fang
Class CompositeTracker

java.lang.Object
  fang.Tracker
      fang.CompositeTracker

public final class CompositeTracker
extends Tracker

This class combines several trackers into a single tracker by composing the scaling, rotating, and translating. Since these operations are commutative, they compose seamlessly.

Field Summary

Fields inherited from class fang.Tracker

random

Constructor Summary

CompositeTracker(Tracker... tracker)
makes the CompositeTracker and adds all of the arguments to the list of trackers

Method Summary

void	addTracker(Tracker tracker) adds one tracker to compose.
void	advanceTime(double timePassed) Advancing the time of all the trackers contained in this tracker.
Tracker[]	getAllTrackers() gets all of the Trackers in this collection of Trackers
double	getRotationAddition() composes the trackers' rotation additions
double	getScaleFactor() composes the trackers' scaling factors
Coordinate	getTranslation() composes the trackers' translations
void	removeTracker(Tracker tracker) removes the tracker from the list of trackers composed.

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeTracker

public CompositeTracker(Tracker... tracker)

makes the CompositeTracker and adds all of the arguments to the list of trackers

Parameters:

tracker - the trackers to compose

Method Detail

getAllTrackers

public Tracker[] getAllTrackers()

gets all of the Trackers in this collection of Trackers

Returns:

all the trackers in this group of trackers

addTracker

public void addTracker(Tracker tracker)

adds one tracker to compose. The tracker being added must create a cycle of Trackers. For example, adding this tracker to itself would cause infinite recursion. Be sure to avoid more complex cyclic structures as well. CompositeTracker

Parameters:

tracker - the tracker to compose

removeTracker

public void removeTracker(Tracker tracker)

removes the tracker from the list of trackers composed. Trying to remove non-exitent trackers is ignored.

Parameters:

tracker - the tracker to remove

getTranslation

public Coordinate getTranslation()

composes the trackers' translations

Overrides:

getTranslation in class Tracker

Returns:

the sum of the translations

getScaleFactor

public double getScaleFactor()

composes the trackers' scaling factors

Overrides:

getScaleFactor in class Tracker

Returns:

the product of all scale factors

getRotationAddition

public double getRotationAddition()

composes the trackers' rotation additions

Overrides:

getRotationAddition in class Tracker

Returns:

the sum of all rotation additions

advanceTime

public void advanceTime(double timePassed)

Advancing the time of all the trackers contained in this tracker.

Overrides:

advanceTime in class Tracker

Parameters:

timePassed - the duration of time since the last call to advanceTime