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@shutwt/vue-esign

v2.0.3

Published

A canvas signature component of vue

Downloads

10

Readme

vue-esign

Canvas 手写签字 电子签名

npm GitHub package.json version

支持vue2和vue3

功能

  1. 兼容 PC 和 Mobile;
  2. 画布自适应屏幕大小变化(窗口缩放、屏幕旋转时画布无需重置,自动校正坐标);
  3. 自定义画布尺寸(导出图尺寸),画笔粗细、颜色,画布背景色;
  4. 支持裁剪 (针对需求:有的签字需要裁剪掉四周空白)。
  5. 导出图片格式为 base64
  6. 示例demo

安装

npm install @shutwt/vue-esign #如果你用npm
yarn add @shutwt/vue-esign #如果你用yarn
pnpm add @shutwt/vue-esign #如果你用pnpm
bun add @shutwt/vue-esign #如果你用bun

使用

  1. 全局使用 、局部
// 全局 vue2 main.js
import vueEsign from '@shutwt/vue-esign'
import '@shutwt/vue-esign/dist/style.css'
Vue.use(vueEsign)
// 全局vue3 main.js
import { createApp } from 'vue'
import App from './App.vue'
import vueEsign from '@shutwt/vue-esign'
import '@shutwt/vue-esign/dist/style.css'
const app = createApp(App)
app.use(vueEsign)
// 局部
import vueEsign from '@shutwt/vue-esign'
//如果是选项式api
export default {
    components: { vueEsign }
}
  1. 页面中使用 必须设置 ref ,用来调用组件的两个内置方法 reset()generate()

无需给组件设置 style 的宽高,如果画布的 width属性值没超出父元素的样式宽度,则该组件的样式宽度就是画布宽度,超出的话,组件样式宽度则是父元素的100%; 所以只需设置好父元素的宽度即可;

<!-- vue2 -->
<vue-esign ref="esign" :width="800" :height="300" :isCrop="isCrop" :lineWidth="lineWidth" :lineColor="lineColor" :bgColor.sync="bgColor" />
<!-- vue3 -->
<vue-esign ref="esign" :width="800" :height="300" :isCrop="isCrop" :lineWidth="lineWidth" :lineColor="lineColor" v-model:bgColor="bgColor" />

<!-- isClearBgColor为false时,不必再给bgColor加sync修饰符或v-model -->

<button @click="handleReset">清空画板</button>
<button @click="handleGenerate">生成图片</button>
data () {
  return {
    lineWidth: 6,
    lineColor: '#000000',
    bgColor: '',
    resultImg: '',
    isCrop: false
  }
},
methods: {
  handleReset () {
    this.$refs.esign.reset()
  },
  handleGenerate () {
    this.$refs.esign.generate().then(res => {
      this.resultImg = res
    }).catch(err => {
      alert(err) // 画布没有签字时会执行这里 'Not Signned'
    })
  }
}
  1. 说明

| 属性 | 类型 | 默认值 | 说明 | | :-: | :-- | :-: | :-- | | width | Number | 800 | 画布宽度,即导出图片的宽度 | | height | Number | 300 | 画布高度,即导出图片的高度 | | lineWidth | 4 | Number | 画笔粗细 | | lineColor | String | #000000 | 画笔颜色 | | bgColor | String | 空 | 画布背景色,为空时画布背景透明,支持多种格式 '#ccc','#E5A1A1','rgb(229, 161, 161)','rgba(0,0,0,.6)','red' | | isCrop | Boolean | false | 是否裁剪,在画布设定尺寸基础上裁掉四周空白部分 | | isClearBgColor | Boolean | true | 清空画布时(reset)是否同时清空设置的背景色(bgColor) | | format | String | image/png | 生成图片格式 image/jpeg(jpg格式下生成的图片透明背景会变黑色请慎用或指定背景色)、 image/webp | | quality | Number | 1 | 生成图片质量;在指定图片格式为 image/jpeg 或 image/webp的情况下,可以从 0 到 1 的区间内选择图片的质量。如果超出取值范围,将会使用默认值 0.92。其他参数会被忽略。 |

两个内置方法,通过给组件设置 ref 调用:

清空画布

this.$refs.esign.reset()

生成图片

// 可选配置参数 ,在未设置format或quality属性时可在生成图片时配置 例如: {format:'image/jpeg', quality: 0.5}
// this.$refs.esign.generate({format:'image/jpeg', quality: 0.5})

this.$refs.esign.generate().then(res => {
  console.log(res) // base64图片
}).catch(err => {
  alert(err) // 画布没有签字时会执行这里 'Not Signned'
})