mirror of
https://github.com/jiawanlong/Cesium-Examples.git
synced 2025-11-04 09:14:17 +00:00
287 lines
11 KiB
HTML
287 lines
11 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"/>
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<meta name="apple-mobile-web-app-capable" content="yes"/>
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<title>麻点图专题</title>
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<link href='./css/bootstrap.min.css' rel='stylesheet'/>
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<link href='./css/bootstrap-responsive.min.css' rel='stylesheet'/>
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<link href='./css/sm-extend.css' rel='stylesheet'/>
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<link href='./css/sm-doc.css' rel='stylesheet'/>
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</head>
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<body data-spy="scroll" data-target=".subnav" data-offset="50">
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<!--导航条-->
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<div class="navbar navbar-fixed-top" id="navbar"></div>
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<script src="js/navbar.js"></script>
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<script src="./js/GoTop.js" id="js_gotop"></script>
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<div id='container' class='container'>
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<div class='page-header'>
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<h1>麻点图专题</h1>
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<hr/>
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<h2>一、引言</h2>
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<p>
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目前在客户端绘制POI（Point of Interest，兴趣点）的方式主要是div（Marker的形式）、svg、canvas、VML（后边三种就是Vector Layer）几种方式，这几种方式中只有canvas的效率是最高的，但是canvas只有一些最新的浏览器才支持。虽然div、svg、VML跨浏览器要好一些，但是这几种的效率不够高，最多只能绘制几千个POI。
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</p>
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<p>
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为了展现出大数据量的POI，我们也可以考虑将POI数据集通过iServer发布为临时图层，然后在客户端使用动态图层展现出来，这样解决了数据量大和跨浏览器的问题，但是这些POI没法响应鼠标事件。
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</p>
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<p>
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于是麻点图应运而生。
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</p>
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<h2>二、简介</h2>
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<p>
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SuperMap iClient for JavaScript 提供了麻点图功能，这是一种很高效的web端大数据量渲染解决方案。该功能支持大数据量、跨浏览器、事件响应，并且效率高。
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在大部分主流浏览器下都能快速渲染，且轻松漫游地图。
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</p>
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<div class="pageImage"><img src="./images/goisTopic2.png"/></div>
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<br>
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<p>
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该功能实际上是先调用SuperMap.REST.GetLayersInfoService获取到服务端图层信息，然后修改图层信息，使用SuperMap.REST.SetLayersInfoService设置图层信息创建临时图层，再使用SuperMap.Layer.TiledDynamicRESTLayer将该临时图层在客户端渲染出来。到这一步，大数据量的点就通过瓦片图片的方式在客户端渲染出来了。
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</p>
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<p>
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然后我们再创建SuperMap.Layer.UTFGrid对象，来让这些POI有鼠标事件响应。然后在最上层叠加一个SuperMap.Layer.Markers，当鼠标移动到某个POI上时，就会在相应位置添加一个Marker，高亮该点。
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</p>
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<h2>三、性能</h2>
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<div class="pageImage"><img src="./images/goisTopic3.png"/></div>
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<br>
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<p>
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以上报告为服务端存在临时图层缓存的情况下，渲染POI点所用的时间，当初次使用麻点图功能时渲染会比较慢（大数据量下服务端动态切图是一个比较耗时的操作），初次使用之后（服务端已经存在缓存）渲染POI就要快很多了。
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</p>
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<h2>四、使用说明</h2>
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<br>
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<p>下面我们来详细介绍一下如何使用麻点图。</p>
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<br>
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<h4>
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首先创建一个麻点图对象。
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</h4>
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<p>
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<pre>
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var url = "http://localhost:8090/iserver/services/map-china400/rest/maps/China";
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var myGOIs = new SuperMap.GOIs({
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"url":url,
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"datasetName":"China_Town_P@China400",
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"style":new SuperMap.REST.ServerStyle({
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"markerSymbolID":907941,
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"markerSize":8
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}),
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"pixcell": 16
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});
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</pre>
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</p>
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<p>
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以上代码片段中创建麻点图需要传入一些参数:url为所使用的地图服务的url（通常和TiledDynamicRESTLayer使用的url相同），datasetName为数据对应的子图层名称，
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style为要素的样式风格，这里需要传入SuperMap.REST.ServerStyle类型的对象。
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</p>
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<br>
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<h4>
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然后给麻点图对象绑定 initialized 事件，麻点图初始化完成后会触发该事件。
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</h4>
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<pre>
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myGOIs.events.on({
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"initialized":GOIsInitialized
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});
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function GOIsInitialized(){
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//获取麻点图内部创建的图层对象，并添加到map上
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var layers = myGOIs.getLayers();
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map.addLayers(layers);
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//创建麻点图事件控件，该控件用于实现麻点图的事件响应。
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control = new SuperMap.Control.GOIs(layers,{
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onClick:function(evt){ //定义click事件
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//code
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},
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highlightIcon:new SuperMap.Icon('images/circle.png', new SuperMap.Size(16,16), new SuperMap.Pixel(-8, -8)),//高亮状态下的点样式
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isHighlight:true
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});
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map.addControl(control); //将控件添加到map上
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}
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</pre>
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<br>
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<div>
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<h5>这里给麻点图绑定初始化完成事件，初始化完成后需要完成如下步骤：</h5>
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<ul style="list-style-type:disc;margin-left:68px;">
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<li>获取麻点图内部创建的图层对象，并添加到map上，这里你会得到三个图层对象，
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它们分别是：临时图层（TiledDynamicRESTLayer）、utfgrid图层、marker图层（用于实现高亮效果）。</li>
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<li>创建麻点图事件控件，该控件用于实现麻点图的事件响应，将该控件添加到map上。</li>
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</ul>
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<br>
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<h5>用户需要自己制作一张要素高亮风格的图片，并将该图片设置到控件的highlightIcon属性中</h5>
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<pre>
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highlightIcon:new SuperMap.Icon('images/circle.png', new SuperMap.Size(16,16), new SuperMap.Pixel(-8, -8)),//高亮状态下的点样式
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</pre>
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<br>
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<h5>用户可以通过SuperMap.Control.GOIs给麻点图添加鼠标事件</h5>
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<p>可以通过初始化该控件时，以传参数的方式定义事件。</p>
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<pre>
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var control = new SuperMap.Control.GOIs(layers,{
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onClick:function(evt){ //定义click事件
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//code
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}
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});
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</pre>
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<p>也可以通过事件绑定的方式，给麻点图定义事件。</p>
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<pre>
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control.events.on("mouseover",function(){
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//code
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});
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</pre>
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<p>麻点图提供了丰富的鼠标事件类型：</p>
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<ul style="list-style-type:disc;margin-left:68px;">
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<li>onMouseover</li>
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<li>onMouseout</li>
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<li>onMousemove</li>
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<li>onMousedown</li>
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<li>onMouseup</li>
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<li>onClick</li>
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<li>onDblclick</li>
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</ul>
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</div>
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<h4>
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以下是完整的范例代码：
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</h4>
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<pre>
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<!DOCTYPE>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>麻点图</title>
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<style type="text/css">
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body{
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margin: 0;
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overflow: hidden;
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background: #fff;
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}
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#map{
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position: relative;
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height: 520px;
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border:1px solid #3473b7;
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}
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#toolbar {
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position: relative;
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padding-top: 5px;
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padding-bottom: 10px;
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}
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</style>
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<script src='../libs/SuperMap.Include.js'></script>
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<script type="text/javascript">
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var map,datasetName,popup,myGOIs,control,
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host = document.location.toString().match(/file:\/\//)?"http://localhost:8090":'http://' + document.location.host,
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url=host+"/iserver/services/map-china400/rest/maps/China";
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function init(){
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map = new SuperMap.Map("map",{controls: [
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new SuperMap.Control.LayerSwitcher(),
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new SuperMap.Control.ScaleLine(),
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new SuperMap.Control.Zoom(),
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new SuperMap.Control.Navigation({
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dragPanOptions: {
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enableKinetic: true
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}
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})],allOverlays: true,projection: "EPSG:3857"
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});
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layer = new SuperMap.Layer.TiledDynamicRESTLayer("china", url, {transparent: true, cacheEnabled: true}, {maxResolution:"auto"});
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layer.events.on({"layerInitialized":addLayer});
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}
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function addLayer() {
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map.addLayers([layer]);
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map.setCenter(new SuperMap.LonLat(11782422.179601, 4717749.8315665), 3);
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}
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function createLayer(){
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datasetName = "China_Town_P@China400";
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//创建一个麻点图对象
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myGOIs = new SuperMap.GOIs({
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"url":url,
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"datasetName":datasetName,
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"style":new SuperMap.REST.ServerStyle({
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"markerSymbolID":907942,
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"markerSize":4
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}),
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"pixcell": 16
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});
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myGOIs.events.on({
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"initialized":GOIsInitialized
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});
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}
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function clearLayer(){
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closeInfoWin();
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var layers = myGOIs.getLayers();
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for(var i=0;i<layers.length;i++){
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map.removeLayer(layers[i]);
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}
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myGOIs.destroy();
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myGOIs = null;
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control.destroy();
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control = null;
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}
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function GOIsInitialized(){
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var layers = myGOIs.getLayers();
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map.addLayers(layers);
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control = new SuperMap.Control.GOIs(layers,{
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onClick:function(evt){
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var lonlat = evt.loc;
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var name = evt.data.NAME;
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openInfoWin(lonlat,name);
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},
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highlightIcon:new SuperMap.Icon('images/circle.png', new SuperMap.Size(16,16), new SuperMap.Pixel(-8, -8)),
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isHighlight:true
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});
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map.addControl(control);
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}
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function openInfoWin(lonlat,name){
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closeInfoWin();
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var contentHTML = "<div style=\'font-size:.8em; opacity: 0.8; overflow-y:hidden;\'>";
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contentHTML += "<div>"+name+"</div></div>";
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popup = new SuperMap.Popup.FramedCloud("popwin",new SuperMap.LonLat(lonlat.lon,lonlat.lat),null,contentHTML,null,true,function(){
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closeInfoWin();
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control.removeClickedMarker();
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});
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map.addPopup(popup);
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}
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function closeInfoWin() {
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if (popup) {
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try {
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map.removePopup(popup);
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}
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catch (e) {
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}
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}
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}
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</script>
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</head>
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<body onload="init()">
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<div id="toolbar">
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<input type="button" value="渲染麻点图" onclick="createLayer()" />
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<input type="button" value="清除" onclick="clearLayer()" />
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</div>
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<div id="map"></div>
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</body>
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</html>
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</pre>
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<div class="pageImage"><img src="./images/goisTopic1.png"/></div>
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<br />
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<p>
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这样我们就可以使用麻点图功能了，完整范例请见 示范程序->可视化->可视化图层->麻点图。
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</p>
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</div>
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<div class='footer'>
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<p>版权所有 © 2000-2016 JWL</p>
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</div>
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</div>
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<script src='./js/jquery.js'></script>
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<script src='./js/bootstrap.js'></script>
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</body>
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</html>
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