jdsl.geomobj.ref
Class RatRay2D

java.lang.Object
  |
  +--jdsl.geomobj.ref.AbstractGeomObject2D
        |
        +--jdsl.geomobj.ref.AbstractLinearCurve2D
              |
              +--jdsl.geomobj.ref.AbstractRatLinearCurve2D
                    |
                    +--jdsl.geomobj.ref.RatRay2D

All Implemented Interfaces:

Curve2D, GeomObject, GeomObject2D, LinearCurve2D, OpenCurve2D, Ray2D

public class RatRay2D

extends AbstractRatLinearCurve2D

implements Ray2D

RatRay2D is a Ray2D constructed using either two distinct integer or rational points, or an integer or rational point and an integer or rational direction.

Version:

$Id: RatRay2D.java,v 1.6 2001/04/28 10:54:22 lv Exp $

Author:

Masi Oka (mao), Luca Vismara (lv)

Inner classes inherited from class jdsl.geomobj.api.GeomObject2D

GeomObject2D.NoneGeomObject2D

Fields inherited from class jdsl.geomobj.ref.AbstractRatLinearCurve2D

dir_, p1_, p2_

Fields inherited from class jdsl.geomobj.ref.AbstractLinearCurve2D

bottom_, INFINITE, left_, NEGATIVE, POSITIVE, right_, slope_, top_, ZERO

Fields inherited from class jdsl.geomobj.ref.AbstractGeomObject2D

gt, jn

Fields inherited from interface jdsl.geomobj.api.GeomObject2D

NONE

Constructor Summary

RatRay2D(Point2D source, Direction2D dir)
Creates a ray emanating from point source with direction dir.

RatRay2D(Point2D source, Point2D other)
Creates a ray emanating from point source and passing through point other; the underlying direction is from source to other.

Method Summary

boolean	equals(java.lang.Object obj)
boolean	isDownward()
boolean	isLeftward()
boolean	isRightward()
boolean	isUpward()
Point2D	other()
Point2D	source()
Line2D	supportingLine()

Methods inherited from class jdsl.geomobj.ref.AbstractRatLinearCurve2D

arithmeticType, direction, points

Methods inherited from class jdsl.geomobj.ref.AbstractLinearCurve2D

isDecreasing, isHorizontal, isIncreasing, isVertical, toString

Methods inherited from class jdsl.geomobj.ref.AbstractGeomObject2D

dim

Methods inherited from class java.lang.Object

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

Methods inherited from interface jdsl.geomobj.api.LinearCurve2D

direction, isDecreasing, isHorizontal, isIncreasing, isVertical

Methods inherited from interface jdsl.geomobj.api.OpenCurve2D

points

Methods inherited from interface jdsl.geomobj.api.GeomObject

arithmeticType, dim

Constructor Detail

RatRay2D

public RatRay2D(Point2D source,
                Direction2D dir)
         throws InvalidPointException,
                InvalidDirectionException

Creates a ray emanating from point source with direction dir.

Parameters:

source - the source of the ray; must be an integer or rational point

dir - the direction of the ray; must be an integer or rational direction

Throws:

InvalidPointException - if source is not an integer or rational point

InvalidDirectionException - if dir is not an integer or rational direction

RatRay2D

public RatRay2D(Point2D source,
                Point2D other)
         throws InvalidPointException

Creates a ray emanating from point source and passing through point other; the underlying direction is from source to other.

Parameters:

source - the source of the ray; must be an integer or a rational point

other - another point of the ray; must be an integer or rational point distinct from source

Throws:

InvalidPointException - if source and other are not integer or rational points, or if they are coincident

Method Detail

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

source

public Point2D source()

Specified by:

source in interface Ray2D

Following copied from interface: jdsl.geomobj.api.Ray2D

Returns:

the source point of this

other

public Point2D other()

Specified by:

other in interface Ray2D

Following copied from interface: jdsl.geomobj.api.Ray2D

Returns:

the non-source point of this

isDownward

public boolean isDownward()

Specified by:

isDownward in interface Ray2D

Following copied from interface: jdsl.geomobj.api.Ray2D

Returns:

whether this is directed downward, i.e., whether the source point is the topmost point of this

isUpward

public boolean isUpward()

Specified by:

isUpward in interface Ray2D

Following copied from interface: jdsl.geomobj.api.Ray2D

Returns:

whether this is directed upward, i.e., whether the source point is the bottommost point of this

isLeftward

public boolean isLeftward()

Specified by:

isLeftward in interface Ray2D

Following copied from interface: jdsl.geomobj.api.Ray2D

Returns:

whether this is directed leftward, i.e., whether the source point is the rightmost point of this

isRightward

public boolean isRightward()

Specified by:

isRightward in interface Ray2D

Following copied from interface: jdsl.geomobj.api.Ray2D

Returns:

whether this is directed rightward, i.e., whether the source point is the leftmost point of this

supportingLine

public Line2D supportingLine()

Specified by:

supportingLine in interface Ray2D

Following copied from interface: jdsl.geomobj.api.Ray2D

Returns:

the line passing through the source point and with the same direction of this