mathapps
Class FFT

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Panel
                    |
                    +--java.applet.Applet
                          |
                          +--edu.davidson.tools.SApplet
                                |
                                +--mathapps.FFT

All Implemented Interfaces:

javax.accessibility.Accessible, java.awt.image.ImageObserver, java.awt.MenuContainer, edu.davidson.tools.SDataSource, java.io.Serializable, edu.davidson.tools.SStepable

public class FFT

extends SApplet

implements edu.davidson.tools.SDataSource, edu.davidson.tools.SStepable

The FFT Physlet evaluates a function at a predetermined number of points and computes the Fast Fourier Transfprm, FFT. The range of the indexpendent variable can be set using the Min and Max embedding parameters. The number of points can be set with the NumPts parameter.

See Also:

Serialized Form

Fields inherited from class edu.davidson.tools.SApplet

clock, dataConnections, dataListeners, dataSources, lock

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

FFT()

Method Summary

java.lang.String	getAppletInfo()
int	getFunctionID()
java.lang.String	getFunctionStr(java.lang.String string)
SApplet	getOwner() Data source method.
java.lang.String	getParameter(java.lang.String key, java.lang.String def)
java.lang.String[][]	getParameterInfo()
double[][]	getVariables() Data source method.
java.lang.String[]	getVarStrings() Data source method.
void	init()
static void	main(java.lang.String[] args)
void	reset() Reset the applet to time =0.
void	setAutoRefresh(boolean refresh) Inhibit or enable the fft calcuation.
void	setDefault() Delete the data connections and set the time to zero.
boolean	setFunction(java.lang.String function, java.lang.String variable) Set the function string and the independent variable.
boolean	setFunctionStr(java.lang.String function) Set the function string.
void	setMinMax(double min_, double max_) Set the minimum and maximum values sorted by the histogram.
void	setNumPts(int n) Set the number of grid points.
void	setOwner(SApplet owner) Data source method.
void	setShowDC(boolean set) Show or hide the zero frequency component.
void	step(double dt, double time) Step the time.

Methods inherited from class edu.davidson.tools.SApplet

addDataListener, addDataSource, cleanupDataConnections, clearAllData, clearData, deleteDataConnection, deleteDataConnections, destroy, forward, getClockID, getClockTime, getDataConnectionFromDL, getDataConnectionFromDS, getDataFromDS, getDataListener, getDataListener, getDataSource, getDataSource, getID, getRunningID, getSourceData, getSourceVariables, isAutoRefresh, isClockRunning, makeDataConnection, pause, removeDataListener, removeDataSource, reverse, setClockContinous, setClockCycle, setClockOneShot, setClockTime, setConnectionBlock, setConnectionListener, setConnectionSmoothing, setConnectionSource, setConnectionStride, setDt, setExternalClock, setFPS, setRunningID, setRunningID, setTimeContinuous, setTimeCycle, setTimeOneShot, startClock, stepClock, stepTime, stepTimeBack, stepTimeForward, stopClock, updateDataConnection, updateDataConnections

Methods inherited from class java.applet.Applet

getAccessibleContext, getAppletContext, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, isActive, newAudioClip, play, play, resize, resize, setStub, showStatus, start, stop

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, remove, remove, removeAll, removeContainerListener, removeNotify, setFont, setLayout, update, validate

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, contains, contains, createImage, createImage, disable, dispatchEvent, enable, enable, enableInputMethods, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getInputContext, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface edu.davidson.tools.SDataSource

getID

Constructor Detail

FFT

public FFT()

Method Detail

getAppletInfo

public java.lang.String getAppletInfo()

Overrides:

getAppletInfo in class java.applet.Applet

getFunctionID

public int getFunctionID()

getFunctionStr

public java.lang.String getFunctionStr(java.lang.String string)

getOwner

public SApplet getOwner()

Data source method. DO NOT SCRIPT.

Specified by:

getOwner in interface edu.davidson.tools.SDataSource

getParameter

public java.lang.String getParameter(java.lang.String key,
                                     java.lang.String def)

getParameterInfo

public java.lang.String[][] getParameterInfo()

Overrides:

getParameterInfo in class java.applet.Applet

getVariables

public double[][] getVariables()

Data source method. DO NOT SCRIPT.

Specified by:

getVariables in interface edu.davidson.tools.SDataSource

getVarStrings

public java.lang.String[] getVarStrings()

Data source method. DO NOT SCRIPT.

Specified by:

getVarStrings in interface edu.davidson.tools.SDataSource

init

public void init()

Overrides:

init in class java.applet.Applet

main

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

reset

public void reset()

Reset the applet to time =0.

Overrides:

reset in class SApplet

setAutoRefresh

public void setAutoRefresh(boolean refresh)

Inhibit or enable the fft calcuation. Inhibit auto refresh if a number of parameters are to be changed.

Overrides:

setAutoRefresh in class SApplet

Following copied from class: edu.davidson.tools.SApplet

Parameters:

autoRefresh - Automatic repaint?

setDefault

public void setDefault()

Delete the data connections and set the time to zero.

Overrides:

setDefault in class SApplet

setFunction

public boolean setFunction(java.lang.String function,
                           java.lang.String variable)

Set the function string and the independent variable.

Parameters:

function - the function string

variable - the independent variable

Returns:

true if the string is a valid function.

setFunctionStr

public boolean setFunctionStr(java.lang.String function)

Set the function string.

Parameters:

function - the function string

Returns:

true if the string is a valid function.

setMinMax

public void setMinMax(double min_,
                      double max_)

Set the minimum and maximum values sorted by the histogram.

setNumPts

public void setNumPts(int n)

Set the number of grid points.

setOwner

public void setOwner(SApplet owner)

Data source method. DO NOT SCRIPT.

Specified by:

setOwner in interface edu.davidson.tools.SDataSource

setShowDC

public void setShowDC(boolean set)

Show or hide the zero frequency component. The dc compent will be included in the fft if this flag is true.

Parameters:

set - true to show the dc component

step

public void step(double dt,
                 double time)

Step the time. DO NOT SCRIPT. This function is called by the animation clock.

Specified by:

step in interface edu.davidson.tools.SStepable