Vue + OpenLayers 快速入门学习教程

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Openlayers 是一个模块化、高性能并且功能丰富的WebGIS客户端的JavaScript包，用于显示地图及空间数据，并与之进行交互，具有灵活的扩展机制。

简单来说，使用 Openlayers（后面简称ol）可以很灵活自由的做出各种地图和空间数据的展示。而且这个框架是完全免费和开源的。

前言

本文记录 Vue 使用 OpenLayers 入门，使用 OpenLayers 创建地图组件，分别使用 OpenLayers 提供的地图和本地图片做为地图。

Overview
OpenLayers makes it easy to put a dynamic map in any web page. It can display map tiles, vector data and markers loaded from any source. OpenLayers has been developed to further the use of geographic information of all kinds. It is completely free, Open Source JavaScript, released under the 2-clause BSD License (also known as the FreeBSD).

官方地址：https://openlayers.org/

1. 安装 OpenLayers 库

cnpm install ol

2. Vue 创建 OpenLayers 组件

效果图

Code

	<template>
	  <div id="map" class="map"></div>
	</template>
	
	<script>
	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";
	
	export default {
	  mounted() {
	    this.initMap();
	  },
	  methods: {
	    initMap() {
	      new Map({
	        layers: [
	          new TileLayer({
	            source: new OSM()
	          })
	        ],
	        target: "map",
	        view: new View({
	          center: [0, 0],
	          zoom: 2
	        })
	      });
	
	      console.log("init finished");
	    }
	  }
	};
	</script>
	<style>
	.map {
	  width: 100%;
	  height: 400px;
	}
	</style>

3. OpenLayers 使用本地图片作为地图

效果图：

Code

	<template>
	  <div>
	    <div id="map" class="map"></div>
	  </div>
	</template>
	
	<script>
	import "ol/ol.css";
	import ImageLayer from "ol/layer/Image";
	import Map from "ol/Map";
	import Projection from "ol/proj/Projection";
	import Static from "ol/source/ImageStatic";
	import View from "ol/View";
	import { getCenter } from "ol/extent";
	
	let extent = [0, 0, 338, 600];
	let projection = new Projection({
	  code: "xkcd-image",
	  units: "pixels",
	  extent: extent
	});
	
	export default {
	  data() {
	    return {
	      map: {}
	    };
	  },
	
	  mounted() {
	    this.initMap();
	  },
	
	  methods: {
	    initMap() {
	      this.map = new Map({
	        layers: [
	          new ImageLayer({
	            source: new Static({
	              attributions: '© <a href="http://xkcd.com/license.html" rel="external nofollow" >xkcd</a>',
	              url: "http://localhost:8080/img/123.5cba1af6.jpg",
	              projection: projection,
	              imageExtent: extent
	            })
	          })
	        ],
	        target: "map",
	        view: new View({
	          projection: projection,
	          center: getCenter(extent),
	          zoom: 1,
	          maxZoom: 4,
	          minZoom: 1
	        })
	      });
	    }
	  }
	};
	</script>
	<style>
	.map {
	  width: 100%;
	  height: 400px;
	}
	</style>

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