edu.umd.cs.jazz.scenegraph
Class ZDummyVisualComponent

java.lang.Object
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  +--edu.umd.cs.jazz.scenegraph.ZVisualComponent
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        +--edu.umd.cs.jazz.scenegraph.ZDummyVisualComponent

public class ZDummyVisualComponent

extends ZVisualComponent

ZDummyVisualComponent is the default Visual Component to all ZNodes. It serves as a placeholder until a ZNode has a real visual component. Using ZDummyVisualComponent allows us to 'decouple` ZNodes and Visual Components because a ZNode need not check if it contains a Visual Component before performing some operation on it (i.e. pick, paint, etc). There will always be a Visual Component (even if it's only a Dummy that does nothing). Also, the ZDummyVisualComponent is a singleton type object. Do not call the constructor directly. Use the getInstance method

Field Summary

protected static ZDummyVisualComponent

instance Hang onto the one and only instance allowed to be created.

Fields inherited from class edu.umd.cs.jazz.scenegraph.ZVisualComponent

cacheVolatile, findable, findable_DEFAULT, isVolatile, localBounds, localBoundsDirty, parent, pickable, pickable_DEFAULT, selected

Constructor Summary

ZDummyVisualComponent()
Do not call this method directly.

Method Summary

void	damage() always a noop
ZNode	findNode()
java.lang.Object	getAppData() Always returns false
static ZDummyVisualComponent	getInstance() Returns the one and only ZDummyVisualComponent
ZBounds	getLocalBounds() always a noop
float	getMaxMag() always return 0
float	getMinMag() always returns 0
ZScenegraphObject	getParent() always return null
boolean	isPickable() always return false
boolean	isSelected() always return false
boolean	isVolatile() Always returns false
void	paint(ZRenderContext renderContext) always a noop
boolean	pick(java.awt.geom.Point2D pt) always a noop
void	select(ZCamera camera) always a noop
void	setAppData(java.lang.Object data) Always a noop
void	setMaxMag(float maxMag) always a noop
void	setMinMag(float minMag) always a noop
void	setParent(ZScenegraphObject parent) always a noop
void	setPickable(boolean pickable) always a noop
void	setSelected(boolean b) always a noop
void	setVisualComponent(ZVisualComponent child) always a noop
void	setVolatile(boolean v) Always a noop
void	unselect() always a noop
void	updateBounds() always a noop
void	updateChildBounds() always a noop
void	updateLocalBounds() always a noop

Methods inherited from class edu.umd.cs.jazz.scenegraph.ZVisualComponent

clone, computeLocalBounds, damage, findVisualComponent, isFindable, pick, pickBounds, select, setFindable, setSelected, setState, toString, updateVolatility, writeObject, writeObjectRecurse

Methods inherited from class java.lang.Object

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

Field Detail

instance

protected static ZDummyVisualComponent instance

Hang onto the one and only instance allowed to be created.

Constructor Detail

ZDummyVisualComponent

public ZDummyVisualComponent()
                      throws ZOperationNotAllowedException

Do not call this method directly. Use the static method getInstance

Throws:

ZOperationNotAllowedException - An attempt to create more than one ZDummyVisualComponent

See Also:

getInstance()

Method Detail

getInstance

public static ZDummyVisualComponent getInstance()

Returns the one and only ZDummyVisualComponent

findNode

public ZNode findNode()

Overrides:

findNode in class ZVisualComponent

isVolatile

public boolean isVolatile()

Always returns false

Overrides:

isVolatile in class ZVisualComponent

setVolatile

public void setVolatile(boolean v)

Always a noop

Parameters:

v -

Overrides:

setVolatile in class ZVisualComponent

getAppData

public java.lang.Object getAppData()

Always returns false

setAppData

public void setAppData(java.lang.Object data)

Always a noop

Parameters:

data -

getMinMag

public float getMinMag()

always returns 0

setMinMag

public void setMinMag(float minMag)

always a noop

Parameters:

minMag -

getMaxMag

public float getMaxMag()

always return 0

setMaxMag

public void setMaxMag(float maxMag)

always a noop

Parameters:

maxMag -

isSelected

public boolean isSelected()

always return false

Overrides:

isSelected in class ZVisualComponent

setSelected

public void setSelected(boolean b)

always a noop

Parameters:

b -

getParent

public ZScenegraphObject getParent()

always return null

Overrides:

getParent in class ZVisualComponent

setParent

public void setParent(ZScenegraphObject parent)

always a noop

Parameters:

parent -

Overrides:

setParent in class ZVisualComponent

isPickable

public boolean isPickable()

always return false

Overrides:

isPickable in class ZVisualComponent

setPickable

public void setPickable(boolean pickable)

always a noop

Parameters:

pickable -

Overrides:

setPickable in class ZVisualComponent

select

public void select(ZCamera camera)

always a noop

Overrides:

select in class ZVisualComponent

unselect

public void unselect()

always a noop

Overrides:

unselect in class ZVisualComponent

paint

public void paint(ZRenderContext renderContext)

always a noop

Parameters:

g2 -

Overrides:

paint in class ZVisualComponent

damage

public void damage()

always a noop

Overrides:

damage in class ZVisualComponent

updateBounds

public void updateBounds()

always a noop

Overrides:

updateBounds in class ZVisualComponent

updateChildBounds

public void updateChildBounds()

always a noop

Overrides:

updateChildBounds in class ZVisualComponent

updateLocalBounds

public void updateLocalBounds()

always a noop

Overrides:

updateLocalBounds in class ZVisualComponent

getLocalBounds

public ZBounds getLocalBounds()

always a noop

Overrides:

getLocalBounds in class ZVisualComponent

pick

public boolean pick(java.awt.geom.Point2D pt)

always a noop

Parameters:

pt -

setVisualComponent

public void setVisualComponent(ZVisualComponent child)

always a noop

Parameters:

child -

Overrides:

setVisualComponent in class ZVisualComponent