ArcGIS Server JavaScript实现实现buffer分析
ArcGIS Server JavaScript实现实现buffer分析
核心提示：ArcGIS Server JavaScript实现实现buffer分析
目的：
1.ArcGIS.Server.9.3和ArcGIS API for JavaScript实现实现点、线、面的buffer分析，这里是通过GeometryServer实现。
准备工作：
1. 在ArcGis Server9.3中发布名为usa的MapServer。
2. 在ArcGis Server9.3中发布名为Geometry的GeometryServer。
完成后的效果图：
开始
0.关于GeometryServer的介绍，可以看本系列的第九篇。
1.启动vs新建名为BufferSample的ASP.NET Web应用程序。其实jsapi是纯客户端的开发了不需要vs也不需要.net了，纯html页面就可以了用记事本都可以开发了。我这里为了方便了就用vs2008了，毕竟可以调试js脚本了。
2.接着在工程中添加名为javascript的文件夹并且在这个文件夹里新建wabapp.js的文件，这里用来编写我们自己的js代码了，在Default.aspx页面里添加对这个js文件的引用，同时在Default.aspx页面里添加一个id为map的div标签作为地图控件的载体、5个input的功能按钮、2个input的输入框、1个select选择列表：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="BufferSample._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/1.2/js/dojo/dijit/themes/tundra/tundra.css">
<script src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.2" type="text/javascript"></script>
<script src="javascript/webapp.js"></script>
<style type="text/css">
#Text1
{
width: 54px;
}
</style>
</head>
<body class="tundra">
<form id="form1" runat="server">
<table>
<tr><td><div>
<input id="Button1" type="button" value=" 点 " onclick="tb.activate(esri.toolbars.Draw.POINT);map.hideZoomSlider();" />
<input id="Button2" type="button" value=" 线 " onclick="tb.activate(esri.toolbars.Draw.LINE);map.hideZoomSlider();" />
<input id="Button3" type="button" value=" 面 " onclick="tb.activate(esri.toolbars.Draw.POLYGON);map.hideZoomSlider();" />
<input id="Button4" type="button" value="漫 游" onclick="tb.deactivate();map.showZoomSlider();" />
WKID:<input id="wkid" style="width:40px" type="text" value="102113" />Buffer距离:<input id="distance" style="width:40px" type="text" value="25" />
<select id="unit" name="unit">
<option value="UNIT_STATUTE_MILE">英里</option>
<option value="UNIT_FOOT">码</option>
<option value="UNIT_KILOMETER">千米</option>
<option value="UNIT_METER">米</option>
<option value="UNIT_NAUTICAL_MILE">海里</option>
<option value="UNIT_US_NAUTICAL_MILE">美式海里</option>
<option value="UNIT_DEGREE">度</option>
</select>
<input id="Button5" type="button" value="清 除" onclick="map.graphics.clear();" />
</div></td><td></td></tr>
<tr><td><div id="map" style="width:550px; height:400px; border:1px solid #000;"></div></td><td valign="top" align="left">dd</td></tr>
</table>
</form>
</body>
</html>
3、上面的html代码中主要可以看一下5个input按钮的onclick事件，分别实现了画点、画线、画面、漫游、清楚图形的代码很简单了，还有就是单位选择的select了已经添加了7个常用的单位。<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/1.2/js/dojo/dijit/themes/tundra/tundra.css">
<script src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.2" type="text/javascript"></script>
<script src="javascript/webapp.js"></script>
<style type="text/css">
#Text1
{
width: 54px;
}
</style>
</head>
<body class="tundra">
<form id="form1" runat="server">
<table>
<tr><td><div>
<input id="Button1" type="button" value=" 点 " onclick="tb.activate(esri.toolbars.Draw.POINT);map.hideZoomSlider();" />
<input id="Button2" type="button" value=" 线 " onclick="tb.activate(esri.toolbars.Draw.LINE);map.hideZoomSlider();" />
<input id="Button3" type="button" value=" 面 " onclick="tb.activate(esri.toolbars.Draw.POLYGON);map.hideZoomSlider();" />
<input id="Button4" type="button" value="漫 游" onclick="tb.deactivate();map.showZoomSlider();" />
WKID:<input id="wkid" style="width:40px" type="text" value="102113" />Buffer距离:<input id="distance" style="width:40px" type="text" value="25" />
<select id="unit" name="unit">
<option value="UNIT_STATUTE_MILE">英里</option>
<option value="UNIT_FOOT">码</option>
<option value="UNIT_KILOMETER">千米</option>
<option value="UNIT_METER">米</option>
<option value="UNIT_NAUTICAL_MILE">海里</option>
<option value="UNIT_US_NAUTICAL_MILE">美式海里</option>
<option value="UNIT_DEGREE">度</option>
</select>
<input id="Button5" type="button" value="清 除" onclick="map.graphics.clear();" />
</div></td><td></td></tr>
<tr><td><div id="map" style="width:550px; height:400px; border:1px solid #000;"></div></td><td valign="top" align="left">dd</td></tr>
</table>
</form>
</body>
</html>
4、切换到wabapp.js编写js代码，本例子的js代码分为3部分功能，第一载入地图进行显示；第二进行画点、线、面操作；第三根据画的点、线、面图形进行buffer分析。具体的说明看代码注释：
dojo.require(
"
esri.map
"
);
dojo.require( " esri.tasks.geometry " );
dojo.require( " esri.toolbars.draw " );
dojo.require( " esri.tasks.query " );
djConfig = { isDebug: true };
var map,tb,geometryService,queryTask,query;
function init()
{
startExtent = new esri.geometry.Extent( - 183.780014745329 , 16.2975638854873 , - 61.4068547410964 , 74.0304580085983 , new esri.SpatialReference({wkid: 4269 }));
map = new esri.Map( " map " );
// 底图Tile图
var imageryPrime = new esri.layers.ArcGISTiledMapServiceLayer( " http://server.arcgisonline.com/ArcGIS/rest/services/NGS_Topo_US_2D/MapServer " );
map.addLayer(imageryPrime);
var usa = new esri.layers.ArcGISDynamicMapServiceLayer( " http://jh-53a435fbc0e8/ArcGIS/rest/services/USA/MapServer " );
// 设置要显示的图层
// usa.setVisibleLayers([0]);
// 设置图层透明度
usa.setOpacity( 0.8 );
map.addLayer(usa);
// 设置地图视图范围
map.setExtent(startExtent);
geometryService = new esri.tasks.GeometryService( " http://jh-53a435fbc0e8/ArcGIS/rest/services/Geometry/GeometryServer " );
tb = new esri.toolbars.Draw(map);
dojo.connect(tb, " onDrawEnd " , doDraw);
}
// 画图
function doDraw(geometry)
{
// 根据图形的类型定义显示样式
switch (geometry.type)
{
case " point " :
var symbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_SQUARE, 10 , new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([ 255 , 0 , 0 ]), 1 ), new dojo.Color([ 0 , 255 , 0 , 0.25 ]));
break ;
case " polyline " :
var symbol = new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASH, new dojo.Color([ 255 , 0 , 0 ]), 1 );
break ;
case " polygon " :
var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([ 0 , 0 , 0 ]), 1 ), new dojo.Color([ 255 , 0 , 0 , 0.25 ]));
break ;
}
// 把绘制的图形添加到map.graphics进行显示
var graphic = new esri.Graphic(geometry, symbol);
map.graphics.add(graphic);
// 如果是面需要先进行simplify操作，否则直接进行buffer
if (geometry.type === " polygon " )
{
geometryService.simplify([graphic],doSimplify);
}
else
{
doBuffer([graphic]);
}
}
// simplify结束调用buffer
function doSimplify(graphics)
{
doBuffer(graphics);
}
function doBuffer(graphics)
{
// buffer参数
var params = new esri.tasks.BufferParameters();
// buffer的范围值，从输入框中获取
params.distances = [ dojo.byId( " distance " ).value ];
// 空间参考
params.bufferSpatialReference = new esri.SpatialReference({wkid: dojo.byId( " wkid " ).value});
// 输出结果的空间参考
params.outSpatialReference = map.spatialReference;
params.features = graphics;
// buffer的单位，从列表框获取
params.unit = eval( " esri.tasks.BufferParameters. " + dojo.byId( " unit " ).value);
// buffer操作
geometryService.buffer(params,showBuffer);
}
// 显示buffer的结果
function showBuffer(features)
{
var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([ 255 , 0 , 0 , 0.65 ]), 2 ), new dojo.Color([ 255 , 0 , 0 , 0.35 ]));
for ( var j = 0 ;j < features.length;j ++ )
{
var graphic = new esri.Graphic(features[j].geometry,symbol);
map.graphics.add(graphic);
}
tb.deactivate();
map.showZoomSlider();
}
dojo.addOnLoad(init);
5、这样就完成了buffer的例子。
dojo.require( " esri.tasks.geometry " );
dojo.require( " esri.toolbars.draw " );
dojo.require( " esri.tasks.query " );
djConfig = { isDebug: true };
var map,tb,geometryService,queryTask,query;
function init()
{
startExtent = new esri.geometry.Extent( - 183.780014745329 , 16.2975638854873 , - 61.4068547410964 , 74.0304580085983 , new esri.SpatialReference({wkid: 4269 }));
map = new esri.Map( " map " );
// 底图Tile图
var imageryPrime = new esri.layers.ArcGISTiledMapServiceLayer( " http://server.arcgisonline.com/ArcGIS/rest/services/NGS_Topo_US_2D/MapServer " );
map.addLayer(imageryPrime);
var usa = new esri.layers.ArcGISDynamicMapServiceLayer( " http://jh-53a435fbc0e8/ArcGIS/rest/services/USA/MapServer " );
// 设置要显示的图层
// usa.setVisibleLayers([0]);
// 设置图层透明度
usa.setOpacity( 0.8 );
map.addLayer(usa);
// 设置地图视图范围
map.setExtent(startExtent);
geometryService = new esri.tasks.GeometryService( " http://jh-53a435fbc0e8/ArcGIS/rest/services/Geometry/GeometryServer " );
tb = new esri.toolbars.Draw(map);
dojo.connect(tb, " onDrawEnd " , doDraw);
}
// 画图
function doDraw(geometry)
{
// 根据图形的类型定义显示样式
switch (geometry.type)
{
case " point " :
var symbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_SQUARE, 10 , new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([ 255 , 0 , 0 ]), 1 ), new dojo.Color([ 0 , 255 , 0 , 0.25 ]));
break ;
case " polyline " :
var symbol = new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASH, new dojo.Color([ 255 , 0 , 0 ]), 1 );
break ;
case " polygon " :
var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([ 0 , 0 , 0 ]), 1 ), new dojo.Color([ 255 , 0 , 0 , 0.25 ]));
break ;
}
// 把绘制的图形添加到map.graphics进行显示
var graphic = new esri.Graphic(geometry, symbol);
map.graphics.add(graphic);
// 如果是面需要先进行simplify操作，否则直接进行buffer
if (geometry.type === " polygon " )
{
geometryService.simplify([graphic],doSimplify);
}
else
{
doBuffer([graphic]);
}
}
// simplify结束调用buffer
function doSimplify(graphics)
{
doBuffer(graphics);
}
function doBuffer(graphics)
{
// buffer参数
var params = new esri.tasks.BufferParameters();
// buffer的范围值，从输入框中获取
params.distances = [ dojo.byId( " distance " ).value ];
// 空间参考
params.bufferSpatialReference = new esri.SpatialReference({wkid: dojo.byId( " wkid " ).value});
// 输出结果的空间参考
params.outSpatialReference = map.spatialReference;
params.features = graphics;
// buffer的单位，从列表框获取
params.unit = eval( " esri.tasks.BufferParameters. " + dojo.byId( " unit " ).value);
// buffer操作
geometryService.buffer(params,showBuffer);
}
// 显示buffer的结果
function showBuffer(features)
{
var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([ 255 , 0 , 0 , 0.65 ]), 2 ), new dojo.Color([ 255 , 0 , 0 , 0.35 ]));
for ( var j = 0 ;j < features.length;j ++ )
{
var graphic = new esri.Graphic(features[j].geometry,symbol);
map.graphics.add(graphic);
}
tb.deactivate();
map.showZoomSlider();
}
dojo.addOnLoad(init);