org.starhope.appius.physica
Class CollisionObject

java.lang.Object
  org.starhope.appius.physica.CollisionObject

All Implemented Interfaces:

Collidable

public final class CollisionObject
extends Object
implements Collidable

A generic collision object. Used primarily for 'rewinding' objects when they collide so that the true point of collision can be found

Author:

ewinkelman

Field Summary

private Coord2D	centerofMass Object's center of mass
private boolean	changed Determines if this object has changed since the last reset
private PolygonPrimitive<?>	collisionBounds Object's collision boundaries
private double	mass Object's mass
private long	moveEndTime The time the object will stop moving
private long	moveStartTime The time the object started moving
private long	referenceTime The current time index for this snapshot
private Vector2D	velocity Object's velocity

Constructor Summary

CollisionObject(Collidable obj, long currentTime)
WRITEME: Document this constructor

Method Summary

boolean	changed() Gets the current moved status
Coord2D	getCenterOfMass() Gets the object's current center of mass in world coordinates
PolygonPrimitive<?>	getCollisionBounds() Gets the collision boundaries for the object
long	getEndMovementTime(long currentTime)
double	getMass() Gets the mass of the collidable object
long	getStartMovementTime()
Vector2D	getVelocity() Gets the object's current velocity
void	move(long milliseconds) Moves the object forward/backwards by x milliseconds Also watches for objects that start/stop
void	reset() Resets the moved flag
void	setCenterOfMass(Coord2D com) Sets the center of mass
void	setVelocity(Vector2D newVelocity) Sets the object's new velocity

Methods inherited from class java.lang.Object

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

Field Detail

centerofMass

private Coord2D centerofMass

Object's center of mass

collisionBounds

private PolygonPrimitive<?> collisionBounds

Object's collision boundaries

mass

private final double mass

Object's mass

moveStartTime

private final long moveStartTime

The time the object started moving

moveEndTime

private final long moveEndTime

The time the object will stop moving

referenceTime

private long referenceTime

The current time index for this snapshot

velocity

private Vector2D velocity

Object's velocity

changed

private boolean changed

Determines if this object has changed since the last reset

Constructor Detail

CollisionObject

public CollisionObject(Collidable obj,
                       long currentTime)

WRITEME: Document this constructor

Parameters:

obj - WRITEME

currentTime - WRITEME

Method Detail

changed

public boolean changed()

Gets the current moved status

Returns:

WRITEME

getCenterOfMass

public Coord2D getCenterOfMass()

Description copied from interface: Collidable

Gets the object's current center of mass in world coordinates

Specified by:

getCenterOfMass in interface Collidable

Returns:

A 2D point representing the center of mass

See Also:

Collidable.getCenterOfMass()

getCollisionBounds

public PolygonPrimitive<?> getCollisionBounds()

Description copied from interface: Collidable

Gets the collision boundaries for the object

Specified by:

getCollisionBounds in interface Collidable

Returns:

A polygon outlining the boundaries of the object

See Also:

Collidable.getCollisionBounds()

getEndMovementTime

public long getEndMovementTime(long currentTime)

Specified by:

getEndMovementTime in interface Collidable

Parameters:

currentTime - The current time

Returns:

the time the object will stop moving

See Also:

Collidable.getEndMovementTime(long)

getMass

public double getMass()

Description copied from interface: Collidable

Gets the mass of the collidable object

Specified by:

getMass in interface Collidable

Returns:

Mass

See Also:

Collidable.getMass()

getStartMovementTime

public long getStartMovementTime()

Specified by:

getStartMovementTime in interface Collidable

Returns:

the time the object started moving

See Also:

Collidable.getStartMovementTime()

getVelocity

public Vector2D getVelocity()

Description copied from interface: Collidable

Gets the object's current velocity

Specified by:

getVelocity in interface Collidable

Returns:

A 2D velocity vector

See Also:

Collidable.getVelocity()

move

public void move(long milliseconds)

Moves the object forward/backwards by x milliseconds Also watches for objects that start/stop

Parameters:

milliseconds - WRITEME

reset

public void reset()

Resets the moved flag

setCenterOfMass

public void setCenterOfMass(Coord2D com)

Sets the center of mass

Specified by:

setCenterOfMass in interface Collidable

Parameters:

com - New center of mass in world coordinates

See Also:

Collidable.setCenterOfMass(Coord2D)

setVelocity

public void setVelocity(Vector2D newVelocity)

Description copied from interface: Collidable

Sets the object's new velocity

Specified by:

setVelocity in interface Collidable

Parameters:

newVelocity - WRITEME

See Also:

Collidable.setVelocity(Vector2D)