Plucker Class Reference

Plucker coordinates representing line given by points A,B. More...

#include <plucker.hh>

Collaboration diagram for Plucker:

Public Types
typedef Space< 3 >::Point	Point

Public Member Functions
	Plucker ()
	Plucker (Point a, Point b)
	Creates Plucker coordinates object for a line AB. Does NOT compute Plucker coordinates. Does set end points and computes direction vector. More...
	Plucker (Point a, const Point b, bool compute_pc)
	The same as above constructor, but can compute Pl. coordinates immediately if compute_pc. More...
	~Plucker ()
	Destructor. More...
double	scale () const
double	operator[] (const unsigned int index) const
	Returns Plucker coordinate of index. More...
double	operator* (const Plucker &b)
	Compute product of two Plucker coordinates. More...
void	clear ()
	Sets the flag computed on false. More...
bool	is_computed () const
	Return true if Plucker coordinates have been computed already. More...
arma::vec3	point (unsigned int idx) const
	Gets coordinates of point. More...
void	compute ()
	Compute Plucker coordinates and set computed to true. More...
arma::vec3	get_u_vector () const
	Gets directional vector U. More...
arma::vec3	get_ua_vector () const
	Gets cross product vector UxA. More...
arma::vec6	get_plucker_coords () const
	Gets Plucker coordinates. More...

Private Attributes
arma::vec6	coordinates_
	Plucker coordinates. More...
double	scale_
bool	computed_
	True, if Plucker coordinates are computed; false otherwise. More...
Armor::Array< double >	points_

Friends
std::ostream &	operator<< (std::ostream &os, const Plucker &p)
	Friend output operator. More...

Detailed Description

Plucker coordinates representing line given by points A,B.

Plucker class represents a line by 6 dimensional vector. After inserting a three-dimensional points A and B, which represents the line, class creates plucker coordinates of the line.

Class also can compute a product of two plucker coordinates.

Description of Plücker Coordinates: https://en.wikipedia.org/wiki/Pl%C3%BCcker_coordinates

Empty constructor is used for passing object to pointers from different places coordinates data are filled after calling method "compute" a flag "computed" is for comparison if coordinates data are filled

Definition at line 45 of file plucker.hh.

Member Typedef Documentation

Point

typedef Space<3>::Point Plucker::Point

Definition at line 54 of file plucker.hh.

Constructor & Destructor Documentation

Plucker() [1/3]

Plucker::Plucker

(

)

Default constructor. Creates empty object, cannot call compute later!

Definition at line 5 of file plucker.cc.

Plucker() [2/3]

Plucker::Plucker	(	Point	a,
		Point	b
	)

Creates Plucker coordinates object for a line AB. Does NOT compute Plucker coordinates. Does set end points and computes direction vector.

Parameters

a	- A point from AB line
b	- B point from AB line

Definition at line 13 of file plucker.cc.

Plucker() [3/3]

Plucker::Plucker	(	Point	a,
		const Point	b,
		bool	compute_pc
	)

The same as above constructor, but can compute Pl. coordinates immediately if compute_pc.

Definition at line 31 of file plucker.cc.

~Plucker()

Plucker::~Plucker ( )

inline

Destructor.

Definition at line 72 of file plucker.hh.

Member Function Documentation

clear()

void Plucker::clear ( )

inline

Sets the flag computed on false.

Definition at line 117 of file plucker.hh.

compute()

void Plucker::compute

(

)

Compute Plucker coordinates and set computed to true.

Definition at line 43 of file plucker.cc.

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get_plucker_coords()

arma::vec6 Plucker::get_plucker_coords ( ) const

inline

Gets Plucker coordinates.

Definition at line 134 of file plucker.hh.

get_u_vector()

arma::vec3 Plucker::get_u_vector ( ) const

inline

Gets directional vector U.

Definition at line 126 of file plucker.hh.

get_ua_vector()

arma::vec3 Plucker::get_ua_vector ( ) const

inline

Gets cross product vector UxA.

Definition at line 130 of file plucker.hh.

is_computed()

bool Plucker::is_computed ( ) const

inline

Return true if Plucker coordinates have been computed already.

Definition at line 120 of file plucker.hh.

operator*()

double Plucker::operator*

(

const Plucker &

b

)

Compute product of two Plucker coordinates.

Definition at line 38 of file plucker.cc.

operator[]()

double Plucker::operator[] ( const unsigned int  index ) const

inline

Returns Plucker coordinate of index.

Definition at line 113 of file plucker.hh.

point()

arma::vec3 Plucker::point ( unsigned int  idx ) const

inline

Gets coordinates of point.

Definition at line 123 of file plucker.hh.

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scale()

double Plucker::scale ( ) const

inline

Definition at line 74 of file plucker.hh.

Friends And Related Function Documentation

operator<<

std::ostream& operator<< ( std::ostream &  os, const Plucker &  p  )

friend

Friend output operator.

Member Data Documentation

computed_

bool Plucker::computed_

private

True, if Plucker coordinates are computed; false otherwise.

Definition at line 50 of file plucker.hh.

coordinates_

arma::vec6 Plucker::coordinates_

private

Plucker coordinates.

Definition at line 48 of file plucker.hh.

points_

Armor::Array<double> Plucker::points_

private

Definition at line 51 of file plucker.hh.

scale_

double Plucker::scale_

private

Definition at line 49 of file plucker.hh.

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

• /opt/flow123d/flow123d/src/intersection/plucker.hh
• /opt/flow123d/flow123d/src/intersection/plucker.cc