com.rolemodelsoft.drawlet.basics
Class EdgeLocator

java.lang.Object
  |
  +--com.rolemodelsoft.drawlet.basics.AbstractLocator
        |
        +--com.rolemodelsoft.drawlet.basics.EdgeLocator

public class EdgeLocator

extends AbstractLocator

implements RelativeLocator

This class implements Locator by providing x and y coordinates that are at the intersection of the figure and the line defined by the 2 locators.

See Also:

Serialized Form

Field Summary

protected int	endX
protected int	endY
protected Figure	figure The figure to which the line is connected.
protected Locator	inside The locator that is assumed to be inside a figure.
protected Locator	outside The locator that is assumed to be outside a figure.
protected int	startX
protected int	startY
protected int	x
protected int	y

Constructor Summary

EdgeLocator(Locator inside, Locator outside)
Creates a new EdgeLocator initialized with the given values.

Method Summary

protected void	computeIntersection()
protected void	computeMiddlePoint(int startX, int startY, int endX, int endY)
protected boolean	differenceIsOneOrNone(int x, int y)
static Figure	figureFromLocator(Locator aLocator) Answer the figure, if any, associated with the locator.
Locator	getBase() Answer the base concrete locator of the receiver.
int	x() Answer the x coordinate.
int	y() Answer the y coordinate.

Methods inherited from class com.rolemodelsoft.drawlet.basics.AbstractLocator

duplicate, duplicateIn, postDuplicate, r, theta, toString

Methods inherited from class java.lang.Object

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

Field Detail

inside

protected Locator inside

The locator that is assumed to be inside a figure.

figure

protected Figure figure

The figure to which the line is connected.

outside

protected Locator outside

The locator that is assumed to be outside a figure.

x

protected int x

y

protected int y

startX

protected int startX

startY

protected int startY

endX

protected int endX

endY

protected int endY

Constructor Detail

EdgeLocator

public EdgeLocator(Locator inside,
                   Locator outside)

Creates a new EdgeLocator initialized with the given values.

Parameters:

inside - a Locator representing the end of a line inside a figure.

outside - a Locator representing the end of a line outside a figure.

figure - the figure at the inside Locator.

Method Detail

computeIntersection

protected void computeIntersection()

computeMiddlePoint

protected void computeMiddlePoint(int startX,
                                  int startY,
                                  int endX,
                                  int endY)

Returns:

com.rolemodelsoft.drawlet.basics.DrawingPoint

differenceIsOneOrNone

protected boolean differenceIsOneOrNone(int x,
                                        int y)

figureFromLocator

public static Figure figureFromLocator(Locator aLocator)

Answer the figure, if any, associated with the locator. This can be a useful utility to determine whether or not a particular locator is tied to some figure.

Parameters:

aLocator - the Locator to mine for figures

Returns:

the Figure associated with the locator, or null if none

getBase

public Locator getBase()

Answer the base concrete locator of the receiver.

Specified by:

getBase in interface RelativeLocator

Returns:

the base concrete Locator of the receiver

x

public int x()

Answer the x coordinate.

Overrides:

x in class AbstractLocator

Returns:

an integer representing the x coordinate

y

public int y()

Answer the y coordinate.

Overrides:

y in class AbstractLocator

Returns:

an integer representing the y coordinate