// Start is called before the first frame update
void Start()
{
rb = GetComponent <Rigidbody2D>();
gravObj = GetComponent <gravityObject>();
//enginePower = maxEnginePower;
fuelAmount = maxFuel;
}
public void applyGravityForce(gravityObject affected, gravityObject affecting)
{
//print ("applyGravityForce");
Vector3 affectedXYZ = affected.transform.position;
Vector3 affectingXYZ = affecting.transform.position;
float distance = (affectedXYZ - affectingXYZ).magnitude;
Vector3 direction = (affectingXYZ - affectedXYZ).normalized;
float force = (affected.masse * affecting.masse * gravityConstant) / Mathf.Pow(distance, 2);
//print ("force : "+force);
affected.GetComponent <Rigidbody>().AddForce(force * direction);
}
// The attract function is where we will compute all of the mathematics behind Newton's Law of Universal Gravitation
void Attract(gravityObject objToAttract)
{
//We get the rigidbody component from the object that was passed. Remember this contains all of the information about an objects mass.
Rigidbody rbToAttract = objToAttract.rb;
//We then determine the direction by subtracting the two rigidbody's positions. A position is represented by a Vector 3 in Unity. If you're unfamiliar with Unity, this is the X, Y, and Z axis of 3-Dimensional space
Vector3 direction = rb.position - rbToAttract.position;
//We can get the distance from our direction vector by reading it's magnitude and putting that into a variable. In Unity a Vector 3, will have a magnitude which is the same as a distance.
float distance = direction.magnitude;
//We then do Newton's equation: F = G * (M1 * M2) / R^2
float forceMagnitude = G * (rb.mass * rbToAttract.mass) / Mathf.Pow(distance, 2);
//We then have to normalize the direction we took earlier, which remember was a Vector 3. By normalizing it, we set it's magnitude(or distance) to 1. We multiply that normalized Vector 3 by our
//forceMagnitude and add that force to the object that we are attracting.
Vector3 force = direction.normalized * forceMagnitude;
rbToAttract.AddForce(force);
}