rcsc::Line2D Class Reference

2d straight line class More...

#include <line_2d.h>

Public Member Functions
	Line2D (const double a, const double b, const double c)
	construct directly More...
	Line2D (const Vector2D &p1, const Vector2D &p2)
	construct from 2 points More...
	Line2D (const Vector2D &origin, const AngleDeg &linedir)
	construct from origin point + direction More...
const Line2D &	assign (const Vector2D &p1, const Vector2D &p2)
	construct from 2 points More...
const Line2D &	assign (const Vector2D &origin, const AngleDeg &linedir)
	construct from origin point + direction More...
double	a () const
	accessor More...
double	b () const
	accessor More...
double	c () const
	accessor More...
double	getX (const double y) const
	get X-coordinate correspond to 'y' More...
double	getY (const double x) const
	get Y-coordinate correspond to 'x' More...
double	dist (const Vector2D &p) const
	calculate distance from point to this line More...
double	dist2 (const Vector2D &p) const
	get squared distance from this line to point More...
bool	isParallel (const Line2D &line) const
	check if the slope of this line is same to the slope of 'line' More...
Vector2D	intersection (const Line2D &line) const
	get the intersection point with 'line' More...
Line2D	perpendicular (const Vector2D &p) const
	calc perpendicular line (SUI-SEN) More...
Vector2D	projection (const Vector2D &p) const
	calc projection point from p More...

Static Public Member Functions
static Vector2D	intersection (const Line2D &line1, const Line2D &line2)
	get the intersection point of 2 lines More...
static Line2D	angle_bisector (const Vector2D &origin, const AngleDeg &left, const AngleDeg &right)
	make angle bisector line from two angles More...
static Line2D	perpendicular_bisector (const Vector2D &p1, const Vector2D &p2)
	make perpendicular bisector line from twt points More...

Static Public Attributes
static const double	EPSILON
	tolerance threshold
static const double	ERROR_VALUE
	error value

Detailed Description

2d straight line class

Line Fomula: aX + bY + c = 0

Constructor & Destructor Documentation

Line2D() [1/3]

rcsc::Line2D::Line2D ( const double  a, const double  b, const double  c  )

inline

construct directly

Parameters

a	Line formula A, coefficient for x
b	Line formula B, coefficient for y
c	constant C

Line2D() [2/3]

rcsc::Line2D::Line2D ( const Vector2D &  p1, const Vector2D &  p2  )

inline

construct from 2 points

Parameters

p1	first point
p2	second point

Line2D() [3/3]

rcsc::Line2D::Line2D ( const Vector2D &  origin, const AngleDeg &  linedir  )

inline

construct from origin point + direction

Parameters

origin	origin point
linedir	direction from origin point

Member Function Documentation

a()

double rcsc::Line2D::a ( ) const

inline

accessor

Returns

coefficient 'A' of line formula

angle_bisector()

static Line2D rcsc::Line2D::angle_bisector ( const Vector2D &  origin, const AngleDeg &  left, const AngleDeg &  right  )

inlinestatic

make angle bisector line from two angles

Parameters

origin	origin point that is passed through by result line
left	left angle
right	right angle

Returns

line object

assign() [1/2]

const Line2D & rcsc::Line2D::assign ( const Vector2D &  origin, const AngleDeg &  linedir  )

inline

construct from origin point + direction

Parameters

origin	origin point
linedir	direction from origin point

Returns

const reference to itself

assign() [2/2]

const Line2D & rcsc::Line2D::assign ( const Vector2D &  p1, const Vector2D &  p2  )

inline

construct from 2 points

Parameters

p1	first point
p2	second point

Returns

const reference to itself

b()

double rcsc::Line2D::b ( ) const

inline

accessor

Returns

coefficient 'B' of line formula

c()

double rcsc::Line2D::c ( ) const

inline

accessor

Returns

coefficient 'C' of line formula

dist()

double rcsc::Line2D::dist ( const Vector2D &  p ) const

inline

calculate distance from point to this line

Parameters

p	considrered point

Returns

distance value

dist2()

double rcsc::Line2D::dist2 ( const Vector2D &  p ) const

inline

get squared distance from this line to point

Parameters

p	considrered point

Returns

squared distance value

getX()

double rcsc::Line2D::getX ( const double  y ) const

inline

get X-coordinate correspond to 'y'

Parameters

y	considered Y

Returns

X coordinate

getY()

double rcsc::Line2D::getY ( const double  x ) const

inline

get Y-coordinate correspond to 'x'

Parameters

x	considered X

Returns

Y coordinate

intersection() [1/2]

Vector2D rcsc::Line2D::intersection ( const Line2D &  line ) const

inline

get the intersection point with 'line'

Parameters

line	considered line

Returns

intersection point. if it does not exist, the invaidated value vector is returned.

intersection() [2/2]

static Vector2D rcsc::Line2D::intersection ( const Line2D &  line1, const Line2D &  line2  )

static

get the intersection point of 2 lines

Parameters

line1	the first line
line2	the second line

Returns

the intersection point. if no intersection, invalid vector is returned.

isParallel()

bool rcsc::Line2D::isParallel ( const Line2D &  line ) const

inline

check if the slope of this line is same to the slope of 'line'

Parameters

line	considered line

Return values

true	almost same
false	not same

perpendicular()

Line2D rcsc::Line2D::perpendicular ( const Vector2D &  p ) const

inline

calc perpendicular line (SUI-SEN)

Parameters

p	the point that perpendicular line pass through

Returns

perpendicular line

perpendicular_bisector()

static Line2D rcsc::Line2D::perpendicular_bisector ( const Vector2D &  p1, const Vector2D &  p2  )

static

make perpendicular bisector line from twt points

Parameters

p1	1st point
p2	2nd point

Returns

line object

projection()

Vector2D rcsc::Line2D::projection ( const Vector2D &  p ) const

inline

calc projection point from p

Parameters

p	base point

Returns

projection point

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

• /home/kali/rc/tools/include/rcsc/geom/line_2d.h