C#2008+ArcGIS Mobile实现路口定位

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更多发布于：2010-02-08 15:27

第一步：在道路图层中，通过模糊查询获取道路列表，并选取所需的道路，C#代码如下： 代码 1 /// <summary> 2 /// 模糊查询道路 3 /// </summary> 4 /// <param name="_name">道路名关键字</param> 5 /// <param name="_ms">待操作的mobileservice</param> 6 /// <param name="_layername">操作的图层名</param> 7 /// <param name="_lb">填充结果的ListBox</param> 8 /// <param name="_lg">获取的geometry集合</param> 9 public static void SearchRoadList(string _name, MobileService _ms, string _layername, ListBox _lb,out List<Geometry> _lg) 10 { 11 _lb.Items.Clear(); 12 if (String.IsNullOrEmpty(_name)) 13 { 14 _lg = null; 15 return; 16 } 17 18 MobileServiceLayer msl = _ms.Layers[_layername] as MobileServiceLayer; 19 FeatureLayer fl = msl as ESRI.ArcGIS.Mobile.MobileServices.FeatureLayer; 20 string qstr = "NAME Like '%" + _name + "%'";//过滤内容 21 22 QueryFilter qf = new QueryFilter(qstr, true);//过滤器 23 24 using (FeatureDataReader fdr = fl.GetDataReader(qf)) 25 { 26 _lg = new List<Geometry>(); 27 while (fdr.Read()) 28 { 29 Geometry geo = fdr.GetGeometry() as ESRI.ArcGIS.Mobile.Geometries.Geometry; 30 _lg.Add(geo); 31 string id = Convert.ToString(fdr["OBJECTID"]); 32 string name = Convert.ToString(fdr["NAME"]); 33 _lb.Items.Add(id + "-" + name); 34 } 35 } 36 if (_lb.Items.Count == 0) 37 { 38 MessageBox.Show("搜寻结果为空!", "提示"); 39 } 40 41 42 } 这里除了获取名称以外，也获取了道路的ID，这是因为在实际的数据中可能会有多条道路Polyline的Name相同，但ID不同，下面主要是通过 ID定位道路 在ListBox有查询结果，选择道路后，可以从上面的List<Geometry> _lg中获取对应的Geometry，下面另外附了一段代码，是通过ID获取道路的Geometry的： 代码 1 /// <summary> 2 /// 根据ID获取道路的Geometry 3 /// </summary> 4 /// <param name="_roadid">道路ID</param> 5 /// <param name="_layername">道路操作图层</param> 6 /// <param name="_ms">要操作的MobileService</param> 7 /// <returns></returns> 8 public static ESRI.ArcGIS.Mobile.Geometries.Geometry GetGeometry(string _roadid, string _layername, MobileService _ms) 9 { 10 MobileServiceLayer msl = _ms.Layers[_layername] as MobileServiceLayer; 11 FeatureLayer fl = msl as FeatureLayer; 12 string qstr = "OBJECTID=" + _roadid; 13 QueryFilter qf = new QueryFilter(qstr, true); 14 ESRI.ArcGIS.Mobile.Geometries.Geometry G = null; 15 try 16 { 17 using (FeatureDataReader fdr = fl.GetDataReader(qf)) 18 { 19 while (fdr.Read()) 20 { 21 G = fdr.GetGeometry() as ESRI.ArcGIS.Mobile.Geometries.Geometry; 22 return G; 23 } 24 } 25 return G = null; 26 } 27 catch (Exception ex) 28 { 29 MessageBox.Show(ex.Message, "错误"); 30 return G = null; 31 } 32 } 第二步，分析处理两个道路的Geometry，得到路口，并在图中高亮显示出来，C#代码如下，我的表述能力不怎么好，希望通过代码来弥补 代码 1 /// <summary> 2 /// 高亮显示路口 3 /// </summary> 4 /// <param name="mainroadid">主路的道路ID</param> 5 /// <param name="crossroadid">跨越道路ID</param> 6 /// <param name="layername">操作的图层名</param> 7 /// <param name="ms">操作的MobileService</param> 8 /// <param name="mp">操作的MobileMap</param> 9 /// <param name="cc">搜集到的CoordinateCollection</param> 10 /// <param name="IsMacth">是否超过一个路口</param> 11 public static void HightLightRoadCorner(Geometry mainGeo,Geometry crossGeo, string layername, MobileService ms, ESRI.ArcGIS.Mobile.Map mp, out CoordinateCollection cc, bool IsTouch) 12 { 13 try 14 { 15 //Geometry mainGeo = GetGeometry(mainroadid, layername, ms); 16 if (mainGeo == null) 17 { 18 MessageBox.Show("不能获取对应道路,请检查", "提示"); 19 cc = null; 20 return; 21 } 22 23 //Geometry crossGeo = GetGeometry(crossroadid, layername, ms); 24 if (crossGeo == null) 25 { 26 MessageBox.Show("不能获取第二条道路, 请检查", "提示"); 27 cc = null; 28 return; 29 } 30 GeometricRelationshipType _type; 31 if (IsTouch == true) 32 _type = GeometricRelationshipType.Touch;//两条道路有两个或以上的路口 33 else 34 _type = GeometricRelationshipType.Cross;//两条道路有一个路口 35 36 bool IsCross = mainGeo.Relate(crossGeo, _type);//判断两者是否相交 37 38 if (IsCross == true) 39 { 40 IList<CoordinateCollection> crossRoadParts = crossGeo.Parts; 41 IList<Coordinate> crossRoadCoordinate = crossRoadParts[0]; 42 CoordinateCollection tmpCollect = new CoordinateCollection(); 43 44 if (crossRoadCoordinate.Count != 0) 45 { 46 for (int i = 0; i < crossRoadCoordinate.Count; i++) 47 { 48 ESRI.ArcGIS.Mobile.Geometries.Point tmppoint = new ESRI.ArcGIS.Mobile.Geometries.Point(crossRoadCoordinate); 49 50 if (tmppoint.Within(mainGeo)) 51 { 52 if (IsTouch == true)//有两个或以上交叉路口 53 { 54 Coordinate c = tmppoint.GetExtent().GetCenter(); 55 tmpCollect.Add(c); 56 HighLightOnlyRoadCorner(tmppoint, mp, ms, layername); 57 } 58 else 59 { 60 cc=tmpCollect = null; 61 HighLightOnlyRoadCorner(tmppoint, mp, ms, layername); 62 return; 63 } 64 65 } 66 67 } 68 } 69 //if (tmpCollect.Count == 0) 70 // cc = null; 71 //else 72 // cc = tmpCollect; 73 cc = tmpCollect; 74 75 } 76 else 77 { 78 MessageBox.Show("两条道路不能相交,不能确定路口!", "提示"); 79 cc = null; 80 return; 81 } 82 } 83 catch 84 { 85 cc = null; 86 } 87 88 } 下面是写的两个相关的函数 代码 1 /// <summary> 2 /// 判断点是否在指定区域内 3 /// </summary> 4 /// <param name="_g">geometry</param> 5 /// <param name="_ev">指定区域</param> 6 /// <returns></returns> 7 public static bool PointInEnvelop(Geometry _g, Envelope _ev) 8 { 9 Coordinate cd = _g.GetExtent().GetCenter(); 10 double evcenterx = _ev.XCenter; 11 double evcentery = _ev.YCenter; 12 double minx = evcenterx - _ev.Width / 2; 13 double maxx = evcenterx + _ev.Width / 2; 14 double miny = evcentery - _ev.Height / 2; 15 double maxy = evcentery + _ev.Height / 2; 16 17 if (cd.X > minx ;; cd.X < maxx ;; cd.Y > miny ;; cd.Y < maxy) 18 { 19 return true; 20 } 21 else 22 { 23 return false; 24 } 25 } 26 27 /// <summary> 28 /// 定位路口单点 29 /// </summary> 30 /// <param name="cornerpoint">路口点</param> 31 /// <param name="mp">地图控件</param> 32 /// <param name="layername">图层名</param> 33 public static void HighLightOnlyRoadCorner(ESRI.ArcGIS.Mobile.Geometries.Point cornerpoint, ESRI.ArcGIS.Mobile.Map mp,MobileService ms,string layername) 34 { 35 Envelope newEnvelope = mp.GetExtent(); 36 MobileServiceLayer msl = ms.Layers[layername] as MobileServiceLayer; 37 FeatureLayer fl = msl as ESRI.ArcGIS.Mobile.MobileServices.FeatureLayer; 38 if (fl.InScaleRange(mp.Scale)) 39 { 40 if (PointInEnvelop(cornerpoint as Geometry,newEnvelope)) 41 { 42 mp.FlashGeometry(new Pen(Color.Blue, 2.0F), new SolidBrush(Color.Red), 15, 500, 15, cornerpoint); 43 } 44 else 45 { 46 Coordinate tmpcd = cornerpoint.GetExtent().GetCenter(); 47 Envelope tmpel = new Envelope(tmpcd, 250, 250); 48 mp.SetExtent(tmpel); 49 mp.FlashGeometry(new Pen(Color.Blue, 2.0F), new SolidBrush(Color.Red), 20, 500, 20, cornerpoint); 50 } 51 52 } 53 else 54 { 55 Coordinate tmpcd = cornerpoint.GetExtent().GetCenter(); 56 Envelope tmpel = new Envelope(tmpcd, 250, 250); 57 mp.SetExtent(tmpel); 58 mp.FlashGeometry(new Pen(Color.Blue, 2.0F), new SolidBrush(Color.Red), 20, 500, 20, cornerpoint); 59 60 } 61 } 62 }

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C#2008+ArcGIS Mobile实现路口定位

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