程序实现曲面切割
下面这段代码来自一个客户,实现用一个曲面切割另外一个,比如用一块铁板把一个两头有盖的汽油桶切成两个开口的桶。原理很简单,就是利用了AcDbSurface的SliceBySurface方法:
切割前:
切割后,为了看得清楚,把无盖桶移动了一下:
代码:
[CommandMethod("TestSliceSurface")] public void TestSliceSurface() { Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument; var ed = doc.Editor; using (DocumentLock docLock = doc.LockDocument()) { Database db = doc.Database; using (Transaction ts = db.TransactionManager.StartTransaction()) { BlockTableRecord btr = ts.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord; var peo1 = new PromptEntityOptions("\nSelect first surface"); peo1.SetRejectMessage("\nMust be a surface."); peo1.AddAllowedClass(typeof(AcDb.Surface), false); var per1 = ed.GetEntity(peo1); if (per1.Status != PromptStatus.OK) return; var obj1 = ts.GetObject(per1.ObjectId, OpenMode.ForWrite); var surf1 = obj1 as AcDb.Surface; if (surf1 == null) { ed.WriteMessage("\nFirst object must be a surface."); return; } var peo2 = new PromptEntityOptions("\nSelect second surface"); peo2.SetRejectMessage("\nMust be a surface."); peo2.AddAllowedClass(typeof(AcDb.Surface), false); var per2 = ed.GetEntity(peo2); if (per2.Status != PromptStatus.OK) return; var obj2 = ts.GetObject(per2.ObjectId, OpenMode.ForWrite); var surf2 = obj2 as AcDb.Surface; if (surf2 == null) { ed.WriteMessage("\nSecond object must be a surface."); return; } SurfaceSliceResults ss = surf1.SliceBySurface(surf2); btr.AppendEntity(ss.NegativeHalfSurface); ts.AddNewlyCreatedDBObject(ss.NegativeHalfSurface, true); ts.Commit(); ts.Dispose(); } docLock.Dispose(); } }
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