leaflet-book: leaflet的学习，样例集,Demo

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</style><title>README</title></head><body><article class="markdown-body"><h3 id="leaflet-demo">入门 Leaflet 之小 Demo<a class="headerlink" href="#leaflet-demo" title="Permanent link"></a></h3>
<hr />
<blockquote>
<p>写在前面 ---- WebGIS 开发基础之 Leaflet</p>
<ol>
<li>GIS 基本概念：GIS、Map、Layer、Feature、Geometry、Symbol、Data（Point、Polyline、Polygon）、Renderer、Scale、Project、Coordinates；</li>
<li>GIS 开发概述：架构模式、常用平台和 SDK、二维三维</li>
<li>使用 Leaflet 开发常用功能</li>
</ol>
<ul>
<li>地图加载（底图类型、切换）：</li>
<li>地图操作（缩放、平移、定位/书签、动画）：</li>
<li>图层管理（加载、移除、调整顺序）：</li>
<li>要素标绘（点/聚簇、线、面，符号化/静态动态）：</li>
<li>属性标注（字段可选、样式定制）：</li>
<li>专题地图（点、线、面，渲染）：</li>
<li>查询定位（属性查询、空间查询/周边搜索/缓冲区/面查点线面/点线查面、图属互查、综合查询）：</li>
<li>信息窗口（入口、Popup、定制）：</li>
<li>坐标转换（地理与投影、不同地理坐标系）：</li>
<li>空间运算（长度面积测量、点取坐标、缓冲区、相交包含关系）：</li>
<li>动态监控（固定点状态切换、车辆监控）：
  <img alt="" src="https://user-gold-cdn.xitu.io/2018/2/25/161cd7239e171384?w=1920&amp;h=959&amp;f=png&amp;s=222128" /></li>
</ul>
<ol>
<li><a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/tree/Leaflet%20API.png">Leaflet API</a><img alt="" src="https://user-gold-cdn.xitu.io/2018/3/1/161dd4951441cce1?w=691&amp;h=1217&amp;f=png&amp;s=54115" /></li>
</ol>
</blockquote>
<hr />
<h4 id="demo">Demo 用到的库<a class="headerlink" href="#demo" title="Permanent link"></a></h4>
<ul>
<li>Flat-UI <a href="https://github.com/designmodo/Flat-UI/"> Flat UI is based on Bootstrap, a comfortable, responsive, and functional framework that simplifies the development of websites.</a>Flat-UI 是基于 Bootstrap 的一个扁平化风格 web 开发框架。</li>
<li>leaflet <a href="http://leafletjs.com/reference-1.3.0.html">an open-source JavaScript library for mobile-friendly interactive maps.</a>Leaflet 是一个为建设交互性好适用于移动设备地图，而开发的现代的、开源的 JavaScript 库。</li>
<li>Esri Leaflet <a href="http://esri.github.io/esri-leaflet/">A lightweight set of tools for using ArcGIS services with Leaflet.</a>一个轻量级的工具,基于 leaflet 利用 ArcGIS 服务。</li>
</ul>
<hr />
<h3 id="part-1-demo-1">PART 1： 地图加载（底图类型、切换） <a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/demo1.html">Demo 1 </a><a class="headerlink" href="#part-1-demo-1" title="Permanent link"></a></h3>
<p><img alt="" src="https://user-gold-cdn.xitu.io/2018/2/25/161cd7e9bfff52ad?w=1920&amp;h=957&amp;f=jpeg&amp;s=2237468" /></p>
<ul>
<li>库引用</li>
</ul>
<div class="codehilite"><pre><span class="p">&lt;</span><span class="nt">link</span> <span class="na">rel</span><span class="o">=</span><span class="s">&quot;stylesheet&quot;</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;text/css&quot;</span> <span class="na">href</span><span class="o">=</span><span class="s">&quot;./lib/Flat-UI-master/dist/css/vendor/bootstrap/css/bootstrap.min.css&quot;</span>
    <span class="p">/&gt;</span>
<span class="p">&lt;</span><span class="nt">link</span> <span class="na">rel</span><span class="o">=</span><span class="s">&quot;stylesheet&quot;</span> <span class="na">href</span><span class="o">=</span><span class="s">&quot;./lib/Flat-UI-master/dist/css/flat-ui.min.css&quot;</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">link</span> <span class="na">rel</span><span class="o">=</span><span class="s">&quot;stylesheet&quot;</span> <span class="na">href</span><span class="o">=</span><span class="s">&quot;./lib/leaflet/leaflet.css&quot;</span><span class="p">&gt;</span>
</pre></div>

<div class="codehilite"><pre><span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./lib/Flat-UI-master/dist/js/vendor/jquery.min.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./lib/Flat-UI-master/dist/js/flat-ui.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./lib/leaflet/leaflet.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./js/urlTemplate.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
</pre></div>

<ul>
<li>地图加载与切换</li>
</ul>
<div class="codehilite"><pre><span class="kr">const</span> <span class="nx">map</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="s2">&quot;mapDiv&quot;</span><span class="p">,</span> <span class="p">{</span>
        <span class="nx">crs</span><span class="o">:</span> <span class="nx">L</span><span class="p">.</span><span class="nx">CRS</span><span class="p">.</span><span class="nx">EPSG3857</span><span class="p">,</span> <span class="c1">//要使用的坐标参考系统，默认的坐标参考系,互联网地图主流坐标系</span>
        <span class="c1">// crs: L.CRS.EPSG4326, //WGS 84坐标系，GPS默认坐标系</span>
        <span class="nx">zoomControl</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
        <span class="c1">// minZoom: 1,</span>
        <span class="nx">attributionControl</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
    <span class="p">}).</span><span class="nx">setView</span><span class="p">([</span><span class="mf">30.6268660000</span><span class="p">,</span> <span class="mf">104.1528940000</span><span class="p">],</span> <span class="mi">18</span><span class="p">);</span><span class="c1">//定位在成都北纬N30°37′45.58″ 东经E104°09′1.44″</span>
    <span class="kd">let</span> <span class="nx">Baselayer</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">tileLayer</span><span class="p">(</span><span class="nx">urlTemplate</span><span class="p">.</span><span class="nx">mapbox_Image</span><span class="p">,</span> <span class="p">{</span>
       <span class="nx">maxZoom</span><span class="o">:</span> <span class="mi">17</span><span class="p">,</span> <span class="c1">//最大视图</span>
        <span class="nx">minZoom</span><span class="o">:</span> <span class="mi">2</span><span class="p">,</span> <span class="c1">//最小视图</span>
        <span class="nx">attribution</span><span class="o">:</span> <span class="s1">&#39;liuvigongzuoshi@foxmail.com  &amp;copy; &lt;a href=&quot;https://github.com/liuvigongzuoshi/WebGIS-for-learnning/tree/master/Leaflet_Demo&quot;&gt;WebGIS-for-learnning&lt;/a&gt;&#39;</span>
    <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>

<span class="kr">const</span> <span class="nx">setLayer</span> <span class="o">=</span> <span class="p">(</span><span class="nx">ele</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="nx">map</span><span class="p">.</span><span class="nx">removeLayer</span><span class="p">(</span><span class="nx">Baselayer</span><span class="p">)</span>
    <span class="k">if</span> <span class="p">(</span><span class="nx">ele</span> <span class="o">==</span> <span class="s2">&quot;mapbox_Image&quot;</span><span class="p">)</span> <span class="p">{</span>
        <span class="nx">Baselayer</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">tileLayer</span><span class="p">(</span><span class="nx">urlTemplate</span><span class="p">.</span><span class="nx">mapbox_Image</span><span class="p">,</span> <span class="p">{</span>
            <span class="nx">maxZoom</span><span class="o">:</span> <span class="mi">17</span><span class="p">,</span>
            <span class="nx">minZoom</span><span class="o">:</span> <span class="mi">2</span>
        <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
    <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="nx">ele</span> <span class="o">==</span> <span class="s2">&quot;mapbox_Vector&quot;</span><span class="p">)</span> <span class="p">{</span>
        <span class="nx">Baselayer</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">tileLayer</span><span class="p">(</span><span class="nx">urlTemplate</span><span class="p">.</span><span class="nx">mapbox_Vector</span><span class="p">,</span> <span class="p">{</span>
            <span class="nx">maxZoom</span><span class="o">:</span> <span class="mi">17</span><span class="p">,</span>
            <span class="c1">// minZoom: 2</span>
        <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
        <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">Baselayer</span><span class="p">)</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>

<h3 id="demo-1-h5-geolocation-api-demo-11">基于 Demo 1 利用 H5 Geolocation API 定位到当前位置 <a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/demo1.1.html">Demo 1.1 </a><a class="headerlink" href="#demo-1-h5-geolocation-api-demo-11" title="Permanent link"></a></h3>
<p><img alt="" src="https://user-gold-cdn.xitu.io/2018/2/26/161d283e74f18d76?w=964&amp;h=480&amp;f=gif&amp;s=862550" /></p>
<ul>
<li>库引用 如上 Demo 1</li>
</ul>
<div class="codehilite"><pre><span class="c">&lt;!-- marker高亮显示库引用 --&gt;</span>
<span class="p">&lt;</span><span class="nt">link</span> <span class="na">rel</span><span class="o">=</span><span class="s">&quot;stylesheet&quot;</span> <span class="na">href</span><span class="o">=</span><span class="s">&quot;./lib/leaflet.marker.highlight/leaflet.marker.highlight.css&quot;</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./lib/leaflet.marker.highlight/leaflet.marker.highlight.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
</pre></div>

<ul>
<li>判断浏览器是否支持</li>
</ul>
<div class="codehilite"><pre>    <span class="kd">let</span> <span class="nx">map</span><span class="p">;</span>
    <span class="kd">let</span> <span class="nx">Baselayer</span><span class="p">;</span>
    <span class="c1">// 使用H5 API定位 定位在当前位置</span>
    <span class="k">if</span> <span class="p">(</span><span class="nx">navigator</span><span class="p">.</span><span class="nx">geolocation</span><span class="p">)</span> <span class="p">{</span>
        <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">&#39;/* 地理位置服务可用 */&#39;</span><span class="p">)</span>
        <span class="nx">navigator</span><span class="p">.</span><span class="nx">geolocation</span><span class="p">.</span><span class="nx">getCurrentPosition</span><span class="p">(</span><span class="nx">h5ApiSuccess</span><span class="p">,</span> <span class="nx">h5ApiError</span><span class="p">);</span>
    <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
        <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">&#39;/* 地理位置服务不可用 */&#39;</span><span class="p">)</span>
        <span class="nx">mapInit</span><span class="p">([</span><span class="mf">30.374558</span><span class="p">,</span> <span class="mf">104.09144</span><span class="p">]);</span><span class="c1">//指定一个数据 定位在成都北纬N30°37′45.58″ 东经E104°09′1.44″</span>
    <span class="p">}</span>
</pre></div>

<ul>
<li>定位成功或失败</li>
</ul>
<div class="codehilite"><pre>    <span class="kr">const</span> <span class="nx">h5ApiSuccess</span> <span class="o">=</span> <span class="p">(</span><span class="nx">position</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
        <span class="kd">let</span> <span class="nx">latitude</span> <span class="o">=</span> <span class="nx">position</span><span class="p">.</span><span class="nx">coords</span><span class="p">.</span><span class="nx">latitude</span><span class="p">;</span> <span class="c1">//纬度</span>
        <span class="kd">let</span> <span class="nx">longitude</span> <span class="o">=</span> <span class="nx">position</span><span class="p">.</span><span class="nx">coords</span><span class="p">.</span><span class="nx">longitude</span><span class="p">;</span> <span class="c1">//经度</span>
        <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">&#39;你的经度纬度分别为&#39;</span> <span class="o">+</span> <span class="nx">longitude</span> <span class="o">+</span> <span class="s1">&#39;,&#39;</span> <span class="o">+</span> <span class="nx">latitude</span> <span class="o">+</span> <span class="s1">&#39;。&#39;</span><span class="p">)</span>
        <span class="k">return</span> <span class="nx">mapInit</span><span class="p">([</span><span class="nx">latitude</span><span class="p">,</span> <span class="nx">longitude</span><span class="p">]);</span>
    <span class="p">};</span>

    <span class="kr">const</span> <span class="nx">h5ApiError</span> <span class="o">=</span> <span class="p">()</span> <span class="o">=&gt;</span> <span class="p">{</span>
        <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">&#39;/* 地理位置请求失败 */&#39;</span><span class="p">)</span>
        <span class="nx">mapInit</span><span class="p">([</span><span class="mf">30.374558</span><span class="p">,</span> <span class="mf">104.09144</span><span class="p">]);</span><span class="c1">//指定一个数据 定位在成都北纬N30°37′45.58″ 东经E104°09′1.44″</span>
    <span class="p">};</span>
</pre></div>

<ul>
<li>成功后初始化底图</li>
</ul>
<div class="codehilite"><pre>    <span class="kr">const</span> <span class="nx">mapInit</span> <span class="o">=</span> <span class="p">(</span><span class="nx">LatLng</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
        <span class="nx">map</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="s2">&quot;mapDiv&quot;</span><span class="p">,</span> <span class="p">{</span>
            <span class="nx">crs</span><span class="o">:</span> <span class="nx">L</span><span class="p">.</span><span class="nx">CRS</span><span class="p">.</span><span class="nx">EPSG3857</span><span class="p">,</span> <span class="c1">//要使用的坐标参考系统，默认的坐标参考系</span>
            <span class="c1">// crs: L.CRS.EPSG4326, //国内的坐标参考系</span>
            <span class="nx">zoomControl</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
            <span class="c1">// minZoom: 1,</span>
            <span class="nx">attributionControl</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
        <span class="p">}).</span><span class="nx">setView</span><span class="p">(</span><span class="nx">LatLng</span><span class="p">,</span> <span class="mi">18</span><span class="p">);</span><span class="c1">//定位在当前位置</span>
        <span class="nx">Baselayer</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">tileLayer</span><span class="p">(</span><span class="nx">urlTemplate</span><span class="p">.</span><span class="nx">mapbox_Image</span><span class="p">,</span> <span class="p">{</span>
            <span class="nx">maxZoom</span><span class="o">:</span> <span class="mi">17</span><span class="p">,</span> <span class="c1">//最大视图</span>
            <span class="nx">minZoom</span><span class="o">:</span> <span class="mi">2</span><span class="p">,</span> <span class="c1">//最小视图</span>
            <span class="nx">attribution</span><span class="o">:</span> <span class="s1">&#39;liuvigongzuoshi@foxmail.com  &amp;copy; &lt;a href=&quot;https://github.com/liuvigongzuoshi/WebGIS-for-learnning/tree/master/Leaflet_Demo&quot;&gt;WebGIS-for-learnning&lt;/a&gt;&#39;</span>
        <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>

        <span class="nx">L</span><span class="p">.</span><span class="nx">marker</span><span class="p">(</span><span class="nx">LatLng</span><span class="p">,</span> <span class="p">{</span>
            <span class="nx">highlight</span><span class="o">:</span> <span class="s2">&quot;permanent&quot;</span> <span class="c1">//永久高亮显示</span>
        <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
    <span class="p">}</span>
</pre></div>

<blockquote>
<ul>
<li>更多了解 geolocation 对象，可参考<a href="https://developer.mozilla.org/zh-CN/docs/Web/API/Geolocation/Using_geolocation">MDN Web 文档</a></li>
<li>更多了解使用 marker 高亮显示，可参考<a href="https://github.com/brandonxiang/leaflet.marker.highlight">leaflet.marker.highlight</a>插件</li>
<li>基于 Demo 1 利用 leaflet 封装好的 H5 定位 API,定位到当前位置 <a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/demo1.2.html">Demo</a></li>
</ul>
</blockquote>
<h3 id="part-2-demo-2">PART 2： 地图操作（缩放、平移、定位/书签、动画） <a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/demo2.html">Demo 2 </a><a class="headerlink" href="#part-2-demo-2" title="Permanent link"></a></h3>
<p><img alt="" src="https://user-gold-cdn.xitu.io/2018/2/28/161dcd420e164009?w=964&amp;h=480&amp;f=gif&amp;s=2119022" /></p>
<ul>
<li>
<p>库引用 如上 Demo 1</p>
</li>
<li>
<p>设置地图缩放到指定图层</p>
</li>
</ul>
<div class="codehilite"><pre><span class="nx">map</span><span class="p">.</span><span class="nx">setZoom</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="p">{</span>
  <span class="c1">// animate: false</span>
<span class="p">})</span>  <span class="c1">//设置地图缩放到</span>
</pre></div>

<ul>
<li>图层往里进一个图层，放大</li>
</ul>
<div class="codehilite"><pre><span class="nx">map</span><span class="p">.</span><span class="nx">zoomIn</span><span class="p">()</span> <span class="c1">//图层往里进一个图层，放大</span>
<span class="c1">//map.zoomOut()  //图层往里出一个图层，缩小</span>
</pre></div>

<ul>
<li>地图平移至中心点</li>
</ul>
<div class="codehilite"><pre><span class="nx">map</span><span class="p">.</span><span class="nx">panTo</span><span class="p">([</span><span class="mf">37.91082</span><span class="p">,</span> <span class="mf">128.73583</span><span class="p">],</span> <span class="p">{</span>
    <span class="nx">animate</span><span class="o">:</span> <span class="kc">true</span>
<span class="p">})</span> <span class="c1">//地图平移，默认就是true，将地图平移到给定的中心。如果新的中心点在屏幕内与现有的中心点不同则产生平移动作。</span>
</pre></div>

<ul>
<li>地图飞到中心点</li>
</ul>
<div class="codehilite"><pre><span class="nx">map</span><span class="p">.</span><span class="nx">flyTo</span><span class="p">([</span><span class="mf">36.52</span><span class="p">,</span> <span class="mf">120.31</span><span class="p">]);</span> <span class="c1">// 点到点的抛物线动画，平移加缩放动画</span>
</pre></div>

<blockquote>
<p>注意：尽量避免 setZoom()等地图缩放方法与 flyTo、flyToBounds 一起合用，因为这两类地图操作方法都有各自的缩放值，造成动画不流畅、不能定位到目的点。</p>
</blockquote>
<ul>
<li>地图飞到边界的合适的位置</li>
</ul>
<div class="codehilite"><pre><span class="nx">map</span><span class="p">.</span><span class="nx">flyToBounds</span><span class="p">(</span><span class="nx">polygon</span><span class="p">.</span><span class="nx">getBounds</span><span class="p">());</span>   <span class="c1">//getBounds（获取边界）：返回地图视图的经纬度边界。</span>
    <span class="c1">//飞到这个多变形区域上面，自动判断区域块的大小，合适缩放图层，将地图视图尽可能大地设定在给定的地理边界内。</span>

<span class="kd">let</span> <span class="nx">polygon</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">polygon</span><span class="p">(</span>
          <span class="p">[[</span><span class="mi">37</span><span class="p">,</span> <span class="o">-</span><span class="mf">109.05</span><span class="p">],</span>
          <span class="p">[</span><span class="mi">41</span><span class="p">,</span> <span class="o">-</span><span class="mf">109.03</span><span class="p">],</span>
          <span class="p">[</span><span class="mi">41</span><span class="p">,</span> <span class="o">-</span><span class="mf">102.05</span><span class="p">],</span>
          <span class="p">[</span><span class="mi">37</span><span class="p">,</span> <span class="o">-</span><span class="mf">102.04</span><span class="p">]],</span>
     <span class="p">[</span><span class="mf">40.774</span><span class="p">,</span> <span class="o">-</span><span class="mf">74.125</span><span class="p">],</span> <span class="p">{</span>
       <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;green&#39;</span><span class="p">,</span>
       <span class="nx">fillColor</span><span class="o">:</span> <span class="s1">&#39;#f03&#39;</span><span class="p">,</span>
       <span class="nx">fillOpacity</span><span class="o">:</span> <span class="mf">0.5</span>
    <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>  <span class="c1">//地图上绘制一个多形</span>
</pre></div>

<ul>
<li>地图定位到边界的合适的位置</li>
</ul>
<div class="codehilite"><pre><span class="nx">map</span><span class="p">.</span><span class="nx">fitBounds</span><span class="p">(</span><span class="nx">polygon</span><span class="p">.</span><span class="nx">getBounds</span><span class="p">());</span>  <span class="c1">//getBounds（获取边界）：返回地图视图的经纬度边界。</span>
  <span class="c1">//平移到一个区域上面，自动判断区域块的大小，合适缩放图层</span>

<span class="kd">let</span> <span class="nx">polygon</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">polygon</span><span class="p">(</span>
          <span class="p">[[</span><span class="mi">37</span><span class="p">,</span> <span class="o">-</span><span class="mf">109.05</span><span class="p">],</span>
          <span class="p">[</span><span class="mi">41</span><span class="p">,</span> <span class="o">-</span><span class="mf">109.03</span><span class="p">],</span>
          <span class="p">[</span><span class="mi">41</span><span class="p">,</span> <span class="o">-</span><span class="mf">102.05</span><span class="p">],</span>
          <span class="p">[</span><span class="mi">37</span><span class="p">,</span> <span class="o">-</span><span class="mf">102.04</span><span class="p">]],</span>
     <span class="p">[</span><span class="mf">40.774</span><span class="p">,</span> <span class="o">-</span><span class="mf">74.125</span><span class="p">],</span> <span class="p">{</span>
       <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;green&#39;</span><span class="p">,</span>
       <span class="nx">fillColor</span><span class="o">:</span> <span class="s1">&#39;#f03&#39;</span><span class="p">,</span>
       <span class="nx">fillOpacity</span><span class="o">:</span> <span class="mf">0.5</span>
    <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>  <span class="c1">//地图上绘制一个多边形</span>
</pre></div>

<h3 id="part-3-demo-3">PART 3： 图层管理（加载、移除、调整顺序）： <a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/demo3.html">Demo 3 </a><a class="headerlink" href="#part-3-demo-3" title="Permanent link"></a></h3>
<p><img alt="" src="https://user-gold-cdn.xitu.io/2018/2/28/161dce7e881a2362?w=1920&amp;h=959&amp;f=jpeg&amp;s=2962698" /></p>
<ul>
<li>库引用</li>
</ul>
<div class="codehilite"><pre><span class="p">&lt;</span><span class="nt">link</span> <span class="na">rel</span><span class="o">=</span><span class="s">&quot;stylesheet&quot;</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;text/css&quot;</span>  <span class="na">href</span><span class="o">=</span><span class="s">&quot;./lib/Flat-UI-master/dist/css/vendor/bootstrap/css/bootstrap.min.css&quot;</span>
    <span class="p">/&gt;</span>
<span class="p">&lt;</span><span class="nt">link</span> <span class="na">rel</span><span class="o">=</span><span class="s">&quot;stylesheet&quot;</span> <span class="na">href</span><span class="o">=</span><span class="s">&quot;./lib/Flat-UI-master/dist/css/flat-ui.min.css&quot;</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">link</span> <span class="na">rel</span><span class="o">=</span><span class="s">&quot;stylesheet&quot;</span> <span class="na">href</span><span class="o">=</span><span class="s">&quot;./lib/leaflet/leaflet.css&quot;</span><span class="p">&gt;</span>
</pre></div>

<div class="codehilite"><pre><span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./lib/Flat-UI-master/dist/js/vendor/jquery.min.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./lib/Flat-UI-master/dist/js/flat-ui.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./lib/leaflet/leaflet.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
<span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./lib/esri-leaflet-v2.1.2/dist/esri-leaflet.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span> <span class="c">&lt;!-- esri-leafleat插件 --&gt;</span>
<span class="p">&lt;</span><span class="nt">script</span> <span class="na">src</span><span class="o">=</span><span class="s">&quot;./js/urlTemplate.js&quot;</span><span class="p">&gt;&lt;/</span><span class="nt">script</span><span class="p">&gt;</span>
</pre></div>

<ul>
<li>使用 esri-leaflet 插件加载 ArcGIS 底图服务</li>
</ul>
<div class="codehilite"><pre><span class="kd">let</span> <span class="nx">oMap</span> <span class="o">=</span> <span class="kc">null</span><span class="p">;</span>
    <span class="kd">let</span> <span class="nx">oLayer</span> <span class="o">=</span> <span class="p">[];</span>

    <span class="nx">oMap</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="s1">&#39;mapDiv&#39;</span><span class="p">,</span> <span class="p">{</span>
        <span class="nx">crs</span><span class="o">:</span> <span class="nx">L</span><span class="p">.</span><span class="nx">CRS</span><span class="p">.</span><span class="nx">EPSG4326</span><span class="p">,</span>
        <span class="nx">zoomControl</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span>
        <span class="nx">minZoom</span><span class="o">:</span> <span class="mi">7</span><span class="p">,</span>
        <span class="nx">attributionControl</span><span class="o">:</span> <span class="kc">false</span>
    <span class="p">}).</span><span class="nx">setView</span><span class="p">([</span><span class="mf">29.59</span><span class="p">,</span> <span class="mf">106.59</span><span class="p">],</span> <span class="mi">12</span><span class="p">);</span> <span class="c1">//定位在重庆</span>

    <span class="nx">oLayer</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span><span class="nx">L</span><span class="p">.</span><span class="nx">esri</span><span class="p">.</span><span class="nx">tiledMapLayer</span><span class="p">({</span>
        <span class="nx">url</span><span class="o">:</span> <span class="nx">urlTemplate</span><span class="p">.</span><span class="nx">SYS_CQMap_IMG_MAPSERVER_PATH</span><span class="p">,</span>
        <span class="nx">maxZoom</span><span class="o">:</span> <span class="mi">17</span><span class="p">,</span>
        <span class="nx">minZoom</span><span class="o">:</span> <span class="mi">0</span><span class="p">,</span>
        <span class="nx">useCors</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> <span class="c1">//是否浏览器在跨域的情况下使用GET请求。</span>
    <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">oMap</span><span class="p">));</span> <span class="c1">//加载第一个底图</span>

    <span class="nx">oLayer</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span><span class="nx">L</span><span class="p">.</span><span class="nx">esri</span><span class="p">.</span><span class="nx">tiledMapLayer</span><span class="p">({</span>
        <span class="nx">url</span><span class="o">:</span> <span class="nx">urlTemplate</span><span class="p">.</span><span class="nx">SYS_CQMap_IMG_LABEL_MAPSERVER_PATH</span><span class="p">,</span>
        <span class="nx">maxZoom</span><span class="o">:</span> <span class="mi">17</span><span class="p">,</span>
        <span class="nx">minZoom</span><span class="o">:</span> <span class="mi">0</span><span class="p">,</span>
        <span class="nx">useCors</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span>
    <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">oMap</span><span class="p">));</span>  <span class="c1">//加载第二个底图</span>
</pre></div>

<ul>
<li>切换底图(移除及加载)</li>
</ul>
<div class="codehilite"><pre><span class="kr">const</span> <span class="nx">setLayer</span> <span class="o">=</span> <span class="p">(</span><span class="nx">layerUrls</span><span class="p">,</span> <span class="nx">maxZoom</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
        <span class="k">for</span> <span class="p">(</span><span class="kd">let</span> <span class="nx">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="o">&lt;</span> <span class="nx">oLayer</span><span class="p">.</span><span class="nx">length</span><span class="p">;</span> <span class="nx">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
            <span class="nx">oMap</span><span class="p">.</span><span class="nx">removeLayer</span><span class="p">(</span><span class="nx">oLayer</span><span class="p">[</span><span class="nx">i</span><span class="p">])</span> <span class="c1">//将图层在地图上移除</span>
        <span class="p">}</span>
        <span class="nx">oLayer</span> <span class="o">=</span> <span class="p">[]</span> <span class="c1">//制空数组</span>
        <span class="nx">layerUrls</span><span class="p">.</span><span class="nx">map</span><span class="p">((</span><span class="nx">item</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
            <span class="nx">oLayer</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span><span class="nx">L</span><span class="p">.</span><span class="nx">esri</span><span class="p">.</span><span class="nx">tiledMapLayer</span><span class="p">({</span>
                <span class="nx">url</span><span class="o">:</span> <span class="nx">item</span><span class="p">,</span>
                <span class="nx">useCors</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span>
                <span class="nx">maxZoom</span><span class="o">:</span> <span class="nx">maxZoom</span><span class="p">,</span> <span class="c1">// 设置最大放大图层值</span>
            <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">oMap</span><span class="p">));</span>
        <span class="p">})</span>
    <span class="p">}</span>
</pre></div>

<blockquote>
<p>不同的底图可能图层数不一样，就可能造成浏览器去请求不存在的图层，以及给用户展示出空白区域的不好体验，所以切换图层时候应注意设置最大及最小缩放值。</p>
</blockquote>
<h3 id="part-4-demo-4">PART 4： 要素标绘（点、线、面，符号化/静态动态） <a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/demo4.html">Demo 4 </a><a class="headerlink" href="#part-4-demo-4" title="Permanent link"></a></h3>
<p><img alt="" src="https://user-gold-cdn.xitu.io/2018/2/28/161dcf0290ac287b?w=964&amp;h=480&amp;f=gif&amp;s=3275194" /></p>
<ul>
<li>库引用 如上 Demo 1</li>
<li>画一个圆</li>
</ul>
<div class="codehilite"><pre><span class="c1">// 画一个circle</span>
<span class="kr">const</span> <span class="nx">circle</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">circle</span><span class="p">([</span><span class="mf">36.52</span><span class="p">,</span> <span class="mf">120.31</span><span class="p">],</span> <span class="p">{</span>
  <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;green&#39;</span><span class="p">,</span> <span class="c1">//描边色</span>
  <span class="nx">fillColor</span><span class="o">:</span> <span class="s1">&#39;#f03&#39;</span><span class="p">,</span>  <span class="c1">//填充色</span>
  <span class="nx">fillOpacity</span><span class="o">:</span> <span class="mf">0.5</span><span class="p">,</span> <span class="c1">//透明度</span>
  <span class="nx">radius</span><span class="o">:</span> <span class="mi">10000</span> <span class="c1">//半径，单位米</span>
<span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
<span class="c1">// 绑定一个提示标签</span>
<span class="nx">circle</span><span class="p">.</span><span class="nx">bindTooltip</span><span class="p">(</span><span class="s1">&#39;我是个圆&#39;</span><span class="p">);</span>
</pre></div>

<ul>
<li>Maker 及自定义 Maker</li>
</ul>
<div class="codehilite"><pre><span class="c1">// 做一个maker</span>
<span class="kr">const</span> <span class="nx">marker</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">marker</span><span class="p">([</span><span class="mf">36.52</span><span class="p">,</span> <span class="mf">120.31</span><span class="p">]).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
<span class="c1">// 绑定一个提示标签</span>
<span class="nx">marker</span><span class="p">.</span><span class="nx">bindTooltip</span><span class="p">(</span><span class="s1">&#39;这是个Marker&#39;</span><span class="p">,</span> <span class="p">{</span> <span class="nx">direction</span><span class="o">:</span> <span class="s1">&#39;left&#39;</span> <span class="p">}).</span><span class="nx">openTooltip</span><span class="p">();</span>


<span class="c1">//自定义一个maker</span>
<span class="kr">const</span> <span class="nx">greenIcon</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">icon</span><span class="p">({</span>
  <span class="nx">iconUrl</span><span class="o">:</span> <span class="s1">&#39;./icon/logo.png&#39;</span><span class="p">,</span>
  <span class="nx">iconSize</span><span class="o">:</span> <span class="p">[</span><span class="mi">300</span><span class="p">,</span> <span class="mi">79</span><span class="p">],</span> <span class="c1">// size of the icon</span>
  <span class="nx">popupAnchor</span><span class="o">:</span> <span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="o">-</span><span class="mi">10</span><span class="p">]</span> <span class="c1">// point from which the popup should open relative to the iconAnchor</span>
<span class="p">});</span>

<span class="kr">const</span> <span class="nx">oMarker</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">marker</span><span class="p">([</span><span class="mf">36.52</span><span class="p">,</span> <span class="mf">124.31</span><span class="p">],</span> <span class="p">{</span> <span class="nx">icon</span><span class="o">:</span> <span class="nx">greenIcon</span> <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
<span class="c1">// 绑定一个提示标签</span>
<span class="nx">oMarker</span><span class="p">.</span><span class="nx">bindTooltip</span><span class="p">(</span><span class="s1">&#39;这是个自定义Marker&#39;</span><span class="p">,</span> <span class="p">{</span> <span class="nx">direction</span><span class="o">:</span> <span class="s1">&#39;left&#39;</span><span class="p">,</span> <span class="nx">offset</span><span class="o">:</span> <span class="p">[</span><span class="o">-</span><span class="mi">150</span><span class="p">,</span> <span class="mi">0</span><span class="p">]</span> <span class="p">});</span>
</pre></div>

<ul>
<li>画一根线</li>
</ul>
<div class="codehilite"><pre><span class="c1">//画一根线</span>
<span class="kr">const</span> <span class="nx">polyline</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">polyline</span><span class="p">([[</span><span class="mf">45.51</span><span class="p">,</span> <span class="o">-</span><span class="mf">122.68</span><span class="p">],</span> <span class="p">[</span><span class="mf">37.77</span><span class="p">,</span> <span class="o">-</span><span class="mf">122.43</span><span class="p">],</span> <span class="p">[</span><span class="mf">34.04</span><span class="p">,</span> <span class="o">-</span><span class="mf">118.2</span><span class="p">]],</span> <span class="p">{</span> <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;red&#39;</span> <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
<span class="c1">// 飞到这个线的位置</span>
<span class="c1">// map.fitBounds(polyline.getBounds());</span>
</pre></div>

<ul>
<li>画一个多边形</li>
</ul>
<div class="codehilite"><pre><span class="c1">// 画一个polygon</span>
<span class="kr">const</span> <span class="nx">polygon</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">polygon</span><span class="p">([</span>
  <span class="p">[[</span><span class="mi">37</span><span class="p">,</span> <span class="o">-</span><span class="mf">109.05</span><span class="p">],</span> <span class="p">[</span><span class="mi">41</span><span class="p">,</span> <span class="o">-</span><span class="mf">109.03</span><span class="p">],</span> <span class="p">[</span><span class="mi">41</span><span class="p">,</span> <span class="o">-</span><span class="mf">102.05</span><span class="p">],</span> <span class="p">[</span><span class="mi">37</span><span class="p">,</span> <span class="o">-</span><span class="mf">102.04</span><span class="p">]],</span> <span class="c1">// outer ring</span>
  <span class="p">[[</span><span class="mf">37.29</span><span class="p">,</span> <span class="o">-</span><span class="mf">108.58</span><span class="p">],</span> <span class="p">[</span><span class="mf">40.71</span><span class="p">,</span> <span class="o">-</span><span class="mf">108.58</span><span class="p">],</span> <span class="p">[</span><span class="mf">40.71</span><span class="p">,</span> <span class="o">-</span><span class="mf">102.50</span><span class="p">],</span> <span class="p">[</span><span class="mf">37.29</span><span class="p">,</span> <span class="o">-</span><span class="mf">102.50</span><span class="p">]]</span> <span class="c1">// hole</span>
<span class="p">],</span> <span class="p">{</span>
    <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;green&#39;</span><span class="p">,</span>
    <span class="nx">fillColor</span><span class="o">:</span> <span class="s1">&#39;#f03&#39;</span><span class="p">,</span>
    <span class="nx">fillOpacity</span><span class="o">:</span> <span class="mf">0.5</span>
  <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
<span class="c1">// 绑定一个提示标签</span>
<span class="nx">polygon</span><span class="p">.</span><span class="nx">bindTooltip</span><span class="p">(</span><span class="s1">&#39;this is 个多边形&#39;</span><span class="p">);</span>
<span class="c1">// 飞到这个多边形的位置</span>
<span class="c1">// map.fitBounds(polygon.getBounds());</span>
</pre></div>

<h3 id="part-5-popup-demo-5">PART 5： 信息窗口（入口、Popup、定制） <a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/demo5.html">Demo 5 </a><a class="headerlink" href="#part-5-popup-demo-5" title="Permanent link"></a></h3>
<p><img alt="" src="https://user-gold-cdn.xitu.io/2018/2/28/161dd0f8edbe36e5?w=964&amp;h=480&amp;f=gif&amp;s=3360015" /></p>
<ul>
<li>库引用 如上 Demo 1</li>
<li>画一个 circle 并绑定一个 Popup</li>
</ul>
<div class="codehilite"><pre><span class="c1">// 画一个circle</span>
<span class="kr">const</span> <span class="nx">circle</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">circle</span><span class="p">([</span><span class="mf">36.92</span><span class="p">,</span> <span class="mf">121.31</span><span class="p">],</span> <span class="p">{</span>
 <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;green&#39;</span><span class="p">,</span> <span class="c1">//描边色</span>
 <span class="nx">fillColor</span><span class="o">:</span> <span class="s1">&#39;#f03&#39;</span><span class="p">,</span>  <span class="c1">//填充色</span>
 <span class="nx">fillOpacity</span><span class="o">:</span> <span class="mf">0.5</span><span class="p">,</span> <span class="c1">//透明度</span>
 <span class="nx">radius</span><span class="o">:</span> <span class="mi">10000</span> <span class="c1">//半径，单位米</span>
<span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>

<span class="c1">// 绑定一个弹窗</span>
<span class="nx">circle</span><span class="p">.</span><span class="nx">bindPopup</span><span class="p">(</span><span class="s1">&#39;我是个圆&#39;</span><span class="p">);</span>
</pre></div>

<ul>
<li>定位一个 marker，绑定一个自定义 Popup</li>
</ul>
<div class="codehilite"><pre><span class="c1">// 定位一个maker</span>
<span class="kr">const</span> <span class="nx">marker</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">marker</span><span class="p">([</span><span class="mf">36.52</span><span class="p">,</span> <span class="mf">120.31</span><span class="p">]).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>

<span class="c1">//maker上自定义一个popup</span>
<span class="kr">const</span> <span class="nx">html</span> <span class="o">=</span> <span class="s1">&#39;&lt;p&gt;Hello world!&lt;br /&gt;This is a nice popup.&lt;/p&gt;&#39;</span><span class="p">;</span>

<span class="kr">const</span> <span class="nx">popup</span> <span class="o">=</span> <span class="nx">marker</span><span class="p">.</span><span class="nx">bindPopup</span><span class="p">(</span><span class="nx">html</span><span class="p">,</span> <span class="p">{</span> <span class="nx">maxHeight</span><span class="o">:</span> <span class="mi">250</span><span class="p">,</span> <span class="nx">maxWidth</span><span class="o">:</span> <span class="mi">490</span><span class="p">,</span> <span class="nx">className</span><span class="o">:</span> <span class="s1">&#39;content&#39;</span><span class="p">,</span> <span class="nx">offset</span><span class="o">:</span> <span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">]</span> <span class="p">}).</span><span class="nx">on</span><span class="p">(</span><span class="s1">&#39;popupopen&#39;</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">params</span><span class="p">)</span> <span class="p">{</span>
  <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">params</span><span class="p">)</span>
<span class="p">});</span>
</pre></div>

<ul>
<li>实现动态改变 Popup 的内容</li>
</ul>
<div class="codehilite"><pre><span class="kr">const</span> <span class="nx">mypop</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">popup</span><span class="p">();</span>

<span class="nx">map</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="s1">&#39;click&#39;</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
  <span class="nx">mypop</span><span class="p">.</span><span class="nx">setLatLng</span><span class="p">(</span><span class="nx">e</span><span class="p">.</span><span class="nx">latlng</span><span class="p">)</span>
    <span class="p">.</span><span class="nx">setContent</span><span class="p">(</span><span class="s1">&#39;你临幸了这个点：&lt;br&gt;&#39;</span> <span class="o">+</span> <span class="nx">e</span><span class="p">.</span><span class="nx">latlng</span><span class="p">.</span><span class="nx">toString</span><span class="p">())</span>
    <span class="p">.</span><span class="nx">openOn</span><span class="p">(</span><span class="nx">map</span><span class="p">);</span>
<span class="p">});</span>
</pre></div>

<h3 id="part-6-geojson-demo-6">PART 6： geojson 数据绘制边界(坐标转换、渲染) <a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/demo6.html">Demo 6 </a><a class="headerlink" href="#part-6-geojson-demo-6" title="Permanent link"></a></h3>
<p><img alt="" src="https://user-gold-cdn.xitu.io/2018/3/1/161dd3b18402adcc?w=964&amp;h=480&amp;f=gif&amp;s=5224505" /></p>
<ul>
<li>
<p>库引用 如上 Demo 1</p>
</li>
<li>
<p>获得 geojson 并处理数据</p>
</li>
</ul>
<div class="codehilite"><pre><span class="c1">// 请求geojson并处理数据</span>
<span class="kr">const</span> <span class="nx">population</span> <span class="o">=</span> <span class="p">()</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="nx">$</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s2">&quot;./js/geojson.json&quot;</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">response</span><span class="p">)</span> <span class="p">{</span>
        <span class="kr">const</span> <span class="nx">poplData</span> <span class="o">=</span> <span class="nx">response</span><span class="p">.</span><span class="nx">data</span>
        <span class="kr">const</span> <span class="nx">PolygonsCenter</span> <span class="o">=</span> <span class="nx">response</span><span class="p">.</span><span class="nx">geopoint</span>
        <span class="nx">drawPolygons</span><span class="p">(</span><span class="nx">poplData</span><span class="p">,</span> <span class="nx">PolygonsCenter</span><span class="p">)</span>
    <span class="p">});</span>
<span class="p">}</span>
</pre></div>

<blockquote>
<p>模拟后台返回的数据<a href="https://github.com/liuvigongzuoshi/Leaflet_Demo/blob/master/js/geojson.json">geojson</a></p>
</blockquote>
<ul>
<li>绘制边界并添加图例</li>
</ul>
<div class="codehilite"><pre><span class="kd">let</span> <span class="nx">oPolygon_VilPop</span> <span class="o">=</span> <span class="p">[];</span>

<span class="kr">const</span> <span class="nx">legend</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">control</span><span class="p">({</span>
    <span class="nx">position</span><span class="o">:</span> <span class="s1">&#39;bottomright&#39;</span>
 <span class="p">});</span>

<span class="kr">const</span> <span class="nx">drawPolygons</span> <span class="o">=</span> <span class="p">(</span><span class="nx">poplData</span><span class="p">,</span> <span class="nx">PolygonsCenter</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="k">for</span> <span class="p">(</span><span class="kr">const</span> <span class="nx">i</span> <span class="k">in</span> <span class="nx">poplData</span><span class="p">)</span> <span class="p">{</span>
        <span class="nx">poplData</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">geoJson</span> <span class="o">=</span> <span class="nx">JSON</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="nx">poplData</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">geoJson</span><span class="p">)</span>
        <span class="nx">oPolygon_VilPop</span><span class="p">[</span><span class="nx">i</span><span class="p">]</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">geoJSON</span><span class="p">(</span><span class="nx">poplData</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">geoJson</span><span class="p">,</span> <span class="p">{</span>
            <span class="nx">style</span><span class="o">:</span> <span class="kd">function</span> <span class="p">()</span> <span class="p">{</span>
                <span class="k">return</span> <span class="p">{</span>
                    <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;white&#39;</span><span class="p">,</span>
                    <span class="nx">fillColor</span><span class="o">:</span> <span class="nx">getBgColor</span><span class="p">(</span><span class="nx">poplData</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">population</span><span class="p">),</span> <span class="c1">//获取边界的填充色</span>
                    <span class="nx">fillOpacity</span><span class="o">:</span> <span class="mf">0.6</span><span class="p">,</span>
                    <span class="nx">weight</span><span class="o">:</span> <span class="mi">3</span><span class="p">,</span>
                    <span class="nx">dashArray</span><span class="o">:</span> <span class="s1">&#39;10&#39;</span>
                <span class="p">};</span>
            <span class="p">}</span>
        <span class="p">}).</span><span class="nx">bindTooltip</span><span class="p">(</span><span class="nx">poplData</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">villageName</span> <span class="o">+</span> <span class="s1">&#39;&lt;br&gt;&lt;br&gt;人口&#39;</span> <span class="o">+</span> <span class="nx">poplData</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">population</span> <span class="o">+</span> <span class="s1">&#39;人&#39;</span><span class="p">,</span> <span class="p">{</span>
            <span class="nx">direction</span><span class="o">:</span> <span class="s1">&#39;top&#39;</span>
        <span class="p">}).</span><span class="nx">on</span><span class="p">({</span>
            <span class="nx">mouseover</span><span class="o">:</span> <span class="nx">highlight</span><span class="p">,</span> <span class="c1">//鼠标移动上去高亮</span>
            <span class="nx">mouseout</span><span class="o">:</span> <span class="nx">resetHighlight</span><span class="p">,</span> <span class="c1">//鼠标移出恢复原样式</span>
            <span class="nx">click</span><span class="o">:</span> <span class="nx">zoomTo</span> <span class="c1">//点击最大化</span>
        <span class="p">}).</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">oMap</span><span class="p">);</span>
    <span class="p">}</span>

    <span class="c1">// 添加图例</span>
    <span class="nx">legend</span><span class="p">.</span><span class="nx">onAdd</span> <span class="o">=</span> <span class="nx">legendHtml</span><span class="p">;</span>
    <span class="nx">legend</span><span class="p">.</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">oMap</span><span class="p">);</span>

    <span class="c1">// 定位到该界限的中心位置</span>
    <span class="nx">oMap</span><span class="p">.</span><span class="nx">flyToBounds</span><span class="p">(</span><span class="nx">PolygonsCenter</span><span class="p">);</span>
<span class="p">}</span>

<span class="c1">// 添加图例</span>
<span class="nx">legend</span><span class="p">.</span><span class="nx">onAdd</span> <span class="o">=</span> <span class="nx">legendHtml</span><span class="p">;</span>
<span class="nx">legend</span><span class="p">.</span><span class="nx">addTo</span><span class="p">(</span><span class="nx">oMap</span><span class="p">);</span>

<span class="c1">// 定位到该界限的中心位置</span>
<span class="nx">oMap</span><span class="p">.</span><span class="nx">flyToBounds</span><span class="p">(</span><span class="nx">PolygonsCenter</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>

<ul>
<li>返回边界的填充色及图列的样式</li>
</ul>
<div class="codehilite"><pre><span class="kr">const</span> <span class="nx">getBgColor</span> <span class="o">=</span> <span class="p">(</span><span class="nx">d</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="k">return</span> <span class="nx">d</span> <span class="o">&gt;</span> <span class="mi">400</span> <span class="o">?</span> <span class="s1">&#39;#800026&#39;</span> <span class="o">:</span> <span class="nx">d</span> <span class="o">&gt;</span> <span class="mi">300</span> <span class="o">?</span> <span class="s1">&#39;#BD0026&#39;</span> <span class="o">:</span> <span class="nx">d</span> <span class="o">&gt;</span> <span class="mi">200</span> <span class="o">?</span> <span class="s1">&#39;#FC4E2A&#39;</span> <span class="o">:</span> <span class="nx">d</span> <span class="o">&gt;</span> <span class="mi">100</span> <span class="o">?</span> <span class="s1">&#39;#FD8D3C&#39;</span> <span class="o">:</span> <span class="nx">d</span> <span class="o">&gt;</span> <span class="mi">50</span> <span class="o">?</span> <span class="s1">&#39;#FED976&#39;</span> <span class="o">:</span> <span class="s1">&#39;#FFEDA0&#39;</span><span class="p">;</span>
<span class="p">}</span>

<span class="kr">const</span> <span class="nx">legendHtml</span> <span class="o">=</span> <span class="p">(</span><span class="nx">map</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="kd">let</span> <span class="nx">div</span> <span class="o">=</span> <span class="nx">L</span><span class="p">.</span><span class="nx">DomUtil</span><span class="p">.</span><span class="nx">create</span><span class="p">(</span><span class="s1">&#39;div&#39;</span><span class="p">,</span> <span class="s1">&#39;legend locateVP_legend&#39;</span><span class="p">),</span>
        <span class="nx">grades</span> <span class="o">=</span> <span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">200</span><span class="p">,</span> <span class="mi">400</span><span class="p">],</span>
        <span class="nx">labels</span> <span class="o">=</span> <span class="p">[],</span>
        <span class="nx">from</span><span class="p">,</span> <span class="nx">to</span><span class="p">;</span>
    <span class="k">for</span> <span class="p">(</span><span class="kd">let</span> <span class="nx">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="o">&lt;</span> <span class="nx">grades</span><span class="p">.</span><span class="nx">length</span><span class="p">;</span> <span class="nx">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
        <span class="nx">from</span> <span class="o">=</span> <span class="nx">grades</span><span class="p">[</span><span class="nx">i</span><span class="p">];</span>
        <span class="nx">to</span> <span class="o">=</span> <span class="nx">grades</span><span class="p">[</span><span class="nx">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">];</span>
        <span class="nx">labels</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span>
            <span class="s1">&#39;&lt;i style=&quot;background:&#39;</span> <span class="o">+</span> <span class="nx">getBgColor</span><span class="p">(</span><span class="nx">from</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span> <span class="o">+</span> <span class="s1">&#39;&quot;&gt;&lt;/i&gt; &#39;</span> <span class="o">+</span>
            <span class="nx">from</span> <span class="o">+</span> <span class="p">(</span><span class="nx">to</span> <span class="o">?</span> <span class="s1">&#39; &amp;sim; &#39;</span> <span class="o">+</span> <span class="nx">to</span> <span class="o">+</span> <span class="s1">&#39;人&#39;</span> <span class="o">:</span> <span class="s1">&#39;以上&#39;</span><span class="p">));</span>
    <span class="p">}</span>
    <span class="nx">div</span><span class="p">.</span><span class="nx">innerHTML</span> <span class="o">=</span> <span class="nx">labels</span><span class="p">.</span><span class="nx">join</span><span class="p">(</span><span class="s1">&#39;&lt;br&gt;&#39;</span><span class="p">);</span>
    <span class="k">return</span> <span class="nx">div</span><span class="p">;</span>
    <span class="p">};</span>
</pre></div>

<ul>
<li>鼠标移动上去的事件、鼠标移出的事件、发生点击的事件</li>
</ul>
<div class="codehilite"><pre><span class="kr">const</span> <span class="nx">highlight</span> <span class="o">=</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="kd">let</span> <span class="nx">layer</span> <span class="o">=</span> <span class="nx">e</span><span class="p">.</span><span class="nx">target</span><span class="p">;</span>
    <span class="nx">layer</span><span class="p">.</span><span class="nx">setStyle</span><span class="p">({</span>
        <span class="nx">weight</span><span class="o">:</span> <span class="mi">6</span><span class="p">,</span>
        <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;#fff&#39;</span><span class="p">,</span>
        <span class="nx">fillOpacity</span><span class="o">:</span> <span class="mf">0.9</span><span class="p">,</span>
        <span class="nx">dashArray</span><span class="o">:</span> <span class="s1">&#39;0&#39;</span>
    <span class="p">})</span>
<span class="p">}</span>

<span class="kr">const</span> <span class="nx">resetHighlight</span> <span class="o">=</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="kd">let</span> <span class="nx">layer</span> <span class="o">=</span> <span class="nx">e</span><span class="p">.</span><span class="nx">target</span><span class="p">;</span>
    <span class="nx">layer</span><span class="p">.</span><span class="nx">setStyle</span><span class="p">({</span>
        <span class="nx">color</span><span class="o">:</span> <span class="s1">&#39;white&#39;</span><span class="p">,</span>
        <span class="nx">weight</span><span class="o">:</span> <span class="mi">3</span><span class="p">,</span>
        <span class="nx">fillOpacity</span><span class="o">:</span> <span class="mf">0.6</span><span class="p">,</span>
        <span class="nx">dashArray</span><span class="o">:</span> <span class="s1">&#39;10&#39;</span>
    <span class="p">})</span>
<span class="p">}</span>

<span class="kr">const</span> <span class="nx">zoomTo</span> <span class="o">=</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
    <span class="nx">oMap</span><span class="p">.</span><span class="nx">fitBounds</span><span class="p">(</span><span class="nx">e</span><span class="p">.</span><span class="nx">target</span><span class="p">.</span><span class="nx">getBounds</span><span class="p">());</span>
<span class="p">}</span>
</pre></div>

<h3 id="_1">写在后面<a class="headerlink" href="#_1" title="Permanent link"></a></h3>
<h4 id="_2">国内常用地图服务资源加载插件<a class="headerlink" href="#_2" title="Permanent link"></a></h4>
<blockquote>
<p>Leaflet.ChineseTmsProviders <a href="https://github.com/htoooth/Leaflet.ChineseTmsProviders">Provider for Chinese Tms Service</a></p>
</blockquote>
<ul>
<li>
<p>Leaflet 调用国内各种地图的功能十分复杂，幸好有 leaflet.ChineseTmsProviders 这个插件，这四种地图直接就可以加载进来，十分方便。</p>
</li>
<li>
<p>使用方法很简单可点击上面链接去 GitHub 看使用说明，或拉<a href="https://github.com/liuvigongzuoshi/WebGIS-for-learnning/tree/master/Leaflet.ChineseTmsProviders_Demo">这个 demo</a>下来来瞧一瞧代码。</p>
</li>
</ul>
<h4 id="marker">优化 marker 相关的插件<a class="headerlink" href="#marker" title="Permanent link"></a></h4>
<ul>
<li>
<p>提供了丰富多彩的图标 <a href="https://github.com/lvoogdt/Leaflet.awesome-markers">Leaflet.awesome-markers</a>, See the <a href="http://jsfiddle.net/VPzu4/92/">demo map</a></p>
</li>
<li>
<p>强大的集聚插件 <a href="https://github.com/Leaflet/Leaflet.markercluster">Leaflet.markercluster</a>, See the <a href="https://leaflet.github.io/Leaflet.markercluster/example/marker-clustering-realworld.388.html">demo map</a></p>
</li>
<li>
<p>优化的 label <a href="https://github.com/Leaflet/Leaflet.label">Leaflet.label</a>, See the <a href="http://leaflet.github.io/Leaflet.label/">demo map</a></p>
</li>
<li>
<p>优化重叠在一起的 markers <a href="https://github.com/jawj/OverlappingMarkerSpiderfier-Leaflet">OverlappingMarkerSpiderfier-Leaflet</a>, See the <a href="http://jawj.github.io/OverlappingMarkerSpiderfier-Leaflet/demo.html">demo map</a></p>
</li>
<li>
<p>优化在边框上显示不在当前视野中的 marker <a href="https://github.com/ubergesundheit/Leaflet.EdgeMarker">Leaflet.EdgeMarker</a>, See the <a href="http://ubergesundheit.github.io/Leaflet.EdgeMarker/">demo map</a></p>
</li>
</ul>
<h4 id="_3">模块化开发的加载包注意的问题<a class="headerlink" href="#_3" title="Permanent link"></a></h4>
<ul>
<li>引 leaflet 包的时候不要忘记引用包里的 css <code>import 'leaflet/dist/leaflet.css';</code></li>
</ul>
<h4 id="leaflet-esri-leaflet-lesritiledmaplayer-arcgis-uncaught-referenceerror-proj4-is-not-defined">关于 Leaflet 和 esri-leaflet 一起使用 L.esri.TiledMapLayer 加载 ArcGIS 服务切片底图时，控制台打印报错 <code>Uncaught ReferenceError: proj4 is not defined</code><a class="headerlink" href="#leaflet-esri-leaflet-lesritiledmaplayer-arcgis-uncaught-referenceerror-proj4-is-not-defined" title="Permanent link"></a></h4>
<ul>
<li>查看了下源码 <code>if (!proj4) { warn('L.esri.TiledMapLayer is using a non-mercator spatial reference. Support may be available through Proj4Leaflet http://esri.github.io/esri-leaflet/examples/non-mercator-projection.html');}</code> 问题就出在这里，esri-leaflet 里的一个插件 proj4leaflet 依赖<a href="https://github.com/proj4js/proj4js">proj4</a>，所以需要手动引入 proj4 这个包。</li>
<li>这个 GitHub 上面的提问及回答 <a href="https://github.com/Esri/esri-leaflet/issues/1019">Github esri-leaflet Issues</a></li>
<li>如果你是模块化开发，需要再<code>npm i proj4</code> 然后再引入进来好了 <code>import * as proj4 from 'proj4'; window['proj4'] = proj4;</code></li>
<li>如果你是常规开发，直接添加一个 script 标签引用 CDN 资源上托管的<a href="https://cdnjs.com/libraries/proj4js">Proj4js</a>就是了 <code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.4.4/proj4-src.js"&gt;&lt;/script&gt;</code></li>
</ul>
<h4 id="leaflet">Leaflet 学习资料整理<a class="headerlink" href="#leaflet" title="Permanent link"></a></h4>
<ul>
<li><a href="https://github.com/liuvigongzuoshi/summarize-web-resources/blob/master/leaflet/leaflet-develop-guide.md">Leaflet-Develop-Guide 🍃</a> -开发文档及常用插件小结</li>
</ul>
<h3 id="_4">参考<a class="headerlink" href="#_4" title="Permanent link"></a></h3>
<ul>
<li><a href="http://blog.csdn.net/liyuanxiang1984/article/details/54601985">GIS 制图乐园 esri-leaflet 入门教程（1）-leaflet 介绍</a></li>
<li><a href="https://www.jianshu.com/p/3b3efa92dd6d">Awesome GIS（GIS Tech Stack 技术栈）</a></li>
<li><a href="http://malagis.com/learning-leaflet-js-note.html">麻辣 GIS Leaflet 学习笔记</a></li>
</ul>
<blockquote>
<p>持续更新中 原文地址： <a href="https://juejin.im/post/5a658614f265da3e3f4cce0e">https://juejin.im/post/5a658614f265da3e3f4cce0e</a></p>
</blockquote></article></body></html>

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