}
}
Event.prototype.once = function ({type, fn}) {
const fixFn = () => {
fn()
this.off({type, fn: fixFn})
}
this.on({type, fn: fixFn})
}
Event.prototype.trigger = function (type){
if (this.typeList.hasOwnProperty(type)) {
this.typeList[type].forEach(fn => {
fn()
})
}
}
组件模板
<template>
<div class="jc-clip-image" :style="{width: `${clip.width}`}">
<canvas ref="ctx"
:width="clip.width"
:height="clip.height"
@mousedown="handleClip($event)"
>
</canvas>
<input type="file" ref="file" @change="readFileMsg($event)">
<div class="clip-scale-btn">
<a class="add" @click="handleScale(false)">+</a>
<a @click="rotate" class="right-rotate">转</a>
<a class="poor" @click="handleScale(true)">-</a>
<span>{{scale}}</span>
</div>
<div class="upload-warp">
<a class="upload-btn" @click="dispatchUpload($event)">upload</a>
<a class="upload-cancel">cancel</a>
</div>
<div class="create-canvas">
<a class="to-send-file" @click="outFile" title="请打开控制台">生成文件</a>
</div>
</div>
</template>
<script>
import {on, off, once} from '../../utils/dom'
export default {
ctx: null,
file: null,
x: 0, // 点击canvas x 鼠标地址
y: 0,// 点击canvas y 鼠标地址
xV: 0, // 鼠标移动 x距离
yV: 0, // 鼠标移动 y距离
nX: 0, // 原始坐标点 图像 x
nY: 0,// 原始坐标点 图像 y
img: null,
props: {
src: {
type: String,
default: null
},
clip: {
type: Object,
default () {
return {width: '200px', height: '200px'}
}
}
},
data () {
return {
isShow: false,
base64: null,
scale: 1.5, //放大比例
deg: 0 //旋转角度
}
},
computed: {
width () {
const {clip} = this
return parseFloat(clip.width.replace('px', ''))
},
height () {
const {clip} = this
return parseFloat(clip.height.replace('px', ''))
}
},
mounted () {
const {$options, $refs, width, height} = this
// 初始化 canvas file nX nY
Object.assign($options, {
ctx: $refs.ctx.getContext('2d'),
file: $refs.file,
nX: -width / 2,
nY: -height / 2
})
},
