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elesign

v1.0.9

Published

canvas 电子涂鸦,线上签名

Downloads

7

Readme

elesign

通过 canvas 实现线上涂鸦,签名,清空,转为 png,橡皮擦,撤销回退,重做前进,可自定义画笔的颜色(或图片)、粗细。

props 属性

| 属性名 | 说明 | 类型 | 默认值 | | ----------- | --------------------------------------------------------------------------- | ---------------- | ------------------------------ | | width | 画布宽度 | Number | 500 | | height | 画布高度 | Number | 200 | | canvasStyle | 画布样式 | Object | { border: '2px solid #6699cc'} | | color | 画笔颜色 | String | #000 | | lineWidth | 画笔粗细 | String 或 Number | 10 | | empty | 空的文字内容 | String | 签名区域 | | defaultImg | 画布初始的值,格式应该是 canvas 的 toDataURL() 方法,生成的是 base64 的图片 | String | "" | | isEraser | 是否橡皮擦转状态 | Boolean | false | | eraserSize | 橡皮擦大小 | Number | 25 |

expose 暴露的实例属性

| 属性名 | 说明 | 类型 | | -------------- | ----------------- | -------- | | redo | 清空的方法 | function | | toPng | 转为 png 的的方法 | function | | backward | 撤销后退的方法 | function | | forward | 重做前进的的方法 | function | | isEmpty | 画布是否为空 | Boolean | | isBackwardAble | 是否可以撤销回退 | Boolean | | isForwardAble | 是否可以重做前进 | Boolean |

使用示例

<template>
  <div class="draw-wrap">
    <elesign ref="elesignRef" color="red" lineWidth="5" width="400" empty="请签名" />
    <div class="tool">
      <button @click="redo">重做</button>
      <button @click="toPng">打印png</button>
      <div>{{ '画布是否为空:' + isEmpty }}</div>
    </div>
  </div>
</template>
<script setup>
import { computed, ref } from 'vue';
import elesign from 'elesign';
const elesignRef = ref('');
const isEmpty = computed(() => {
  return elesignRef.value?.isEmpty;
});
/* 清空 */
function redo() {
  elesignRef.value?.redo();
}
/* 打印图片 */
function toPng() {
  let pic = elesignRef.value?.toPng();
  console.log(pic);
}
</script>
<style>
.draw-wrap {
  background: #fff;
  color: #000;
  padding: 40px;
}
.tool div {
  margin-top: 16px;
}
.tool button {
  margin-top: 16px;
  margin-right: 8px;
}
</style>