分解对象 （.NET）

分解对象会将单个对象转换为其组成部分。您可以使用函数来分解对象，它需要一个用于返回结果对象的对象。例如，分解折线可能会导致创建包含多条线和弧的对象集合。ExplodeDBObjectCollection

如果块被分解，则返回的对象集合包含定义块的图形对象。分解对象后，原始对象保持不变。如果希望返回的对象替换原始对象，则必须擦除原始对象，然后将返回的对象添加到块表记录中。

分解折线

本示例创建一个轻型折线对象，然后将该折线分解为最简单的对象。折线分解后，将释放折线，并将返回的对象添加到模型空间中。

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
 
<CommandMethod("ExplodeObject")> _
Public Sub ExplodeObject()
    '' Get the current document and database
    Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument
    Dim acCurDb As Database = acDoc.Database

    '' Start a transaction
    Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()

        '' Open the Block table for read
        Dim acBlkTbl As BlockTable
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, _
                                     OpenMode.ForRead)

        '' Open the Block table record Model space for write
        Dim acBlkTblRec As BlockTableRecord
        acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), _
                                        OpenMode.ForWrite)

        '' Create a lightweight polyline
        Using acPoly As Polyline = New Polyline()
            acPoly.AddVertexAt(0, New Point2d(1, 1), 0, 0, 0)
            acPoly.AddVertexAt(1, New Point2d(1, 2), 0, 0, 0)
            acPoly.AddVertexAt(2, New Point2d(2, 2), 0, 0, 0)
            acPoly.AddVertexAt(3, New Point2d(3, 2), 0, 0, 0)
            acPoly.AddVertexAt(4, New Point2d(4, 4), 0, 0, 0)
            acPoly.AddVertexAt(5, New Point2d(4, 1), 0, 0, 0)

            '' Sets the bulge at index 3
            acPoly.SetBulgeAt(3, -0.5)

            '' Explodes the polyline
            Dim acDBObjColl As DBObjectCollection = New DBObjectCollection()
            acPoly.Explode(acDBObjColl)

            For Each acEnt As Entity In acDBObjColl
                '' Add the new object to the block table record and the transaction
                acBlkTblRec.AppendEntity(acEnt)
                acTrans.AddNewlyCreatedDBObject(acEnt, True)
            Next

            '' Dispose of the in memory polyline
        End Using

        '' Save the new objects to the database
        acTrans.Commit()
    End Using
End Sub

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
 
[CommandMethod("ExplodeObject")]
public static void ExplodeObject()
{
    // Get the current document and database
    Document acDoc = Application.DocumentManager.MdiActiveDocument;
    Database acCurDb = acDoc.Database;

    // Start a transaction
    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        // Open the Block table for read
        BlockTable acBlkTbl;
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                                        OpenMode.ForRead) as BlockTable;

        // Open the Block table record Model space for write
        BlockTableRecord acBlkTblRec;
        acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                                        OpenMode.ForWrite) as BlockTableRecord;

        // Create a lightweight polyline
        using (Polyline acPoly = new Polyline())
        {
            acPoly.AddVertexAt(0, new Point2d(1, 1), 0, 0, 0);
            acPoly.AddVertexAt(1, new Point2d(1, 2), 0, 0, 0);
            acPoly.AddVertexAt(2, new Point2d(2, 2), 0, 0, 0);
            acPoly.AddVertexAt(3, new Point2d(3, 2), 0, 0, 0);
            acPoly.AddVertexAt(4, new Point2d(4, 4), 0, 0, 0);
            acPoly.AddVertexAt(5, new Point2d(4, 1), 0, 0, 0);

            // Sets the bulge at index 3
            acPoly.SetBulgeAt(3, -0.5);

            // Explodes the polyline
            DBObjectCollection acDBObjColl = new DBObjectCollection();
            acPoly.Explode(acDBObjColl);

            foreach (Entity acEnt in acDBObjColl)
            {
                // Add the new object to the block table record and the transaction
                acBlkTblRec.AppendEntity(acEnt);
                acTrans.AddNewlyCreatedDBObject(acEnt, true);
            }

            // Dispose of the in memory polyline
        }

        // Save the new objects to the database
        acTrans.Commit();
    }
}

Sub ExplodeObject()
    Dim plineObj As AcadLWPolyline
    Dim points(0 To 11) As Double
 
    ' Define the 2D polyline points
    points(0) = 1: points(1) = 1
    points(2) = 1: points(3) = 2
    points(4) = 2: points(5) = 2
    points(6) = 3: points(7) = 2
    points(8) = 4: points(9) = 4
    points(10) = 4: points(11) = 1
 
    ' Create a light weight Polyline object
    Set plineObj = ThisDrawing.ModelSpace. _
                                 AddLightWeightPolyline(points)
 
    ' Set the bulge on one segment to vary the
    ' type of objects in the polyline
    plineObj.SetBulge 3, -0.5
 
    ' Explode the polyline
    Dim explodedObjects As Variant
    explodedObjects = plineObj.Explode
 
    ' Erase the polyline
    plineObj.Erase
End Sub