Class Hierarchy
AcUnderlayLayer
C++
class AcUnderlayLayer;
File
dbunderlayhost.h
Description
An abstract class that represents underlay layers in the drawing.
Underlays are similar to raster images but their content is snappable. An AcDbUnderlayReference must reference a compatible AcDbUnderlayDefinition. The AcDbUnderlayReference is responsible for the placement of the content within the drawing while AcDbUnderlayDefinition handles the linkage to the underlay content.
Instances of AcDbUnderlayReference derived concrete classes are inserted in a block table record. Instances of AcDbUnderlayDefinition derived concrete classes are inserted into a dictionary of the named object .
Links
AcUnderlayLayer Constructor, AcUnderlayLayer Methods, AcUnderlayLayer Operators