private void AddMoon(float mass, float radius, float distance)
{
// Instantiate a moon and set appropriate variables
CellestialPhysics obj = Instantiate(moonPrefab, planet.transform.position + new Vector3(distance / KilometersPerSquare, 0, 0), Quaternion.identity);
obj.mass = mass;
obj.radius = radius;
obj.SetImageScale(KilometersPerSquare);
// Apply starting speed perpendicular to gravitational force to achieve stable orbit
Vector2 distanceVector = obj.transform.position - planet.transform.position;
float speed = (float)Math.Sqrt(66.742f * planet.mass / distance);
Vector2 directionVector = new Vector2(distanceVector.y, -distanceVector.x);
obj.SetSpeed(directionVector.normalized * speed);
// Add moon object to moons list
cellObjs.Add(obj);
Pair <CellestialPhysics> temp;
// Add all new moon-moon combinations
for (int i = cellObjs.Count - 2; i >= 0; i--)
{
temp = new Pair <CellestialPhysics>(obj, cellObjs[i]);
objectCombos.Add(temp);
}
// Plus one planet-moon combination
temp = new Pair <CellestialPhysics>(planet, obj);
objectCombos.Add(temp);
// Log what's been done
Debug.Log(String.Format("Added new moon (mass: {0} Yg, radius: {1} km, distance: {2} km)", mass, radius, distance));
}
Projection FindProjection(ProjType type, CellestialPhysics obj, Vector3 axis)
{
// Finds min (ProjType.BEGIN) or max (ProjType.END) projection of
// an object on the provided axis
// -- mark the axis you're interested in with a 1 for that vector
// component, leave all others on 0, i.e (0,1,0) checks the Y axis
Projection proj = new Projection();
proj.body = obj;
SpriteRenderer sr = obj.GetComponent <SpriteRenderer>();
float num;
switch (type)
{
case ProjType.BEGIN:
num = Vector3.Dot(axis, sr.bounds.min);
proj.value = num;
proj.type = ProjType.BEGIN;
break;
case ProjType.END:
num = Vector3.Dot(axis, sr.bounds.max);
proj.value = num;
proj.type = ProjType.END;
break;
}
return(proj);
}
void Awake()
{
// Initialization
objectCombos = new List <Pair <CellestialPhysics> >();
cellObjs = new List <CellestialPhysics>();
// Instantiate the earth in the middle of the scene
planet = (CellestialPhysics)Instantiate(planetPrefab, new Vector3(0, 0, 0), Quaternion.identity);
planet.mass = 5972.6f;
planet.radius = 6371;
planet.SetImageScale(KilometersPerSquare);
}
Vector2 CalculateGravitationalForce(CellestialPhysics o1, CellestialPhysics o2)
{
// Calculates the gravitational force between two cellestial objects
// return: Vector2 force - the grav. force vector pointing from o1 to o2
float mass1 = o1.mass;
float mass2 = o2.mass;
Vector2 distanceVector = o2.transform.position - o1.transform.position;
float distance = distanceVector.magnitude * KilometersPerSquare;
float gravScalar = 66.742f * (mass1 * mass2) / (distance * distance); // Gravitational force formula (result is in YN)
Vector2 force = distanceVector.normalized * gravScalar;
return(force);
}
public Projection()
{
value = 0;
body = null;
type = ProjType.BEGIN;
}
public Projection(float val, CellestialPhysics obj, ProjType t)
{
value = val;
body = obj;
type = t;
}
