使用C#配合ArcGIS Engine进行地理信息系统开发
简单的地图读取、展示 第一部分就是最简单的helloworld了:掌握使用控件创建简单的GIS应用程序~ 首先打开VS2010,,通过(文件--新建--项目--Windos窗体应用程序) ,我们新建一个名叫“MyHelloWorld”的Windows 窗体应用程序。然后就要开始往里面填控件了: 注意: ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.EngineOrDesktop); 这主要是针对Arcgis10.0的变化而设置的,添加后的代码如下: namespace MyHelloWorld { static class Program { /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.EngineOrDesktop); Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); 接下来,我们就可以通过设置编辑ToolbarControl的属性,来给它添加上我们需要的工具了,同时要记得在ToolBar控件和axTOCCControl1控件的属性设置中,将ToolBar的Buddy选项设置为axTOCCControl1,这样就可以将二者进行联动。 全部设置后之后,第一章的内容就基本结束了,将程序调试后,最终效果如下图,一个最简单的GIS桌面程序就出来啦~~ 打开地图文档、鹰眼图的制作 private void button1_Click(object sender,EventArgs e) { OpenFileDialog OpenMXD = new OpenFileDialog(); OpenMXD.Title = "打开地图"; OpenMXD.InitialDirectory = "E:"; OpenMXD.Filter = "Map Documents (*.mxd)|*.mxd"; if (OpenMXD.ShowDialog() == DialogResult.OK) { string MxdPath = OpenMXD.FileName; axMapControl1.LoadMxFile(MxdPath); <span style="white-space:pre"> </span>} } 我们可以通过相同的方法打开shape文件,但是这里要注意: private void button2_Click(object sender,EventArgs e) { { string[] S = OpenShapeFile(); try { axMapControl1.AddShapeFile(S[0],S[1]); } catch { MessageBox.Show("请至少选择一个shape文件","ERROR"); } } } public string[] OpenShapeFile() { string[] ShpFile = new string[2]; OpenFileDialog OpenShpFile = new OpenFileDialog(); OpenShpFile.Title = "打开Shape文件"; OpenShpFile.InitialDirectory = "E:"; OpenShpFile.Filter = "Shape文件(*.shp)|*.shp"; if (OpenShpFile.ShowDialog() == DialogResult.OK) { string ShapPath = OpenShpFile.FileName; //利用""将文件路径分成两部分 int Position = ShapPath.LastIndexOf(""); string FilePath = ShapPath.Substring(0,Position); string ShpName = ShapPath.Substring(Position + 1); ShpFile[0] = FilePath; ShpFile[1] = ShpName; } return ShpFile; } 运行后结果如下: 这部分完成后,接下来是鹰眼图的制作~: 鹰眼图的操作主要分为两个部分,当在主控件中重新加载一幅图的时候,另外一个控件的图也发生相应的变化, 大致思路是在获得你在打开主地图后,向鹰眼图(MapControl2)中添加相同的图层,并不断更新你在主地图的当前范围,再在鹰眼图的对应区域中绘制一个红框表示对应范围。 我们在form中拖入第二个地图控件axMapControl2,用它作为axMapControl1的鹰眼图进行表示。 private void axMapControl1_OnExtentUpdated(object sender,ESRI.ArcGIS.Controls.IMapControlEvents2_OnExtentUpdatedEvent e) { //设置一个新的外接矩形 IEnvelope pEnvelope = (IEnvelope)e.newEnvelope; IGraphicsContainer pGraphicsContainer = axMapControl2.Map as IGraphicsContainer; IActiveView pActiveView = pGraphicsContainer as IActiveView; //在绘制前,清除axMapControl2中的任何图形元素 pGraphicsContainer.DeleteAllElements(); IRectangleElement pRectangleEle = new RectangleElementClass(); IElement pElement = pRectangleEle as IElement; pElement.Geometry = pEnvelope; //设置鹰眼图中的红线框 IRgbColor pColor = new RgbColorClass(); pColor.Red = 255; pColor.Green = 0; pColor.Blue = 0; pColor.Transparency = 255; //产生一个线符号对象 ILineSymbol pOutline = new SimpleLineSymbolClass(); pOutline.Width = 3; pOutline.Color = pColor; //设置颜色属性 pColor = new RgbColorClass(); pColor.Red = 255; pColor.Green = 0; pColor.Blue = 0; pColor.Transparency = 0; //设置填充符号的属性 IFillSymbol pFillSymbol = new SimpleFillSymbolClass(); pFillSymbol.Color = pColor; pFillSymbol.Outline = pOutline; IFillShapeElement pFillShapeEle = pElement as IFillShapeElement; pFillShapeEle.Symbol = pFillSymbol; pGraphicsContainer.AddElement((IElement)pFillShapeEle,0); pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics,null,null); //将地图范围显示在StripStatus中 IPoint ll,Ur; ll = axMapControl1.Extent.LowerLeft; Ur = axMapControl1.Extent.LowerRight; toolStripStatusLabel3.Text = "(" + Convert.ToString(ll.X) + "," + Convert.ToString(ll.Y) + ")"; } private void axMapControl1_OnMapReplaced(object sender,ESRI.ArcGIS.Controls.IMapControlEvents2_OnMapReplacedEvent e) { //向MapControl2添加图层 if (axMapControl1.LayerCount > 0) { axMapControl2.Map = new MapClass(); for (int i = 0; i <= axMapControl1.Map.LayerCount - 1; i++) { axMapControl2.AddLayer(axMapControl1.get_Layer(i)); } axMapControl2.Extent = axMapControl1.Extent; axMapControl2.Refresh(); } } 接下来就是对MapControl2控件的On_MouseDown 和 On_MouseMove事件进行编写,这样可以让我们通过拖动鹰眼图上的红框反向操作MapControl1中的地图位置: private void axMapControl2_OnMouseMove(object sender,ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseMoveEvent e) { if (e.button == 1) { IPoint pPoint = new PointClass(); pPoint.PutCoords(e.mapX,e.mapY); axMapControl1.CenterAt(pPoint); axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography,null); } } private void axMapControl2_OnMouseDown(object sender,ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseDownEvent e) { if (axMapControl2.Map.LayerCount > 0) { if (e.button == 1) { IPoint pPoint = new PointClass(); //将点击位置的坐标转换后设为MapControl1的中心 pPoint.PutCoords(e.mapX,e.mapY); axMapControl1.CenterAt(pPoint); axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography,null); } else if (e.button == 2) { IEnvelope pEnv = axMapControl2.TrackRectangle(); axMapControl1.Extent = pEnv; axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography,null); } } } 最后在Form左下角再添加一个statusStrip控件,就可以实时显示当前图幅的范围了~ 属性表的访问与显示 大致思路如下:新建一个Form用来获取选中要素的属性表,而在初始界面右键点击对应的矢量要素后,便打开新form将要素属性表展示出来。 在Form2中,我们先将可能获得的属性表数据类型进行预定义: public static string ParseFieldType(esriFieldType fieldType)//将EsriType 转换为String { switch (fieldType) { case esriFieldType.esriFieldTypeBlob: return "System.String"; case esriFieldType.esriFieldTypeDate: return "System.DateTime"; case esriFieldType.esriFieldTypeDouble: return "System.Double"; case esriFieldType.esriFieldTypeGeometry: return "System.String"; case esriFieldType.esriFieldTypeGlobalID: return "System.String"; case esriFieldType.esriFieldTypeGUID: return "System.String"; case esriFieldType.esriFieldTypeInteger: return "System.Int32"; case esriFieldType.esriFieldTypeOID: return "System.String"; case esriFieldType.esriFieldTypeRaster: return "System.String"; case esriFieldType.esriFieldTypeSingle: return "System.Single"; case esriFieldType.esriFieldTypeSmallInteger: return "System.Int32"; case esriFieldType.esriFieldTypeString: return "System.String"; default: return "System.String"; } } 然后就是获取shpaefile的属性表了,这里我们主要使用 IField、IFeatureCursor、IFeature 这三个接口来达成目标:
代码如下: public void Opentable() { IFields pFields; pFields = pFeaturelayer.FeatureClass.Fields; dataGridView1.ColumnCount = pFields.FieldCount; for (int i = 0; i < pFields.FieldCount; i++) { string fldName = pFields.get_Field(i).Name; dataGridView1.Columns[i].Name = fldName; dataGridView1.Columns[i].ValueType = System.Type.GetType(ParseFieldType(pFields.get_Field(i).Type)); } IFeatureCursor pFeatureCursor; pFeatureCursor = pFeaturelayer.FeatureClass.Search(null,false); IFeature pFeature; pFeature = pFeatureCursor.NextFeature(); while (pFeature != null) { string[] fldValue = new string[pFields.FieldCount]; for (int i = 0; i < pFields.FieldCount; i++) { string fldName; fldName = pFields.get_Field(i).Name; if (fldName == pFeaturelayer.FeatureClass.ShapeFieldName) { fldValue[i] = Convert.ToString(pFeature.Shape.GeometryType); } else fldValue[i] = Convert.ToString(pFeature.get_Value(i)); } dataGridView1.Rows.Add(fldValue); pFeature = pFeatureCursor.NextFeature(); } } 搞定~接下来就是在初始界面选定要素后跳转界面显示属性表了~ 先在form1中进行预定义: IFeatureLayer pFeatureLayer = null; public IFeatureLayer pGlobalFeatureLayer; //定义全局变量 public ILayer player; 因为决定在右击鼠标时显示选项,在Form1窗体中添加contextMenuStrip控件,添加选项”显示属性表“,在click事件中打开新form: Form2 Ft = new Form2(player as IFeatureLayer); Ft.Show(); 然后就保证右键点击相关图层要素后能够成功打开对应属性表啦,这里主要用了TOCControl的 HitTest()方法:
在TOCControl控件的 OnMouseDown 事件下添加如下代码即可~: if (axMapControl1.LayerCount > 0) { esriTOCControlItem pItem = new esriTOCControlItem(); pGlobalFeatureLayer = new FeatureLayerClass(); IBasicMap pBasicMap = new MapClass(); object pOther = new object(); object pIndex = new object(); axTOCControl1.HitTest(e.x,e.y,ref pItem,ref pBasicMap,ref player,ref pOther,ref pIndex); } if (e.button == 2) { contextMenuStrip1.Show(axTOCControl1,e.x,e.y); } 大功告成~~ 点击后出现属性表~~~: (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |