ol(openlayers)使用记录

1. 项目环境：vue3+ts+vite
2. ol版本：7.1.0
3. 安装：
   yarn add ol或者npm i ol
4. 使用：保护区和标记点

	<template>
  <div id="map" class="my_map">
    <div>我在地域div>
  div>
template>

<script lang="ts" setup>
import { onMounted, reactive, shallowRef } from "vue";

import "ol/ol.css"; // 样式
import { Map, View, Feature } from "ol";
import TileLayer from "ol/layer/Tile";
import VectorSource from "ol/source/Vector.js";
import VectorLayer from "ol/layer/Vector.js";
import { XYZ, Cluster } from "ol/source";
import { defaults, ZoomSlider, Attribution, ScaleLine, FullScreen } from "ol/control";
import { Point, Polygon, MultiPolygon } from "ol/geom";
import { Style, Icon, Fill, Stroke, Text } from "ol/style";

import { getArea } from "@/api/species";
import { useRouter } from "vue-router";
import polygonData from '@/utils/feature.json'

const map = shallowRef(); // 存放地图实例
const router = useRouter();
const state = reactive({
  loading: false,
  name: '',
  mapData: [] as any[]
})

// 区域默认样式
let defaultStyle = new Style({
  fill: new Fill({
    color: "#16a08580"
  }),
  stroke: new Stroke({
    width: 2,
    color: '#16a085'
  })
})

// 区域高亮样式
let hightStyle = new Style({
  fill: new Fill({
    color: "#40e0d080"
  }),
  stroke: new Stroke({
    width: 2,
    color: '#40e0d0'
  })
})

let highlight: any; // 设置高亮元素变量
onMounted(() => {
  state.name = router.currentRoute.value.query.name as string || '';
  initMap()
  // onLoad()
  addArea(polygonData.features)

  addMarker([[101.501624, 24.966174], [101.501624, 24.966265], [101.501624, 21.966456], [101.501624, 24.116447], [101.501624, 24.966438], [101.501624, 24.966429], [101.501624, 24.966414]])
})

// 实例化地图
function initMap() {
  // 清除地图节点中的其他元素
  let map_dom = document.querySelector(".my_map");
  if (map_dom && map_dom.children[0]) {
    map_dom!.removeChild(map_dom!.children[0]);
  }
  // 地图实例
  map.value = new Map({
    target: "map", // 挂载元素id
    // 设置地图图层
    layers: [
      new TileLayer({
        source: new XYZ({
          url: "http://t0.tianditu.gov.cn/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=你的key",
        }),
      }), // 天地图瓦片底图
      new TileLayer({
        source: new XYZ({
          url: "http://t0.tianditu.gov.cn/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=你的key",
        }),
      }), // 天地图标注
    ],
    // 设置显示地图的视图
    view: new View({
      // 设置地图中心范围
      projection: "EPSG:4326", //EPSG:3857坐标系（投影坐标） EPSG:4326 坐标系（地理坐标）
      center: [101.501624, 24.966424], // 定义地图显示中心于经度，纬度
      zoom: 5, // 缩放级别
      maxZoom: 19, // 最大缩放级别
      minZoom: 1, // 最小缩放级别
      constrainResolution: true, //自动缩放到距离最近的整数级，非整数级别时地图会糊
      smoothResolutionConstraint: false, //2.关闭无级缩放地图
    }),
    //设置地图控件
    controls: defaults().extend([
      new ZoomSlider(), // 缩放按钮
      new Attribution(), // 版权信息
      new ScaleLine(), // 比例尺
      new FullScreen(), // 全屏控件
    ]),
  });


}

/**
 * 设置区域
 */
function addArea(geo: any[]) {
  if (geo.length == 0) return false;
  let areaFeature = null as any;
  // 设置图层
  let areaLayer = new VectorLayer({
    style: defaultStyle, // 默认样式
    source: new VectorSource({
      features: []
    })
  });
  // 添加图层
  map.value.addLayer(areaLayer);
  geo.forEach((item: any) => {
    if (item.geometry.type == "MultiPolygon") {
      areaFeature = new Feature({
        properties: item.properties,
        geometry: new MultiPolygon(
          item.geometry.coordinates
        )
      });
    } else if (item.geometry.type == "Polygon") {
      areaFeature = new Feature({
        properties: item.properties,
        geometry: new Polygon(
          item.geometry.coordinates
        )
      });
    }
    areaLayer!.getSource()!.addFeatures([areaFeature]);
  });
  //悬浮切换图层颜色
  map.value.on("pointermove", function (evt: any) {
    // 是否是拖拽事件
    if (evt.dragging) {
      return;
    }
    let feature = map.value.forEachFeatureAtPixel(evt.pixel, function (feature: any) {
      return feature;
    });

    // 是否规划区域
    if (feature && (feature.getGeometry() instanceof Polygon || feature.getGeometry() instanceof MultiPolygon)) {
      map.value.getTargetElement().style.cursor = "pointer"
      if (highlight) {
        highlight.setStyle(defaultStyle)
      }
      highlight = feature;
      feature.setStyle(hightStyle)
    } else {
      map.value.getTargetElement().style.cursor = ""
      if (highlight) {
        highlight.setStyle(defaultStyle)
      }
    }
  });

  //单机图层
  map.value.on("singleclick", function (evt: any) {
    // 判断点击的坐标是否在保护区范围内
    let feature = map.value.forEachFeatureAtPixel(evt.pixel, function (feature: any) {
      return feature;
    });
    if (feature != null) {
      let properties = feature.get("properties");
      console.log(feature.getGeometry(), properties); //{"name": "高黎贡山","ID": 95, "Area": 4800000000,"sheng": ""}
      // todo 点击事件
    }
  });
}


//添加标记点
function addMarker(lnglat: any, options = {}) {
  const lnglats = lnglat;
  // 创建Feature对象集合
  const features = [];
  for (let i = 0; i < lnglats.length; i++) {
    if (lnglats[i][0] !== '' && lnglats[i][1] !== '') {
      const numAry = new Feature({
        properties: {
          name: 'dsfsasadf'
        },
        geometry: new Point([parseFloat(lnglats[i][0]), parseFloat(lnglats[i][1])]),
      });
      features.push(numAry);
    }
  }

  const clusterSource = new Cluster({
    distance: 0.1, //标注之间
    source: new VectorSource({
      features: features,
    }),
  });

  const iconStyle = new Style({
    image: new Icon({
      opacity: 1,
      src: 'https://cdn-icons-png.flaticon.com/512/1483/1483336.png',
      anchor: [0.5, 3], // 偏移位置
      anchorOrigin: "bottom-left",
      anchorXUnits: "fraction",
      anchorYUnits: "pixels",
      offsetOrigin: "top-right",
      offset: [0, 1], //偏移量设置
      scale: 0.08, //图标缩放比例
    }),
    text: new Text({
      text: '测试名称',
      fill: new Fill({
        color: "#fff",
      }),
      offsetY: -50,
    })
  });

  const clusters = new VectorLayer({
    source: new VectorSource({
      features: features,
    }),
    style: iconStyle,
    ...options,
  });
  map.value!.addLayer(clusters);
}

// 请求数据
function onLoad() {
  try {
    if (!state.name) return;
    state.loading = true;
    getArea(state.name).then(res => {
      if (res.data.code === 200) {
        if (res.data.data instanceof Array) {
          state.mapData = res.data.data;
          addMarker(state.mapData, { name: "block" });
        }
      }
      state.loading = false;
    });
  } catch (e) {
    state.loading = false;
  }
}

script>

<style>
.my_map {
  width: 100%;
  height: 800px;
}
style>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265