概述：
在前文中讲到了在Arcgis for js中统计图的实现，在本文，讲述在Openlayers3中结合highcharts实现统计图。
实现：
在Openlayers3中实现统计图比较方便，通过ol.Overlay即可。首先，了解下Overlay。在OL3的借口文档中，Overlay的描述如下：
An element to be displayed over the map and attached to a single map location。
大概意思就是一个有空间位置的可以在地图上展示的要素。
关键代码：
$("#addchart").on("click",function(){
for(var i=0;i<data.length;i++){
var d = data[i];
var pt = [d.x, d.y];
var domid = "chart"+i;
$("#chart").append("<div id='"+domid+"'></div>");
var chart = new ol.Overlay({
position: pt,
positioning: ol.OverlayPositioning.CENTER_CENTER,
element: document.getElementById(domid)
});
map.addOverlay(chart);
addChart(domid,d,100);
}
}); function addChart(domid,data,size){
$('#'+domid).highcharts({
chart: {
backgroundColor: 'rgba(255, 255, 255, 0)',
plotBorderColor: null,
plotBackgroundColor: null,
plotBackgroundImage: null,
plotBorderWidth: null,
plotShadow: false,
width: size,
height: size
},
tooltip: {
pointFormat: '<b>{point.percentage:.1f}%</b>'
},
credits:{
enabled:false
},
title: {
text: ''
},
plotOptions:{
pie: {
dataLabels: {
enabled: false
}
}
},
series: [{
type: 'pie',
name: data.name,
data: data.data
}]
});
}上述代码运行后的效果如下：上述示例的完整代码如下：
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Ol3 wms</title>
<link rel="stylesheet" type="text/css" href="../../../plugin/ol3/css/ol.css"/>
<style type="text/css">
body, #map {
border: 0px;
margin: 0px;
padding: 0px;
width: 100%;
height: 100%;
font-size: 13px;
}
.tool{
position: absolute;
top:10pt;
right: 10pt;
padding: 5px;
background: #fff;
border: 1px solid #ff5500;
z-index: 100;
}
</style>
<script type="text/javascript" src="../../../plugin/ol3/build/ol-debug.js"></script>
<script type="text/javascript" src="../../../plugin/jquery/jquery-1.8.3.js"></script>
<script src="../../../plugin/highcharts/highcharts.js"></script>
<script type="text/javascript">
var data = [{name:"乌鲁木齐",x:87.5758285931,y:43.7822116460,data:[
{
name: '男',
y: 40.0,
color:"#5ab1ef"
},{
name: '女',
y: 60.0,
color:"#d87a80"
}
]},
{name:"拉萨",x:91.1629975040,y:29.7104204643,data:[
{
name: '男',
y: 45.0,
color:"#5ab1ef"
},{
name: '女',
y: 55.0,
color:"#d87a80"
}
]},
{name:"北京",x:116.4575803581078,y:40.04054437977018,data:[
{
name: '男',
y: 35.0,
color:"#5ab1ef"
},{
name: '女',
y: 65.0,
color:"#d87a80"
}
]},
{name:"兰州",x:103.584297498,y:36.1190864503,data:[
{
name: '男',
y: 44.0,
color:"#5ab1ef"
},{
name: '女',
y: 56.0,
color:"#d87a80"
}
]}];
var map;
function init(){
var format = 'image/png';
var bounds = [73.4510046356223, 18.1632471876417,
134.976797646506, 53.5319431522236];
var tiled = new ol.layer.Tile({
visible: true,
source: new ol.source.TileWMS({
url: 'http://localhost:8088/geoserver/lzugis/wms',
params: {'FORMAT': format,
'VERSION': '1.1.1',
tiled: true,
LAYERS: 'lzugis:province',
STYLES: ''
}
})
});
var projection = new ol.proj.Projection({
code: 'EPSG:4326',
units: 'degrees'
});
map = new ol.Map({
controls: ol.control.defaults({
attribution: false
}),
target: 'map',
layers: [
tiled
],
view: new ol.View({
projection: projection
})
});
map.getView().fitExtent(bounds, map.getSize());
var view =map.getView();
$("#addchart").on("click",function(){
for(var i=0;i<data.length;i++){
var d = data[i];
var pt = [d.x, d.y];
var domid = "chart"+i;
$("#chart").append("<div id='"+domid+"'></div>");
var chart = new ol.Overlay({
position: pt,
positioning: ol.OverlayPositioning.CENTER_CENTER,
element: document.getElementById(domid)
});
map.addOverlay(chart);
addChart(domid,d,100);
}
});
}
function addChart(domid,data,size){
$('#'+domid).highcharts({
chart: {
backgroundColor: 'rgba(255, 255, 255, 0)',
plotBorderColor: null,
plotBackgroundColor: null,
plotBackgroundImage: null,
plotBorderWidth: null,
plotShadow: false,
width: size,
height: size
},
tooltip: {
pointFormat: '<b>{point.percentage:.1f}%</b>'
},
credits:{
enabled:false
},
title: {
text: ''
},
plotOptions:{
pie: {
dataLabels: {
enabled: false
}
}
},
series: [{
type: 'pie',
name: data.name,
data: data.data
}]
});
}
</script>
</head>
<body onLoad="init()">
<div id="map">
<div class="tool">
<button id="addchart">添加统计图</button>
</div>
<div style="display: none;" id="chart">
</div>
</div>
</body>
</html>
