model.physics

Class PhysicsEngine

java.lang.Object

model.physics.PhysicsEngine

All Implemented Interfaces:

IPhysicsEngine

public class PhysicsEngine
extends java.lang.Object
implements IPhysicsEngine

Implementation of the physics engine

Author:

Tom Wu and Roxanne Baker

Constructor Summary

Constructors

Constructor and Description
PhysicsEngine()
PhysicsEngine(boolean gravityActive, boolean collisionDetectionActive, boolean frictionActive)

Method Summary

Modifier and Type	Method and Description
void	applyCollisions(ILevel universe, boolean dynamicsOn) Marks Collision IComponents of applicable IEntities in universe with appropriate collidingIDs
void	applyGravity(ILevel universe, double secondsPassed)
boolean	applyImpulse(IEntity body, Vector impulse) Useful for debugging but will be deprecated! Applies impulse J to IEntity body
void	changeVelocityAfterCollision(IEntity firstEntity, IEntity secondEntity)
void	setCollisionDetectionActive(boolean collisionDetectionActive)
void	setFrictionActive(boolean frictionActive)
void	setGravityActive(boolean gravityActive)
void	update(ILevel universe, double dt) Update Positions of IEntities in universe based on dt and their Velocities

Methods inherited from class java.lang.Object

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

Constructor Detail

PhysicsEngine

public PhysicsEngine()

PhysicsEngine

public PhysicsEngine(boolean gravityActive,
                     boolean collisionDetectionActive,
                     boolean frictionActive)

Method Detail

update

public void update(ILevel universe,
                   double dt)

Description copied from interface: IPhysicsEngine

Update Positions of IEntities in universe based on dt and their Velocities

Specified by:

update in interface IPhysicsEngine

Parameters:

universe - IEntitySystem containing IEntities with both Positions and Velocities

dt - duration of update in seconds

applyImpulse

public boolean applyImpulse(IEntity body,
                            Vector impulse)

Description copied from interface: IPhysicsEngine

Useful for debugging but will be deprecated! Applies impulse J to IEntity body

Specified by:

applyImpulse in interface IPhysicsEngine

Parameters:

body - IEntity with Mass, Position, and Velocity

impulse - Impulse vector used to calculate the updated Velocity

Returns:

whether J is successfully applied to body (false if body does not have Mass, Position, and Velocity)

applyGravity

public void applyGravity(ILevel universe,
                         double secondsPassed)

applyCollisions

public void applyCollisions(ILevel universe,
                            boolean dynamicsOn)

Description copied from interface: IPhysicsEngine

Marks Collision IComponents of applicable IEntities in universe with appropriate collidingIDs

Specified by:

applyCollisions in interface IPhysicsEngine

Parameters:

universe - IEntitySystem containing IEntities with both Positions and Collisions

dynamicsOn - if true, then impulses are subsequently applied to applicable IEntities (with Mass, Position, Velocity, and of course, Collision)

changeVelocityAfterCollision

public void changeVelocityAfterCollision(IEntity firstEntity,
                                         IEntity secondEntity)

setGravityActive

public void setGravityActive(boolean gravityActive)

setCollisionDetectionActive

public void setCollisionDetectionActive(boolean collisionDetectionActive)

setFrictionActive

public void setFrictionActive(boolean frictionActive)