diva.canvas

Class AbstractFigureContainer

java.lang.Object

diva.canvas.AbstractFigure

diva.canvas.AbstractFigureContainer

All Implemented Interfaces:

CanvasComponent, Figure, FigureContainer, FigureSet, VisibleComponent, UserObjectContainer

Direct Known Subclasses:

CompositeFigure, FigureDecorator

public abstract class AbstractFigureContainer
extends AbstractFigure
implements FigureContainer

AbstractFigureContainer is an abstract class that roots the tree of figure-containing classes.

Version:

$Id$

Author:

John Reekie

Pt.AcceptedRating:

Yellow

Constructor Summary

Constructors

Constructor and Description
AbstractFigureContainer()

Method Summary

Modifier and Type	Method and Description
abstract boolean	contains(Figure f) Test if the given figure is a child of this composite.
void	decorate(Figure child, FigureDecorator decorator) Decorate a child figure, replacing the reference to the child figure with the decorator.
abstract java.util.Iterator	figures() Return an iteration of the children, in an undefined order.
abstract java.util.Iterator	figuresFromBack() Return an iteration of the children, from back to front.
abstract java.util.Iterator	figuresFromFront() Return an iteration of the children, from front to back.
abstract int	getFigureCount() Return the number of child figures in this container.
void	paint(java.awt.Graphics2D g) Paint this composite figure onto a 2D graphics object.
Figure	pick(java.awt.geom.Rectangle2D region) Given a rectangle, return the top-most descendent figure that it hits.
Figure	pick(java.awt.geom.Rectangle2D region, Filter filter) Given a rectangle, return the top-most descendent figure that it hits that is accepted by the given filter.
void	repaint(DamageRegion d) Accept notification that a repaint has occurred somewhere in the hierarchy below this container.
protected abstract void	replaceChild(Figure child, Figure replacement) Replace the first figure with the second.
void	transform(java.awt.geom.AffineTransform at) Transform this figure with the supplied transform.
void	translate(double x, double y) Translate this figure by the given distance.
void	undecorate(FigureDecorator decorator) Remove a figure from the given decorator and add it back into this container.

Methods inherited from class diva.canvas.AbstractFigure

contains, getBounds, getInteractor, getLayer, getOrigin, getParent, getShape, getToolTipText, getTransformContext, getUserObject, hit, intersects, isVisible, paint, repaint, setInteractor, setParent, setToolTipText, setUserObject, setVisible

Methods inherited from class java.lang.Object

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

Methods inherited from interface diva.canvas.FigureContainer

add, remove

Methods inherited from interface diva.canvas.VisibleComponent

isVisible, paint, setVisible

Methods inherited from interface diva.canvas.CanvasComponent

getParent, getTransformContext, repaint

Constructor Detail

AbstractFigureContainer

public AbstractFigureContainer()

Method Detail

decorate

public void decorate(Figure child,
                     FigureDecorator decorator)

Decorate a child figure, replacing the reference to the child figure with the decorator.

Specified by:

decorate in interface FigureContainer

Parameters:

child - The child figure.

decorator - The decorator.

contains

public abstract boolean contains(Figure f)

Test if the given figure is a child of this composite.

Specified by:

contains in interface FigureContainer

Specified by:

contains in interface FigureSet

Parameters:

f - The figure to be searched for

Returns:

true if the figure is contained.

figures

public abstract java.util.Iterator figures()

Return an iteration of the children, in an undefined order.

Specified by:

figures in interface FigureSet

Returns:

The iterator.

figuresFromBack

public abstract java.util.Iterator figuresFromBack()

Return an iteration of the children, from back to front. This is the order in which the children are painted.

Specified by:

figuresFromBack in interface FigureSet

Returns:

The iterator

figuresFromFront

public abstract java.util.Iterator figuresFromFront()

Return an iteration of the children, from front to back. This is the order in which events are intercepted.

Specified by:

figuresFromFront in interface FigureSet

Returns:

The iterator

getFigureCount

public abstract int getFigureCount()

Return the number of child figures in this container.

Specified by:

getFigureCount in interface FigureContainer

Returns:

The number of figures.

paint

public void paint(java.awt.Graphics2D g)

Paint this composite figure onto a 2D graphics object. If the layer is not visible, return immediately. Otherwise paint all children from back to front.

Specified by:

paint in interface VisibleComponent

Specified by:

paint in class AbstractFigure

Parameters:

g - The 2D graphics object that this object it to be painted upon.

pick

public Figure pick(java.awt.geom.Rectangle2D region)

Given a rectangle, return the top-most descendent figure that it hits. If none does, return null.

Specified by:

pick in interface FigureContainer

Parameters:

region - The rectangle

Returns:

The figure

pick

public Figure pick(java.awt.geom.Rectangle2D region,
                   Filter filter)

Given a rectangle, return the top-most descendent figure that it hits that is accepted by the given filter. If none does, return null.

Specified by:

pick in interface FigureContainer

Parameters:

region - The rectangle

filter - The filter

Returns:

the Figure or null.

repaint

public void repaint(DamageRegion d)

Accept notification that a repaint has occurred somewhere in the hierarchy below this container. This default implementation simply forwards the notification to its parent.

Specified by:

repaint in interface CanvasComponent

Overrides:

repaint in class AbstractFigure

Parameters:

d - The region where a repaint has occurred.

replaceChild

protected abstract void replaceChild(Figure child,
                                     Figure replacement)

Replace the first figure with the second. This is a hook method for the decorate() and undecorate() methods, and should not be called by other methods. Implementors can assume that the first figure is a child of this container, and that the second is not.

Parameters:

child - The figure to be replaced.

replacement - The replacement figure.

transform

public void transform(java.awt.geom.AffineTransform at)

Transform this figure with the supplied transform. This default implementation simply forwards the transform call to each child.

Specified by:

transform in interface Figure

Specified by:

transform in class AbstractFigure

Parameters:

at - The transform to be used.

translate

public void translate(double x,
                      double y)

Translate this figure by the given distance. This default implementation simply forwards the translate call to each child.

Specified by:

translate in interface Figure

Overrides:

translate in class AbstractFigure

Parameters:

x - The x value to be moved.

y - The y value to be moved.

undecorate

public void undecorate(FigureDecorator decorator)

Remove a figure from the given decorator and add it back into this container.

Specified by:

undecorate in interface FigureContainer

Parameters:

decorator - The decorator