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-- File: GeomFill_Fixed.cdl
-- Created: Tue Dec 9 18:33:12 1997
-- Author: Philippe MANGIN
-- <pmn@sgi29>
---Copyright: Matra Datavision 1997
class Fixed from GeomFill
inherits TrihedronLaw from GeomFill
---Purpose: Defined an constant TrihedronLaw
uses
Shape from GeomAbs,
Array1OfReal from TColStd,
Vec from gp
raises
OutOfRange, ConstructionError
is
Create(Tangent, Normal : Vec from gp)
returns Fixed from GeomFill
raises ConstructionError;
-- if <Tangent> and <Normal> are colinear
Copy(me)
returns TrihedronLaw from GeomFill
is redefined;
--
--
--========== To compute Location and derivatives Location
--
D0(me : mutable;
Param: Real;
Tangent : out Vec from gp;
Normal : out Vec from gp;
BiNormal : out Vec from gp)
---Purpose: compute Triedrhon on curve at parameter <Param>
returns Boolean is redefined;
D1(me : mutable;
Param: Real;
Tangent : out Vec from gp;
DTangent : out Vec from gp;
Normal : out Vec from gp;
DNormal : out Vec from gp;
BiNormal : out Vec from gp;
DBiNormal : out Vec from gp)
---Purpose: compute Triedrhon and derivative Trihedron on curve
-- at parameter <Param>
-- Warning : It used only for C1 or C2 aproximation
returns Boolean
is redefined;
D2(me : mutable;
Param: Real;
Tangent : out Vec from gp;
DTangent : out Vec from gp;
D2Tangent : out Vec from gp;
Normal : out Vec from gp;
DNormal : out Vec from gp;
D2Normal : out Vec from gp;
BiNormal : out Vec from gp;
DBiNormal : out Vec from gp;
D2BiNormal : out Vec from gp)
---Purpose: compute Trihedron on curve
-- first and seconde derivatives.
-- Warning : It used only for C2 aproximation
returns Boolean
is redefined;
--
-- =================== Management of continuity ===================
--
NbIntervals(me; S : Shape from GeomAbs)
---Purpose: Returns the number of intervals for continuity
-- <S>.
-- May be one if Continuity(me) >= <S>
returns Integer is redefined;
Intervals(me; T : in out Array1OfReal from TColStd;
S : Shape from GeomAbs)
---Purpose: Stores in <T> the parameters bounding the intervals
-- of continuity <S>.
--
-- The array must provide enough room to accomodate
-- for the parameters. i.e. T.Length() > NbIntervals()
raises
OutOfRange from Standard
is redefined;
-- ===================== To help computation of Tolerance ============
GetAverageLaw(me : mutable;
ATangent : out Vec from gp;
ANormal : out Vec from gp;
ABiNormal : out Vec from gp)
---Purpose: Get average value of Tangent(t) and Normal(t) it is usfull to
-- make fast approximation of rational surfaces.
is redefined;
-- =================== To help Particular case ===============
IsConstant(me)
---Purpose: Return True.
returns Boolean
is redefined;
fields
T, N, B : Vec from gp;
end Fixed;
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