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-- File: AbscissaPoint.cdl
-- Created: Wed Mar 25 13:17:28 1992
-- Author: Herve LEGRAND
-- <hl@topsn3>
---Copyright: Matra Datavision 1992
class AbscissaPoint from GCPnts
---Purpose: Provides an algorithm to compute a point on a curve
-- situated at a given distance from another point on the
-- curve, the distance being measured along the curve
-- (curvilinear abscissa on the curve).
-- This algorithm is also used to compute the length of a curve.
-- An AbscissaPoint object provides a framework for:
-- - defining the point to compute
-- - implementing the construction algorithm
-- - consulting the result.
uses
Curve from Adaptor3d,
Curve2d from Adaptor2d,
AbscissaPoint from CPnts
raises NotDone from StdFail,
ConstructionError from Standard
is
Length(myclass; C : in out Curve from Adaptor3d) returns Real;
---Purpose: Computes the length of the Curve <C>.
Length(myclass; C : in out Curve2d from Adaptor2d) returns Real;
---Purpose: Computes the length of the Curve <C>.
Length(myclass; C : in out Curve from Adaptor3d; Tol : Real) returns Real;
---Purpose: Computes the length of the Curve <C> with the given tolerance.
Length(myclass; C : in out Curve2d from Adaptor2d; Tol : Real) returns Real;
---Purpose: Computes the length of the Curve <C> with the given tolerance.
Length(myclass; C : in out Curve from Adaptor3d; U1, U2 : Real) returns Real;
---Purpose: Computes the length of the Curve <C>.
Length(myclass; C : in out Curve2d from Adaptor2d; U1, U2 : Real) returns Real;
---Purpose: Computes the length of the Curve <C>.
Length(myclass; C : in out Curve from Adaptor3d; U1, U2, Tol : Real) returns Real;
---Purpose: Computes the length of the Curve <C> with the given tolerance.
Length(myclass; C : in out Curve2d from Adaptor2d; U1, U2, Tol : Real) returns Real;
---Purpose: Computes the length of the Curve <C> with the given tolerance.
Create
---Purpose: Constructs an empty algorithm. This function is used
-- only for initializing a framework to compute the length
-- of a curve (or a series of curves).
-- Warning
-- The function IsDone will return the value false after the use of this function.
returns AbscissaPoint from GCPnts ;
Create (C : in out Curve from Adaptor3d; Abscissa, U0 : Real)
---Purpose: the algorithm computes a point on a curve <Curve> at the
-- distance <Abscissa> from the point of parameter <U0>.
returns AbscissaPoint from GCPnts
raises ConstructionError;
-- raised when it is not possible to compute the curve's length or if
-- the curve is null;
Create (Tol: Real; C : in out Curve from Adaptor3d; Abscissa, U0 : Real)
---Purpose: the algorithm computes a point on a curve <Curve> at
-- the distance <Abscissa> from the point of parameter
-- <U0> with the given tolerance.
returns AbscissaPoint from GCPnts
raises ConstructionError;
-- raised when it is not possible to compute the curve's length or if
-- the curve is null;
Create (Tol: Real; C : in out Curve2d from Adaptor2d; Abscissa, U0 : Real)
---Purpose: the algorithm computes a point on a curve <Curve> at
-- the distance <Abscissa> from the point of parameter
-- <U0> with the given tolerance.
returns AbscissaPoint from GCPnts
raises ConstructionError;
-- raised when it is not possible to compute the curve's length or if
-- the curve is null;
Create (C : in out Curve2d from Adaptor2d; Abscissa, U0 : Real)
---Purpose: the algorithm computes a point on a curve <Curve> at the
-- distance <Abscissa> from the point of parameter <U0>.
returns AbscissaPoint from GCPnts
raises ConstructionError;
-- raised when it is not possible to compute the curve's length or if
-- the curve is null;
Create (C : in out Curve from Adaptor3d; Abscissa, U0, Ui : Real)
---Purpose: the algorithm computes a point on a curve <Curve> at the
-- distance <Abscissa> from the point of parameter <U0>.
-- <Ui> is the starting value used in the iterative process
-- which find the solution, it must be close to the final
-- solution
returns AbscissaPoint from GCPnts
raises ConstructionError;
-- raised when it is not possible to compute the curve's length or if
-- the curve is null;
Create (C : in out Curve2d from Adaptor2d; Abscissa, U0, Ui : Real)
---Purpose: the algorithm computes a point on a curve <Curve> at the
-- distance <Abscissa> from the point of parameter <U0>.
-- <Ui> is the starting value used in the iterative process
-- which find the solution, it must be closed to the final
-- solution
returns AbscissaPoint from GCPnts
raises ConstructionError;
-- raised when it is not possible to compute the curve's length or if
-- the curve is null;
Create (C : in out Curve from Adaptor3d; Abscissa, U0, Ui, Tol : Real)
---Purpose: the algorithm computes a point on a curve <Curve> at the
-- distance <Abscissa> from the point of parameter <U0>.
-- <Ui> is the starting value used in the iterative process
-- which find the solution, it must be close to the final
-- solution
returns AbscissaPoint from GCPnts
raises ConstructionError;
-- raised when it is not possible to compute the curve's length or if
-- the curve is null;
Create (C : in out Curve2d from Adaptor2d; Abscissa, U0, Ui, Tol : Real)
---Purpose: the algorithm computes a point on a curve <Curve> at the
-- distance <Abscissa> from the point of parameter <U0>.
-- <Ui> is the starting value used in the iterative process
-- which find the solution, it must be close to the final
-- solution
returns AbscissaPoint from GCPnts
raises ConstructionError;
-- raised when it is not possible to compute the curve's length or if
-- the curve is null;
IsDone(me)
---Purpose: True if the computation was successful, False otherwise.
-- IsDone is a protection against:
-- - non-convergence of the algorithm
-- - querying the results before computation.
---C++: inline
returns Boolean
is static;
Parameter(me) returns Real
---Purpose: Returns the parameter on the curve of the point
-- solution of this algorithm.
-- Exceptions
-- StdFail_NotDone if the computation was not
-- successful, or was not done.
---C++: inline
raises NotDone from StdFail
is static;
fields
myComputer : AbscissaPoint from CPnts;
end AbscissaPoint;
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