本节讲的是Arcgis for Js的针对graphiclayer的空间查询，内容非常easy。代码例如以下：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
<title>Simple Map</title>
<link rel="stylesheet" href="http://localhost/arcgis_js_api/library/3.9/3.9/js/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
margin: 0;
padding: 0;
}
body {
background-color: #FFF;
overflow: hidden;
font-family: "Trebuchet MS";
}
#map_ctrl{
z-index: 99;
position: absolute;
top: 20pt;
right: 10pt;
background: #fff;
}
.button{
padding: 3px 8px;
background: #eee;
text-align: center;
font-size: 12px;
font-family: "微软雅黑";
}
.button:hover,.attr_ctrl:hover{
background: #ccc;
cursor: pointer;
}
</style>
<script src="http://localhost/arcgis_js_api/library/3.9/3.9/init.js"></script>
<script src="jquery-1.8.3.js"></script>
<script>
var iconPath = "M24.0,2.199C11.9595,2.199,2.199,11.9595,2.199,24.0c0.0,12.0405,9.7605,21.801,21.801,21.801c12.0405,0.0,21.801-9.7605,21.801-21.801C45.801,11.9595,36.0405,2.199,24.0,2.199zM31.0935,11.0625c1.401,0.0,2.532,2.2245,2.532,4.968S32.4915,21.0,31.0935,21.0c-1.398,0.0-2.532-2.2245-2.532-4.968S29.697,11.0625,31.0935,11.0625zM16.656,11.0625c1.398,0.0,2.532,2.2245,2.532,4.968S18.0555,21.0,16.656,21.0s-2.532-2.2245-2.532-4.968S15.258,11.0625,16.656,11.0625zM24.0315,39.0c-4.3095,0.0-8.3445-2.6355-11.8185-7.2165c3.5955,2.346,7.5315,3.654,11.661,3.654c4.3845,0.0,8.5515-1.47,12.3225-4.101C32.649,36.198,28.485,39.0,24.0315,39.0z";
var CITY_DATA={
"total":34,
"items":[{"id":1,"name":"乌鲁木齐","X":87.575829,"Y":43.782212},
{"id":2,"name":"拉萨","X":91.162998,"Y":29.71042},
{"id":3,"name":"西宁","X":101.797303,"Y":36.593642},
{"id":4,"name":"兰州","X":103.584297,"Y":36.119086},
{"id":5,"name":"成都","X":104.035508,"Y":30.714179},
{"id":6,"name":"重庆","X":106.519115,"Y":29.478925},
{"id":7,"name":"贵阳","X":106.668071,"Y":26.457312},
{"id":8,"name":"昆明","X":102.726775,"Y":24.969385},
{"id":9,"name":"银川","X":106.167225,"Y":38.598524},
{"id":10,"name":"西安","X":108.967128,"Y":34.276112},
{"id":11,"name":"南宁","X":108.233931,"Y":22.748296},
{"id":12,"name":"海口","X":110.346181,"Y":19.96992},
{"id":13,"name":"广州","X":113.226683,"Y":23.18307},
{"id":14,"name":"长沙","X":112.947928,"Y":28.169916},
{"id":15,"name":"南昌","X":115.893715,"Y":28.652363},
{"id":16,"name":"福州","X":119.246768,"Y":26.070765},
{"id":17,"name":"台北","X":121.503567,"Y":25.008274},
{"id":18,"name":"杭州","X":120.183046,"Y":30.330584},
{"id":19,"name":"上海","X":121.449707,"Y":31.253361},
{"id":20,"name":"武汉","X":114.216597,"Y":30.579253},
{"id":21,"name":"合肥","X":117.262302,"Y":31.838353},
{"id":22,"name":"南京","X":118.805692,"Y":32.085022},
{"id":23,"name":"郑州","X":113.6511,"Y":34.746308},
{"id":24,"name":"济南","X":117.048331,"Y":36.60841},
{"id":25,"name":"石家","X":114.478215,"Y":38.033276},
{"id":26,"name":"太原","X":112.483066,"Y":37.798404},
{"id":27,"name":"呼和浩特","X":111.842806,"Y":40.895751},
{"id":28,"name":"天津","X":117.351094,"Y":38.925719},
{"id":29,"name":"沈阳","X":123.296299,"Y":41.801604},
{"id":30,"name":"长春","X":125.26142,"Y":43.981984},
{"id":31,"name":"哈尔","X":126.567138,"Y":45.69381},
{"id":32,"name":"北京","X":116.068276,"Y":39.892225},
{"id":33,"name":"香港","X":114.093117,"Y":22.427852},
{"id":34,"name":"澳门","X":113.552482,"Y":22.184495}
]
};
var map, mapCenter;
var drawToolbar, selectedGraphics=new Array();
require([
"esri/map",
"esri/layers/ArcGISTiledMapServiceLayer",
"esri/layers/FeatureLayer",
"esri/layers/GraphicsLayer",
"esri/geometry/Point",
"esri/symbols/PictureMarkerSymbol",
"esri/symbols/SimpleLineSymbol",
"esri/renderers/SimpleRenderer",
"dojo/_base/Color",
"dojo/on",
"dojo/dom",
"dojo/domReady!"],
function(Map,
Tiled,
FeatureLayer,
GraphicsLayer,
Point,
PictureMarkerSymbol,
SimpleLineSymbol,
SimpleRenderer,
Color,
on,
dom)
{
map = new Map("map", {logo:false,slider: true});
var tiled = new Tiled("http://localhost:6080/arcgis/rest/services/chinamap/MapServer");
map.addLayer(tiled,0);
var chartLayer = new GraphicsLayer({"id":"chartLayer"});
map.addLayer(chartLayer,1);
mapCenter = new Point(103.847, 36.0473, map.spatialReference);
map.centerAndZoom(mapCenter,4);
addReadPopup(CITY_DATA);
//加入红气泡
function addReadPopup(data){
var items= data.items;
for(var i=0;i<data.total;i++){
var pt=new Point(items[i].X,items[i].Y,map.spatialReference);
var graphic = new esri.Graphic(pt,createSymbol(iconPath, "#ff0000"),items[i]);
chartLayer.add(graphic);
}
};
function createSymbol(path, color){
var markerSymbol = new esri.symbol.SimpleMarkerSymbol();
markerSymbol.setPath(path);
markerSymbol.setColor(new dojo.Color(color));
markerSymbol.setOutline(null);
return markerSymbol;
};
drawToolbar = new esri.toolbars.Draw(map);
drawToolbar.on("draw-end",showResults);
on(dom.byId("extent"), "click", function(){
map.setMapCursor("pointer");
for(var i= 0, total=selectedGraphics.length;i<total;i++){
selectedGraphics[i].symbol = createSymbol(iconPath,"#f00");
chartLayer.redraw();
}
selectedGraphics=[];
drawToolbar.activate(esri.toolbars.Draw.EXTENT);
});
function showResults(extent){
drawToolbar.deactivate();
map.setMapCursor("default");
var graphics = chartLayer.graphics;
for(var i= 0, total=graphics.length;i<total;i++){
if(extent.geometry.contains(graphics[i].geometry)){
selectedGraphics.push(graphics[i]);
graphics[i].symbol = createSymbol(iconPath,"#0ff");
chartLayer.redraw();
}
}
};
});
</script>
</head>
<body>
<div id="map">
<div id="map_ctrl">
<a id="extent" class="button">矩 形</a>
</div>
</div>
</body>
</html>实现后的效果例如以下：
初始状态
选择框
