breakout
Class BasicBall

java.lang.Object
  breakout.BasicBall

All Implemented Interfaces:

Ball, BreakoutComponent, Rebounding

public class BasicBall

extends java.lang.Object

implements Ball

Basic implementation of a Ball, with velocity arbitrarily picked at magnitude 3 and direction pi/3.

Field Summary

static int	DEFAULT_DIAM The diameter of a BasicBall.
protected boolean	diedrebounding Whether or not we died during the last resolveBounces phase of the tick.
protected java.awt.geom.Point2D.Double	location The location of this BasicBall.
protected java.awt.Dimension	size The size of this BasicBall.
protected java.awt.geom.Line2D.Float	velvect The velocity vector of this BasicBall.

Constructor Summary

BasicBall()
Creates a default ball with speed 3, direction pi/3, and diameter 10

Method Summary

boolean	diedWhileRebounding() Tells whether we hit the floor the last time we resolved bounces.
java.awt.Point	getLocation() Gets the current coordinates of the ball, cast to an integer grid.
java.awt.Shape	getShape() Gets the java.awt.Shape of this ball.
java.awt.Dimension	getSize() Gets the current size of the ball.
boolean	hit(BreakoutComponent bc) Called by an object implementing the Rebounding interface when it has detected an intersection with this ball.
void	paint(java.awt.Graphics g) Paints the ball.
void	resolveBounces(java.util.Iterator it) Checks all the BreakoutComponents in an iterator to see if it intersects them, hit()s them, and recalculates its velocity vector.
void	setLocation(java.awt.Point p) Sets the location of this ball to (p.x, p.y).
void	update() Called by World every tick; sets the new location of the ball, as affected by velocity.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_DIAM

public static final int DEFAULT_DIAM

The diameter of a BasicBall.

See Also:

Constant Field Values

location

protected java.awt.geom.Point2D.Double location

The location of this BasicBall. Uses Point2D.Double to increase the accuracy of velocity calculations.

size

protected java.awt.Dimension size

The size of this BasicBall.

velvect

protected java.awt.geom.Line2D.Float velvect

The velocity vector of this BasicBall.

diedrebounding

protected boolean diedrebounding

Whether or not we died during the last resolveBounces phase of the tick.

Constructor Detail

BasicBall

public BasicBall()

Creates a default ball with speed 3, direction pi/3, and diameter 10

Method Detail

setLocation

public void setLocation(java.awt.Point p)

Sets the location of this ball to (p.x, p.y).

Specified by:

setLocation in interface BreakoutComponent

Parameters:

p - A Point object representing the ball's intended location.

getLocation

public java.awt.Point getLocation()

Gets the current coordinates of the ball, cast to an integer grid.

Specified by:

getLocation in interface BreakoutComponent

Returns:

a new Point object representing the approximate location of the ball.

getSize

public java.awt.Dimension getSize()

Gets the current size of the ball.

Specified by:

getSize in interface BreakoutComponent

Returns:

a new Dimension object representing the size of the ball.

update

public void update()

Called by World every tick; sets the new location of the ball, as affected by velocity.

Specified by:

update in interface BreakoutComponent

hit

public boolean hit(BreakoutComponent bc)

Called by an object implementing the Rebounding interface when it has detected an intersection with this ball. If this method is overridden in a subclass, it should be sure to call super(bc) to maintain the mechanism that manages the death of balls when they hit the floor.

Specified by:

hit in interface BreakoutComponent

Parameters:

bc - The BreakoutComponent/Rebounding object that detected the hit.

Returns:

false. Invalid to return true, since Rebounding objects may not be removed during the phase of the tick where hits are calculated.

See Also:

BreakoutComponent, Rebounding

getShape

public java.awt.Shape getShape()

Gets the java.awt.Shape of this ball.

Specified by:

getShape in interface BreakoutComponent

Returns:

a new Shape label at the same location and of the same size/shape as this ball.

paint

public void paint(java.awt.Graphics g)

Paints the ball.

Specified by:

paint in interface BreakoutComponent

Parameters:

g - Graphics object for this ball's coordinate frame(ie, already located where we are).

See Also:

BoardPanel

resolveBounces

public void resolveBounces(java.util.Iterator it)

Checks all the BreakoutComponents in an iterator to see if it intersects them, hit()s them, and recalculates its velocity vector.

Specified by:

resolveBounces in interface Rebounding

Parameters:

it - Iterator handed to it by World of all the BreakoutComponents on the current Board.

diedWhileRebounding

public boolean diedWhileRebounding()

Tells whether we hit the floor the last time we resolved bounces. This provides a way to allow balls to die without the component iterators complaining about being modified in the middle of iterating.

Specified by:

diedWhileRebounding in interface Rebounding

Returns:

true if we died while rebounding; false otherwise.