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-- File: BRepFeat_LocalOperation.cdl
-- Created: Tue Jun 13 11:27:01 1995
-- Author: Jacques GOUSSARD
-- <jag@bravox>
---Copyright: Matra Datavision 1995
class LocalOperation from BRepFeat inherits Builder from BRepFeat
---Purpose: One of the most significant
-- aspects of BRepFeat functionality is the use of local operations as
-- opposed to global ones. In a global operation, you would first
-- construct a form of the type you wanted in your final feature, and
-- then remove matter so that it could fit into your initial basis
-- object. In a local operation, however, you specify the domain
-- of the feature construction with aspects of the shape on which the
-- feature is being created. These semantics are expressed in terms
-- of a member shape of the basis shape from which - or up to which
-- - matter will be added or removed. As a result, local
-- operations make calculations simpler and faster than global operations.
-- In BRepFeat, the semantics of local operations define features
-- constructed from a contour or a part of the basis shape referred to as the tool.
uses
Shape from TopoDS,
ListOfShape from TopTools
raises
NotDone from StdFail,
ConstructionError from Standard
is
Create
---Purpose: Builds the framework to store the topological shape
-- which is to be created by the local operation.
-- Initializes the empty constructor.
returns LocalOperation from BRepFeat;
---C++: inline
Create(S: Shape from TopoDS)
---C++: inline
---Purpose: Builds the framework to store the topological shape
-- which is to be created by the local operation.
-- Initializes shape S for a local operation.
-- The exception ConstructionError is raised if <S> is a null shape.
returns LocalOperation from BRepFeat
raises ConstructionError from Standard;
Create(S1,S2: Shape from TopoDS)
---C++: inline
---Purpose: Builds the framework to store the topological shape
-- which is to be created by the local operation.
-- Initializes S1 and S2 for a local operation.
-- The exception ConstructionError is raised if <S> is a null shape.
returns LocalOperation from BRepFeat
raises ConstructionError from Standard;
-- Init(me: in out; S: Shape from TopoDS) is inherited from BRepFeat_Builder.
-- Init(me: in out; S,T: Shape from TopoDS) is inherited from BRepFeat_Builder.
Perform(me: in out; T : Shape from TopoDS;
L : ListOfShape from TopTools;
Fuse : Boolean from Standard)
---Purpose: Performs the local operation on the formerly given
-- shape, with the tool <T>. <L> defines a set of
-- faces of the shape. The list may not be empty.
-- The boolean <Fuse> gives the type of operation. If
-- set to Standard_True, the operation is a fusion.
-- If set to Standard_False, the operation is a
-- cutting one.
--
-- The Perform process stops just before constructing
-- any result in order to authorize the selection of
-- parts of the tool. After a call to Perform, it is
-- possible to call BuilPartsOfTool, then
-- RemovePart/ActivatePart to select valid parts, and
-- it is necessary to call PerformResult to get any
-- result.
---C++: inline
raises ConstructionError from Standard
--- The exception is raised if <T> is null or same as the shape.
is static;
Perform(me: in out; LShape : ListOfShape from TopTools;
LTool : ListOfShape from TopTools;
Fuse : Boolean from Standard)
---Purpose: Performs the local operation on the formerly given
-- shape and tool. <LShape> defines a set of faces
-- of the shape, <LTool> a set of faces of the tool.
-- The boolean <Fuse> gives the type of operation.
-- If set to Standard_True, the operation is a
-- fusion. If set to Standard_False, the operation
-- is a cutting one. If <LShape> (resp. <LTool>) is
-- empty, the whole shape (resp. tool) is used.
--
-- The Perform process stops just before constructing
-- any result in order to authorize the selection of
-- parts of the tool. After a call to Perform, it is
-- possible to call BuilPartsOfTool, then
-- RemovePart/ActivatePart to select valid parts, and
-- it is necessary to call PerformResult to get any
-- result.
---C++: inline
raises ConstructionError from Standard
--- The exception is raised if <T> is a null shape.
is static;
BuildPartsOfTool(me: in out)
---Purpose: Constructs the primitive which serves as the tool for the
-- feature construction. Gives faces concerned by the
-- construction and builds by performing one of the
-- Boolean operations on the two intersecting shapes.
-- Raises NotDone from StdFail if no call to Perform has been done.
---C++: inline
raises NotDone from StdFail
is static;
PartsOfTool(me)
---Purpose: Returns the list of the parts of tool. Each of
-- these parts is a TopoDS_Shell.
-- Raises NotDone if no call to BuildPartsOfTool has been done.
returns ListOfShape from TopTools
---C++: return const&
---C++: inline
raises NotDone from StdFail
is static;
RemovePart(me: in out; S: Shape from TopoDS)
---Purpose: Removes <S> from the list of valid parts of tool.
-- Raises NotDone if no call to BuildPartsOfTool has
-- been done.
---C++: inline
raises NotDone from StdFail
is static;
ActivatePart(me: in out; S: Shape from TopoDS)
---Purpose: By default, all tool parts are valid for the local operation.
-- This method removes <S> from the list of invalid parts of
-- tool. By default, all parts of tool are valid for
-- the local operation.
---C++: inline
raises NotDone from StdFail
-- The exception is raised if no call to BuildPartsOfTool has
-- been done.
is static;
--- Redefinition of BRepBuilderAPI_MakeShape methods
--
--
Build(me: in out)
---Purpose: Builds the resulting shape (redefined from
-- MakeShape). Invalidates the given parts of tools
-- if any, and performs the result of the local
-- operation.
is redefined;
end LocalOperation;
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