ArcGIS网络分析之Silverlight客户端最近设施点分析(四)

RouteTask closestFacilityTask = new RouteTask("http://qzj-pc/ArcGIS/rest/services/NetworkAnaysisMap/NAServer/ClosestFacility");//最近设施点Task
       

closestFacilityTask.SolveClosestFacilityCompleted += new EventHandler<RouteEventArgs>(closestFacilityTask_SolveClosestFacilityCompleted);
closestFacilityTask.Failed += new EventHandler<TaskFailedEventArgs>(Task_Failed);

private void closestFacilityTask_SolveClosestFacilityCompleted(object sender, RouteEventArgs e)
        {
        //获取结果的代码
        }
private void Task_Failed(object sender, TaskFailedEventArgs e)
        {
            MessageBox.Show("求解失败" + e.Error.ToString());
        }

 RouteClosestFacilityParameters closestFacilityParameter = new RouteClosestFacilityParameters()
            {
                //设置事件点
                Incidents = stopsGraphicsLayer.Graphics,
                //设置设置点
                Facilities = gplayer.Graphics,
                //设置障碍点
                Barriers = barriesGraphicsLayer.Graphics,
                ReturnDirections = true,
                DirectionsLanguage = new System.Globalization.CultureInfo("en-US"),
                ReturnRoutes = true,
                ReturnFacilities = true,
                ReturnBarriers = false,
                ReturnIncidents = true,
                ReturnPolygonBarriers = false,
                ReturnPolylineBarriers = false,
                DefaultCutoff = 100000,
                FacilityReturnType = FacilityReturnType.ServerFacilityReturnAll,
                DefaultTargetFacilityCount = Convert.ToInt32(ClosestFaciclityNumTextBox.Text),
                TravelDirection = FacilityTravelDirection.TravelDirectionToFacility,
                OutSpatialReference = MyMap.SpatialReference,
            };

 if (closestFacilityTask.IsBusy)
                closestFacilityTask.CancelAsync();
            closestFacilityTask.SolveClosestFacilityAsync(closestFacilityParameter);

  private void closestFacilityTask_SolveClosestFacilityCompleted(object sender, RouteEventArgs e)
        {
            //清空显示方向的面板
            DirectionStackPanel.Children.Clear();
            //情况路线图层(即上一次查询的结果)
            RoutegraphicsLayer.Graphics.Clear();
            //定义一个TreeView控件，将用于显示路径
            TreeView RouteTree = new TreeView();
            //注册TreeView事件，当选择不同的节点时，高亮显示相应的路径
            RouteTree.SelectedItemChanged += new RoutedPropertyChangedEventHandler<object>(RouteTree_SelectedItemChanged);
            //遍历返回的结果(路线)
            foreach (RouteResult SolvedRoute in e.RouteResults)
            {
                RouteResult routeResult = SolvedRoute;
                //定义路线样式
                routeResult.Route.Symbol = LayoutRoot.Resources["MyRouteLineSymbol"] as SimpleLineSymbol;
                //将路线添加到图层中
                RoutegraphicsLayer.Graphics.Add(routeResult.Route);
                //添加一个Item，即表示当前的路线。将路线以树视图的形式展示出来
                TreeViewItem RouteItem = new TreeViewItem();

                //树视图一级标题格式：<路线ID>.<路线名称>
                RouteItem.Header = string.Format("{0}: {1}", SolvedRoute.Directions.RouteID, SolvedRoute.Directions.RouteName);
                //将TreeViewItem的Tag设置为相应路线的ID,以便之后高亮显示其对应路线。
                RouteItem.Tag = SolvedRoute.Directions.RouteID;

                int i = 1;
                foreach (Graphic g in routeResult.Directions)
                {
                    StringBuilder direction = new StringBuilder();
                    direction.AppendFormat("{0}. {1}", i, g.Attributes["text"]);
                    if (i > 1 && i < routeResult.Directions.Features.Count)
                    {
                        decimal Distance = (decimal)g.Attributes["length"];
                        direction.AppendFormat("  {0}米", Distance.ToString("#0.000"));
                        decimal NeedTime = (decimal)g.Attributes["time"];
                        direction.AppendFormat(", {0}分钟", NeedTime.ToString("#0.00"));
                    }
                    RouteItem.Items.Add(new TextBlock()
                    {
                        Text = direction.ToString(),
                        Margin = new Thickness(4)
                    });
                    i++;
                }
                //添加总时间和路程的属性
                RouteItem.Items.Add(new TextBlock()
                {
                    Text = string.Format(" 总路程为：{0}千米\n\n 总时间为：{1}分钟", (SolvedRoute.Directions.TotalLength).ToString("#0.000"), 
                     SolvedRoute.Directions.TotalDriveTime.ToString("#0.00"))
                });
                //遍历一条路线结束，将该路线的信息添加到TreeView中，TreeView获得一个节点。
                RouteTree.Items.Add(RouteItem);
            }
            //遍历路线结束，将路线结果添加到显示方向的面板中。
            DirectionStackPanel.Children.Add(RouteTree);
        }

  //记录上一次点击的是哪一个节点
       int OldIndex = 0;
       private void RouteTree_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
        {
           //必须点击节点才有效，节点下的TextBlock虽然也能触发Changed事件，但是无效
            if (e.NewValue.ToString() == typeof(TextBlock).ToString())
            {
                return;
            }
            //如果旧值不为空，即不是第一次点击，那么上一次点击就有可能是节点还有可能是节点下的TextBlock。
            //因为当点击不同的节点时，我们需要将上一次高亮显示的路线不高亮，而高亮显示本次选中的路线
            //所以在此需要处理
            if (e.OldValue != null)
            {
                //如果上一次点击的是TreeViewItem则直接将其还原成不高亮显示
                if (e.OldValue.ToString() == typeof(TreeViewItem).ToString())
                {   
                    TreeViewItem treeViewItem = (TreeViewItem)e.OldValue;
                    OldIndex = Convert.ToInt32(treeViewItem.Tag);
                    //在Tag中1表示的是第一条路线，其对应Graphics的索引值为0,一次类推减1.
                    RoutegraphicsLayer.Graphics[OldIndex - 1].Symbol = LayoutRoot.Resources["MyRouteLineSymbol"] as SimpleLineSymbol;
                }//如果上一次点击的不是TreeView,则需要通过记录上一次点击的索引：Oldindex来确定上一次点击的是那一个TreeView,并将其还原成不高亮
                else
                {
                    RoutegraphicsLayer.Graphics[OldIndex].Symbol = LayoutRoot.Resources["MyRouteLineSymbol"] as SimpleLineSymbol;
                }
            }
            //获得当前点击节点的索引
            int currentIndex = Convert.ToInt32(((TreeViewItem)((TreeView)sender).SelectedItem).Tag);
           //高亮显示当前选择的路线
            RoutegraphicsLayer.Graphics[currentIndex - 1].Symbol = LayoutRoot.Resources["RouteRenderer"] as SimpleLineSymbol;
           //将本次点击的所以赋给OldIndex.
            OldIndex = currentIndex - 1;
        }