Package com.titan.math.function

Class GravitationFunction

java.lang.Object

com.titan.math.function.GravitationFunction

All Implemented Interfaces:

Function

public class GravitationFunction
extends Object
implements Function

Field Summary

Fields

Modifier and Type	Field	Description
static final double	G	gravitational constant

Constructor Summary

Constructors

Constructor	Description
GravitationFunction()

Method Summary

Modifier and Type	Method	Description
Vector	f(Vector positions, Vector ignore, Vector masses, double h, double t)	Calculates all the gravitational forces that are working in the system.

Methods inherited from class java.lang.Object

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

Field Details

G

public static final double G

gravitational constant

See Also:

• Constant Field Values

Constructor Details

GravitationFunction

public GravitationFunction()

Method Details

f

public Vector f(Vector positions,
 Vector ignore,
 Vector masses,
 double h,
 double t)

Calculates all the gravitational forces that are working in the system. Iterates over all the objects based on the masses vector.

Gravitational force of all the objects j pulling on object i are calculated with this formula:

F = - sum( G * mi * mj * (pi - pj) / (||pi - pj||^3)

where:
- mi and mj are the masses of the objects i and j
- pi and pj are the positions of the objects i and j

Specified by:

f in interface Function

Parameters:

positions - the positions of the objects (every 3 entries, the next object is referenced)

ignore - this function does not use this vector in its calculations

masses - the masses of the objects (same order as in the positions)

Returns:

a vector of the gravitational forces working in the system