org.reprap.geometry.polygons
Class RrLine

java.lang.Object
  org.reprap.geometry.polygons.RrLine

public class RrLine
extends java.lang.Object

Class to hold and manipulate parametric lines

Field Summary

private boolean	beingDestroyed Flag to prevent cyclic graphs going round forever
private Rr2Point	direction direction
private Rr2Point	origin origin

Constructor Summary

RrLine(Rr2Point a, Rr2Point b)
Line between two points

RrLine(RrLine r)
Copy constructor

Method Summary

RrLine	add(Rr2Point b) Move the origin
Rr2Point	cross_point(RrLine a) The point where another line crosses
double	cross_t(RrLine a) The parameter value where another line crosses
Rr2Point	d_2(Rr2Point p) The squared distance of a point from a line
void	destroy() Destroy me and all that I point to
Rr2Point	direction()
double	nearest(Rr2Point p) The nearest point on a line to another as a line parameter
RrLine	neg() Arithmetic
void	norm() Normalise the direction vector
RrLine	offset(double d) Offset by a distance
Rr2Point	origin()
Rr2Point	point(double t) The point at a given parameter value
double	projection(Rr2Point p) The parameter value of the point on the line closest to point p
RrLine	sub(Rr2Point b)
java.lang.String	toString() Make from an implicit half-plane

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

direction

private Rr2Point direction

direction

origin

private Rr2Point origin

origin

beingDestroyed

private boolean beingDestroyed

Flag to prevent cyclic graphs going round forever

Constructor Detail

RrLine

public RrLine(Rr2Point a,
              Rr2Point b)

Line between two points

Parameters:

a -

b -

RrLine

public RrLine(RrLine r)

Copy constructor

Parameters:

r -

Method Detail

destroy

public void destroy()

Destroy me and all that I point to

toString

public java.lang.String toString()

Make from an implicit half-plane

Overrides:

toString in class java.lang.Object

direction

public Rr2Point direction()

Returns:

Return the contents

origin

public Rr2Point origin()

point

public Rr2Point point(double t)

The point at a given parameter value

Parameters:

t -

Returns:

point at parameter value t

norm

public void norm()

Normalise the direction vector

neg

public RrLine neg()

Arithmetic

Returns:

inverted direction of this line

add

public RrLine add(Rr2Point b)

Move the origin

Parameters:

b -

Returns:

translated line by value b

sub

public RrLine sub(Rr2Point b)

Parameters:

b -

Returns:

??

offset

public RrLine offset(double d)

Offset by a distance

Parameters:

d -

Returns:

translated line by distance d

cross_t

public double cross_t(RrLine a)
               throws RrParallelLineException

The parameter value where another line crosses

Parameters:

a -

Returns:

parameter value

Throws:

rr_ParallelLineException

RrParallelLineException

cross_point

public Rr2Point cross_point(RrLine a)
                     throws RrParallelLineException

The point where another line crosses

Parameters:

a -

Returns:

crossing point

Throws:

rr_ParallelLineException

RrParallelLineException

nearest

public double nearest(Rr2Point p)

The nearest point on a line to another as a line parameter

Parameters:

p -

Returns:

nearest point on the eline

d_2

public Rr2Point d_2(Rr2Point p)

The squared distance of a point from a line

Parameters:

p -

Returns:

squared distance between point p and the line

projection

public double projection(Rr2Point p)

The parameter value of the point on the line closest to point p

Parameters:

p -

Returns: