VB.NET 获取AutoCAD 图层交点位置并提取下方文字内容

{"title":"VB.NET 获取AutoCAD 图层交点位置并提取下方文字内容","description":"本文介绍如何在VB.NET中获取AutoCAD文件中sjx图层和zhix图层相交点位置，并垂直向下获取第一个文字样式内容。提供了示例代码和详细解释，帮助开发者快速理解和应用。","keywords":"AutoCAD, VB.NET, 图层, 交点, 文字, 提取, 代码示例","content":"以下是在VB.NET中获取AutoCAD文件中sjx图层和zhix图层相交点位置，并垂直向下获取第一个文字样式内容的示例代码：\n\nvb\nImports Autodesk.AutoCAD.ApplicationServices\nImports Autodesk.AutoCAD.DatabaseServices\nImports Autodesk.AutoCAD.EditorInput\nImports Autodesk.AutoCAD.Geometry\n\nPublic Class AcadInteraction\n Public Sub GetIntersectPointAndText()\n ' 获取当前AutoCAD文档和数据库\n Dim doc As Document = Application.DocumentManager.MdiActiveDocument\n Dim db As Database = doc.Database\n\n ' 启动事务\n Using trans As Transaction = db.TransactionManager.StartTransaction()\n ' 获取当前空间\n Dim space As BlockTableRecord = trans.GetObject(db.CurrentSpaceId, OpenMode.ForRead)\n\n ' 获取sjx图层和zhix图层的ID\n Dim sjxLayerId As ObjectId = GetLayerId("sjx", db)\n Dim zhixLayerId As ObjectId = GetLayerId("zhix", db)\n\n ' 创建一个选择集，用于存储相交点\n Dim selectionSet As New SelectionSet()\n\n ' 遍历图层中的每个实体，找到相交点\n For Each objId As ObjectId In space\n Dim entity As Entity = trans.GetObject(objId, OpenMode.ForRead)\n\n ' 判断实体是否在sjx或zhix图层中\n If entity.LayerId = sjxLayerId OrElse entity.LayerId = zhixLayerId Then\n ' 如果是线段或直线\n If TypeOf entity Is Line OrElse TypeOf entity Is LineSegment2d Then\n ' 判断实体是否与另一个图层相交\n If IsIntersecting(entity, sjxLayerId, zhixLayerId, trans) Then\n ' 获取相交点的位置\n Dim intersectPoint As Point3d = GetIntersectPoint(entity, sjxLayerId, zhixLayerId, trans)\n\n ' 将相交点添加到选择集中\n selectionSet.Add(objId)\n\n ' 获取相交点下方最近的文字内容\n Dim textContent As String = GetTextBelow(intersectPoint, trans)\n Console.WriteLine("相交点位置：{0}", intersectPoint.ToString())\n Console.WriteLine("文字内容：{0}", textContent)\n\n ' 只获取第一个相交点的文字内容\n Exit For\n End If\n End If\n End If\n Next\n\n ' 提交事务\n trans.Commit()\n\n ' 将选择集添加到当前选择集中\n doc.Editor.SetCurrentSelection(selectionSet)\n End Using\n End Sub\n\n ' 根据名称获取图层ID\n Private Function GetLayerId(ByVal layerName As String, ByVal db As Database) As ObjectId\n Using trans As Transaction = db.TransactionManager.StartTransaction()\n Dim layerTable As LayerTable = trans.GetObject(db.LayerTableId, OpenMode.ForRead)\n If layerTable.Has(layerName) Then\n Dim layerId As ObjectId = layerTable(layerName)\n Return layerId\n Else\n Return ObjectId.Null\n End If\n End Using\n End Function\n\n ' 判断实体是否与另一个图层相交\n Private Function IsIntersecting(ByVal entity As Entity, ByVal layer1Id As ObjectId, ByVal layer2Id As ObjectId, ByVal trans As Transaction) As Boolean\n Dim layer1Geom As New DBObjectCollection()\n Dim layer2Geom As New DBObjectCollection()\n\n Dim layer1Filter As New LayerFilter(layer1Id)\n Dim layer2Filter As New LayerFilter(layer2Id)\n\n layer1Geom.Add(entity)\n layer2Geom.Add(entity)\n\n ' 判断实体是否与另一个图层相交\n Return RegionExtensions.AreOverlapping(layer1Geom, layer1Filter, layer2Geom, layer2Filter, trans)\n End Function\n\n ' 获取相交点的位置\n Private Function GetIntersectPoint(ByVal entity As Entity, ByVal layer1Id As ObjectId, ByVal layer2Id As ObjectId, ByVal trans As Transaction) As Point3d\n Dim layer1Geom As New DBObjectCollection()\n Dim layer2Geom As New DBObjectCollection()\n\n Dim layer1Filter As New LayerFilter(layer1Id)\n Dim layer2Filter As New LayerFilter(layer2Id)\n\n layer1Geom.Add(entity)\n layer2Geom.Add(entity)\n\n ' 获取相交点的位置\n Dim intersectPoints As Point3dCollection = RegionExtensions.GetIntersectionPoints(layer1Geom, layer1Filter, layer2Geom, layer2Filter, trans)\n \n ' 返回第一个相交点\n Return intersectPoints(0)\n End Function\n\n ' 获取相交点下方最近的文字内容\n Private Function GetTextBelow(ByVal intersectPoint As Point3d, ByVal trans As Transaction) As String\n Dim doc As Document = Application.DocumentManager.MdiActiveDocument\n Dim db As Database = doc.Database\n\n ' 创建一个2D的点，用于比较距离\n Dim point2d As New Point2d(intersectPoint.X, intersectPoint.Y)\n\n ' 获取当前空间\n Dim space As BlockTableRecord = trans.GetObject(db.CurrentSpaceId, OpenMode.ForRead)\n\n ' 创建一个选择集，用于存储文字\n Dim selectionSet As New SelectionSet()\n\n ' 遍历图层中的每个实体，找到位于相交点下方的文字\n For Each objId As ObjectId In space\n Dim entity As Entity = trans.GetObject(objId, OpenMode.ForRead)\n\n ' 判断实体是否为文字\n If TypeOf entity Is DBText Then\n Dim text As DBText = TryCast(entity, DBText)\n \n ' 判断文字是否位于相交点下方\n If text.Position.Y < point2d.Y Then\n ' 将文字添加到选择集中\n selectionSet.Add(objId)\n End If\n End If\n Next\n\n ' 获取选择集中第一个文字的内容\n If selectionSet.Count > 0 Then\n Dim firstTextObjId As ObjectId = selectionSet.GetObjectIds()(0)\n Dim firstText As DBText = trans.GetObject(firstTextObjId, OpenMode.ForRead)\n Return firstText.TextString\n Else\n Return String.Empty\n End If\n End Function\nEnd Class\n\n\n你可以在你的应用程序中实例化 AcadInteraction 类，并调用 GetIntersectPointAndText 方法来获取sjx图层和zhix图层相交点位置，并垂直向下获取第一个文字样式的内容。