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-- File: GeomFill_DraftTrihedron.cdl
-- Created: Tue Apr 14 09:48:24 1998
-- Author: Stephanie HUMEAU
-- <shu@sun17>
---Copyright: Matra Datavision 1998
----------------------------------------------------
-- Triedre de Frenet pour une surface de depouille
----------------------------------------------------
class DraftTrihedron from GeomFill
inherits TrihedronLaw from GeomFill
uses
Shape from GeomAbs,
Array1OfReal from TColStd,
Vec from gp
raises
OutOfRange, ConstructionError
is
Create (BiNormal : Vec from gp;
Angle : Real )
returns DraftTrihedron from GeomFill;
SetAngle(me : mutable; Angle : Real)
is static;
Copy(me) returns TrihedronLaw from GeomFill
is redefined;
D0( me : mutable;
Param : Real;
Tangent : out Vec from gp;
Normal : out Vec from gp;
BiNormal : out Vec from gp)
returns Boolean is redefined;
---Purpose: compute Triedrhon and derivative Trihedron on curve at
-- parameter <Param>
-- Warning : It used only for C1 or C2 aproximation
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)
returns Boolean is redefined;
---Purpose: compute Trihedron on curve
-- first and seconde derivatives.
-- Warning : It used only for C2 aproximation
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)
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 usefull to
-- make fast approximation of rational surfaces.
is redefined;
-- =================== To help Particular case ===============
IsConstant(me)
---Purpose: Say if the law is Constant.
returns Boolean
is redefined;
IsOnlyBy3dCurve(me)
---Purpose: Return True.
returns Boolean
is redefined;
fields
B : Vec from gp;
myAngle : Real from Standard;
myCos : Real;
end DraftTrihedron;
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