jdsl.geomobj.api
Interface Ray2D

All Superinterfaces:

Curve2D, GeomObject, GeomObject2D, LinearCurve2D, OpenCurve2D

All Known Implementing Classes:

IntRay2D, RatRay2D, RealRay2D

public interface Ray2D

extends LinearCurve2D

This interface describes a two-dimensional ray. It only provides methods that return the source of the ray and its supporting line. Geometric tests should be performed through methods of GeomTester2D.

Version:

$Id: Ray2D.java,v 1.2 2000/03/13 19:39:11 lv Exp $

Author:

Luca Vismara (lv)

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

GeomObject2D.NoneGeomObject2D

Fields inherited from interface jdsl.geomobj.api.GeomObject2D

NONE

Method Summary

boolean	isDownward()
boolean	isLeftward()
boolean	isRightward()
boolean	isUpward()
Point2D	other()
Point2D	source()
Line2D	supportingLine()

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

Method Detail

source

public Point2D source()

Returns:

the source point of this

other

public Point2D other()

Returns:

the non-source point of this

isDownward

public boolean isDownward()

Returns:

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

isUpward

public boolean isUpward()

Returns:

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

isLeftward

public boolean isLeftward()

Returns:

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

isRightward

public boolean isRightward()

Returns:

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

supportingLine

public Line2D supportingLine()

Returns:

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