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package tesseract.objects;
import java.util.List;
import javax.vecmath.Vector3f;
/**
* This class is the an abstract parent class for forceable objects.
*
* @author Jesse Morgan
*/
public abstract class ForceableObject
extends PhysicalObject implements Forceable {
/**
* The inverse of the object's mass.
*/
protected float myInverseMass;
/**
* Object's velocity.
*/
private Vector3f myVelocity;
/**
* Sum of all the forces affecting this object.
*/
private Vector3f myForces;
/**
* Construct a new ForceableObject.
*
* @param position Initial Position.
* @param mass Initial Mass.
*/
public ForceableObject(final Vector3f position, final float mass) {
super(position);
myInverseMass = 1 / mass;
myVelocity = new Vector3f(0, 0, 0);
myForces = new Vector3f(0, 0, 0);
}
/**
* @return The inverse mass of the object.
*/
public float getInverseMass() {
return myInverseMass;
}
/**
* @return Get the velocity of the object.
*/
public Vector3f getVelocity() {
return myVelocity;
}
/**
* Apply a new force to this object.
* @param force The force to apply.
*/
public void addForce(final Vector3f force) {
myForces.add(force);
}
/**
* Update the state of the forceable object.
*
* @param duration The length of time that has passed.
* @return A list of new objects to add to the world.
*/
public List<PhysicalObject> updateState(final float duration) {
List<PhysicalObject> children = super.updateState(duration);
// The force vector now becomes the acceleration vector.
myForces.scale(myInverseMass);
myPosition.scaleAdd(duration, myVelocity, myPosition);
myPosition.scaleAdd(duration * duration / 2, myForces, myPosition);
myVelocity.scaleAdd(duration, myForces, myVelocity);
// The force vector is cleared.
myForces.x = 0;
myForces.y = 0;
myForces.z = 0;
updateTransformGroup();
return children;
}
}
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