game
Class MovingBody

java.lang.Object
  game.MovingBody

All Implemented Interfaces:

Animated

Direct Known Subclasses:

CurveTracer, MovingGraphic, MovingGraphics

public abstract class MovingBody
extends java.lang.Object
implements Animated

An articulated class between Animated and specific classes that implement Animated. Responsibility is held here for tracking whether the motion goes out of bounds, in which case the object will no longer move and will be asked to die. The responsibility is enforced by making tick() "final", so no subclass can usurp it. Flexibility of reacting to ticks is given by abstract methods such as respondAfterTick(), which any subclass can implement and act as it pleases.

Author:

cytron

Field Summary

protected Point	lr
protected boolean	outOfBounds
protected Point	start
protected Point	ul

Constructor Summary

MovingBody(Trackable trajectory, Point ul, Point lr)
Accommodates a trajectory within a space bounded by two corners with animation.

Method Summary

void	die() Fulfills the Animated interface, and allow subclasses to respond to their death.
protected Point	getLocation()
Point	getStart() Getter
protected boolean	inBounds(Point p)
boolean	isDone() Fulfills the Animated interface.
abstract void	respondAfterTick() Give subclasses a chance to respond to each tick
abstract void	respondToDeath() Give subclasses a chance to respond to their death
void	setTrajectory(Trackable t) Setter in case we want to change course midway through
boolean	tick(int milliseconds) Fulfills the Animated interface, and allows subclasses to respond after the tick.

Methods inherited from class java.lang.Object

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

Field Detail

ul

protected final Point ul

lr

protected final Point lr

start

protected final Point start

outOfBounds

protected boolean outOfBounds

Constructor Detail

MovingBody

public MovingBody(Trackable trajectory,
                  Point ul,
                  Point lr)

Accommodates a trajectory within a space bounded by two corners with animation.

Parameters:

trajectory - The path to be followed

ul - Upper-left-hand corner of the displayable field

lr - Lower-right-hand corner of the displayable field

Method Detail

getStart

public Point getStart()

Getter

Returns:

location of the trajectory when this class was instantiated.

setTrajectory

public void setTrajectory(Trackable t)

Setter in case we want to change course midway through

respondAfterTick

public abstract void respondAfterTick()

Give subclasses a chance to respond to each tick

respondToDeath

public abstract void respondToDeath()

Give subclasses a chance to respond to their death

die

public final void die()

Fulfills the Animated interface, and allow subclasses to respond to their death.

Specified by:

die in interface Animated

tick

public final boolean tick(int milliseconds)

Fulfills the Animated interface, and allows subclasses to respond after the tick. Is "final" so that no subclass can hijack this implementation of tick() by overriding it. This assures us that we can check whether the current location is in bounds or not.

Specified by:

tick in interface Animated

Parameters:

milliseconds - time tick in milliseconds

Returns:

true if we are still in bounds of the displayable field

isDone

public final boolean isDone()

Fulfills the Animated interface. We are done if our shape has moved out of bounds.

Specified by:

isDone in interface Animated

Returns:

true if the object no longer should move

getLocation

protected final Point getLocation()

inBounds

protected final boolean inBounds(Point p)