fr.inria.zuist.engine

Class SceneObserver

java.lang.Object

fr.inria.zuist.engine.SceneObserver

Direct Known Subclasses:

LensSceneObserver, PortalSceneObserver, ViewSceneObserver

public abstract class SceneObserver
extends Object

Constructor Summary

Constructors

Constructor and Description
SceneObserver()

Method Summary

Modifier and Type	Method and Description
abstract double	getAltitude()
Camera	getCamera()
int	getCurrentLevel() Get the current level.
LevelListener	getLevelListener()
double	getPreviousAltitude()
RegionListener	getRegionListener()
VirtualSpace	getTargetVirtualSpace(Region r) Region is irrelevant for basic SceneObservers.
VirtualSpace[]	getTargetVirtualSpaces() This is overridden by more elaborate SceneObservers such as TagggedViewSceneObserver.
abstract double[]	getVisibleRegion()
abstract double	getX()
abstract double	getY()
boolean	isOfInterest(Region r) Tells the SceneManager whether a given region is of interest to this particular SceneObserver.
void	setLevelListener(LevelListener ll)
void	setPreviousAltitude(double a)
void	setRegionListener(RegionListener rl)

Methods inherited from class java.lang.Object

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

Constructor Detail

SceneObserver

public SceneObserver()

Method Detail

getVisibleRegion

public abstract double[] getVisibleRegion()

getAltitude

public abstract double getAltitude()

getX

public abstract double getX()

getY

public abstract double getY()

getTargetVirtualSpace

public VirtualSpace getTargetVirtualSpace(Region r)

Region is irrelevant for basic SceneObservers. It matters only when a decision has to be made about which VirtualSpace to return depending on the region's properties. For instance, it matters for TagggedViewSceneObserver, but it does not matter for ViewSceneObserver.

getTargetVirtualSpaces

public VirtualSpace[] getTargetVirtualSpaces()

This is overridden by more elaborate SceneObservers such as TagggedViewSceneObserver.

isOfInterest

public boolean isOfInterest(Region r)

Tells the SceneManager whether a given region is of interest to this particular SceneObserver. If it is, the SceneObserver crossing this region will trigger the loading of the ObjectDescriptions it contains. If it is not, the Region will be ignored. The default behaviour is to return true. Application-specific subclasses of SceneObserver can override this method to return true/false based, e.g., on the tags declared for the region.

getCamera

public Camera getCamera()

setPreviousAltitude

public void setPreviousAltitude(double a)

getPreviousAltitude

public double getPreviousAltitude()

getCurrentLevel

public int getCurrentLevel()

Get the current level.

Returns:

index of level at which camera is right now (highest level is 0)

setLevelListener

public void setLevelListener(LevelListener ll)

getLevelListener

public LevelListener getLevelListener()

setRegionListener

public void setRegionListener(RegionListener rl)

getRegionListener

public RegionListener getRegionListener()