Class LineSegment2D

Defined in File linesegment2d.hpp

Inheritance Relationships

Base Type

public tuw::Line2D (Class Line2D)

Derived Type

public tuw::LineSegment2DDetector::LineSegment (Class LineSegment2DDetector::LineSegment)

Class Documentation

class LineSegment2D : public tuw::Line2D 

class to represent a 2D line with its endpoints and as equation a*x + b*y + c = 0

Subclassed by tuw::LineSegment2DDetector::LineSegment

Public Functions

LineSegment2D()

the lines endpoints

constructor

LineSegment2D(const LineSegment2D &l)

copy constructor

Parameters:: l – LineSegment2D

LineSegment2D(const Point2D &p0, const Point2D &p1)

constructor to create a line from points

Parameters:

p0 –
p1 –

LineSegment2D(const double &x0, const double &y0, const double &x1, const double &y1)

constructor to create a line from points

Parameters:

x0 –
y0 –
x1 –
y1 –

const double &x0() const

Returns:: startpoint x

const double &y0() const

Returns:: startpoint y

const double &x1() const

Returns:: endpoint x

const double &y1() const

Returns:: endpoint y

double angle() const: orientation of the line in space @retun angle between -PI and PI

const Point2D &p0() const

Returns:: startpoint

const Point2D &p1() const

Returns:: endpoint

Point2D pc() const

Returns:: center point between p0 and p1

const Line2D &line() const

Returns:: the line function of the base class

double length() const

Returns:: length of the line

bool operator==(const LineSegment2D &o) const

comparison operator

Returns:: true on equal
Returns:: true on equal

LineSegment2D &set(const double &x0, const double &y0, const double &x1, const double &y1)

sets a line from points

Parameters:

x0 –
y0 –
x1 –
y1 –

LineSegment2D &set(const Point2D &p0, const Point2D &p1)

sets a line from points

Parameters:

p0 –
p1 –

double distanceTo(const Point2D &p, double &dx, double &dy) const

computes distance to line segment

Parameters:

p – point
dx – vector to point x
dx – vector to point y

Returns:

distance to line between the segment endpoints or the distance to the nearest endpoints

double distanceSqrTo(const Point2D &p, double &dx, double &dy) const

computes distance to line segment

computes squared distance to line segment

Parameters:

p – point
dx – vector to point x
dx – vector to point y
p – point
dx – vector to point x
dx – vector to point y

Returns:

distance to line between the segment endpoints or the distance to the nearest endpoints

Returns:

distance to line between the segment endpoints or the distance to the nearest endpoints

double closestPointLineSegmentRatio(const Point2D &p) const

Point2D closestPointTo(const Point2D &p) const

computes closest point along segment

Parameters:: p – point
Returns:: closest point along segment to the given point

double distanceTo(const Point2D &p) const

computes distance to line segment

Parameters:: p – point
Returns:: distance to line between the segment endpoints or the distance to the nearest endpoints
Returns:: distance to line between the segment endpoints or the distance to the nearest endpoints

Protected Attributes

Point2D p0_

Point2D p1_

Friends

inline friend std::ostream &operator<<(std::ostream &os, const LineSegment2D &o)