dualroids
Class SpatialObject

java.lang.Object
  |
  +--dualroids.SpatialObject

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

Asteroid, Bullet, SpaceShip

public abstract class SpatialObject

extends Object

implements Serializable

The common superclass for all spatial objects.

See Also:

Serialized Form

Field Summary

static Color[]	COLOR_TABLE 17 shades of gray ready to use in Asteroid and SpaceShip objects
static int	COLOR_TABLE_BLACK The index of black in COLOR_TABLE.
static int	COLOR_TABLE_GRAY_50 The index of 50% gray in COLOR_TABLE.
static int	COLOR_TABLE_WHITE The index of white in COLOR_TABLE.
protected GeneralPath	geometry The untranslated geometric representation of the spatial object
protected double	locationX The x coordinate of the center of the spatial object at the moment indicated by timestamp.
protected double	locationY The y coordinate of the center of the spatial object at the moment indicated by timestamp.
protected long	timestamp The moment in game (server) time for which the other fields are valid.
protected AffineTransform	transform The AffineTransform used for calculating the translated geometry.
protected double	velocityX The x component of the valocity of the spatial object at the moment indicated by timestamp.
protected double	velocityY The y component of the valocity of the spatial object at the moment indicated by timestamp.

Constructor Summary

protected	SpatialObject() Dummy constructor for keeping the serialization framework happy.
protected	SpatialObject(double locationX, double locationY, double velocityX, double velocityY, long timestamp) Contructs a new SpatialObject.

Method Summary

abstract Shape	getTransformedShape(long time) Returns a properly translated Shape representing the spatial object at time
static double	moveToRangeX(double value) Moves value to the range 0.0...Arena.WIDTH so that the coordinate wraps around.
static double	moveToRangeY(double value) Moves value to the range 0.0...Arena.HEIGHT so that the coordinate wraps around.

Methods inherited from class java.lang.Object

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

Field Detail

COLOR_TABLE_BLACK

public static final int COLOR_TABLE_BLACK

The index of black in COLOR_TABLE.

COLOR_TABLE_WHITE

public static final int COLOR_TABLE_WHITE

The index of white in COLOR_TABLE.

COLOR_TABLE_GRAY_50

public static final int COLOR_TABLE_GRAY_50

The index of 50% gray in COLOR_TABLE.

COLOR_TABLE

public static final Color[] COLOR_TABLE

17 shades of gray ready to use in Asteroid and SpaceShip objects

timestamp

protected long timestamp

The moment in game (server) time for which the other fields are valid.

geometry

protected transient GeneralPath geometry

The untranslated geometric representation of the spatial object

locationX

protected double locationX

The x coordinate of the center of the spatial object at the moment indicated by timestamp.

locationY

protected double locationY

The y coordinate of the center of the spatial object at the moment indicated by timestamp.

velocityX

protected double velocityX

The x component of the valocity of the spatial object at the moment indicated by timestamp.

velocityY

protected double velocityY

The y component of the valocity of the spatial object at the moment indicated by timestamp.

transform

protected transient AffineTransform transform

The AffineTransform used for calculating the translated geometry. Stored here in order to avoid unnecessary feeding of the GC.

Constructor Detail

SpatialObject

protected SpatialObject(double locationX,
                        double locationY,
                        double velocityX,
                        double velocityY,
                        long timestamp)

Contructs a new SpatialObject.

Parameters:

locationX - the x coordinate of the initial location

locationY - the y coordinate of the initial location

velocityX - the x component of the velocity

velocityY - the y component of the velocity

angle - the angle in radians

timestamp - the moment in game (server) time for which the other data is valid

SpatialObject

protected SpatialObject()

Dummy constructor for keeping the serialization framework happy.

Method Detail

moveToRangeX

public static final double moveToRangeX(double value)

Moves value to the range 0.0...Arena.WIDTH so that the coordinate wraps around.

Parameters:

value - the value to wrap

Returns:

the wrapped value

moveToRangeY

public static final double moveToRangeY(double value)

Moves value to the range 0.0...Arena.HEIGHT so that the coordinate wraps around.

Parameters:

value - the value to wrap

Returns:

the wrapped value

getTransformedShape

public abstract Shape getTransformedShape(long time)

Returns a properly translated Shape representing the spatial object at time

Parameters:

time - the moment in game (server) time for which the representation is requested

Returns:

the Shape representation at time or null if the object isn't visible