-- File:	BRepAlgoAPI.cdl
-- Created:	Tue Jul  6 17:29:03 1993
-- Author:	Remi LEQUETTE 
-- modified by  Peter KURNEV Tue Mar  5 14:01:51 2002
---Copyright:	 Matra Datavision 1993



package BRepAlgoAPI 

    	---Purpose:  The BRepAlgoAPI package provides a full range of
    	-- services to perform Boolean Operations on arguments (shapes
    	-- that are defined in the BRep data structures). The
    	-- implemented new algorithm is intended to replace the Old
    	-- Boolean Operations algorithm in the BRepAlgoAPI package.
    	-- The New algorithm is free of a large number of weak spots
    	-- and limitations characteristics of the Old algorithm. 
    	-- It is more powerful and flexible. 
    	-- It can process arguments the Old algorithm was not adapted for.
    	-- The new algorithm is based on a new approach to operations
    	-- with interfered shapes. The advantages of the new algorithm
    	-- include an ability to treat arguments that have shared
    	-- entities. It can properly process two solids with shared
    	-- faces (in terms of TopoDS_Shape::IsSame()), two
    	-- faces that have shared edges and so on. Now the New Boolean
    	-- Operation algorithm can treat a wide range of shapes while the
    	-- Old one fails on them.
    	-- A generalization of treatment of same-domain faces
    	-- was included into the New algorithm. Two faces that share
    	-- the same domain are processed according to the common rule
    	-- even if the underlying surfaces are of different types. This
    	-- allows to execute Boolean Operations properly for the same
    	-- domain faces. It also concerns solids and shells that have the
    	-- same domain faces. It is quite frequent when two faces share
    	-- the same domain. And the New algorithm successfully copes
    	-- with it in contrast to the Old one.
    	--  Generalization oftreatment of degenerated edges
    	-- gives a possibility to process them properly. Although there
    	-- are still some difficulties with processing faces in areas close
    	-- to degenerated edges.
    	--  Now the processing of arguments having internal sub-shapes gives
    	-- a correct result. Internal sub-shape means a sub-shape of a
    	-- shape with the orientation TopAbs_INTERNAL and is located
    	-- inside the shape boundaries. The New algorithm processes faces
    	-- with internal edges properly. The new API of the Boolean
    	-- Operations (in addition to the old API) allows to reuse the
    	-- already computed interference between arguments in different
    	-- types of Boolean Operations. It is possible to use once computed
    	-- interference in FUSE, CUT and COMMON operations on given
    	-- arguments. So there is no need to re-compute the interference
    	-- between the arguments. It allows to reduce time for more than one
    	-- operation on given arguments.
    	--   The shape type of a Boolean Operation result and types of the arguments:
    	-- -      For arguments with the same shape type (e.g. SOLID /
    	--   SOLID) the type of the resulting shape will be a
    	--   COMPOUND, containing shapes of this type;
    	-- -      For arguments with different shape types (e.g.
    	--   SHELL / SOLID) the type of the resulting shape will be a
    	--   COMPOUND, containing shapes of the type that is the same as
    	--   that of the low type of the argument. Example: For
    	--   SHELL/SOLID the result is a COMPOUND of SHELLs. 
    	-- -      For arguments with different shape types some of
    	--   Boolean Operations can not be done using the default
    	--   implementation, because of a non-manifold type of the
    	--   result. Example: the FUSE operation for SHELL and SOLID
    	--   can not be done, but the CUT operation can be done, where
    	--   SHELL is the object and SOLID is the tool.
    	-- It is possible to perform Boolean Operations on arguments
    	-- of the COMPOUND shape type. In this case each compound must not
    	-- be heterogeneous, i.e. it must contain equidimensional shapes
    	-- (EDGEs or/and WIREs, FACEs or/and SHELLs, SOLIDs). SOLIDs
    	-- inside the COMPOUND must not contact (intersect or touch)
    	-- each other. The same condition is true for SHELLs or FACEs,
    	-- WIREs or EDGEs.
    	-- It does not support Boolean Operations for COMPSOLID type of shape.
        
uses  
   TopTools, 
   TopoDS, 
   gp,
   Geom,
   Geom2d,
   BOP,  
   BOPTools,
   BRepBuilderAPI   
is
	     
    deferred class BooleanOperation; 
    	---Purpose: Root class for boolean operations.
    
    class Fuse;                    
    	---Purpose: Perform the boolean operation FUSE.
    	---
    class Common;                         
    	---Purpose: Perform the boolean operation COMMON.
    	--- 
    class Cut;                           
    	---Purpose: Perform the boolean operation CUT.
 	---    
    class Section;                       
    	---Purpose: Perform the operation SECTION. 
	--- 
	
end BRepAlgoAPI;