0024624: Lost word in license statement in source files
[occt.git] / src / BRepOffsetAPI / BRepOffsetAPI_MakeOffsetShape.cdl
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b311480e 1-- Created on: 1996-02-13
2-- Created by: Yves FRICAUD
3-- Copyright (c) 1996-1999 Matra Datavision
973c2be1 4-- Copyright (c) 1999-2014 OPEN CASCADE SAS
b311480e 5--
973c2be1 6-- This file is part of Open CASCADE Technology software library.
b311480e 7--
d5f74e42 8-- This library is free software; you can redistribute it and/or modify it under
9-- the terms of the GNU Lesser General Public License version 2.1 as published
973c2be1 10-- by the Free Software Foundation, with special exception defined in the file
11-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
12-- distribution for complete text of the license and disclaimer of any warranty.
b311480e 13--
973c2be1 14-- Alternatively, this file may be used under the terms of Open CASCADE
15-- commercial license or contractual agreement.
7fd59977 16
17-- Modified by skv - Tue Mar 15 16:17:37 2005
18-- Add methods for supporting history.
19
20class MakeOffsetShape from BRepOffsetAPI inherits MakeShape from BRepBuilderAPI
21
22 ---Purpose: Describes functions to build a shell out of a shape. The
23 -- result is an unlooped shape parallel to the source shape.
24 -- A MakeOffsetShape object provides a framework for:
25 -- - defining the construction of a shell
26 -- - implementing the construction algorithm
27 -- - consulting the result.
28
29uses
30 MakeOffset from BRepOffset,
31 Mode from BRepOffset,
32 Shape from TopoDS,
33 Face from TopoDS,
34 Edge from TopoDS,
35 Vertex from TopoDS,
36 ListOfShape from TopTools,
37 JoinType from GeomAbs
38
39is
40
41 Create returns MakeOffsetShape from BRepOffsetAPI;
42
43 Create ( S : Shape from TopoDS;
44 Offset : Real from Standard;
45 Tol : Real from Standard;
46 Mode : Mode from BRepOffset = BRepOffset_Skin;
47 Intersection : Boolean from Standard = Standard_False;
48 SelfInter : Boolean from Standard = Standard_False;
49 Join : JoinType from GeomAbs = GeomAbs_Arc)
50 ---Purpose: Constructs a shape parallel to the shape S, where
51 -- - S may be a face, a shell, a solid or a compound of these shape kinds;
52 -- - Offset is the offset value. The offset shape is constructed:
53 -- - outside S, if Offset is positive,
54 -- - inside S, if Offset is negative;
55 -- - Tol defines the coincidence tolerance criterion for generated shapes;
56 -- - Mode defines the construction type of parallels
57 -- applied to the free edges of shape S; currently, only one
58 -- construction type is implemented, namely the one where the free
59 -- edges do not generate parallels; this corresponds to the default
60 -- value BRepOffset_Skin;
61 -- - Intersection specifies how the algorithm must work in
62 -- order to limit the parallels to two adjacent shapes:
63 -- - if Intersection is false (default value), the intersection
64 -- is calculated with the parallels to the two adjacent shapes,
65 -- - if Intersection is true, the intersection is calculated by
66 -- taking all generated parallels into account; this computation method is
67 -- more general as it avoids some self-intersections generated in the
68 -- offset shape from features of small dimensions on shape S, however this
69 -- method has not been completely implemented and therefore is not
70 -- recommended for use;
71 -- - SelfInter tells the algorithm whether a computation
72 -- to eliminate self-intersections must be applied to the resulting
73 -- shape; however, as this functionality is not yet
74 -- implemented, it is recommended to use the default value (false);
75 -- - Join defines how to fill the holes that may appear between
76 -- parallels to the two adjacent faces. It may take values
77 -- GeomAbs_Arc or GeomAbs_Intersection:
78 -- - if Join is equal to GeomAbs_Arc, then pipes are generated
79 -- between two free edges of two adjacent parallels,
80 -- and spheres are generated on "images" of vertices;
81 -- it is the default value,
82 -- - if Join is equal to GeomAbs_Intersection, then the parallels to the
83 -- two adjacent faces are enlarged and intersected,
84 -- so that there are no free edges on parallels to faces.
85 -- Warnings
86 -- 1. All the faces of the shape S should be based on the surfaces
87 -- with continuity at least C1.
88 -- 2. The offset value should be sufficiently small to avoid
89 -- self-intersections in resulting shape. Otherwise these
90 -- self-intersections may appear inside an offset face if its
91 -- initial surface is not plane or sphere or cylinder, also some
92 -- non-adjacent offset faces may intersect each other. Also, some
93 -- offset surfaces may "turn inside out".
94 -- 3. The algorithm may fail if the shape S contains vertices where
95 -- more than 3 edges converge.
96 -- 4. Since 3d-offset algorithm involves intersection of surfaces,
97 -- it is under limitations of surface intersection algorithm.
98 -- 5. A result cannot be generated if the underlying geometry of S is
99 -- BSpline with continuity C0.
100 -- Exceptions
101 -- Geom_UndefinedDerivative if the underlying
102 -- geometry of S is BSpline with continuity C0.
103 returns MakeOffsetShape from BRepOffsetAPI;
104
105 MakeOffset (me) returns MakeOffset from BRepOffset
106 ---C++: return const &
107 ---Level: Advanced
108 is virtual;
109
110 Build (me : in out)
111 ---Purpose: Builds the resulting shape (redefined from MakeShape).
112 ---Level: Public
113 is redefined;
114
115
116 Generated (me: in out; S : Shape from TopoDS)
117 ---Purpose: Returns the list of shapes generated from the
118 -- shape <S>.
119 ---C++: return const &
120 ---Level: Public
121 returns ListOfShape from TopTools
122 is redefined virtual;
123
124
125-- Modified by skv - Tue Mar 15 16:17:37 2005 Begin
126-- Add methods for supporting history.
127
128 GeneratedEdge (me: in out; S : Shape from TopoDS)
129 ---Purpose: Returns the list of edges generated from the shape <S>.
130 ---C++: return const &
131 ---Level: Public
132 returns ListOfShape from TopTools;
133
134
135-- Query offset join type.
136
137 GetJoinType(me)
138 ---Purpose: Returns offset join type.
139 returns JoinType from GeomAbs
140 is static;
141
142
143-- Modified by skv - Tue Mar 15 16:17:37 2005 End
144
145fields
146
147 myOffsetShape : MakeOffset from BRepOffset is protected;
148
149end MakeOffsetShape;