VB.NET 在 AutoCAD 中获取实体交点

在AutoCAD中，使用VB.NET编程时，可以使用entity.IntersectWith(entity, Intersect.OnBothOperands, intersections, IntPtr.Zero, IntPtr.Zero)方法来获取两个实体的交点。\n\n以下是一个示例代码：\n\nvb\nImports Autodesk.AutoCAD.Runtime\nImports Autodesk.AutoCAD.ApplicationServices\nImports Autodesk.AutoCAD.DatabaseServices\nImports Autodesk.AutoCAD.Geometry\n\nPublic Class MyCommands\n <CommandMethod("GetEntityIntersections")> _\n Public Sub GetEntityIntersections()\n ' 获取当前文档和数据库\n Dim doc As Document = Application.DocumentManager.MdiActiveDocument\n Dim db As Database = doc.Database\n\n ' 开始在事务中操作\n Using trans As Transaction = db.TransactionManager.StartTransaction()\n ' 获取模型空间\n Dim ms As BlockTableRecord = trans.GetObject(db.CurrentSpaceId, OpenMode.ForRead)\n\n ' 创建两个实体\n Dim line1 As New Line(New Point3d(0, 0, 0), New Point3d(10, 10, 0))\n Dim line2 As New Line(New Point3d(0, 10, 0), New Point3d(10, 0, 0))\n\n ' 将实体添加到模型空间\n ms.AppendEntity(line1)\n ms.AppendEntity(line2)\n trans.AddNewlyCreatedDBObject(line1, True)\n trans.AddNewlyCreatedDBObject(line2, True)\n\n ' 创建交点集合\n Dim intersections As New Point3dCollection()\n\n ' 获取两个实体的交点\n line1.IntersectWith(line2, Intersect.OnBothOperands, intersections, IntPtr.Zero, IntPtr.Zero)\n\n ' 输出交点坐标\n For Each point As Point3d In intersections\n doc.Editor.WriteMessage("Intersection point: " & point.ToString())\n Next\n End Using\n End Sub\nEnd Class\n\n\n在上面的示例中，我们创建了两个直线实体line1和line2，并将它们添加到模型空间中。然后，使用line1.IntersectWith(line2, Intersect.OnBothOperands, intersections, IntPtr.Zero, IntPtr.Zero)方法获取两个实体的交点，并将交点坐标输出到命令行窗口中。\n\n请注意，上述代码仅为示例，实际使用时可能需要根据具体需求进行修改。