ | ✓ | × |
| 第二阶段 | × | ✓ | ✓ |
| 第三阶段svg | ✓ | ✓ | × |
| 第三阶段canvas |
✓ | ✓ | ✓ |
*个人推荐：如果你没用wkhtmltopdf工具，选第三种、第四种都行；用了wkhtmltopdf工具，选第四种。
注：wkhtmltopdf由于最后的版本是2000年左右，之后好像没维护了。它内置的浏览器对es6及以上版本的js支持性比较差，尽量别用，不然会出现各种状况。
第一阶段：js动态添加多个文本标签
功能需求： 根据合同状态（合同草稿、已签约、已备案等等）生成对应的水印。
大体实现思路：根据页面的内容的宽高，每个水印的大小来动态生成一组水印标签，动态遍历添加到body里，通过样式的positon:absolute；控制每个水印标签位置。
代码参考：代码比较多，并且网上类似思路的文章不少，给个类似思路的参考链接：http://t.zoukankan.com/GongQi-p-4074609.html。
缺点： 在两种打印模式（chrome浏览器打印、工具wkhtmltopdf转pdf打印）中，任何一个合同都会有强制分页的情况（比如，合同封面、附件的每个附件单独提页等等），而一旦出现强制分页时，无论怎么获取合同页面的宽高都无法做到和打印页时一样的总高，导致最后几个打印页内容无合同水印，甚至水印重叠的问题。
第二阶段：纯css实现，background-repeat: repeat;实现多个水印
功能需求： 根据合同状态（合同草稿、已签约、已备案等等）生成对应的水印。（和第一阶段一致）
大体实现思路： 将所有可能的合同状态的水印枚举出来（合同草稿、已备案、已签约），然后让ui按指定尺寸设计成图片，然后将图片转成对应的base64码值，添加到样式里，用
background-repeat: repeat;实现多个水印。代码参考： 核心代码如下：
/*水印*/
.watermark{
display: none;
position: fixed;
z-index: -1;
left: 0;
top: 0;
width: 100%;
height: 100%;
background-repeat: repeat;
background-position: 0 0;
background-size: 220px 220px;
}
/*合同草稿*/
.watermark.water-draft{
display: block;
background-image: 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CAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgI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}
-
效果图：
效果图3.png
- 缺点： 每新增一种合同状态，需要重新用新图转base64码值，还得改动合同页面html代码。
第三阶段：cavas(或svg)转图片的base64码值，结合第二种阶段的思路。
功能需求： 在第二阶段的基础上，用户提出要用合同编号做合同水印，每个业务件对应的合同编号不一样，故需要动态生成水印效果，这会儿单行文本。结果隔了一周左右，又一个地方的用户提出需要显示多行文本的水印（城市名、平台名称、合同编号、签约时间）。
大体实现思路： 将canvas或svg转base64码值，然后结合第二阶段的思路。
svg实现方式
- 代码参考： demo页面代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="Access-Control-Allow-Origin" content="*">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no">
<title>svg动态生成合同水印(转pdf的工具生成的码值不一样，故pdf没法生成水印)</title>
<script src="jquery.js"></script>
<style type="text/css">
body{
font-family:-apple-system-font,BlinkMacSystemFont,Helvetica Neue,PingFang SC,Hiragino Sans GB,Microsoft YaHei UI,Microsoft YaHei,Arial,sans-serif;
color: #000;
}
.water{
background-color: transparent;
background-repeat: repeat;
background-position: 0 0;
background-size: 220px 220px;
}
.svg-wrap{
width: 220px;
height: 220px;
border: 1px solid #f00;
}
.svgimg,
#detail{
margin-bottom: 20px;
width: 500px;
min-height: 240px;
/* background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGlkPSJteXN2ZyIgaGVpZ2h0PSIyMjAiIHdpZHRoPSIyMjAiIGVuY29kaW5nPSJ1dGYtOCI+CiAgICAgICAgICAgIDx0ZXh0IGZpbGw9IiNmMDAiIGZvbnQ9ImJvbGQg5a6L5L2TIiBmb250LXNpemU9IjMwIiB0ZXh0LWFuY2hvcj0ibWlkZGxlIiBkb21pbmFudC1iYXNlbGluZT0ibWlkZGxlIiB0cmFuc2Zvcm09InJvdGF0ZSgtNDUsMTEwLDExMCkiIHg9IjExMCIgeT0iMTEwIiBlbmNvZGluZz0idXRmLTgiPuW3suWkh+ahiDwvdGV4dD4KICAgICAgICA8L3N2Zz4='); */
background-repeat: repeat;
background-position: 0 0;
background-size: 100px 100px;
word-break: break-all;
}
</style>
</head>
<body class="">
<!-- XT20220708151515 已备案-->
<!-- font="bold 宋体" -->
<h4>待转换的svg：水印文本：XT20220708151515、已备案</h4>
<div class="svg-wrap">
<svg id="mysvg" height="220" width="220" encoding="utf-8">
<text fill="#f00" font-size="30" text-anchor="middle" dominant-baseline="middle" transform="rotate(-45,110,110)" x="110" y="110" encoding="utf-8">已备案</text>
</svg>
</div>
<h4>svg转换后的img的base64码值和背景图渲染效果：</h4>
<div class="svgimg" id="water"></div>
<div>
网页版、wkhtmltopdf工具时，生成的base64码值是否一致：<span class="dev"></span>
</div>
<!-- https://www.bootcdn.cn/Base64/ -->
<!-- <script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/Base64/1.1.0/base64.min.js"></script> -->
<script>
//初始化加载
$(function () {
//网页版，生成的base64码值
//已备案
var page64 = 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGlkPSJteXN2ZyIgaGVpZ2h0PSIyMjAiIHdpZHRoPSIyMjAiIGVuY29kaW5nPSJ1dGYtOCI+CiAgICAgICAgCTx0ZXh0IGZpbGw9IiNmMDAiIGZvbnQtc2l6ZT0iMzAiIHRleHQtYW5jaG9yPSJtaWRkbGUiIGRvbWluYW50LWJhc2VsaW5lPSJtaWRkbGUiIHRyYW5zZm9ybT0icm90YXRlKC00NSwxMTAsMTEwKSIgeD0iMTEwIiB5PSIxMTAiIGVuY29kaW5nPSJ1dGYtOCI+5bey5aSH5qGIPC90ZXh0PgogICAgICAgIDwvc3ZnPg==';
//XT20220708151515
// page64 = 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGlkPSJteXN2ZyIgaGVpZ2h0PSIyMjAiIHdpZHRoPSIyMjAiIGVuY29kaW5nPSJ1dGYtOCI+CiAgICAgICAgCTx0ZXh0IGZpbGw9IiNmMDAiIGZvbnQtc2l6ZT0iMzAiIHRleHQtYW5jaG9yPSJtaWRkbGUiIGRvbWluYW50LWJhc2VsaW5lPSJtaWRkbGUiIHRyYW5zZm9ybT0icm90YXRlKC00NSwxMTAsMTEwKSIgeD0iMTEwIiB5PSIxMTAiIGVuY29kaW5nPSJ1dGYtOCI+WFQyMDIyMDcwODE1MTUxNTwvdGV4dD4KICAgICAgICA8L3N2Zz4=';
//wkhtmltopdf工具，生成的base64码值
var tool64 = 'data:image/svg+xml;base64,PHN2ZyBpZD0ibXlzdmciIGhlaWdodD0iMjIwIiB3aWR0aD0iMjIwIiBlbmNvZGluZz0idXRmLTgiPgogICAgICAgIAk8dGV4dCBmaWxsPSIjZjAwIiBmb250LXNpemU9IjMwIiB0ZXh0LWFuY2hvcj0ibWlkZGxlIiBkb21pbmFudC1iYXNlbGluZT0ibWlkZGxlIiB0cmFuc2Zvcm09InJvdGF0ZSgtNDUsMTEwLDExMCkiIHg9IjExMCIgeT0iMTEwIiBlbmNvZGluZz0idXRmLTgiPuW3suWkh+ahiDwvdGV4dD4KICAgICAgICA8L3N2Zz4=';
function svgBase64() {
var svg = document.getElementById('mysvg');
var s = new XMLSerializer().serializeToString(svg);
// 方法一
s = unescape(encodeURIComponent(s));//btoa、atoa不支持中文，用unescape处理
var svgBase64 = window.btoa(s);
svgBase64 = window.decodeURIComponent(svgBase64);
// 方法二
// s = decodeURIComponent(encodeURIComponent(s));//unescape已经过时废弃，换成uri处理
// var svgBase64 = window.btoa(reEncode(s));
// svgBase64 = svgBase64;
// 方法三
// var svgBase64 = Base64.encode(s);//base64.min.js
var imgBase64 = 'data:image/svg+xml;base64,'+svgBase64;
console.log({code:imgBase64});
console.log(tool64);
$('.dev').html(imgBase64==page64?'是':'否');
var imgStr = "background-image: url('"+imgBase64+"');";
$('.svgimg').html(imgStr);
$('.svgimg').attr('style',imgStr);
}
function reEncode(data) {
return decodeURIComponent(
encodeURIComponent(data).replace(/%([0-9A-F]{2})/g, function(match, p1) {
const c = String.fromCharCode('0x'+p1);
return c === '%' ? '%25' : c;
})
)
}
svgBase64();
});
</script>
</body>
</html>
-效果图：
效果图2.jpg
-
缺点： 虽然chrome浏览器打印能满足，但是工具wkhtmltopdf转pdf打印，水印效果消失。问题点：网页上svg转base64的生成的码值和工具wkhtmltopdf内置浏览器生成的码值不一致，并且后者生成的base64码值单独拿出来放浏览器的也无法显示，放console里，点击后只能解析成svg，不能解析成图片。如下图：
svg1.jpg
canvas实现方式
- 代码参考： demo页面代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="Access-Control-Allow-Origin" content="*">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no">
<title>canvas动态生成合同水印(多行文本)</title>
<script src="jquery.js"></script>
<style type="text/css">
body{
font-family:-apple-system-font,BlinkMacSystemFont,Helvetica Neue,PingFang SC,Hiragino Sans GB,Microsoft YaHei UI,Microsoft YaHei,Arial,sans-serif;
color: #000;
}
.red{
color: #f00;
padding-right: 6px;
}
/*水印*/
.watermark{
display: none;
position: fixed;
z-index: -1;
left: 0;
top: 0;
width: 100%;
/*height: 1134px;*/
height: 100%;
background-repeat: repeat;
background-position: 0 0;
background-size:300px 300px;
}
/*无水印*/
.watermark.water-no{
display: none !important;
}
/* 调试用 */
body{
padding: 10px;
padding-bottom: 100%;/*如果不加，那么调试的哪些div全是absolute,fixed布局，会导致body本身并没有撑开高度，所以转pdf后会看不到水印*/
}
.test-canvas{
position: absolute;
left: 430px;
top: 10px;
}
/* 计算用 */
.test-fli{
position: absolute;
left: 150px;
top: 150px;
}
.test-con{
position: absolute;
left: 10px;
top: 10px;
width: 400px;
height: 400px;
outline: 1px solid #f00;
}
.con1,
.con2,
.con3{
outline: 1px solid #0f0;
width: 278px;
height: 110px;
display: flex;
justify-content: center;
align-items: center;
}
.con1{
position: absolute;
left: 0;
top: 0;
}
.con2{
outline: 1px dashed #0f0;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}
.con3{
outline: 1px dashed #00f;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%,-50%) rotate(-45deg);
}
</style>
<!-- <script src="download2.js"></script> -->
</head>
<body>
<!--水印-->
<div class="watermark"></div>
<div class="test-fli">
<div class="test-canvas" style="left: 10px;">
<canvas id="myCanvas" width="400" height="400" style="outline:1px solid #f00;"></canvas>
</div>
<!-- 对比参照用 -->
<div class="test-con">
<div class="con1">原位置(canvas画布文字内容的宽高)</div>
<div class="con2">居中</div>
<div class="con3" style="font-size: 20px;line-height: 30px;text-align: center;"></div>
</div>
</div>
<script>
//初始化加载
$(function () {
function canvasToBase64(text,opt){
//水印内容
var txt = text;//多行文本，用逗号(,)分割。
if(!text) return false;
var txtArr = txt.split(',');
if(!opt){
opt = {};
}
//水印配置：字体，字号，是否加粗，文本倾斜角度，文本颜色，水印图的宽高(必须大于文本宽高)
var fontSize = opt.fontSize || 20;//单位：px，单行文本的字号
var fontSizeArr = opt.fontSizeArr ? opt.fontSizeArr : [];//单位：px，多行文本的字号
var lineHeight = opt.lineHeight ? opt.lineHeight : Math.floor(fontSize*1.5);//行高，默认为fontSize字号的1.5倍行高
var fontFamily = opt.fontFamily || '宋体';//字体，默认宋体
var fontWeight = opt.fontWeight || 'bold';//是否加粗，默认加粗
var angle = opt.angle || -45;//文本倾斜角度，默认-45deg
var fontColor = opt.fontColor || '#d9d9d9';//文本颜色，默认'#d9d9d9'
var width = opt.width || 200;//画布canvas宽度，单位px，默认200
var height = opt.height || 200;//画布canvas高度，单位px，默认200
var txtHeight = lineHeight*(txtArr.length)- (lineHeight-fontSize);//文字高度，因为文字垂直方向是top，高度需要减掉最后一行文本的多余行间距：lineHeight-fontSize
// var canvas = document.getElementById("myCanvas");//本地调试效果用
var canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
var context = canvas.getContext("2d");
// 设置字体
context.font = fontWeight+' '+fontSize+'px '+fontFamily;//比如："bold 20px 宋体"
// 设置水平对齐方式
context.textAlign = 'left';//left,center,right
// 设置垂直对齐方式
context.textBaseline = 'top';//top,bottom,middle
//不旋转，参考用
// var angle = -45;
var strWidth = context.measureText(txt).width;
var strWidthArr = [];
txtArr.forEach(function(txt, index){
var tempW = Math.ceil(context.measureText(txt).width);//向上取整，保证无小数
strWidthArr.push(tempW);
});
console.log('文字块：',strWidthArr);
strWidth = Math.max.apply(null,strWidthArr);
console.log("文字块宽高:"+strWidth+','+txtHeight);
context.save();
var tx = (canvas.width - strWidth)/2;
var ty = (canvas.height - txtHeight)/2;//字号等于行高
//中心位置旋转
context.save();
//p0 画布起始点（0,0），p1 canvas画布中心点（canvas.width/2, canvas.height/2），p2 文本块最终位置的左上角那个店（x2,y2）未知的需计算
var p1p2 = Math.sqrt(Math.pow(strWidth/2,2)+Math.pow(txtHeight/2,2));//文本块左上角，中心点连线长度
var p1p2Angle = (Math.atan(strWidth/txtHeight)*180/Math.PI-(90-Math.abs(angle)))*Math.PI/180;//文本块左上角，中心点连线和水平轴x的角度
console.log('文本块left-center连线: length：'+p1p2+',angle(PI):'+p1p2Angle);
tx = (canvas.width/2)-Math.cos(p1p2Angle)*p1p2;
ty = (canvas.height/2)+Math.sin(p1p2Angle)*p1p2;
console.log('p2:('+tx+','+ty+')');
// ty = 334;
context.translate(tx, ty);
context.rotate(angle * Math.PI / 180);//先移动translate,再旋转rotate，就是以文本原点为基点，如果先旋转再移动，就是以画布canvas原点为基点
context.fillStyle = fontColor;
var y = 0;
var x = 0;
txtArr.forEach(function(txt, index){
if(fontSizeArr.length==txtArr.length){
//如果每行文本的字号不一样
var tempFontSize = fontSizeArr[index];
context.font = fontWeight+' '+tempFontSize+'px '+fontFamily;//比如："bold 20px 宋体"
}
x = (strWidth - strWidthArr[index])/2;
context.fillText(txt, x, y + lineHeight * index);
});
// context.fillText(txt, 0, 0);//单行文字
context.restore();
// 生成图片信息
var dataUrl = canvas.toDataURL('image/png');
return dataUrl;
}
// var photoUrl = canvasToBase64('存量房网上交易平台,合同编号：预201911260001,2022/10/13 11:01:02');
//调试文本：合同草稿，XT20220708151515
//多行文本：逗号（,）分割，比如：'存量房网上交易平台,合同编号：预201911260001,2022/10/13 11:01:02'
var photoUrl = canvasToBase64('阜阳市,新建商品房交易网上交易平台,合同编号：FY2022335646,2022/10/13 11:01:02',{
width: 400,
height: 400,
fontSize: 20,
// angle: -30,
// fontSizeArr: [18,20,18],//多行文本，每行文字字号不一样时配置
// lineHeight: 30,//默认为字号的1.5倍行高
// fontColor: '#f00',
});
// console.log('文字转图片：',photoUrl);
$('.watermark').attr('style','display:block;background-image:url('+photoUrl+');background-size:400px 400px');
});
</script>
</body>
</html>
-
效果图：
效果图1.jpg 缺点： 暂无。
