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
static ZDummyVisualComponent	getInstance() Returns the one and only ZDummyVisualComponent
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	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	transformChanged(java.awt.geom.AffineTransform origTransform) always a noop
void	unselect() always a noop

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

clone, computeLocalBounds, damage, findNode, findVisualComponent, getLocalBounds, getParent, isFindable, pick, pickBounds, select, setFindable, setParent, setSelected, setState, toString, updateBounds, updateChildBounds, updateLocalBounds, 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

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

isSelected

public boolean isSelected()

always return false

Overrides:

isSelected in class ZVisualComponent

setSelected

public void setSelected(boolean b)

always a noop

Parameters:

b -

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

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

transformChanged

public void transformChanged(java.awt.geom.AffineTransform origTransform)

always a noop

Parameters:

child -

Overrides:

transformChanged in class ZVisualComponent