# openlayer 绘制自定义坐标点

openlayer 绘制自定义坐标点

引入相应的库

  import 'ol/ol.css';
  import Map from 'ol/Map';
  import OSM from 'ol/source/OSM';
  import TileLayer from 'ol/layer/Tile';
  import View from 'ol/View';
  import Projection from 'ol/proj/Projection';
  import ImageLayer from 'ol/layer/Image'
  import Static from 'ol/source/ImageStatic'
  import { getCenter } from 'ol/extent'
  import Feature from 'ol/Feature'
  import VectorSource from 'ol/source/Vector'
  import { Circle as CircleStyle, Style, Fill, Stroke } from 'ol/style'
  import { Heatmap as HeatmapLayer } from "ol/layer";
  import VectorLyr from 'ol/layer/Vector'
  import { Overlay } from 'ol'
  import { Polygon, Point } from "ol/geom";
  import { fromLonLat } from "ol/proj";
  import Modify from 'ol/interaction/Modify';
  import Draw from 'ol/interaction/Draw';
  import Snap from 'ol/interaction/Snap';
  import MousePosition from 'ol/control/MousePosition'
  import * as olCoordinate from 'ol/coordinate'
  import FullScreen from 'ol/control/FullScreen'
  import Text from 'ol/style/Text'

绘制自定义图标

	  // 添加标签
      addTag() {
        let src = require('../../../assets/ceshi.png')
        var element = document.createElement('div')
        element.className = 'point_icon'
        var p = document.createElement('p')
        var img = document.createElement('img')
        img.setAttribute('id', '123')
        var div = document.createElement('div')
        element.appendChild(p)
        element.appendChild(img)
        element.appendChild(div)
        // debugger
        img.style.width = '25px'
        img.style.height = '25px'
        img.src = src
        div.style.marginTop = '0px'
        div.innerText = '123'
        div.style.fontWeight = 'bold'
        div.style.fontSize = '12px'
        var pointOverlay = new Overlay({
          id: '123',
          stopEvent: false,
          element: element,
          positioning: 'center-center'
        })
        this.map.addOverlay(pointOverlay)
        // debugger
        pointOverlay.setPosition([50, 30])
      },

获取当前地图所有图层。

let overlays = this.map.getOverlays()

判断重新绘制图标位置。

	setPosition() {
        let overlays = this.map.getOverlays()
        if (overlays.array_ && overlays.array_.length > 0) {
          for (let i = 0; i < overlays.array_.length; i++) {
            if (overlays.array_[i].element.children[0].children[1] !== undefined) {
              let name = overlays.array_[i].element.children[0].children[1].attributes['id'].value
              if (name=== '123') {
                haveOverlay = true
                overlays.array_[i].setPosition([116, 67])
              }
            }
          }
        }
      },