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VUE OPENLAYERS 定位 VUE + OPENLAYERS实现实时定位功能

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前言

本系列文章介绍一个简单的实时定位示例,示例的组成主要包括:

实现的效果:

在这里插入图片描述

一、定义标签样式

	var image = new CircleStyle({
	  radius: 5,
	  fill: new Fill({
	    color: "rgba(255, 0, 0, 1)"
	  }),
	  stroke: new Stroke({ color: "red", width: 1 })
	});
	
	var styles = {
	  Point: new Style({
	    image: image
	  })
	};
	
	var styleFunction = function(feature) {
	  return styles[feature.getGeometry().getType()];
	};

二、模拟 GeoJSON 数据

	var geojsonObject = {
	  type: "FeatureCollection",
	  features: [
	    {
	      type: "Feature",
	      geometry: {
	        type: "Point",
	        coordinates: [0, 0]
	      }
	    }
	    //此处可以添加更多 feature
	  ]
	};

三、创建 VerctorLayer

	//读取 GeoJSON, 将其作为 vectorSource 的数据源
	var vectorSource = new VectorSource({
	  features: new GeoJSON().readFeatures(geojsonObject)
	});
	
	var vectorLayer = new VectorLayer({
	  source: vectorSource,
	  style: styleFunction
	});

四、构建地图

      mounted() {
    this.map = new Map({
      layers: [
        new TileLayer({
          source: new OSM()
        }),
        vectorLayer
      ],
      target: "map",
      view: new View({
        center: [0, 0],
        zoom: 2
      })
    });
	
	//设置定时任务,调用移动标签方法
    setInterval(this.translate, 500);
  },

五、模拟实时移动

	 methods: {
	    translate() {
	      //遍历标签, 修改坐标位置
	      vectorSource.forEachFeature(function(f) {
	        console.log("translate");
	        
	        //随机产生坐标增量(此处不是坐标绝对值!!!!)
	        var x = Math.random() * 1000000;
	        var y = Math.random() * 1000000;
	        f.getGeometry().translate(x, y);
	      });
	    }
	  }

总结

以上是一个简单实时定位前端示例,通过模拟的 GeoJSON 对象展示标签,并通过定时任务模拟标签位置变化。下一篇将使用 Java 服务端提供位置数据,完整模拟一个实时定位系统。
可以在vue项目中直接运行的完整代码:

	<template>
	  <div>
	    <span>hi, map</span>
	    <div id="map" class="map"></div>
	  </div>
	</template>
	
	<script lang="ts">
	import "ol/ol.css";
	import GeoJSON from "ol/format/GeoJSON";
	import Map from "ol/Map";
	import View from "ol/View";
	import { Circle as CircleStyle, Fill, Stroke, Style } from "ol/style";
	import { OSM, Vector as VectorSource } from "ol/source";
	import { Tile as TileLayer, Vector as VectorLayer } from "ol/layer";
	
	import Vue from "vue";
	
	var image = new CircleStyle({
	  radius: 5,
	  fill: new Fill({
	    color: "rgba(255, 0, 0, 1)"
	  }),
	  stroke: new Stroke({ color: "red", width: 1 })
	});
	
	var styles = {
	  Point: new Style({
	    image: image
	  })
	};
	
	var styleFunction = function(feature) {
	  return styles[feature.getGeometry().getType()];
	};
	
	var geojsonObject = {
	  type: "FeatureCollection",
	  features: [
	    {
	      type: "Feature",
	      geometry: {
	        type: "Point",
	        coordinates: [0, 0]
	      }
	    }
	  ]
	};
	
	var vectorSource = new VectorSource({
	  features: new GeoJSON().readFeatures(geojsonObject)
	});
	
	var vectorLayer = new VectorLayer({
	  source: vectorSource,
	  style: styleFunction
	});
	
	export default Vue.extend({
	  data() {
	    return {
	      map: {}
	    };
	  },
	  mounted() {
	    this.map = new Map({
	      layers: [
	        new TileLayer({
	          source: new OSM()
	        }),
	        vectorLayer
	      ],
	      target: "map",
	      view: new View({
	        center: [0, 0],
	        zoom: 2
	      })
	    });
	
	    setInterval(this.translate, 500);
	  },
	
	  methods: {
	    translate() {
	      vectorSource.forEachFeature(function(f) {
	        console.log("translate");
	        var x = Math.random() * 1000000;
	        var y = Math.random() * 1000000;
	        f.getGeometry().translate(x, y);
	      });
	    }
	  }
	});
	</script>
	<style>
	.map {
	  width: 100%;
	  height: 600px;
	}
	</style>

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