VB.NET: 提取AutoCAD中DMX图层的坐标并输出到文本文件

在AutoCAD中提取所有DMX图层的坐标并输出到文本，可以使用以下VB.NET代码：\n\nvb\nImports Autodesk.AutoCAD.ApplicationServices\nImports Autodesk.AutoCAD.DatabaseServices\nImports Autodesk.AutoCAD.EditorInput\nImports Autodesk.AutoCAD.Geometry\n\nPublic Class DmxLayerCoordinatesExtractor\n\n Public Sub ExtractDmxLayerCoordinates()\n Dim doc As Document = Application.DocumentManager.MdiActiveDocument\n Dim db As Database = doc.Database\n Dim ed As Editor = doc.Editor\n\n Using trans As Transaction = db.TransactionManager.StartTransaction()\n Dim bt As BlockTable = trans.GetObject(db.BlockTableId, OpenMode.ForRead)\n Dim btr As BlockTableRecord = trans.GetObject(bt(BlockTableRecord.ModelSpace), OpenMode.ForRead)\n\n Dim dmxLayerIds As New List(Of ObjectId)()\n For Each id As ObjectId In btr\n Dim ent As Entity = trans.GetObject(id, OpenMode.ForRead)\n If ent.Layer = 'DMX' Then\n dmxLayerIds.Add(id)\n End If\n Next\n\n If dmxLayerIds.Count = 0 Then\n ed.WriteMessage('No entities on DMX layer.')\n Return\n End If\n\n Dim outputFile As String = 'C:\DMXLayerCoordinates.txt'\n Using writer As New System.IO.StreamWriter(outputFile)\n For Each id As ObjectId In dmxLayerIds\n Dim ent As Entity = trans.GetObject(id, OpenMode.ForRead)\n writer.WriteLine($'Entity Id: {id}')\n writer.WriteLine($'Layer: {ent.Layer}')\n writer.WriteLine($'Coordinates: {GetEntityCoordinates(ent)}')\n writer.WriteLine()\n Next\n End Using\n\n ed.WriteMessage($'DMX layer coordinates extracted to {outputFile}.')\n End Using\n End Sub\n\n Private Function GetEntityCoordinates(ByVal ent As Entity) As String\n Dim coordinates As String = ''\n\n If TypeOf ent Is Line Then\n Dim line As Line = CType(ent, Line)\n coordinates = $'Start: {line.StartPoint}, End: {line.EndPoint}'\n ElseIf TypeOf ent Is Polyline Then\n Dim polyline As Polyline = CType(ent, Polyline)\n For i As Integer = 0 To polyline.NumberOfVertices - 1\n coordinates += $'{polyline.GetPoint3dAt(i)}, '\n Next\n coordinates = coordinates.TrimEnd(', ')\n ElseIf TypeOf ent Is Circle Then\n Dim circle As Circle = CType(ent, Circle)\n coordinates = $'Center: {circle.Center}, Radius: {circle.Radius}'\n End If\n\n Return coordinates\n End Function\n\nEnd Class\n\n\n您可以将上述代码添加到您的VB.NET项目中，并在需要提取DMX图层坐标的地方调用ExtractDmxLayerCoordinates方法。输出的坐标将保存在C:\DMXLayerCoordinates.txt文件中。