#openlayers #定位 #gis

openlayers 绘制图标并定位到图标

环境

vue3 ts sass

具体代码

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<template>
  <div class="btn-wrapper">
    <span style="color: red"> 上一个定位的点 {{ prePoint }}</span>
    <button
      class="button"
      v-for="(item, index) in data"
      :key="index"
      @click="handleMoveToTarget(item)"
    >
      定位到目标 item
    </button>
  </div>
  <div id="map" class="map"></div>
</template>

<script lang="ts" setup>
  import { onMounted, ref } from 'vue'
  import 'ol/ol.css'
  import { Map, View, Feature } from 'ol'
  import { XYZ, Vector as SourceVector } from 'ol/source'
  import TileLayer from 'ol/layer/Tile'
  import { Vector as LayerVector } from 'ol/layer'
  import { Style, Icon, Text, Fill, Stroke } from 'ol/style'
  import { Point } from 'ol/geom'

  const data = [
    [158.6, 29.8],
    [159, 30.5],
    [159.4, 30.9],
    [160.2, 31.8],
    [160.5, 32.2],
    [162.4, 33.4],
    [164, 34.3],
    [166.2, 35.7],
    [167.6, 36.3]
  ]

  const map = ref<Map>()
  const prePoint = ref<number[]>([])

  const customLayer = new LayerVector({
    source: new SourceVector()
  })

  const setItem = (point: number[], color = '#000') => {
    const anchor = new Feature({
      name: `[${point}]`,
      geometry: new Point(point)
    })

    // 设置样式，在样式中就可以设置图标
    anchor.setStyle(
      new Style({
        image: new Icon({
          src: '/logo.png',
          width: 60,
          height: 60,
          color: color
        }),
        text: new Text({
          textAlign: 'center', // 位置
          textBaseline: 'middle', // 基准线
          font: 'normal 12px 微软雅黑', // 文字样式
          text: anchor.get('name'),
          // text: '文字样式',
          fill: new Fill({
            // 文本填充样式（即文字颜色)
            color: '#fff'
          }),
          stroke: new Stroke({
            color: '#999',
            width: 1
          })
        }),
        stroke: new Stroke({
          color: '#fff',
          width: 100
        })
      })
    )
    // 添加点击事件
    ;(anchor.on as any)('click', (e: any) => {
      console.log(e, 'e')
    })

    customLayer.getSource()?.addFeature(anchor)
  }

  const init = () => {
    map.value = new Map({
      target: 'map',
      layers: [
        new TileLayer({
          source: new XYZ({
            url: 'http://wprd0{1-4}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&style=7&x={x}&y={y}&z={z}',
            wrapX: false
          })
        }),
        customLayer
      ],
      view: new View({
        projection: 'EPSG:4326',
        // 定位
        // center: [110.592595, 20.911173],
        center: [158.6, 29.8],
        zoom: 8,
        maxZoom: 18,
        minZoom: 1
      })
    })

    data.forEach(item => {
      setItem(item)
    })

    map.value?.on('click', function (this: any, e) {
      console.log(e.pixel)
      console.log(this)

      this.forEachFeatureAtPixel(e.pixel, function (feature: any) {
        // 为点击的feature发送自定义的click消息
        feature.dispatchEvent &&
          feature.dispatchEvent({ type: 'click', event: e })
      })
    })
  }

  // 定位到目标
  const handleMoveToTarget = (point: number[]) => {
    // 还原原来的颜色
    if (prePoint.value.length) {
      setItem(prePoint.value)
    }

    let zoom = map.value?.getView().getZoom() as number
    const duration = 2000
    map.value?.getView().animate(
      {
        center: point,
        duration: duration
      },
      e => {
        console.log(e, 'callback-1')
      }
    )

    map.value?.getView().animate(
      {
        zoom: zoom - 1,
        duration: duration / 2
      },
      {
        zoom: zoom,
        duration: duration / 2
      },
      e => {
        console.log(e, 'callback-2')
        setItem(point, '#0f0')

        prePoint.value = point
      }
    )
  }

  onMounted(init)
</script>

<style lang="scss">
  .map {
    height: 100vh;
    width: 100%;
    background-color: #000;
  }

  .btn-wrapper {
    width: 100%;
    position: fixed;
    left: 150px;
    top: 30px;
    z-index: 2;

    .button + .button {
      margin-left: 20px;
    }
  }
</style>

文档

http://openlayers.vip/

#openlayers #定位 #gis