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1 | -- Created on: 1998-03-04 |
| 2 | -- Created by: Roman BORISOV |
| 3 | -- Copyright (c) 1998-1999 Matra Datavision |
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4 | -- Copyright (c) 1999-2014 OPEN CASCADE SAS |
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5 | -- |
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6 | -- This file is part of Open CASCADE Technology software library. |
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7 | -- |
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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 |
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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. |
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13 | -- |
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14 | -- Alternatively, this file may be used under the terms of Open CASCADE |
| 15 | -- commercial license or contractual agreement. |
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16 | |
| 17 | class Darboux from GeomFill |
| 18 | inherits TrihedronLaw from GeomFill |
| 19 | |
| 20 | ---Purpose: Defines Darboux case of Frenet Trihedron Law |
| 21 | |
| 22 | uses |
| 23 | |
| 24 | HSurface from Adaptor3d, |
| 25 | Shape from GeomAbs, |
| 26 | Array1OfReal from TColStd, |
| 27 | Vec from gp, |
| 28 | HArray1OfReal from TColStd, |
| 29 | CurveOnSurface from Adaptor3d |
| 30 | |
| 31 | raises |
| 32 | OutOfRange, ConstructionError |
| 33 | |
| 34 | is |
| 35 | Create |
| 36 | returns Darboux from GeomFill |
| 37 | raises ConstructionError; |
| 38 | |
| 39 | Copy(me) |
| 40 | returns TrihedronLaw from GeomFill |
| 41 | is redefined; |
| 42 | |
| 43 | -- |
| 44 | -- |
| 45 | --========== To compute Location and derivatives Location |
| 46 | -- |
| 47 | D0(me : mutable; |
| 48 | Param: Real; |
| 49 | Tangent : out Vec from gp; |
| 50 | Normal : out Vec from gp; |
| 51 | BiNormal : out Vec from gp) |
| 52 | ---Purpose: compute Triedrhon on curve at parameter <Param> |
| 53 | returns Boolean is redefined; |
| 54 | |
| 55 | D1(me : mutable; |
| 56 | Param: Real; |
| 57 | Tangent : out Vec from gp; |
| 58 | DTangent : out Vec from gp; |
| 59 | Normal : out Vec from gp; |
| 60 | DNormal : out Vec from gp; |
| 61 | BiNormal : out Vec from gp; |
| 62 | DBiNormal : out Vec from gp) |
| 63 | ---Purpose: compute Triedrhon and derivative Trihedron on curve |
| 64 | -- at parameter <Param> |
| 65 | -- Warning : It used only for C1 or C2 aproximation |
| 66 | returns Boolean |
| 67 | is redefined; |
| 68 | |
| 69 | D2(me : mutable; |
| 70 | Param: Real; |
| 71 | Tangent : out Vec from gp; |
| 72 | DTangent : out Vec from gp; |
| 73 | D2Tangent : out Vec from gp; |
| 74 | Normal : out Vec from gp; |
| 75 | DNormal : out Vec from gp; |
| 76 | D2Normal : out Vec from gp; |
| 77 | BiNormal : out Vec from gp; |
| 78 | DBiNormal : out Vec from gp; |
| 79 | D2BiNormal : out Vec from gp) |
| 80 | ---Purpose: compute Trihedron on curve |
| 81 | -- first and seconde derivatives. |
| 82 | -- Warning : It used only for C2 aproximation |
| 83 | returns Boolean |
| 84 | is redefined; |
| 85 | -- |
| 86 | -- =================== Management of continuity =================== |
| 87 | -- |
| 88 | NbIntervals(me; S : Shape from GeomAbs) |
| 89 | ---Purpose: Returns the number of intervals for continuity |
| 90 | -- <S>. |
| 91 | -- May be one if Continuity(me) >= <S> |
| 92 | returns Integer is redefined; |
| 93 | |
| 94 | Intervals(me; T : in out Array1OfReal from TColStd; |
| 95 | S : Shape from GeomAbs) |
| 96 | ---Purpose: Stores in <T> the parameters bounding the intervals |
| 97 | -- of continuity <S>. |
| 98 | -- |
| 99 | -- The array must provide enough room to accomodate |
| 100 | -- for the parameters. i.e. T.Length() > NbIntervals() |
| 101 | raises |
| 102 | OutOfRange from Standard |
| 103 | is redefined; |
| 104 | |
| 105 | |
| 106 | -- =================== To help computation of Tolerance =============== |
| 107 | GetAverageLaw(me : mutable; |
| 108 | ATangent : out Vec from gp; |
| 109 | ANormal : out Vec from gp; |
| 110 | ABiNormal : out Vec from gp) |
| 111 | ---Purpose: Get average value of Tangent(t) and Normal(t) it is usfull to |
| 112 | -- make fast approximation of rational surfaces. |
| 113 | is redefined; |
| 114 | |
| 115 | -- =================== To help Particular case =============== |
| 116 | |
| 117 | IsConstant(me) |
| 118 | ---Purpose: Say if the law is Constant. |
| 119 | returns Boolean |
| 120 | is redefined; |
| 121 | |
| 122 | IsOnlyBy3dCurve(me) |
| 123 | ---Purpose: Return False. |
| 124 | returns Boolean |
| 125 | is redefined; |
| 126 | |
| 127 | end Darboux; |
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