得到当前图形中全部实体的最小包围盒

AcDbBlockTable *pBlkTbl; AcDbBlockTableRecord *pBlkTblRcd; acdbHostApplicationServices()->workingDatabase() ->getBlockTable(pBlkTbl, AcDb::kForRead); pBlkTbl->getAt(ACDB_MODEL_SPACE, pBlkTblRcd, AcDb:
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