org.lcsim.recon.tracking.spacegeom

Class TwoSegment

java.lang.Object

org.lcsim.recon.tracking.spacegeom.TwoSegment

public class TwoSegment
extends Object

A line segment in two dimensions.

Version:

1.0

Author:

Norman A. Graf

Field Summary

Fields

Modifier and Type	Field and Description
private TwoSpacePoint	_a
private TwoSpacePoint	_b
private double	_length

Constructor Summary

Constructors

Constructor and Description
TwoSegment(TwoSpacePoint a, TwoSpacePoint b) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
TwoSpacePoint	endPoint() Fetch the ending point
static TwoSpacePoint	intersection(TwoSegment a, TwoSegment b) return intersection point of two line segments
double	length() Return the length of the segment
double	minimumDistance(TwoSpacePoint p) calculate the minimum distance between this segment and a point p
double	phi() Return the azimuthal angle of this segment, the angle from point 1 to 2 zero & 3pi/4 is vertical pi and 2pi is horizontal
TwoSpacePoint	startPoint() Fetch the starting point
String	toString() String representation of this object

Methods inherited from class java.lang.Object

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

Field Detail

_a

private TwoSpacePoint _a

_b

private TwoSpacePoint _b

_length

private double _length

Constructor Detail

TwoSegment

public TwoSegment(TwoSpacePoint a,
          TwoSpacePoint b)

Constructor

Parameters:

a - beginning TwoSpacePoint

b - ending TwoSpacePoint

Method Detail

startPoint

public TwoSpacePoint startPoint()

Fetch the starting point

Returns:

beginning TwoSpacePoint

endPoint

public TwoSpacePoint endPoint()

Fetch the ending point

Returns:

ending TwoSpacePoint

length

public double length()

Return the length of the segment

Returns:

length of the segment

phi

public double phi()

Return the azimuthal angle of this segment, the angle from point 1 to 2 zero & 3pi/4 is vertical pi and 2pi is horizontal

Returns:

the angle from point 1 to point 2

minimumDistance

public double minimumDistance(TwoSpacePoint p)

calculate the minimum distance between this segment and a point p

Parameters:

p - The TwoSpacePoint

Returns:

the distance between the point and this segment

intersection

public static TwoSpacePoint intersection(TwoSegment a,
                         TwoSegment b)

return intersection point of two line segments

Parameters:

a - The first line segment

b - The second line segment

Returns:

The intersection point of the two segments. null if lines are parallel or intersect outside of segment boundaries.

toString

public String toString()

String representation of this object

Overrides:

toString in class Object

Returns:

String representation of this object