objects
Class EuHalf

java.lang.Object
  |
  +--objects.EuObject
        |
        +--objects.EuParametrized
              |
              +--objects.EuLine
                    |
                    +--objects.EuHalf

All Implemented Interfaces:

java.lang.Cloneable

public class EuHalf

extends EuLine

An instance of this class represents a half-line, represented as a line using EuLine, along with an endpoint and a direction.

Field Summary

fundamentals.EuReal

inParameter The parameter at which the half-line begins.

Fields inherited from class objects.EuLine

generator

Fields inherited from class objects.EuParametrized

anchor

Fields inherited from class objects.EuObject

infoHash, provenience, scaledown

Constructor Summary

EuHalf()
Contructor for dummy object

EuHalf(double x, double y, double deltax, double deltay, double t, int direction)
The constructor does initialization.

EuHalf(objects.EuPoint p1, objects.EuPoint p2)
The halfline is instantiated through the two given points, with p1 as endpoint

Method Summary

fundamentals.EuVector	anInnerPoint() Describe anInnerPoint method here.
fundamentals.EuVector	atEnd() Describe atEnd method here.
boolean	castIdentical(objects.EuObject other) See if passed object can be cast to the present one.
double	closestParameter(double x, double y) Find the parameter value which yields the closest point to a given one.
objects.plotCollection	computeClip(fundamentals.mouseInfo info) Compute the visible portion of the object as a collection of arcs, intervals or points.
int	getDirection() Describe getDirection method here.
boolean	interiorContains(fundamentals.EuVector point) See if passed point lies inside the half-line.
protected fundamentals.EuVector	invisibleRandomPoint(fundamentals.mouseInfo info, java.util.Random croupier) Chooses a sensible point on the half line when the half line is invisible.
boolean	isFull() Describe isFull method here.
boolean	overlaps(objects.EuObject other) See if objects overlap.
java.lang.String	params() Describe params method here.
void	passArguments(fundamentals.EuArguments args) Describe passArguments method here.
java.lang.String	toNaturalLanguage(int language, boolean determined) Describe toNaturalLanguage method here.
java.lang.String	toString() Describe toString method here.
char	typeName() Describe typeName method here.

Methods inherited from class objects.EuLine

atParameter, cloneMe, closestParameterOnLine, confusionDistance, nameDisplacementAngle, nameParameter, onSameLine, superIdentical

Methods inherited from class objects.EuParametrized

atParameter, atParameter, closestParameter, closureContains, distance, matchingPair, nameLocation, randomPoint

Methods inherited from class objects.EuObject

cloneObject, draw, equals, getClip, isVisible, mouseVicinity, mouseVicinity, toPs

Methods inherited from class java.lang.Object

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

Field Detail

inParameter

public fundamentals.EuReal inParameter

The parameter at which the half-line begins.

Constructor Detail

EuHalf

public EuHalf(double x,
              double y,
              double deltax,
              double deltay,
              double t,
              int direction)
       throws DesignException,
              UserException

The constructor does initialization. A zero generator vector or a zero sign gives a LeaRuntimeException

Parameters:

x - the first coordinate of anchor

y - the second coordinate of anchor

deltax - the first coordinate of generator

deltay - the second coordinate of generator

t - the parameter of the endpoint

direction - the direction (direction)

Throws:

DesignException - if an error occurs

UserException - if an error occurs

EuHalf

public EuHalf()

Contructor for dummy object

EuHalf

public EuHalf(objects.EuPoint p1,
              objects.EuPoint p2)
       throws UserException

The halfline is instantiated through the two given points, with p1 as endpoint

Parameters:

p1 - an EuPoint value

p2 - an EuPoint value

Throws:

UserException - if an error occurs

Method Detail

atEnd

public fundamentals.EuVector atEnd()

Describe atEnd method here.

Returns:

The point at the end of the half-line

computeClip

public objects.plotCollection computeClip(fundamentals.mouseInfo info)
                                   throws UserException

Compute the visible portion of the object as a collection of arcs, intervals or points.

Overrides:

computeClip in class EuLine

Parameters:

info - information used in scaling and positioning the object

Returns:

a plotCollection value

Throws:

UserException - if an error occurs

invisibleRandomPoint

protected fundamentals.EuVector invisibleRandomPoint(fundamentals.mouseInfo info,
                                                     java.util.Random croupier)

Chooses a sensible point on the half line when the half line is invisible.

Overrides:

invisibleRandomPoint in class EuLine

Parameters:

info - a mouseInfo value

croupier - a Random value

Returns:

an EuVector value

anInnerPoint

public fundamentals.EuVector anInnerPoint()

Describe anInnerPoint method here.

Returns:

an EuVector value

castIdentical

public boolean castIdentical(objects.EuObject other)

See if passed object can be cast to the present one.

Overrides:

castIdentical in class EuLine

Parameters:

other - an EuObject value

Returns:

true if passed object is a EuLine which is identical to this one @param other the object being compared to the present one

closestParameter

public double closestParameter(double x,
                               double y)

Find the parameter value which yields the closest point to a given one.

Overrides:

closestParameter in class EuLine

Parameters:

x - The first coordinate of the given point

y - The second coordinate of the given point

Returns:

The parameter

overlaps

public boolean overlaps(objects.EuObject other)

See if objects overlap.

Overrides:

overlaps in class EuLine

Parameters:

other - an EuObject value

Returns:

true if passed object is a EuLine, EuHalf or EuInterval which overlaps with this one @param other the object being compared to the present one

interiorContains

public boolean interiorContains(fundamentals.EuVector point)

See if passed point lies inside the half-line.

Overrides:

interiorContains in class EuParametrized

Parameters:

point - an EuVector value

Returns:

true if passed point lies on the half-line. @param point the point being compared to the present half-line

typeName

public char typeName()

Describe typeName method here.

Overrides:

typeName in class EuLine

Returns:

H

isFull

public boolean isFull()

Describe isFull method here.

Overrides:

isFull in class EuLine

Returns:

false since the item is not of subtype A_RADIUS, A_POINT, A_LINE, A_CIRCLE

getDirection

public int getDirection()

Describe getDirection method here.

Returns:

an int value

params

public java.lang.String params()

Describe params method here.

Overrides:

params in class EuLine

Returns:

A technical specification of parameters associated to the object

toString

public java.lang.String toString()

Describe toString method here.

Overrides:

toString in class EuLine

Returns:

A technical specification of the object

passArguments

public void passArguments(fundamentals.EuArguments args)

Describe passArguments method here.

Overrides:

passArguments in class EuLine

Parameters:

args - an EuArguments value

toNaturalLanguage

public java.lang.String toNaturalLanguage(int language,
                                          boolean determined)

Describe toNaturalLanguage method here.

Overrides:

toNaturalLanguage in class EuLine

Parameters:

language - an int value

determined - a boolean value

Returns:

a String value