Go::LiftCurve Class Reference
['geometry' - a spline library]

This class represents a "lift curve", generated from taking a surface and a 2D curve and then evaluation the surface at the parameter values obtained by evaluating the 2D curve. More...

#include <LiftCurve.h>

Inheritance diagram for Go::LiftCurve:

List of all members.

Public Member Functions
	LiftCurve (boost::shared_ptr< Go::SplineCurve > &parameter_crv, boost::shared_ptr< Go::SplineSurface > &surf, double epsgeo)
	Constructor, taking a 2D parameter curve and a surface.
virtual	~LiftCurve ()
	virtual destructor enables safe inheritance
virtual Point	eval (double t) const
	Evaluate a point on the curve for a given parameter.
virtual void	eval (double t, int n, Point der[]) const
	Evaluate a point and a certain number of derivatives on the curve for a given parameter.
virtual double	start () const
	Get the start parameter of the curve.
virtual double	end () const
	Get the end parameter of the curve.
virtual int	dim () const
	Dimension of the lifted curve (i.e. 3).
virtual bool	approximationOK (double par, Point approxpos, double tol1, double tol2) const
	Inherited from EvalCurve::approximationOK().

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Detailed Description

This class represents a "lift curve", generated from taking a surface and a 2D curve and then evaluation the surface at the parameter values obtained by evaluating the 2D curve.

Definition at line 55 of file LiftCurve.h.

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Constructor & Destructor Documentation

Go::LiftCurve::LiftCurve	(	boost::shared_ptr< Go::SplineCurve > &	parameter_crv,
		boost::shared_ptr< Go::SplineSurface > &	surf,
		double	epsgeo
	)

Constructor, taking a 2D parameter curve and a surface.

Parameters:

	parameter_crv	the 2D parameter curve that will be 'lifted'
	surf	the surface on which the resulting, 'lifted' curve will lie
	epsgeo	geometrical tolerance used when running the 'approximationOK' function.

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Member Function Documentation

virtual Point Go::LiftCurve::eval

(

double

t

)

const [virtual]

Evaluate a point on the curve for a given parameter.

Parameters:

t

the parameter for which to evaluate the curve.

Returns:

the evaluated point

Implements Go::EvalCurve.

virtual void Go::LiftCurve::eval	(	double	t,
		int	n,
		Point	der[]
	)			const [virtual]

Evaluate a point and a certain number of derivatives on the curve for a given parameter.

Parameters:

	t	the parameter for which to evaluate the curve.
	n	the number of derivatives (0 or more)

Return values:

der

pointer to an array of Points where the result will be written. The position will be stored first, then the first derivative (tangent), then the second, etc.. NB: For most (all) derived classes of 'EvalCurve', the implementation actually only supports the computation of one derivative, i.e. if n > 1, only one derivative will be computed anyway.

Implements Go::EvalCurve.

virtual double Go::LiftCurve::start

(

)

const [virtual]

Get the start parameter of the curve.

Returns:

the start parameter of the curve.

Implements Go::EvalCurve.

virtual double Go::LiftCurve::end

(

)

const [virtual]

Get the end parameter of the curve.

Returns:

the end parameter of the curve.

Implements Go::EvalCurve.

virtual bool Go::LiftCurve::approximationOK	(	double	par,
		Point	approxpos,
		double	tol1,
		double	tol2
	)			const [virtual]

Inherited from EvalCurve::approximationOK().

Parameters:

	par	the parameter at which to check the curve
	approxpos	the position we want to check whether or not the curve approximates for parameter 'par'.
	tol1	unused
	tol2	unused

Returns:

'true' if the curve approximates the point at the parameter (within the tolerance given in the constructor, 'epsgeo'). 'false' otherwise.

Implements Go::EvalCurve.

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The documentation for this class was generated from the following file:

• LiftCurve.h

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