| 7fd59977 |
1 | -- File: GeomFill_Fixed.cdl |
| 2 | -- Created: Tue Dec 9 18:33:12 1997 |
| 3 | -- Author: Philippe MANGIN |
| 4 | -- <pmn@sgi29> |
| 5 | ---Copyright: Matra Datavision 1997 |
| 6 | |
| 7 | |
| 8 | class Fixed from GeomFill |
| 9 | inherits TrihedronLaw from GeomFill |
| 10 | |
| 11 | ---Purpose: Defined an constant TrihedronLaw |
| 12 | |
| 13 | uses |
| 14 | Shape from GeomAbs, |
| 15 | Array1OfReal from TColStd, |
| 16 | Vec from gp |
| 17 | |
| 18 | raises |
| 19 | OutOfRange, ConstructionError |
| 20 | is |
| 21 | |
| 22 | Create(Tangent, Normal : Vec from gp) |
| 23 | returns Fixed from GeomFill |
| 24 | raises ConstructionError; |
| 25 | -- if <Tangent> and <Normal> are colinear |
| 26 | |
| 27 | Copy(me) |
| 28 | returns TrihedronLaw from GeomFill |
| 29 | is redefined; |
| 30 | -- |
| 31 | -- |
| 32 | --========== To compute Location and derivatives Location |
| 33 | -- |
| 34 | D0(me : mutable; |
| 35 | Param: Real; |
| 36 | Tangent : out Vec from gp; |
| 37 | Normal : out Vec from gp; |
| 38 | BiNormal : out Vec from gp) |
| 39 | ---Purpose: compute Triedrhon on curve at parameter <Param> |
| 40 | returns Boolean is redefined; |
| 41 | |
| 42 | D1(me : mutable; |
| 43 | Param: Real; |
| 44 | Tangent : out Vec from gp; |
| 45 | DTangent : out Vec from gp; |
| 46 | Normal : out Vec from gp; |
| 47 | DNormal : out Vec from gp; |
| 48 | BiNormal : out Vec from gp; |
| 49 | DBiNormal : out Vec from gp) |
| 50 | ---Purpose: compute Triedrhon and derivative Trihedron on curve |
| 51 | -- at parameter <Param> |
| 52 | -- Warning : It used only for C1 or C2 aproximation |
| 53 | returns Boolean |
| 54 | is redefined; |
| 55 | |
| 56 | D2(me : mutable; |
| 57 | Param: Real; |
| 58 | Tangent : out Vec from gp; |
| 59 | DTangent : out Vec from gp; |
| 60 | D2Tangent : out Vec from gp; |
| 61 | Normal : out Vec from gp; |
| 62 | DNormal : out Vec from gp; |
| 63 | D2Normal : out Vec from gp; |
| 64 | BiNormal : out Vec from gp; |
| 65 | DBiNormal : out Vec from gp; |
| 66 | D2BiNormal : out Vec from gp) |
| 67 | ---Purpose: compute Trihedron on curve |
| 68 | -- first and seconde derivatives. |
| 69 | -- Warning : It used only for C2 aproximation |
| 70 | returns Boolean |
| 71 | is redefined; |
| 72 | -- |
| 73 | -- =================== Management of continuity =================== |
| 74 | -- |
| 75 | NbIntervals(me; S : Shape from GeomAbs) |
| 76 | ---Purpose: Returns the number of intervals for continuity |
| 77 | -- <S>. |
| 78 | -- May be one if Continuity(me) >= <S> |
| 79 | returns Integer is redefined; |
| 80 | |
| 81 | Intervals(me; T : in out Array1OfReal from TColStd; |
| 82 | S : Shape from GeomAbs) |
| 83 | ---Purpose: Stores in <T> the parameters bounding the intervals |
| 84 | -- of continuity <S>. |
| 85 | -- |
| 86 | -- The array must provide enough room to accomodate |
| 87 | -- for the parameters. i.e. T.Length() > NbIntervals() |
| 88 | raises |
| 89 | OutOfRange from Standard |
| 90 | is redefined; |
| 91 | |
| 92 | |
| 93 | -- ===================== To help computation of Tolerance ============ |
| 94 | GetAverageLaw(me : mutable; |
| 95 | ATangent : out Vec from gp; |
| 96 | ANormal : out Vec from gp; |
| 97 | ABiNormal : out Vec from gp) |
| 98 | ---Purpose: Get average value of Tangent(t) and Normal(t) it is usfull to |
| 99 | -- make fast approximation of rational surfaces. |
| 100 | is redefined; |
| 101 | |
| 102 | -- =================== To help Particular case =============== |
| 103 | |
| 104 | IsConstant(me) |
| 105 | ---Purpose: Return True. |
| 106 | returns Boolean |
| 107 | is redefined; |
| 108 | |
| 109 | fields |
| 110 | T, N, B : Vec from gp; |
| 111 | end Fixed; |
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