simulations.experiments.electrostatics
Class ChargeInFieldExperiment

java.lang.Object
  simulations.experiments.BaseExperiment
      simulations.experiments.electrostatics.ChargeInFieldExperiment

public class ChargeInFieldExperiment

extends BaseExperiment

Experiment to show the electric field motion for an electric charge moving in a constant background electric field. Extends BaseExperiment. We provide a method getHue which allows us to color the field lines connected to the charge a different color than the field lines connected to the charges which produce the constant field.

Nested Class Summary

class

ChargeInFieldExperiment.Motion the equation of motion for a charge in an electric field

Field Summary

private MovingPointCharge	charge the charge (initially moving upward)
private EMCollection	collection collection of EM objects consisting of the charge and the constant electric field
private double	E electric field
private ChargeInFieldExperiment.Motion	equations equation of motion of the particle
private ConstantFields	fields the electric field pointing downward
private RungeKuttaIntegration	integrator integrator for the equation of motion of the particle
private double	m mass of the particle
private double	q charge of the particle
private double	t time
private double	v z velocity of the particle
private double	z z position of the particle

Fields inherited from class simulations.experiments.BaseExperiment

eps, FieldMotionType, FieldType, FluidFlowSpeed, Fnorm, Fpower, numberSmallSteps

Constructor Summary

ChargeInFieldExperiment(double E, double q, double m, double z0, double v0)
constructor for charge in field experiment

Method Summary

void	ConstructEMSource() constructs the EM source consisting of the charge and the constant field
void	Evolve(double dt) method to evolve the particle motion in time
BaseObject	getEMSource() returns the collecton of charge and constant field as the EM source
double	getFlowSpeed(Vec3 r, Vec RegionFlow) Method to find the flow speed in a given region when we are determining that speed according to region.
double	getHue(double TargetHue, Vec3 r, Vec RegionColor) Method to find the hue in a given region when we are coloring according to region (Color Mode 4).
private static void	println(java.lang.String s) prints the string s

Methods inherited from class java.lang.Object

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

Field Detail

E

private double E

electric field

q

private double q

charge of the particle

m

private double m

mass of the particle

z

private double z

z position of the particle

v

private double v

z velocity of the particle

t

private double t

time

charge

private MovingPointCharge charge

the charge (initially moving upward)

fields

private ConstantFields fields

the electric field pointing downward

collection

private EMCollection collection

collection of EM objects consisting of the charge and the constant electric field

equations

private ChargeInFieldExperiment.Motion equations

equation of motion of the particle

integrator

private RungeKuttaIntegration integrator

integrator for the equation of motion of the particle

Constructor Detail

ChargeInFieldExperiment

public ChargeInFieldExperiment(double E,
                               double q,
                               double m,
                               double z0,
                               double v0)

constructor for charge in field experiment

Parameters:

E - background electric field

q - charge

m - mass of charge

z0 - initial position of charge at t = 0

v0 - initial velocity of charge at t = 0

Method Detail

ConstructEMSource

public void ConstructEMSource()

constructs the EM source consisting of the charge and the constant field

Specified by:

ConstructEMSource in class BaseExperiment

getEMSource

public BaseObject getEMSource()

returns the collecton of charge and constant field as the EM source

Specified by:

getEMSource in class BaseExperiment

Evolve

public void Evolve(double dt)

method to evolve the particle motion in time

Specified by:

Evolve in class BaseExperiment

println

private static void println(java.lang.String s)

prints the string s

getHue

public double getHue(double TargetHue,
                     Vec3 r,
                     Vec RegionColor)

Method to find the hue in a given region when we are coloring according to region (Color Mode 4).

Specified by:

getHue in class BaseExperiment

Parameters:

TargetHue - This is the target hue from the renderer.

r - This is the vector postion of the point in the image.

RegionColor - This is the varous hues for the regions.

Returns:

The hue for the part of the image map at r.

getFlowSpeed

public double getFlowSpeed(Vec3 r,
                           Vec RegionFlow)

Method to find the flow speed in a given region when we are determining that speed according to region. This method is used when we have set experiment.FieldMotionType to one of either Constants.FIELD_MOTION_VREFIELD or Constants.FIELD_MOTION_VRBFIELD.

Specified by:

getFlowSpeed in class BaseExperiment

Parameters:

r - This is the vector postion of the point in the image.

RegionFlow - This is the flow speeds for the regions.

Returns:

The flow speed for the part of the image map at r.