Class Hierarchy
AcRxObject AcGiDrawable AcDbObject AcDbEntity AcDbUnderlayReference AcDbDgnReference
C++
class AcDbDgnReference : public AcDbUnderlayReference;
File
dbunderlayref.h
Description
Represents DGN underlays in the drawing. Underlays are similar to raster images but their content is snappable.