com.rychlik.jode

Class JOde

java.lang.Object

com.rychlik.jode.JOde

All Implemented Interfaces:

Constraints, VField, java.io.Serializable, java.lang.Runnable

public class JOde
extends java.lang.Object
implements java.lang.Runnable, VField, Constraints, java.io.Serializable

This class JOde implements the functionality of an interactive ODE solver, or a tool for studying simple differential equations. Its capabilities include

• Slope (direction) fields
• Solution by several known algorithms
• Interactive editing of equations
• Parsing of arithmetical expressions

Version:

$Id: JOde.java,v 6.44 2005/05/02 08:09:25 marek Exp $

Author:

Marek Rychlik

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	ABSCISSA Constant ABSCISSA is the number of the axis which will be the abscissa of the coordinate system in the default GUI configuration.
static int	MAX_STEPS_THRESHOLD Constant MAX_STEPS_THRESHOLD is the maximal number of steps for numerical solvers.
static int	ORDINATE Constant ORDINATE is the number of the axis which will be the ordinate of the coordinate system in the default GUI configuration.
static int	RANGE_MAX Constant RANGE_MAX represents the default for maximum of the range of a variable.
static int	RANGE_MIN Constant RANGE_MIN represents the default for minimum of the range of a variable.
static boolean	USING_FORMAT_FOR_TICKS If set, DecimalFormat is used to format tick labels.

Constructor Summary

Constructors

Constructor and Description
JOde() Constructor without parameters
JOde(java.lang.String[] args, java.applet.Applet applet, java.lang.String options) Creates a new JOde instance.
JOde(java.lang.String[] args, java.applet.Applet applet, java.lang.String options, java.awt.Dimension preferredSize) Constructor using command-line-like arguments

Method Summary

Methods

Modifier and Type	Method and Description
void	addControls() Initialize input controls for a slopes diagram
double	evalString(java.lang.String s) Describe evalString method here.
double	evalString(java.lang.String s, boolean silent) Describe evalString method here.
boolean	evaluateAt(double[] y, double[] y1) Implements VField interface.
boolean	evaluateFormulas(com.rychlik.jode.JOde.FormulaControl[] formulaControls, double[] values) Evaluate a sequence of formulas.
java.applet.Applet	getApplet() Get the Applet value.
JOdeFrame	getFrame() Get the Frame value.
java.lang.String	getTitle() Get the Title value.
java.lang.String	initConditionToString(double[] data, boolean isAutonomous) Describe initConditionToString method here.
java.lang.String	initConditionToString(java.lang.String label, double[] data, boolean isAutonomous) Describe initConditionToString method here.
static void	main(java.lang.String[] args) This method allows this class to be run as a standalone application.
double[]	makeInitCondition(com.rychlik.jode.JOde.UserPoint p) Describe makeInitCondition method here.
void	printCanvas() Describe printCanvas method here.
void	printPanel() Describe printPanel method here.
void	printPhaseDiagram() Describe printPhaseDiagram method here.
void	quit() The method quit removes this JODe panel from the applet and the frame and waits to be garbage-collected.
void	run() Run all calculations.
boolean	satisfies(double[] y) Implements Constraints interface.
void	setApplet(java.applet.Applet newApplet) Set the Applet value.
void	setFrame(JOdeFrame newFrame) Set the Frame value.
void	setTitle(java.lang.String newTitle) Set the Title value.
void	showFrame(boolean on) The method showFrame switches the container between the frame and the applet.
void	start() Describe start method here.
void	startCalculation() The startCalculation method initiates the calculation corresponding to the current applet settings.
void	stop() Describe stop method here.
void	stopCalculation() The stopCalculation method stops any running calculation.
void	updateVariableNames() Describe updateVariableNames method here.

Methods inherited from class java.lang.Object

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

Field Detail

USING_FORMAT_FOR_TICKS

public static final boolean USING_FORMAT_FOR_TICKS

If set, DecimalFormat is used to format tick labels. Unfortunately, before Java 2 no exponential formatting can be performed, so formatting tick labels is done by an added hack.

See Also:

Constant Field Values

RANGE_MIN

public static final int RANGE_MIN

Constant RANGE_MIN represents the default for minimum of the range of a variable.

See Also:

Constant Field Values

RANGE_MAX

public static final int RANGE_MAX

Constant RANGE_MAX represents the default for maximum of the range of a variable.

See Also:

Constant Field Values

MAX_STEPS_THRESHOLD

public static final int MAX_STEPS_THRESHOLD

Constant MAX_STEPS_THRESHOLD is the maximal number of steps for numerical solvers.

See Also:

Constant Field Values

ABSCISSA

public static final int ABSCISSA

Constant ABSCISSA is the number of the axis which will be the abscissa of the coordinate system in the default GUI configuration.

See Also:

Constant Field Values

ORDINATE

public static final int ORDINATE

Constant ORDINATE is the number of the axis which will be the ordinate of the coordinate system in the default GUI configuration.

See Also:

Constant Field Values

Constructor Detail

JOde

public JOde(java.lang.String[] args,
    java.applet.Applet applet,
    java.lang.String options,
    java.awt.Dimension preferredSize)

Constructor using command-line-like arguments

Parameters:

args - a String value

applet - an Applet value

options - a String value

preferredSize - a Dimension value

JOde

public JOde(java.lang.String[] args,
    java.applet.Applet applet,
    java.lang.String options)

Creates a new JOde instance.

Parameters:

args - a String value

applet - an Applet value

options - a String value

JOde

public JOde()

Constructor without parameters

Method Detail

start

public void start()

Describe start method here.

stop

public void stop()

Describe stop method here.

evalString

public final double evalString(java.lang.String s)
                        throws ParseException

Describe evalString method here.

Parameters:

s - a String value

Returns:

a double value

Throws:

ParseException - if an error occurs

evalString

public final double evalString(java.lang.String s,
                boolean silent)
                        throws ParseException

Describe evalString method here.

Parameters:

s - a String value

silent - a boolean value

Returns:

a double value

Throws:

ParseException - if an error occurs

satisfies

public boolean satisfies(double[] y)

Implements Constraints interface. Checks whether a point is in the coordinate range.

Specified by:

satisfies in interface Constraints

Parameters:

y - The point in the phase space.

Returns:

True if it is, false if not.

evaluateAt

public final boolean evaluateAt(double[] y,
                 double[] y1)

Implements VField interface.

Specified by:

evaluateAt in interface VField

Parameters:

y - Point where to evaluate vector field.

y1 - Vector field.

Returns:

True, if successfully evaluated, false if it could not be evaluated.

evaluateFormulas

public final boolean evaluateFormulas(com.rychlik.jode.JOde.FormulaControl[] formulaControls,
                       double[] values)

Evaluate a sequence of formulas.

Parameters:

formulaControls - a FormulaControl value

values - a double[] value

Returns:

True, if successfully evaluated, false if at least one of the formulas could not be evaluated.

run

public void run()

Run all calculations.

Specified by:

run in interface java.lang.Runnable

updateVariableNames

public void updateVariableNames()

Describe updateVariableNames method here.

makeInitCondition

public double[] makeInitCondition(com.rychlik.jode.JOde.UserPoint p)

Describe makeInitCondition method here.

Parameters:

p - an UserPoint value

Returns:

a double[] value

addControls

public void addControls()

Initialize input controls for a slopes diagram

printCanvas

public final void printCanvas()

Describe printCanvas method here.

printPanel

public final void printPanel()

Describe printPanel method here.

printPhaseDiagram

public final void printPhaseDiagram()

Describe printPhaseDiagram method here.

showFrame

public final void showFrame(boolean on)

The method showFrame switches the container between the frame and the applet. An instructive message is displayed in the applet window if the frame is used with an applet.

Parameters:

on - a boolean value

initConditionToString

public final java.lang.String initConditionToString(double[] data,
                                     boolean isAutonomous)

Describe initConditionToString method here.

Parameters:

data - a double[] value

isAutonomous - a boolean value

Returns:

a String value

initConditionToString

public final java.lang.String initConditionToString(java.lang.String label,
                                     double[] data,
                                     boolean isAutonomous)

Describe initConditionToString method here.

Parameters:

label - a String value

data - a double[] value

isAutonomous - a boolean value

Returns:

a String value

getFrame

public JOdeFrame getFrame()

Get the Frame value.

Returns:

the Frame value.

setFrame

public void setFrame(JOdeFrame newFrame)

Set the Frame value.

Parameters:

newFrame - The new Frame value.

getApplet

public java.applet.Applet getApplet()

Get the Applet value.

Returns:

the Applet value.

setApplet

public void setApplet(java.applet.Applet newApplet)

Set the Applet value.

Parameters:

newApplet - The new Applet value.

getTitle

public java.lang.String getTitle()

Get the Title value.

Returns:

the Title value.

setTitle

public void setTitle(java.lang.String newTitle)

Set the Title value.

Parameters:

newTitle - The new Title value.

quit

public void quit()

The method quit removes this JODe panel from the applet and the frame and waits to be garbage-collected.

startCalculation

public void startCalculation()

The startCalculation method initiates the calculation corresponding to the current applet settings.

stopCalculation

public void stopCalculation()

The stopCalculation method stops any running calculation.

main

public static void main(java.lang.String[] args)

This method allows this class to be run as a standalone application.

Parameters:

args - Command line arguments.