Class HSApplet

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Panel
                    |
                    +--java.applet.Applet
                          |
                          +--BaseApplet
                                |
                                +--BaseApplet2
                                      |
                                      +--TimeDep
                                            |
                                            +--HSApplet

public class HSApplet

extends TimeDep

implements TimeDependent

Applet to demonstrate the Haynes-Shockley experiment. The function is animated as it changes over time. Graphs are provided, plotting the integral of the function, and the function seen by an observer at some fixed point; both of these are plotted with respect to time.

See Also:

Serialized Form

Inner classes inherited from class BaseApplet2

BaseApplet2.FixedButton, BaseApplet2.FixedCheckbox, BaseApplet2.GraphClickListener

Inner classes inherited from class BaseApplet

BaseApplet.MozillaWorkaround, BaseApplet.ResizeListener

Inner classes inherited from class java.awt.Component

java.awt.Component.AWTTreeLock

Field Summary

protected TimeGraph	integral
protected Plotter	intPlotter
protected java.awt.TextField	lifetimeField
protected int	observations The number of time samples before the graphs "wrap around"
protected TimeGraph	observer
protected java.awt.TextField	obsField
protected BaseApplet2.GraphClickListener	obsListener Listener to detect changes in the position of the observer.
protected double	obsMax The largest value "seen" so far at the observation point
protected Plotter	obsPlotter
protected int	obsPoint The array index corresponding to the observation point
protected double	obsWidth The width of the observed gaussian, or zero if unknown
protected double	obsX The selected observation point
protected double	startIntegral The integral at the start of the simulation

Fields inherited from class TimeDep

anim, animButton, AXES_COL, DEFAULT_NWELLS, DEFAULT_STEPS, depthField, dt, dtField, dx, dxField, ENERGY_COL, energyField, eqn, fnStartField, fnWidthField, function, intWidth, intWidthField, nWellsField, plotter, POT_COL, potPlotter, quadBox, quadFunction, resetButton, stepButton, steps, WAVE_FN_COL, WELL_BOUNDS_COL, widthField

Fields inherited from class BaseApplet2

boxes, buttons, enablePrompt, fields, focus, panel, statusLabel, useSwing, V_MARGIN

Fields inherited from class BaseApplet

buffer, GRAPH_MARGIN, refresh, resizeListener, safetyLimit, useBuffer

Fields inherited from class java.applet.Applet

serialVersionUID, stub

Fields inherited from class java.awt.Panel

base, nameCounter, serialVersionUID

Fields inherited from class java.awt.Container

component, containerListener, containerSerializedDataVersion, dispatcher, layoutMgr, maxSize, ncomponents, serialVersionUID

Fields inherited from class java.awt.Component

actionListenerK, adjustmentListenerK, appContext, assert, background, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, changeSupport, componentListener, componentListenerK, componentOrientation, componentSerializedDataVersion, containerListenerK, cursor, dropTarget, enabled, eventMask, focusListener, focusListenerK, font, foreground, hasFocus, height, incRate, inputMethodListener, inputMethodListenerK, isInc, isPacked, itemListenerK, keyListener, keyListenerK, LEFT_ALIGNMENT, locale, LOCK, minSize, mouseListener, mouseListenerK, mouseMotionListener, mouseMotionListenerK, name, nameExplicitlySet, newEventsOnly, ownedWindowK, parent, peer, peerFont, popups, prefSize, RIGHT_ALIGNMENT, serialVersionUID, textListenerK, TOP_ALIGNMENT, valid, visible, width, windowListenerK, x, y

Constructor Summary

HSApplet()

Method Summary

void	_init() Performs initialisation specific to the Haynes-Shockley experiment, not required by the time-dependent Schrodinger applet.
protected void	addControls() Adds GUI components to this applet.
void	advanceOnce() Performs one step of the simulation, and updates the graphs to reflect the changes.
TimeDepSchrodinger	createEqn() Returns the model to be used for this applet.
void	doPaint(java.awt.Graphics g) Called by forcePaint() to actually perform the painting.
double	getObservedWidth() Attempts to calculate the width of the (skewed) gaussian seen by the observer.
double	getT() Returns the time elapsed in the model.
void	init() Performs extra initialisation, including adding a panel to the bottom of the applet.
protected boolean	reset() Stops any running animation, resets the model to the initial function, and clears the graphs.
void	setObsX(double d) Sets the observation point.
void	start() Applets should use this method to perform any final initialisation necessary to "activate" the applet
void	stop() When this method is called, the applet should cease any user interaction.
void	updateInput() Reads in (and validates) input from the text fields.

Methods inherited from class TimeDep

_paint, actionPerformed, animate, killAnimation, step, validateInput

Methods inherited from class BaseApplet2

add, add, addButton, addCheckbox, addField, addField, addField, addListeners, focusGained, focusLost, getDouble, getGraphHeight, getInt, lockControls, makeButton, makePanel, paintDashedLineH, paintDashedLineV, register, removeListeners, setComponentsEnabled, setLayout, setPromptEnabled, textValueChanged, toString, unlockControls

Methods inherited from class BaseApplet

changeFont, forcePaint, getAppletInfo, getParameterInfo, itemStateChanged, paint, refresh, update

Methods inherited from class java.applet.Applet

destroy, getAppletContext, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, isActive, newAudioClip, play, play, resize, resize, setStub, showStatus

Methods inherited from class java.awt.Panel

, addNotify, constructComponentName

Methods inherited from class java.awt.Container

add, add, add, add, addContainerListener, addImpl, applyOrientation, countComponents, deliverEvent, dispatchEventImpl, dispatchEventToSelf, doLayout, eventEnabled, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents_NoClientCode, getComponents, getCursorTarget, getInsets, getLayout, getMaximumSize, getMinimumSize, getMouseEventTarget, getPreferredSize, getWindow, initIDs, insets, invalidate, invalidateTree, isAncestorOf, layout, lightweightPrint, list, list, locate, minimumSize, nextFocus, paintComponents, paramString, postProcessKeyEvent, postsOldMouseEvents, preferredSize, preProcessKeyEvent, print, printComponents, printOneComponent, processContainerEvent, processEvent, proxyEnableEvents, proxyRequestFocus, readObject, remove, remove, removeAll, removeContainerListener, removeNotify, setCursor, setFocusOwner, setFont, transferFocus, updateCursor, validate, validateTree, writeObject

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, areInputMethodsEnabled, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont_NoClientCode, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputContext, getInputMethodRequests, getIntrinsicCursor, getLocation, getLocation, getLocationOnScreen, getName, getNativeContainer, getParent_NoClientCode, getParent, getPeer, getSize, getSize, getToolkit, getToolkitImpl, getTreeLock, getWidth, getWindowForObject, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isEnabledImpl, 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, processComponentEvent, processFocusEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

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

Field Detail

obsListener

protected BaseApplet2.GraphClickListener obsListener

Listener to detect changes in the position of the observer.

obsX

protected double obsX

The selected observation point

obsMax

protected double obsMax

The largest value "seen" so far at the observation point

startIntegral

protected double startIntegral

The integral at the start of the simulation

obsWidth

protected double obsWidth

The width of the observed gaussian, or zero if unknown

lifetimeField

protected java.awt.TextField lifetimeField

obsField

protected java.awt.TextField obsField

integral

protected TimeGraph integral

observer

protected TimeGraph observer

observations

protected int observations

The number of time samples before the graphs "wrap around"

obsPoint

protected int obsPoint

The array index corresponding to the observation point

intPlotter

protected Plotter intPlotter

obsPlotter

protected Plotter obsPlotter

Constructor Detail

HSApplet

public HSApplet()

Method Detail

init

public void init()

Description copied from class: BaseApplet2

Performs extra initialisation, including adding a panel to the bottom of the applet.

Overrides:

init in class TimeDep

_init

public void _init()

Performs initialisation specific to the Haynes-Shockley experiment, not required by the time-dependent Schrodinger applet.

Overrides:

_init in class TimeDep

createEqn

public TimeDepSchrodinger createEqn()

Returns the model to be used for this applet.

Overrides:

createEqn in class TimeDep

addControls

protected void addControls()

Adds GUI components to this applet. Components required by the time-dependent Schrodinger applet but not required here will be created and initialised (to satisfy input validation requirements), but will be hidden from view.

Overrides:

addControls in class TimeDep

start

public void start()

Description copied from class: BaseApplet

Applets should use this method to perform any final initialisation necessary to "activate" the applet

Overrides:

start in class TimeDep

stop

public void stop()

Description copied from class: BaseApplet

When this method is called, the applet should cease any user interaction. In particular, any threads explicitly started should be stopped, any external resources should be closed. This method should negate the action of start().

Overrides:

stop in class TimeDep

updateInput

public void updateInput()

Reads in (and validates) input from the text fields.

Overrides:

updateInput in class TimeDep

Throws:

java.lang.IllegalArgumentException - if any input fields are invalid

advanceOnce

public void advanceOnce()

Performs one step of the simulation, and updates the graphs to reflect the changes.

Specified by:

advanceOnce in interface TimeDependent

Overrides:

advanceOnce in class TimeDep

getT

public double getT()

Returns the time elapsed in the model.

Specified by:

getT in interface TimeDependent

Overrides:

getT in class TimeDep

reset

protected boolean reset()

Stops any running animation, resets the model to the initial function, and clears the graphs.

Overrides:

reset in class TimeDep

Tags copied from class: TimeDep

Returns:

true if initialisation succeeded, false if there was an input validation error

doPaint

public void doPaint(java.awt.Graphics g)

Description copied from class: BaseApplet

Called by forcePaint() to actually perform the painting. Subclasses should implement this method as if it were the standard paint() method; buffering will then take place transparently.

Overrides:

doPaint in class TimeDep

Tags copied from class: BaseApplet

Parameters:

g - The Graphics object on which to paint

getObservedWidth

public double getObservedWidth()

Attempts to calculate the width of the (skewed) gaussian seen by the observer.

Returns:

The width of the gaussian, or zero if there is not enough data

setObsX

public void setObsX(double d)

Sets the observation point. The value of the function at this point will be plotted against time on the lower-right graph.