| 7fd59977 |
1 | -- File: GeomFill_Darboux.cdl |
| 2 | -- Created: Wed Mar 4 11:57:03 1998 |
| 3 | -- Author: Roman BORISOV |
| 4 | -- <rbv@ecolox.nnov.matra-dtv.fr> |
| 5 | ---Copyright: Matra Datavision 1998 |
| 6 | |
| 7 | |
| 8 | class Darboux from GeomFill |
| 9 | inherits TrihedronLaw from GeomFill |
| 10 | |
| 11 | ---Purpose: Defines Darboux case of Frenet Trihedron Law |
| 12 | |
| 13 | uses |
| 14 | |
| 15 | HSurface from Adaptor3d, |
| 16 | Shape from GeomAbs, |
| 17 | Array1OfReal from TColStd, |
| 18 | Vec from gp, |
| 19 | HArray1OfReal from TColStd, |
| 20 | CurveOnSurface from Adaptor3d |
| 21 | |
| 22 | raises |
| 23 | OutOfRange, ConstructionError |
| 24 | |
| 25 | is |
| 26 | Create |
| 27 | returns Darboux from GeomFill |
| 28 | raises ConstructionError; |
| 29 | |
| 30 | Copy(me) |
| 31 | returns TrihedronLaw from GeomFill |
| 32 | is redefined; |
| 33 | |
| 34 | -- |
| 35 | -- |
| 36 | --========== To compute Location and derivatives Location |
| 37 | -- |
| 38 | D0(me : mutable; |
| 39 | Param: Real; |
| 40 | Tangent : out Vec from gp; |
| 41 | Normal : out Vec from gp; |
| 42 | BiNormal : out Vec from gp) |
| 43 | ---Purpose: compute Triedrhon on curve at parameter <Param> |
| 44 | returns Boolean is redefined; |
| 45 | |
| 46 | D1(me : mutable; |
| 47 | Param: Real; |
| 48 | Tangent : out Vec from gp; |
| 49 | DTangent : out Vec from gp; |
| 50 | Normal : out Vec from gp; |
| 51 | DNormal : out Vec from gp; |
| 52 | BiNormal : out Vec from gp; |
| 53 | DBiNormal : out Vec from gp) |
| 54 | ---Purpose: compute Triedrhon and derivative Trihedron on curve |
| 55 | -- at parameter <Param> |
| 56 | -- Warning : It used only for C1 or C2 aproximation |
| 57 | returns Boolean |
| 58 | is redefined; |
| 59 | |
| 60 | D2(me : mutable; |
| 61 | Param: Real; |
| 62 | Tangent : out Vec from gp; |
| 63 | DTangent : out Vec from gp; |
| 64 | D2Tangent : out Vec from gp; |
| 65 | Normal : out Vec from gp; |
| 66 | DNormal : out Vec from gp; |
| 67 | D2Normal : out Vec from gp; |
| 68 | BiNormal : out Vec from gp; |
| 69 | DBiNormal : out Vec from gp; |
| 70 | D2BiNormal : out Vec from gp) |
| 71 | ---Purpose: compute Trihedron on curve |
| 72 | -- first and seconde derivatives. |
| 73 | -- Warning : It used only for C2 aproximation |
| 74 | returns Boolean |
| 75 | is redefined; |
| 76 | -- |
| 77 | -- =================== Management of continuity =================== |
| 78 | -- |
| 79 | NbIntervals(me; S : Shape from GeomAbs) |
| 80 | ---Purpose: Returns the number of intervals for continuity |
| 81 | -- <S>. |
| 82 | -- May be one if Continuity(me) >= <S> |
| 83 | returns Integer is redefined; |
| 84 | |
| 85 | Intervals(me; T : in out Array1OfReal from TColStd; |
| 86 | S : Shape from GeomAbs) |
| 87 | ---Purpose: Stores in <T> the parameters bounding the intervals |
| 88 | -- of continuity <S>. |
| 89 | -- |
| 90 | -- The array must provide enough room to accomodate |
| 91 | -- for the parameters. i.e. T.Length() > NbIntervals() |
| 92 | raises |
| 93 | OutOfRange from Standard |
| 94 | is redefined; |
| 95 | |
| 96 | |
| 97 | -- =================== To help computation of Tolerance =============== |
| 98 | GetAverageLaw(me : mutable; |
| 99 | ATangent : out Vec from gp; |
| 100 | ANormal : out Vec from gp; |
| 101 | ABiNormal : out Vec from gp) |
| 102 | ---Purpose: Get average value of Tangent(t) and Normal(t) it is usfull to |
| 103 | -- make fast approximation of rational surfaces. |
| 104 | is redefined; |
| 105 | |
| 106 | -- =================== To help Particular case =============== |
| 107 | |
| 108 | IsConstant(me) |
| 109 | ---Purpose: Say if the law is Constant. |
| 110 | returns Boolean |
| 111 | is redefined; |
| 112 | |
| 113 | IsOnlyBy3dCurve(me) |
| 114 | ---Purpose: Return False. |
| 115 | returns Boolean |
| 116 | is redefined; |
| 117 | |
| 118 | end Darboux; |
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