ballworld.model.paint.strategy

Class BallPaintStrategy

java.lang.Object

ballworld.model.paint.strategy.BallPaintStrategy

All Implemented Interfaces:

IPaintStrategy

public class BallPaintStrategy
extends java.lang.Object
implements IPaintStrategy

Paint strategy that paints a filled circle with the Ball's radius. This functionality is duplicated by the EllipsePaintStrategy. The class demonstrates a direct implementation of IPaintStrategy.

Field Summary

Fields

Modifier and Type	Field and Description
private java.awt.geom.AffineTransform	at The AffineTransformed used for internal calculations.
private java.awt.geom.Ellipse2D.Double	ball Unit sized circle used as a prototype

Fields inherited from interface ballworld.model.IPaintStrategy

NullObject

Constructor Summary

Constructors

Constructor and Description
BallPaintStrategy() No parameter constructor that creates a 1 pixel radius ball at the origin.
BallPaintStrategy(java.awt.geom.AffineTransform at, double x, double y, double width, double height) Constructor that allows one to create the prototype ball of arbitrary dimension and location.

Method Summary

Modifier and Type	Method and Description
void	init(Ball context) By default, do nothing for initialization.
void	paint(java.awt.Graphics g, Ball host) Paints on the given graphics context using the color, scale and direction provided by the host.
void	paintXfrm(java.awt.Graphics g, Ball host, java.awt.geom.AffineTransform at) Paints a transformed circle, as per the given AffineTransform Uses color already set in Graphics context

Methods inherited from class java.lang.Object

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

Field Detail

ball

private java.awt.geom.Ellipse2D.Double ball

Unit sized circle used as a prototype

at

private java.awt.geom.AffineTransform at

The AffineTransformed used for internal calculations.

Constructor Detail

BallPaintStrategy

public BallPaintStrategy()

No parameter constructor that creates a 1 pixel radius ball at the origin. Instantiates a new AffineTransform for internal use.

BallPaintStrategy

public BallPaintStrategy(java.awt.geom.AffineTransform at,
                         double x,
                         double y,
                         double width,
                         double height)

Constructor that allows one to create the prototype ball of arbitrary dimension and location. The AffineTransform is externally supplied.

Parameters:

at - The AffineTransform to use for internal calculations

x - floating point x-coordinate of center of circle

y - floating point y-coordinate of center of circle

width - floating point x-radius of the circle (ellipse)

height - floating point y-radius of the circle (ellipse)

Method Detail

paint

public void paint(java.awt.Graphics g,
                  Ball host)

Paints on the given graphics context using the color, scale and direction provided by the host. This is done by setting up the AffineTransform to scale then translate. Calls paintXfrm to actually perform the painting, using the set up transform. Calls paintCfg just before calling paintXfrm param g The Graphics context that will be paint on param host The host Ball that the required information will be pulled from.

Specified by:

paint in interface IPaintStrategy

Parameters:

g - The graphics context to draw upon.

host - The host ball.

paintXfrm

public void paintXfrm(java.awt.Graphics g,
                      Ball host,
                      java.awt.geom.AffineTransform at)

Paints a transformed circle, as per the given AffineTransform Uses color already set in Graphics context

Parameters:

g - The Graphics context to paint on

host - The Ball host

at - the AffineTransform to use

init

public void init(Ball context)

By default, do nothing for initialization.

Specified by:

init in interface IPaintStrategy

Parameters:

context - The ball to initialize.