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package tesseract.forces;
import javax.vecmath.Vector3f;
import tesseract.objects.PhysicalObject;
/**
* Generic downward force class (aka Gravity).
*
* @author Jesse Morgan
*/
public class Gravity extends Force {
/**
* Default gravity force.
*/
private static final float DEFAULT_GRAVITY = 1f;
/**
* The force used here.
*/
private float myGravity;
/**
* Create a default gravity.
*/
public Gravity() {
myGravity = DEFAULT_GRAVITY;
}
/**
* Create gravity with a custom strength.
*
* @param gravity The strength of gravity.
*/
public Gravity(final float gravity) {
myGravity = gravity;
}
/**
* Calculate the force of gravity...
*
* @param obj The object the force is calculated for.
* @return A vector describing the force
*/
protected Vector3f calculateForce(final PhysicalObject obj) {
return new Vector3f(0, -myGravity, 0);
}
}
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