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water-mark-export

v0.0.3

Published

页面canvas水印生成及导出图片功能

Downloads

1

Readme

功能介绍

快速将你指定的元素通过canvas转为带有自定义水印显示的图片,并且支持png于jpg的预览和下载、导出。

安装

npm i water-mark-export -D
#or
yarn add water-mark-export -D
#of
pnpm i water-mark-export -D

快速上手

使用示例

import TransHtmlToImage from 'water-mark-export'

const transf = new TransHtmlToImage({
        // 绑定元素, 必须
        // 其他配置均为可选参数
        element: document.getElementById("box"),
        showWaterMark: true, // 是否添加水印,默认false
        autoDownload: false, // 是否生成图片后自动下载,默认false
        // fileName: 'file', // 导出图片的名称,默认当前时间戳
        // 水印配置项,皆为可选项
        // waterMark:{
          // textAlign: "center", // 文字排列
          // textBaseline: "middle", // 文本基线
          // font: "32px Microsoft Yahei", // 文本字体
          // fillStyle: "#c4c4c4", // 文本颜色
          // content: "请勿外传", // 文字内容
          // rotate: 45, // 旋转角度
          // spaceX: 200, // 水印列间距
          // spaceY: 200, // 水印行间距
          // numbers: 500, // 水印数量
          // alpha: 0.3, // 水印透明度
        // }
      });

transf.callOfTheGodDragon();

获取图片的url

// transf.callOfTheGodDragon();
// callOfTheGodDragon 是综合方法,toImage是转成canvas的实际触发方法
await transf.toImage()
const imgUrl = transf.getImgUrl()

手动触发下载

// 支持自动下载,可以在配置项中修改,需要先渲染才能下载
await transf.toImage()
transf.downloadImg();

动态设置水印

// transf.setWaterMark(type, value)
// type : "rotate" | "spaceX" | "spaceY" | "fillStyle" , 或者是水印配置对象
// value 实际值

transf.setWaterMark('fillStyle', '#ffffff')
transf.setWaterMark('alpha', '0.1')
transf.setWaterMark('rotate', '45')

await transf.setWaterMark(waterMarkOptions)

const imgUrl = transf.getImgUrl()

API

Props

参数名称|是否必填|说明|类型|默认 :-|:-:|:-|:-:|:-: element|必填|指定要渲染的元素|ref、event| showWaterMark|可选|生成图片是否显示水印|Boolean|false autoDownload|可选|是否生成图片后自动下载|Boolean|false waterMark|可选|水印定义选项|Object|详见下方定义 fileName|可选|定义下载图片名称|String|时间戳 exportExt|可选|定义导出图片类型后缀|jpeg、png|jpeg quality|可选|定义导出图片质量,范围(0~1)|Number|1 format|可选|定义生成的预览图片格式,blob更流畅,base64兼容更好|base64、blob|base64

Methods

通过组件实例调用的方法。

名称|说明|传参|回调参数 :-|:-|:-:|:-: callOfTheGodDragon|一键执行转换导出| |imgUrl toImage|通过html2canvas转换为canvas|element可选|canvas addWaterMark|手动执行触发水印添加函数| |canvas downloadImg|手动执行触发图片下载| |imgUrl getImgUrl|获取可用于预览的图片链接| |imgUrl setWaterMark|手动设置水印样式|WaterMarkOptions|imgUrl

水印配置项

参数名|说明|类型|默认 :-|:-|:-:|:-: textAlign|文字排列对齐方式|String|center textBaseline|文本基线|String|middle font|文本字体|String|32px Microsoft Yahei fillStyle|文本颜色,目前仅支持十六进制颜色|String|#c4c4c4 content|文字内容|String|请勿外传 rotate|旋转角度,范围(0-360)|Number|45 spaceX|水印列间距|Number|200 spaceY|水印行间距|Number|200 numbers|水印数量,调整水印的密集度|Number|500 alpha|水印透明度,范围(0-1)|Number|0.3