Class LatticeApplet

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Panel
                    |
                    +--java.applet.Applet
                          |
                          +--BaseApplet
                                |
                                +--LatticeApplet

public class LatticeApplet

extends BaseApplet

Applet to illustrate the idea of lattice vectors. Two draggable vectors are provided, and a "grid" of bases is drawn according to these base vectors.

The basis may be chosen from a list of simple geometric figures; to add to these, override or edit makeBases() to add the basis to the list, and override or edit makeLabels() to supply a label for the basis. The position in the array of the new label should match that of the new basis.

See Also:

Serialized Form

Inner Class Summary

protected class

LatticeApplet.VectorMoveListener Listener to detect changes in the positions of the lattice vectors.

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 java.awt.Label	angle
protected Lattice2D.Basis[]	bases A list of all available bases
protected java.awt.Checkbox[]	boxes A checkbox for each basis
protected java.awt.CheckboxGroup	cbg Ensures that exactly one basis will be selected
protected java.lang.String[]	labels Names for all available bases
protected java.awt.Point	lastPos
protected Lattice2D	lattice The lattice itself
static double	MIN_SPACING The minimum modulus (in pixels) permitted for the lattice vectors.
protected java.awt.Label	mod1
protected java.awt.Label	mod2
protected java.awt.Label	ratio
protected Lattice2D	reciprocal The lattice itself
protected java.awt.Panel	rightPanel Container to hold all the GUI components.
protected LatticeApplet.VectorMoveListener	vectorMoveListener Listener for changes in the vectors.

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

LatticeApplet()

Method Summary

void	actionPerformed(java.awt.event.ActionEvent ae) Subclasses should at least provide an empty implementation of this method.
void	addWithLabel(java.awt.Panel root, java.awt.Component c, java.lang.String label) Helper method to add a component with a label.
java.awt.Point	chooseWindowPos(int w, int h, int wndW, int wndH)
int	displayWidth() Calculates the width of the area available for the lattice display
void	doPaint(java.awt.Graphics g) Called by forcePaint() to actually perform the painting.
void	init() Performs extra intialisation specific to this class
Lattice2D.Basis[]	makeBases(Lattice2D l) Returns an array of all available bases.
java.lang.String[]	makeLabels() Returns an array of labels for all available bases.
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.
protected java.lang.String	toString(double d) Helper method to format a double for display in a text label.
void	updateLabels() Updates the numerical information displayed to the right of the applet (vector lengths, length ratio, angle between vectors).
void	updateReciprocal()

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, 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, setLayout, 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

lastPos

protected java.awt.Point lastPos

lattice

protected Lattice2D lattice

The lattice itself

reciprocal

protected Lattice2D reciprocal

The lattice itself

vectorMoveListener

protected LatticeApplet.VectorMoveListener vectorMoveListener

Listener for changes in the vectors.

angle

protected java.awt.Label angle

mod1

protected java.awt.Label mod1

mod2

protected java.awt.Label mod2

ratio

protected java.awt.Label ratio

labels

protected java.lang.String[] labels

Names for all available bases

bases

protected Lattice2D.Basis[] bases

A list of all available bases

boxes

protected java.awt.Checkbox[] boxes

A checkbox for each basis

cbg

protected java.awt.CheckboxGroup cbg

Ensures that exactly one basis will be selected

rightPanel

protected java.awt.Panel rightPanel

Container to hold all the GUI components. Will be positioned to the right of the applet using BorderLayout.

MIN_SPACING

public static final double MIN_SPACING

The minimum modulus (in pixels) permitted for the lattice vectors. This prevents the vectors from becoming too small to see, but does not restrict the lattices available, as the vectors may still be positioned arbitrarily close together.

(The one exception to this rule is that it is no longer to create the degnerate lattice which is collapsed onto zero dimensions. This lattice is produced if and only if v1 = v2 = 0.)

Constructor Detail

LatticeApplet

public LatticeApplet()

Method Detail

init

public void init()

Description copied from class: BaseApplet

Performs extra intialisation specific to this class

Overrides:

init in class BaseApplet

addWithLabel

public void addWithLabel(java.awt.Panel root,
                         java.awt.Component c,
                         java.lang.String label)

Helper method to add a component with a label.

Parameters:

root - The Panel to which the component and label should be added

c - The component to be added

label - The text label for the component

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 BaseApplet

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 BaseApplet

displayWidth

public int displayWidth()

Calculates the width of the area available for the lattice display

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 BaseApplet

Tags copied from class: BaseApplet

Parameters:

g - The Graphics object on which to paint

chooseWindowPos

public java.awt.Point chooseWindowPos(int w,
                                      int h,
                                      int wndW,
                                      int wndH)

updateLabels

public void updateLabels()

Updates the numerical information displayed to the right of the applet (vector lengths, length ratio, angle between vectors).

toString

protected java.lang.String toString(double d)

Helper method to format a double for display in a text label.

actionPerformed

public void actionPerformed(java.awt.event.ActionEvent ae)

Description copied from class: BaseApplet

Subclasses should at least provide an empty implementation of this method.

Overrides:

actionPerformed in class BaseApplet

updateReciprocal

public void updateReciprocal()

makeLabels

public java.lang.String[] makeLabels()

Returns an array of labels for all available bases.

makeBases

public Lattice2D.Basis[] makeBases(Lattice2D l)

Returns an array of all available bases.