npm

vue-canvas-sign
TypeScript icon, indicating that this package has built-in type declarations

2.0.8 • Public • Published

vue-canvas-sign

npm package

vue canvas签名组件(vue canvas sign component),2.x版本为vue@3.x组件

如需在vue@2.x中使用,请使用 vue-canvas-sign@1.0.7,Github v1.x地址 github 1.x
yarn add vue-canvas-sign@^1.0.7
npm i vue-canvas-sign@^1.0.7 -S

示例

demo展示

vue-canvas-sign

用法

# 安装依赖
yarn add vue-canvas-sign
# or
npm i vue-canvas-sign -S

使用

<template>
  <!-- 使用方法一 -->
  <CanvasSign ref="canvasSign" imageType="image/png" :width="width" :line-width="lineWidth" :image-qual="0.01" background-color="#EEE" />
  <div>
    <button @click="saveHandle">save</button>
    <button @click="clearHandle">clear</button>
  </div>
  <hr />
  <!-- 使用方法二 -->
  <CanvasSign ref="canvasSign2" :height="400" :width="width" :line-width="lineWidth">
    <template v-slot="{ save, clear }">
      <button @click="() => save(saveCallback)">save</button>
      <button @click="() => clearWithSlotHandle(clear)">clear</button>
    </template>
  </CanvasSign>
  <hr />
  <!-- 生成图片展示 -->
  <img :src="imgSrc" alt="生成的图片" />
</template>
<script lang="ts">
import { defineComponent, onMounted, ref } from 'vue'
import CanvasSign, { ICanvasSign } from './canvas-sign'

const blankimg = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAC0lEQVQYV2NgAAIAAAUAAarVyFEAAAAASUVORK5CYII='
export default defineComponent({
  components: { CanvasSign },
  setup () {
    const imgSrc = ref(blankimg)
    const canvasSign = ref<ICanvasSign>()
    const canvasSign2 = ref<typeof CanvasSign>()
    // or
    // const canvasSign = ref<typeof CanvasSign>()

    // slot中save方法回调
    const saveCallback = (imgBase64?: string) => {
      imgSrc.value = imgBase64 || blankimg
    }
    // 不使用slot的save方法
    const saveHandle = () => {
      canvasSign.value?.save((img?: string) => {
        imgSrc.value = img || blankimg
      })
    }
    // 不使用slot的clear方法
    const clearHandle = () => {
      canvasSign.value?.clear() // 清空图片
      imgSrc.value = blankimg // 清空画布
    }
    // 使用slot的clear方法
    const clearWithSlotHandle = (clear: () => void) => {
      clear && clear() // 清空画布
      imgSrc.value = blankimg // 清空图片
    }

    onMounted(() => {
      window.onresize = () => {
        const w = document.documentElement.clientWidth || document.body.clientWidth
        width.value = w
        lineWidth.value = w / 100
        // 组件参数改变后,通过reset方法使属性生效
        canvasSign.value?.reset()
        canvasSign2.value?.reset()
      }
    })

    return {
      width,
      lineWidth,
      canvasSign,
      canvasSign2,
      imgSrc,
      saveCallback,
      saveHandle,
      clearHandle,
      clearWithSlotHandle
    }
  }
})
</script>

/** 
 * 注册全局组件
 */
import CanvasSign from 'vue-canvas-sign'

app.component('CanvasSign', CanvasSign)
// or
//app.use(CanvasSign)

组件参数

参数 说明 类型 默认值 可选值
width 画布宽 Number document宽度
height 画布高 Number 200
lineWidth 画线粗细 Number 2
color 画线颜色 String #000
backgroundColor 画布背景色 String rgba(255, 255, 255, 0)
borderWidth 边框宽度 Number 1
borderColor 边框颜色 String #333
imageType 生成图片类型,使用image/jpeg类型,注意修改background,清空画布再次绘制可能无法正常生成base64,所以不推荐使用使用image/jpeg类型 String image/png👍推荐🔥 image/png | image/jpeg | image/webp(Chrome支持)
imageQual 生成图片质量,imageType为image/jpeg时生效 Number 0.92 0 ~ 1 之间数字

slot

属性 说明 类型 参数
save 保存图片方法,需判断imgBase64是否为空 Function callback(imgBase64?: string)
clear 清空画布方法 Function
reset 组件参数改变后,通过reset方法使属性生效(reset方法会清空画布) Function

Package Sidebar

Install

npm i vue-canvas-sign

Weekly Downloads

6

Version

2.0.8

License

MIT

Unpacked Size

15.8 kB

Total Files

6

Last publish

Collaborators

  • jekorx