vue实现平面图标记点位可拖拽可删除（可自定义标记图标）

需求：

1.不限制背景图的大小做overflower，标记点位获取相对位置xy，可拖动修改标点位置，可删除标点
2.关联设备后做自定义标记图标

图例：

代码：

1.html

<el-dialog title="设置设备" :visible.sync="imgMark" append-to-body id="plan"><div class="plan-img"><img class="bg" :src="bgSrc" @click.stop="setPoint" /><div v-for="(item, index) in markerArr" :key="index" class="block" :style="{ left: item.x, top: item.y, transform: 'translate(-50%, -100%)' }"@drag="dragenter($event, item)"draggable="true"><img :src="markSrc" class="mark-icon"  @click.stop="editPoit(index,item)" /><div class="button-group" v-if="item.showModal"><span @click="associative(index)">关联设备</span><span @click="deletePoit(index)">删除点位</span></div></div></div><div slot="footer" class="dialog-footer"><el-button type="primary" @click="submitMark" class="button-minwidth">确定</el-button><el-button @click="imgMark = false" class="button-minwidth">取消</el-button></div>
</el-dialog>

2.js

<script>
import bgSrc from '@/assets/images/bg.png'
import markSrc from '@/assets/images/img-mark.png'export default {data() {return {//平面图标记点位imgMark:false,bgSrc,markSrc,markerArr:[],};},created() {window.addEventListener("resize", this.getImgRect)},beforeDestroy() {window.removeEventListener("resize", this.getImgRect)},methods: {//设置设备handleSetDev(row){this.imgMark = truethis.getImgRect()},//绘制标记setPoint(e){e = e || window.event;let x = e.offsetX || e.layerX;let y = e.offsetY || e.layerY;let obj = {x: x + 'px',y: y + 'px',showModal:false}this.markerArr.push(obj);},//获取相对位置getImgRect() {setTimeout(() => {// 元素点是相对 背景图定位的    拖拽点获得的做标是相对屏幕的距离 this.imgRect = document.querySelector(".plan-img .bg").getBoundingClientRect()}, 30);},//移动位置dragenter(e, item) {const {x, y} = this.imgRectif(e.clientX !==0 && e.clientY !==0) {item.x = `${e.clientX - x}px`item.y = `${e.clientY - y}px`}   },//编辑标记editPoit(index,item){if(item.showModal==false){item.showModal=true}else {item.showModal=false}},//关联设备associative(index){},//提交关联设备submitDev(){this.spaceDev=false},//删除标记deletePoit(index){this.markerArr.splice(index, 1);},//提交标记submitMark(){this.imgMark=false},}
};
</script>

3.css

#plan{::v-deep .el-dialog{height: 65%;}::v-deep .el-dialog__body{overflow: hidden !important;}.plan-img{width: 100%;height: 100%;overflow: auto;margin-bottom: 20px;position: relative;.bg{position: relative;  top:0px;  left:0px;}.block{cursor: pointer;z-index: 29;position:absolute;display: flex;flex-direction: row;width: 24px;height: 30px;.mark-icon{position: absolute;top: 0;left: 0;width: 24px;height: 30px;z-index: 30;}.button-group{position: absolute;left: 34px;top: 0px;display: flex;flex-direction: column;background: #ffffff;z-index: 40;span{padding: 10px 44px 10px 20px;white-space: nowrap;}span:first-child{border-bottom: 1px solid #DCDFE6;}}}}
}

上图用到的图片放在下面了

标点图：
背景图：

切换自定义图标：

1.图例

这里我就不写具体功能实现js代码了，实现的思路是：
1.打开弹窗时必须要把markerArr置空并调用后台获取标点详情接口获取markerArr数据，下面组合数据可以参考
2.在标点选择关联的数据提交后，改变当前对象isDev属性为true切换图标样式并展示当前对象icon，下面HTML和CSS代码可以对比上文参考
3.如果当前对象的isDev已经为true，也可以切换另一条数据绑定Id进行重新绑定存入markerArr，这一步需要后台提供筛选数据的接口为基础，最后按后台保存接口参数要求筛选组合markerArr属性数据提交保存

2.代码

（1）组合数据

let arr=res.dataif(arr.length>0){arr.forEach(item=>{let obj={deptId:item.deptId,xcoordinate:item.xcoordinate?item.xcoordinate+'px':'',ycoordinate:item.ycoordinate?item.ycoordinate+'px':'',showModal:false,isDev:true,Id:item.Id,devName:item.devName,icon:item.icon}this.markerArr.push(obj)})
}

（2）html

<el-dialog title="设置设备" :visible.sync="imgMark" append-to-body id="plan"><div class="plan-img"><img class="bg" :src="bgSrc" @click.stop="setPoint" /><div v-for="(item, index) in markerArr" :key="index" :class="item.isDev==true?'blocks':'block'" :style="{ left: item.xcoordinate, top: item.ycoordinate, transform: 'translate(-50%, -100%)' }"@drag="dragenter($event, item)"draggable="true"><img v-if="item.isDev==false" :src="markSrc" class="mark-icon"  @click.stop="editPoit(index,item)" /> --><div v-if="item.isDev==true" class="marker-outer" @click.stop="editPoit(index,item)"><div class="marker-inner"><img :src="item.icon"/></div></div><div class="button-group" v-if="item.showModal"><span @click="associative(index)">关联设备</span><span @click="deletePoit(index)">删除点位</span></div></div></div><div slot="footer" class="dialog-footer"><el-button type="primary" @click="submitMark" class="button-minwidth">{{$t('Base.confirms')}}</el-button><el-button @click="imgMark = false" class="button-minwidth">{{$t('Base.cancels')}}</el-button></div></el-dialog>

（3）css

.blocks{cursor: pointer;z-index: 29;position:absolute;display: flex;flex-direction: row;width: 60px;height: 80px;.marker-outer{position: absolute;top: 0;left: 0;z-index: 30;display: inline-block;width: 66px;height: 66px;border-radius: 50%;background: #ffffff;text-align: center;box-shadow: 0px 0px 2px 3px #0095FF;.marker-inner{display: inline-block;width: 43px;height: 43px;border-radius: 50%;background: #fff;color: #111;position: absolute;top: 10px;left: 10px;z-index: 31;img{width: 100%;height: 100%;}}}

最近产品提了个做边界限制的需求，所以需要根据图标显示对按钮编辑框的显示位置进行动态变更

<div class="button-group" v-if="item.showModal":class="[toLeftBottom?'button-lb':'',toLeftTop?'button-lt':'',toRight?'buttom-r':'',toRightBottom?'buttom-rb':'',toRightTop?'buttom-rt':'']" ><span @click="associative(index)">关联设备</span><span @click="deletePoit(index)">删除点位</span>
</div>

data(){return{toLeftTop:false,  //左上toLeftBottom:false,  //左下toRight:false,toRightTop:false,  //右上toRightBottom:false,  //右下}
},
methods:{//编辑标记editPoit(index,item){this.markerArr.forEach(res=>{if(res!==item){res.showModal=false}else{if(item.showModal==false){item.showModal=true}else {item.showModal=false}}})let x=parseInt(item.xcoordinate)let y=parseInt(item.ycoordinate)let width=parseInt(this.imgWidth)let height=parseInt(this.imgHeight)this.toRight=falsethis.toLeftBottom=falsethis.toRightTop=falsethis.toLeftTop=falsethis.toRightBottom=falseif(x>=width-100){this.toRight=trueif(y<=50){this.toRightBottom=true}else if(y>=height-50){this.toRightTop=true}}else if(x<=20){if(y<=20){this.toLeftBottom=true}else if(y>=height-50){this.toLeftTop=true}}},
}

.button-lb{top: 80px;}
.button-lt{top:5px;}
.buttom-r{left: -130px;}
.buttom-rb{top: 80px;}
.buttom-rt{top: -40px;}.button-lb{top: 30px;}
.button-lt{top: -40px;}
.buttom-r{left: -130px;}
.buttom-rb{top: 30px;}
.buttom-rt{top: -40px;}