ArcEngine

2024-06-17 21:38| 来源: 网络整理| 查看: 265

所有的代码已经传到了我的GitHub，需要的请自取，GitHub项目地址：https://github.com/Weltra/T_ArcMap

GP工具简介

地理处理是ArcGIS 的一个重要概念，其目的是便于用户自动执行GIS的空间分析和建模任务。地理处理工具是将GIS中常用、可重复的操作，如提取与叠加数据、更改地图投影等封装成一个具有参数输人输出的交互式图形界面。地理处理通过脚本将一系列的工具按照一定的操作顺序结合在一起，共同完成一项地理处理任务。其工具都储存在工具箱中，ArcGIS提供了数百种工具，并根据功能将它们分别放到了十余个工具箱中。ArcToolbox是所有工具的集合，提供工具运行的环境。在ArcGIS Engine编程过程中，可以通过调用GP工具来实现某些常用的功能。

调用GP工具主要应用了Geoprocessor类，这个类也可以调用人们自定义的工具。在使用Geoprocessor 类时，需要首先定义一个Geoprocessor 对象， Geoprocessor是简化调用Geoprocessing工具任务的主要对象。这个对象是执行ArcGIS 中任何Geoprocessing 工具的唯一访问点，它是一个粗粒度对象，包含了许多属性和方法，在设置完相关的参数后，则通过Geoprocessor 的Excute函数来执行，Excute方法中需要一个操作对象作为参数，如lntersect、Clip 等，具体包含哪些操作类，可通过ArcToolBox和Esri的帮助文档查找。

缓冲区分析

（1）建立【缓冲区分析】窗体

该窗体用于显示及设置输入图层、缓冲半径、融合类型、输出路径以及执行缓冲区分析功能的按钮等，其界面入下图所示：

（2）功能实现的核心代码

public partial class BufferAnalysisTool : Form { public IMap pMap { get; set; } public AxMapControl mapControl { get; set; } public BufferAnalysisTool() { InitializeComponent(); } private void BufferAnalysisTool_Load(object sender, EventArgs e) { pMap = mapControl.Map; //向图层comboBox1中预置噪音来源 if (pMap.LayerCount > 0) { for (int i = 0; i < pMap.LayerCount; i++) { ILayer pLayer = pMap.get_Layer(i); if (pLayer != null) { if (pLayer is IFeatureLayer) { comboBox_InputDataset.Items.Add(pLayer.Name); } } } comboBox_InputDataset.SelectedIndex = 0; DistanceTextBox.Text = "500"; this.comboBox1.Items.Add("NONE");//选择项1 this.comboBox1.Items.Add("ALL"); comboBox1.SelectedIndex = 0; textEdit_Output.Text = System.Environment.CurrentDirectory + "buffer.shp"; } else return; } private void button3_Click(object sender, EventArgs e) { this.Close(); } private void button1_Click(object sender, EventArgs e) { SaveFileDialog flg = new SaveFileDialog(); flg.Title = "保存路径"; flg.Filter = "ShpFile(*shp)|*.shp"; flg.ShowDialog(); textEdit_Output.Text = flg.FileName; } private ILayer GetLayerByName(IMap pMap, string layerName) { ILayer pLayer = null; ILayer tempLayer = null; try { for (int i = 0; i < pMap.LayerCount; i++) { tempLayer = pMap.Layer[i]; if (tempLayer.Name.ToUpper() == layerName.ToUpper()) //判断名字大写是否一致 { pLayer = tempLayer; break; } } } catch (Exception ex) { MessageBox.Show(ex.Message); } return pLayer; } private void button2_Click(object sender, EventArgs e) { try { ILayer inputDataset = GetLayerByName(pMap, comboBox_InputDataset.Text.Trim()); IFeatureLayer inputLayer = inputDataset as IFeatureLayer; //缓冲区分析-GP工具调用 Geoprocessor gp = new Geoprocessor(); gp.OverwriteOutput = true; ESRI.ArcGIS.AnalysisTools.Buffer pBuffer = new ESRI.ArcGIS.AnalysisTools.Buffer(); pBuffer.in_features = inputLayer; //设置生成结果存储路径 pBuffer.out_feature_class = textEdit_Output.Text; //设置缓冲区距离 string buffer_distance = DistanceTextBox.Text + " Meters"; pBuffer.buffer_distance_or_field = buffer_distance; pBuffer.dissolve_option = comboBox1.Text; //执行缓冲区分析 gp.Execute(pBuffer, null); //将生成结果添加到地图中 string pPath = System.IO.Path.GetDirectoryName(textEdit_Output.Text); //获取文件路径 string pName = System.IO.Path.GetFileName(textEdit_Output.Text); //获取文件名 this.mapControl.AddShapeFile(pPath, pName); this.mapControl.MoveLayerTo(1, 0); } catch (Exception ex) { MessageBox.Show(ex.Message); } } }

（3）在 menuStrip 中添加一个geoProcessing选项，并在其子选项中BufferTool选项，为其绑定 Click 事件。在 Click 事件处理方法中添加代码，显示【裁剪】窗体。

private void bufferToolToolStripMenuItem_Click(object sender, EventArgs e) { GeoProcessing.BufferAnalysisTool BF = new GeoProcessing.BufferAnalysisTool(); BF.mapControl = this.axMapControl1; BF.ShowDialog(); } 叠置分析

（1）建立叠置分析窗体

该窗体用于显示及设置与参与裁剪的数据、裁剪后输出的数据路径以及执行裁剪功能的按钮等，其界面入下图所示：

（2）在叠置分析窗体中完成裁剪功能的代码如下：

public partial class OverlayAnalysisTool : Form { public OverlayAnalysisTool() { InitializeComponent(); } //定义全局变量 public IMap pMap { get; set; } public AxMapControl mapControl { get; set; } private void OverlayAnalysisTool_Load(object sender, EventArgs e) { try { pMap = mapControl.Map; if (pMap == null) return; //清空combobox comboBox_InputDataset.Items.Clear(); comboBox_ClipDataset.Items.Clear(); string layerName; //用于储存图层名字 for (int i = 0; i < pMap.LayerCount; i++) { layerName = pMap.Layer[i].Name; comboBox_InputDataset.Items.Add(layerName); comboBox_ClipDataset.Items.Add(layerName); } } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void button2_OK_Click(object sender, EventArgs e) { if (pMap == null) return; //获取数据集 ILayer inputDataset = GetLayerByName(pMap, comboBox_InputDataset.Text.Trim()); ILayer clipDataset = GetLayerByName(pMap, comboBox_ClipDataset.Text.Trim()); if (inputDataset != null && clipDataset != null) { IFeatureLayer inputLayer = inputDataset as IFeatureLayer; IFeatureLayer clipLayer = clipDataset as IFeatureLayer; //利用裁剪方法来进行叠加分析 IBasicGeoprocessor bGP = new BasicGeoprocessorClass(); bGP.SpatialReference = pMap.SpatialReference; //设置空间参考 //创建FeatureClassNameClass对象，用于获取输入数据集的一些基本信息 IFeatureClassName pOutput = new FeatureClassName() as IFeatureClassName; pOutput.FeatureType = inputLayer.FeatureClass.FeatureType; pOutput.ShapeFieldName = inputLayer.FeatureClass.ShapeFieldName; pOutput.ShapeType = inputLayer.FeatureClass.ShapeType; //利用IDataset获得IWorkspaceName string fileDirectory = System.IO.Path.GetDirectoryName(textEdit_Output.Text.Trim()); string fileName = System.IO.Path.GetFileName(textEdit_Output.Text.Trim()); IWorkspaceFactory pWsFc = new ShapefileWorkspaceFactory(); IWorkspace pWs = pWsFc.OpenFromFile(fileDirectory, 0); //创建一个工作空间对象 IDataset pDataset = pWs as IDataset; IWorkspaceName pWsN = pDataset.FullName as IWorkspaceName; //获取工作空间的信息(获取输出路径) IDatasetName pDatasetName = pOutput as IDatasetName; //获取或设置数据集中成员的名称信息 pDatasetName.Name = fileName; //设置数据集中的数据成员的名字 pDatasetName.WorkspaceName = pWsN; //设置输出的工作空间(输出路径) IFeatureClass featureClass = bGP.Clip(inputLayer.FeatureClass as ITable, false, clipLayer.FeatureClass as ITable, false, 0.01, pOutput); if (featureClass != null) { IFeatureLayer featLayer = new FeatureLayerClass(); featLayer.FeatureClass = featureClass; featLayer.Name = featureClass.AliasName; //将结果添加到控件中 mapControl.AddLayer(featLayer); mapControl.Refresh(); } } } private void simpleButton_Cancel_Click(object sender, EventArgs e) { this.Close(); } private ILayer GetLayerByName(IMap pMap, string layerName) { ILayer pLayer = null; ILayer tempLayer = null; try { for (int i = 0; i < pMap.LayerCount; i++) { tempLayer = pMap.Layer[i]; if (tempLayer.Name.ToUpper() == layerName.ToUpper()) //判断名字大写是否一致 { pLayer = tempLayer; break; } } } catch (Exception ex) { MessageBox.Show(ex.Message); } return pLayer; } private void simpleButton_Output_Click(object sender, EventArgs e) { SaveFileDialog flg = new SaveFileDialog(); flg.Title = "保存路径"; flg.Filter = "ShpFile(*shp)|*.shp"; flg.ShowDialog(); textEdit_Output.Text = flg.FileName; } }

（3）在主窗体调用叠置分析窗口

在 menuStrip 中添加一个geoProcessing选项，并在其子选项中添加overlapTool选项，为其绑定 Click 事件。在 Click 事件处理方法中添加代码，显示【裁剪】窗体。

private void overlapToolToolStripMenuItem_Click(object sender, EventArgs e) { GeoProcessing.OverlayAnalysisTool oA = new GeoProcessing.OverlayAnalysisTool(); oA.mapControl = this.axMapControl1; oA.ShowDialog(); } 结果缓冲区分析功能

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