SPApar_dir Class Reference
[Geometric Atoms]

This class defines a parametric direction vector on a surface in 2D parameter-space. More...

#include <param.hxx>

Inheritance diagram for SPApar_dir:

[legend]

Collaboration diagram for SPApar_dir:

[legend]

List of all members.

Public Member Functions
void	debug (FILE *fp=debug_file_ptr) const
	Outputs details of a parameter vector to the debug file or to the specified file.
logical	is_zero (const double tol=SPAresabs) const
	Returns TRUE if a radius function is zero everywhere, to within a given tolerance; otherwise, it returns FALSE.
double	len () const
	Returns the length of the SPApar_vec.
double	len_sq () const
	Returns (du * du + dv * dv).
SPApar_vec const &	operator*= (double d)
	Multiplies a parameter by a scalar.
SPApar_vec const &	operator+= (SPApar_vec const &v)
	Adds two parameter vectors.
SPApar_vec const &	operator-= (SPApar_vec const &v)
	Performs a binary minus operation.
SPApar_vec const &	operator/= (double d)
	Divides a parameter vector by a scalar value.
	SPApar_dir (SPApar_vec const &v)
	Constructs and normalizes a SPApar_dir from a SPApar_vec.
	SPApar_dir (double uv[2])
	Constructs and normalizes a SPApar_dir from an array of two doubles.
	SPApar_dir (double uval, double vval)
	Constructs and normalizes a SPApar_dir from two doubles.
	SPApar_dir ()
	Constructs an un-initialized SPApar_dir.
Public Attributes
SPAparameter	du
	The vector in the u-direction.
SPAparameter	dv
	The vector in the v-direction.
Friends
double	operator% (SPApar_dir const &u, SPApar_pos const &p)
	Returns the scalar product between a parameter direction and parameter position.
double	operator% (SPApar_pos const &p, SPApar_dir const &u)
	Returns the scalar product between a parameter position and parameter direction.
SPApar_dir	operator- (SPApar_dir const &)
	Performs a unary minus operation.

---

Detailed Description

This class defines a parametric direction vector on a surface in 2D parameter-space.

---

Constructor & Destructor Documentation

SPApar_dir::SPApar_dir

(

)

[inline]

Constructs an un-initialized SPApar_dir.

SPApar_dir::SPApar_dir	(	double	uval,
		double	vval
	)

Constructs and normalizes a SPApar_dir from two doubles.

Parameters:

	uval	u vector.
	vval	v vector.

SPApar_dir::SPApar_dir

(

double

uv[2]

)

Constructs and normalizes a SPApar_dir from an array of two doubles.

Parameters:

uv

array of 2 vectors.

SPApar_dir::SPApar_dir

(

SPApar_vec const &

v

)

Constructs and normalizes a SPApar_dir from a SPApar_vec.

Parameters:

v

parameter vector direction.

---

Member Function Documentation

void SPApar_vec::debug

(

FILE *

fp = debug_file_ptr

)

const [inherited]

Outputs details of a parameter vector to the debug file or to the specified file.

Parameters:

fp

file name.

logical SPApar_vec::is_zero

(

const double

tol = SPAresabs

)

const [inherited]

Returns TRUE if a radius function is zero everywhere, to within a given tolerance; otherwise, it returns FALSE.

Parameters:

tol

zero tolerance.

double SPApar_vec::len

(

)

const [inherited]

Returns the length of the SPApar_vec.

double SPApar_vec::len_sq

(

)

const [inherited]

Returns (du * du + dv * dv).

SPApar_vec const& SPApar_vec::operator*=

(

double

d

)

[inherited]

Multiplies a parameter by a scalar.

Parameters:

d

double.

SPApar_vec const& SPApar_vec::operator+=

(

SPApar_vec const &

v

)

[inherited]

Adds two parameter vectors.

Parameters:

v

parameter vector.

SPApar_vec const& SPApar_vec::operator-=

(

SPApar_vec const &

v

)

[inherited]

Performs a binary minus operation.

Parameters:

v

parameter vector.

SPApar_vec const& SPApar_vec::operator/=

(

double

d

)

[inherited]

Divides a parameter vector by a scalar value.

Parameters:

d

scalar value.

---

Friends And Related Function Documentation

double operator%	(	SPApar_dir const &	u,
		SPApar_pos const &	p
	)			[friend]

Returns the scalar product between a parameter direction and parameter position.

Parameters:

	u	parameter direction.
	p	parameter position.

double operator%	(	SPApar_pos const &	p,
		SPApar_dir const &	u
	)			[friend]

Returns the scalar product between a parameter position and parameter direction.

Parameters:

	p	parameter position.
	u	parameter direction.

SPApar_dir operator-

(

SPApar_dir const &

)

[friend]

Performs a unary minus operation.

Parameters:

u

parameter direction.

---

Member Data Documentation

SPAparameter SPApar_vec::du [inherited]

The vector in the u-direction.

SPAparameter SPApar_vec::dv [inherited]

The vector in the v-direction.