Posted on 2008-06-03 08:52
长沙小能 阅读(722)
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ARCGIS SERVER
本文版权归小能所有,转载麻烦标明出处,谢谢! 同时写作过程中也参阅了大量其他网络文档，如果您觉得侵犯版权，请和我联系：chinazhousheng@gmail.com
网络分析之最短路径查询系列:
前几天在群里面有朋友问我最短路径的事，他想实现一个可能分别在地图上取点设置起点与终点的功能，再计算最短路径的功能。由于最近很多事情，所以一直没有做，昨天花了一点时间，做了一下，其实还是一个状态保存的问题，其思路如下：
step1 :点击地图上的起点，获取起点的坐标，将其转换并保存至session 中
step2：获取终点坐标，判断session中是否有值，如果有，则获取起点
step3:计算最短路径（这在前面已经说过，稍微改变一下），显示在地图上
step4:清除session
大体思路就是这样，当然还有其他的思路，希望大家实现后共享，这次的代码很简单，我简单的发一点！
//获取屏幕点，并转换成Map点
ESRI.ArcGIS.ADF.Web.Geometry.Point pnt = new ESRI.ArcGIS.ADF.Web.Geometry.Point();
ESRI.ArcGIS.ADF.Web.UI.WebControls.PointEventArgs ptargs = null;
ptargs = (PointEventArgs)args;
pnt = ESRI.ArcGIS.ADF.Web.Geometry.Point.ToMapPoint(ptargs.ScreenPoint.X, ptargs.ScreenPoint.Y, mapctrl.Extent, (int)mapctrl.Width.Value, (int)mapctrl.Height.Value);
if (System.Web.HttpContext.Current.Session["beg_point"]==null)
{
System.Web.HttpContext.Current.Session["beg_point"] = pnt;
}
else
{
try
{
// Get the NAServer
using (NAServerProxy naServer = NAServerProxy.Create(SERVER_NAME, ROUTE_SERVICE_NAME, null))
{
if (naServer == null)
throw (new System.Exception("Could not find the web service."));
// Get the NAServerSolverParams
string[] naLayers = naServer.GetNALayerNames(esriNAServerLayerType.esriNAServerRouteLayer);
NAServerSolverParams solverParams = naServer.GetSolverParameters(naLayers[0]) as NAServerSolverParams;
// Set the NAServerRouteParams
NAServerRouteParams routeParams = solverParams as NAServerRouteParams;
DateTime time;
routeParams.ReturnMap = false;
routeParams.ReturnRouteGeometries = true;
routeParams.ReturnStops = true;
routeParams.ReturnDirections = false;
// Geocode two addresses and create the stop network locations
NetAnalysis location = new NetAnalysis(mapctrl);
/**/////
PropertySet[] propSets = new PropertySet[2];
propSets[0] = GeocodeAddress(beg_point.X, beg_point.Y);//
propSets[1] = GeocodeAddress(pnt.X, pnt.Y);//
NAServerPropertySets StopsPropSets = new NAServerPropertySets();
StopsPropSets.PropertySets = propSets;
NAServerRouteParams routeParams1 = solverParams as NAServerRouteParams;
routeParams1.Stops = StopsPropSets;
/**//////
// Solve the Route
NAServerSolverResults solverResults;
solverResults = naServer.Solve(solverParams);
// Display results
location.OutputResults(solverResults);
}
}
catch (Exception exception)
{
//pnlDirectionSummary.Visible = false;
//lblDirections.Visible = false;
//lblTotalDistance.Visible = false;
//dataGridDirections.Visible = false;
lblError.Text = "An error has occurred Mesage = " + exception.Message;
}
private PropertySetProperty CreatePropertySetProperty(string key, object value)
{
PropertySetProperty propSetProperty = new PropertySetProperty();
propSetProperty.Key = key;
propSetProperty.Value = value;
return propSetProperty;
}
private PropertySet GeocodeAddress(double streetAddress_x, double streetAddress_y)
{
//寻找地理位置
PointN addr_point = new PointN() ;
addr_point.X = streetAddress_x;
addr_point.Y = streetAddress_y;
//新建propertyset及PropertySetProperty数组
PropertySet propSet = new PropertySet();
PropertySetProperty[] propSetProperty_new = new PropertySetProperty[2];
propSet.PropertyArray = propSetProperty_new;
//设置propSet结构
propSet.PropertyArray[0] = CreatePropertySetProperty("Shape", addr_point) as PropertySetProperty;
propSet.PropertyArray[1] = CreatePropertySetProperty("Name", "44") as PropertySetProperty;
return propSet;
}
当然，可以添加效果，比如点击起点后，在地图上画一个标志！下面是结果图
