org.opensourcephysics.sip.ch05
Class Planet

java.lang.Object
  org.opensourcephysics.sip.ch05.Planet

All Implemented Interfaces:

Drawable, ODE

public class Planet
extends java.lang.Object
implements Drawable, ODE

Planet models and displays the motion of a planet using an inverse square force law. Students should test other ODESolvers in the Numerics package.

Constructor Summary

Planet()

Method Summary

void	doStep() Steps the differential equation and appends data to curve.
void	draw(DrawingPanel panel, java.awt.Graphics g) Draws the planet and its path.
void	getRate(double[] state, double[] rate) Gets the rate using the given state.
double[]	getState() Gets the state

Methods inherited from class java.lang.Object

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

Constructor Detail

Planet

public Planet()

Method Detail

doStep

public void doStep()

Steps the differential equation and appends data to curve.

getRate

public void getRate(double[] state,
                    double[] rate)

Gets the rate using the given state. Values in the rate array are overwritten.

Specified by:

getRate in interface ODE

Parameters:

state - the state

rate - the resulting rate

getState

public double[] getState()

Gets the state

Specified by:

getState in interface ODE

Returns:

the state

draw

public void draw(DrawingPanel panel,
                 java.awt.Graphics g)

Draws the planet and its path.

Specified by:

draw in interface Drawable

Parameters:

panel - the drawing panel

g - the graphics context