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SuperMap iObjects .NET 11i 二次开发（十五）—— 类型转换之面转点 - 教程

news 2026/6/12 2:07:13

前言

上一篇博文简单介绍了有关类型转换之线面互转的相关操作，这个部分主要认识下类型转换之面转点的相关操作。

一、有关常用类说明

可跳转以下博文进行查看：

SuperMap iObjects .NET 11i 二次开发（十三）—— 类型转换之点线互转https://blog.csdn.net/Adoudoudou_/article/details/151954603?spm=1001.2014.3001.5502

SuperMap iObjects .NET 11i 二次开发（十四）—— 类型转换之线面互转https://blog.csdn.net/Adoudoudou_/article/details/151964135?spm=1001.2014.3001.5502

二、有关常用属性说明

GeoRegion.InnerPoint

获取几何对象的内点。

三、界面设计

桌面端在进行类型转换中的面转点时，结果为面对象的内点，如果需要转换结果为面的节点，那么需要先将面转为线再将线转为点。在原有界面基础上，添加类型转换相关功能点，如下图所示：

四、功能实现

1、面转点

private void 面转点ToolStripMenuItem_Click(object sender, EventArgs e)
{try{WorkspaceTreeNodeBase treeNode = D_workspaceControl.WorkspaceTree.SelectedNode as WorkspaceTreeNodeBase;if (treeNode == null){MessageBox.Show("请先选择一个数据集节点");return;}string polygonname = treeNode.Text;// 1. 获取选中的数据集并检查是否为面数据集Dataset selectedDataset = D_workspace.Datasources[0].Datasets[polygonname];// 类型检查if (selectedDataset.Type != DatasetType.Region){MessageBox.Show($"请选择面数据集进行操作！\n当前选择的数据集 '{polygonname}' 的类型为: {selectedDataset.Type}");return;}// 验证是否为矢量数据集if (!(selectedDataset is DatasetVector)){MessageBox.Show("选中的数据集不是矢量数据集");return;}DatasetVector polygonDataset = (DatasetVector)selectedDataset;// 检查数据集是否为空if (polygonDataset.RecordCount == 0){MessageBox.Show("面数据集中没有记录，无法进行转换");return;}// 设置点数据集的结构信息DatasetVectorInfo pointDatasetInfo = new DatasetVectorInfo();pointDatasetInfo.Name = polygonDataset.Name + "_Points";pointDatasetInfo.Type = DatasetType.Point;// 创建点数据集DatasetVector pointDataset = this.D_workspace.Datasources[0].Datasets.Create(pointDatasetInfo);if (pointDataset == null){MessageBox.Show("点数据集创建失败");return;}// 2. 遍历面数据集中的每条记录并转换为点using (Recordset polygonRecordset = polygonDataset.GetRecordset(false, CursorType.Dynamic))using (Recordset pointRecordset = pointDataset.GetRecordset(false, CursorType.Dynamic)){int totalPoints = 0;polygonRecordset.MoveFirst();while (!polygonRecordset.IsEOF){// 获取面几何对象GeoRegion geoRegion = polygonRecordset.GetGeometry() as GeoRegion;if (geoRegion != null){// 将面转换为线GeoLine geoLine = geoRegion.ConvertToLine();if (geoLine != null){// 处理线的每个部分（支持多部分线）for (int partIndex = 0; partIndex < geoLine.PartCount; partIndex++){Point2Ds points = geoLine[partIndex];// 为每个顶点创建点对象foreach (Point2D point2D in points){// 创建点几何对象GeoPoint point = new GeoPoint(point2D);// 添加新记录pointRecordset.AddNew(point);pointRecordset.Update();totalPoints++;}}}}polygonRecordset.MoveNext();}MessageBox.Show($"转换完成！共生成 {totalPoints} 个点要素到点数据集 '{pointDataset.Name}'");}}catch (Exception ex){MessageBox.Show($"面转点过程中发生错误: {ex.Message}");}
}

2、面转内点（同桌面端）

private void 面转内点ToolStripMenuItem_Click(object sender, EventArgs e)
{try{WorkspaceTreeNodeBase treeNode = D_workspaceControl.WorkspaceTree.SelectedNode as WorkspaceTreeNodeBase;if (treeNode == null){MessageBox.Show("请先选择一个数据集节点");return;}string polygonname = treeNode.Text;// 1. 获取选中的数据集并检查是否为面数据集Dataset selectedDataset = D_workspace.Datasources[0].Datasets[polygonname];// 类型检查if (selectedDataset.Type != DatasetType.Region){MessageBox.Show($"请选择面数据集进行操作！\n当前选择的数据集 '{polygonname}' 的类型为: {selectedDataset.Type}");return;}if (!(selectedDataset is DatasetVector)){MessageBox.Show("选中的数据集不是矢量数据集");return;}DatasetVector polygonDataset = (DatasetVector)selectedDataset;// 检查数据集是否为空if (polygonDataset.RecordCount == 0){MessageBox.Show("面数据集中没有记录，无法进行转换");return;}// 设置点数据集的结构信息DatasetVectorInfo pointDatasetInfo = new DatasetVectorInfo();pointDatasetInfo.Name = polygonDataset.Name + "_InnerPoints";pointDatasetInfo.Type = DatasetType.Point;// 创建点数据集DatasetVector pointDataset = this.D_workspace.Datasources[0].Datasets.Create(pointDatasetInfo);if (pointDataset == null){MessageBox.Show("点数据集创建失败");return;}// 2. 遍历面数据集中的每条记录并获取内点using (Recordset polygonRecordset = polygonDataset.GetRecordset(false, CursorType.Dynamic))using (Recordset pointRecordset = pointDataset.GetRecordset(false, CursorType.Dynamic)){int processedCount = 0;int totalCount = polygonDataset.RecordCount;polygonRecordset.MoveFirst();while (!polygonRecordset.IsEOF){// 获取面几何对象GeoRegion geoRegion = polygonRecordset.GetGeometry() as GeoRegion;if (geoRegion != null){// 获取面的内点（质心点）Point2D innerPoint2D = geoRegion.InnerPoint;if (innerPoint2D != null){// 将Point2D转换为GeoPointGeoPoint geoPoint = new GeoPoint(innerPoint2D);// 添加新的点记录pointRecordset.AddNew(geoPoint);pointRecordset.Update();processedCount++;}}polygonRecordset.MoveNext();}MessageBox.Show($"转换完成！共生成 {processedCount} 个内点到点数据集 '{pointDataset.Name}'");}}catch (Exception ex){MessageBox.Show($"面转内点过程中发生错误: {ex.Message}");}
}