知识点：
1.绘制多边形，实例化ol.interaction.Draw对象
draw_inter = new ol.interaction.Draw({source: source_draw,//矢量地图源type: "Polygon",//绘图类型});//将交互绘图对象添加到地图中map.addInteraction(draw_inter)
2.图形交互编辑，实例化ol.interaction.Select对象和ol.interaction.Modify对象
let select_f=new ol.interaction.Select({multi:false //取消多选})map.addInteraction(select_f);let modify_f = new ol.interaction.Modify({features: select_f.getFeatures()//将选中的要素添加修改功能})map.addInteraction(modify_f)
绘制多边形编辑并保存---- js核心代码
/*** map 地图对象* source_draw 用于绘制形状的矢量地图源* vectorLayer 矢量绘制层* draw_inter 绘制形状的交互对象* sketch 当前绘制对象(feature)* popup_overlay 弹窗overlay，绘制完成后展示编号* layer_poly 用于展示多边形的layer层*/var map,source_draw,vectorLayer,draw_inter,popup_overlay,sketch,layer_polyvar app = new Vue({el: '#app',data: {value_draw:'',//画笔选择器options_draw:[{value: 'Polygon',label: '标面'},{value: 'None',label: '清除画笔'}, ],popup_ol1:false,//弹窗，用来提示编号的/*** 表单* dk_id 多边形id* type_dk 多边形类型* coor 多边形坐标点* area 多边形面积*/formp: {dk_id:'',type_dk: '',coor:'',area:''},//表单规则formrules:{dk_id: [{required: true, message: '请选择一个多边形', trigger: 'blur' },],type_dk: [{required: true, message: '请选择用地类型', trigger: 'change' }],area:[{required: true, message: '请选择一个多边形', trigger: 'blur' },],coor: [{required: true, message: '请选择一个多边形', trigger: 'blur' },],},active_panel: ['1','2']//地图折叠面板显示},mounted() {//dom挂载完成，加载地图this.mapLoad();},methods: {mapLoad(){let that_=this//官方天地图var tdt_image =new ol.layer.Tile({source:new ol.source.XYZ({title: "天地图卫星影像图",url:"http://t0./img_w/wmts?" +"SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=img&STYLE=default&TILEMATRIXSET=w&FORMAT=tiles" +"&TILEMATRIX={z}&TILEROW={y}&TILECOL={x}&tk=天地图秘钥"})})var tdt_text =new ol.layer.Tile({source:new ol.source.XYZ({title: "天地图卫星影像文字标注",url: "http://t0./cia_w/wmts?" +"SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=cia&STYLE=default&TILEMATRIXSET=w&FORMAT=tiles" +"&TILEMATRIX={z}&TILEROW={y}&TILECOL={x}" +"&tk=天地图秘钥"})})//实例化一个矢量图层Vector作为绘制层source_draw = new ol.source.Vector()vectorLayer = new ol.layer.Vector({source:source_draw,style: new ol.style.Style({fill: new ol.style.Fill({//填充样式color: 'rgba(255, 255, 255, 0.2)'}),stroke: new ol.style.Stroke({//线样式color: '#ffcc33',width: 2}),image: new ol.style.Circle({//点样式radius: 7, fill: new ol.style.Fill({color: '#2d98da'})}),text: new ol.style.Text({font: '16px Calibri,sans-serif',text: "未保存地块",fill: new ol.style.Fill({color: "#c0392b"}),backgroundFill: new ol.style.Fill({// 填充背景color: 'rgba(0,0,0,1)',}),})})});//地图容器map = new ol.Map({layers: [tdt_image ,tdt_text ,vectorLayer], target: 'map',view: new ol.View({center: ol.proj.fromLonLat([107.77746092130616, 22.52862563840752]),//ol.proj.fromLonLat后面如果不填要转换的坐标系，默认为3857。// 数据格式4326转为3857zoom: 17,minZoom: 2}),})//加载数据已绘制的数据this.load_data()//添加交互this.selectModify()},//请求数据load_data(){var that_=thisthat_.loading=true$.ajax({url : 'http://127.0.0.1:8000/lzfy/f/luokuo/getDongyaParcel',type : 'get',jsonp: 'jsonpCallback',dataType: 'jsonp',success: function(returnData) {that_.dkOutline(returnData)},error : function() {that_.$message.error('坐标点数据加载失败');console.log('坐标点数据加载失败')},})},//select选项改变时handleChange(){if(draw_inter){map.removeInteraction(draw_inter) //绘制之前先清空上一次交互画笔}//绘制类型let draw_type =this.value_draw //获取绘画的类型if (draw_type !== 'None'){if(draw_type=='LineString'||draw_type=='Polygon'){//绘画交互this.addInteraction()}}},//绘画交互图形addInteraction(){let that_=thislet draw_type =this.value_draw //获取绘画的类型draw_inter = new ol.interaction.Draw({source: source_draw,type: draw_type,});//将交互绘图对象添加到地图中map.addInteraction(draw_inter)//绘画开始时// draw_inter.on('drawstart', function (evt) {// // set sketch// sketch = evt.feature;// })//监听绘制结束事件draw_inter.on('drawend', function (evt) {sketch=evt.feature//为sketch生成唯一编号let date = new Date()let dk_id= date.getFullYear().toString() + (date.getMonth()+ 1).toString() +date.getDate().toString() + date.getHours().toString() + date.getMinutes().toString() + date.getSeconds().toString()//画完之后给sketch添加属性sketch.setProperties({attribute: {dk_id:dk_id,state:1},})// 添加overlay的内容及表单赋值that_.addOverlay1()})},//选中修改几何图形selectModify(){let that_=thislet select_f=new ol.interaction.Select({multi:false //取消多选})map.addInteraction(select_f);let modify_f = new ol.interaction.Modify({features: select_f.getFeatures()//将选中的要素添加修改功能})map.addInteraction(modify_f)select_f.on("select",function (evt) {if(that_.value_draw !="Polygon"){//点击空白清除,清除弹窗，清空表单内容if(evt.selected.length<=0) {that_.popup_ol1 = falsepopup_overlay.setPosition(undefined)if (that_.$refs['formp']!==undefined) {that_.$refs['formp'].resetFields();}return}//选中一个要素时if(evt.selected.length==1) {// console.log(evt.selected[0].getProperties())sketch=evt.selected[0]// 添加overlay的内容，及给表单赋值that_.addOverlay1()}}})//监听要素修改时modify_f.on("modifyend",function (evt) {let new_feature = evt.features.item(0)if(new_feature){sketch=new_feature// 添加overlay的内容，及给表单赋值that_.addOverlay1()}})},//点击弹窗的popup_click(){this.popup_ol1=falsepopup_overlay.setPosition(undefined)},//表单提交submitForm(formName){let that_=thisthat_.$refs[formName].validate((valid) => {if (valid) {let formData = JSON.stringify(that_.formp); // that_指向这个VUE实例 data默认绑定在实例下的。所以直接that_.student就是要提交的数据$.ajax({url : 'http://127.0.0.1:8080/lzfy/f/luokuo/testaaa',type : 'post',data : that_.formp,// jsonp: 'jsonpCallback',// dataType: 'jsonp',success: function(returnData) {that_.$message({message: '保存成功！！！',type: 'success'})//删除绘制图形层的feature，向展示图形层添加featurelet state=sketch.getProperties().attribute["state"]if(state){vectorLayer.getSource().removeFeature(sketch)sketch.setProperties({attribute: {dk_id:that_.formp.dk_id,type_dk:that_.formp.type_dk,state:0}})layer_poly.getSource().addFeature(sketch)}else{sketch.setProperties({attribute: {dk_id:that_.formp.dk_id,type_dk:that_.formp.type_dk,state:0}})}},error : function() {that_.$message.error('提交失败')},})} else {that_.$message.error('提交失败')console.log("失败")}});},//重置表单，删除要素resetForm(formName){// source_drawlet that_=thisthat_.popup_ol1=falsepopup_overlay.setPosition(undefined)let state=sketch.getProperties().attribute["state"]if(!state){layer_poly.getSource().removeFeature(sketch)let dk_id=sketch.getProperties().attribute["dk_id"]$.ajax({url : 'http://127.0.0.1:8080/lzfy/f/luokuo/delWithDkid?dk_id='+String(dk_id),type : 'get',// data : {dk_id:dk_id},success: function(returnData) {console.log(returnData)that_.$message({message: '删除成功！！！',type: 'success'})},error : function() {that_.$message.error('删除失败')},})}else{vectorLayer.getSource().removeFeature(sketch)that_.$message({message: '删除成功！！！',type: 'success'})}sketch=nullthat_.$nextTick(() => {if (this.$refs[formName]!==undefined) {this.$refs[formName].resetFields();}})},addOverlay1(new_geo){//添加弹窗let that_= thislet elPopup = that_.$refs.popup_ol1popup_overlay = new ol.Overlay({element: elPopup,offset:[0,0],//popup的偏移量positioning: 'center-center',autoPan: true, // 定义弹出窗口在边缘点击时候可能不完整 设置自动平移效果autoPanAnimation: {duration: 250 //当Popup超出地图边界时，为了Popup全部可见，地图移动的速度. 单位为毫秒（ms）}})map.addOverlay(popup_overlay)that_.popup_ol1 = true//声明一下变量let tooltipCoordlet gem1=sketch.getGeometry()let type_geo=gem1.getType()let coor=gem1.getCoordinates()//以下是为表单添加数据//timeid数据that_.formp.dk_id=sketch.getProperties().attribute["dk_id"]//面积数据if (type_geo=="Polygon"){//获取多变形内部点的坐标tooltipCoord = gem1.getInteriorPoint().getCoordinates()let area = ol.sphere.getArea(gem1)let num1=(Math.round(area * 100) / 100)*0.0015let output = num1.toFixed(2) + '亩'that_.formp.area=output}else if(type_geo=="LineString"){tooltipCoord = gem1.getLastCoordinate()var length = ol.sphere.getLength(gem1)let outputif (length > 100) {output = Math.round((length / 1000) * 100) / 100 + ' ' + 'km';} else {output = Math.round(length * 100) / 100 + ' ' + 'm';}that_.formp.area=output}setTimeout(() => {popup_overlay.setPosition(tooltipCoord)// console.log(tooltipCoord)}, 0)//地块类型数据和idlet state=sketch.getProperties().attribute["state"]if(!state){that_.formp.type_dk=sketch.getProperties().attribute["type_dk"]}//坐标点数据that_.formp.coor=String(coor)},//对获取后台数据进行展示到地图中dkOutline(coor_datas){let that_ =this//多边形要素数组let poly_Features=[]// console.log(coor_datas)for (var i = 0; i < coor_datas.length; i++){// console.log(coor_datas[i].type_dk)var attr1={dk_id:coor_datas[i].dk_id,type_dk:coor_datas[i].type_dk,state:0}// console.log(coor_datas[i].coordinates)poly_Features.push(new ol.Feature({geometry: new ol.geom.Polygon([coor_datas[i].coordinates]),attribute: attr1}))}//实例化一个矢量图层Vector作为绘制层let source_poly = new ol.source.Vector({features: poly_Features})layer_poly = new ol.layer.Vector({// visible: false,source: source_poly,style: function (feature) {let type_dk=feature.values_.attribute.type_dk//获取feature的属性的自定义信息let color_define="#e74c3c"let text ="旱改水地块"if (type_dk=="A"){color_define="#e74c3c"text ="旱改水地块"}else if (type_dk=="B"){color_define="#e67e22"text ="施肥地块"}else if (type_dk=="C"){color_define="#3498db"text ="缓释肥实验地块"}else if (type_dk=="D"){color_define="#2ecc71"text ="康泽公司地块"}else if (type_dk=="E"){color_define="#9b59b6"text ="石埠奶场征地"}return new ol.style.Style({fill: new ol.style.Fill({//填充样式color: 'rgba(0, 0, 0, 0.5'}),stroke: new ol.style.Stroke({//线样式color: color_define,width: 2}),text: new ol.style.Text({text: text,font: '16px Calibri,sans-serif',fill: new ol.style.Fill({color: '#fff'}),backgroundFill: new ol.style.Fill({// 填充背景color: 'rgba(0,0,0,0.4)',}),}),})}})//将绘制层添加到地图容器中map.addLayer(layer_poly)},}})
