街道标注

TIP

通过加载 geojson 数据渲染街道标注。

代码如下:

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<template>
  <div id="map"></div>
</template>

<script lang="ts" setup>
import { onMounted, onBeforeUnmount } from "vue";
import GeoJSON from "ol/format/GeoJSON";
import { Map, View } from "ol";
import { Tile as TileLayer, Vector as VectorLayer } from "ol/layer";
import { defaults, FullScreen } from "ol/control";
import { XYZ, Vector as VectorSource } from "ol/source";
import { getCenter } from "ol/extent";
import { Fill, Style, Text } from "ol/style";
import { MAPURL, ATTRIBUTIONS } from "../../../constants";

const style = new Style({
  text: new Text({
    font: 'bold 11px "Open Sans", "Arial Unicode MS", "sans-serif"',
    placement: "line",
    fill: new Fill({
      color: "white",
    }),
  }),
});
const raster = new TileLayer({
  source: new XYZ({
    attributions: ATTRIBUTIONS,
    url: MAPURL,
    maxZoom: 20,
  }),
});
const viewExtent = [1817379, 6139595, 1827851, 6143616];
let map: Map | null = null;
const initMap = () => {
  map = new Map({
    //初始化map
    target: "map",
    //地图容器中加载的图层
    layers: [
      //加载瓦片图层数据
      raster,
      new VectorLayer({
        declutter: true,
        source: new VectorSource({
          format: new GeoJSON(),
          url: "/geojson/vienna-streets.geojson",
        }),
        style: function (feature) {
          style.getText().setText(feature.get("name"));
          return style;
        },
      }),
    ],
    view: new View({
      extent: viewExtent,
      center: getCenter(viewExtent),
      //地图初始显示级别
      zoom: 17,
      minZoom: 14,
    }),
    //加载控件到地图容器中
    controls: defaults().extend([
      new FullScreen(), //加载全屏显示控件（目前支持非IE内核浏览器）
    ]),
  });
};

onMounted(() => {
  initMap();
});

onBeforeUnmount(() => {
  if (map) {
    map.dispose();
    map = null;
  }
});
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
#map {
  height: 650px;
}
</style>