AcDbUnderlayReference

Class Hierarchy

AcRxObject
    AcGiDrawable
        AcDbObject
            AcDbEntity
                AcDbUnderlayReference
                    AcDbDgnReference
                    AcDbDwfReference
                    AcDbPdfReference

C++

class AcDbUnderlayReference : public AcDbEntity;

File

dbunderlayref.h

Description

Abstract class that represents underlays in the drawing. Underlays are similar to raster images, but their content is snappable. An AcDbUnderlayReference object must reference a compatible AcDbUnderlayDefinition object.

The AcDbUnderlayReference object is responsible for the placement of the content within the drawing, while the AcDbUnderlayDefinition object handles the linkage to the underlay content. Instances of AcDbUnderlayReference-derived concrete classes are inserted into a block table record. Instances of AcDbUnderlayDefinition-derived concrete classes are inserted into a dictionary under the named object dictionary.

Links

AcDbUnderlayReference Methods

See Also

AcDbUnderlayDefinition