Class BaseApplet

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

All Implemented Interfaces:

javax.accessibility.Accessible, java.util.EventListener, java.awt.image.ImageObserver, java.awt.MenuContainer, java.awt.event.MouseListener, java.awt.event.MouseMotionListener, java.lang.Runnable, java.io.Serializable

Direct Known Subclasses:

BreadthFirstApplet

public class BaseApplet

extends java.applet.Applet

implements java.lang.Runnable, java.awt.event.MouseListener, java.awt.event.MouseMotionListener

BaseApplet with methods intended to be over-ridden to create games, etc.

See Also:

Serialized Form

Field Summary

protected java.awt.Color	backgroundColor
protected int	currentDelay
protected java.awt.Color	foregroundColor
protected java.awt.Image	image
protected java.lang.Thread	myThread
protected java.awt.Graphics	offScreen

Fields inherited from class java.applet.Applet

Fields inherited from class java.awt.Panel

Fields inherited from class java.awt.Container

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

BaseApplet()

Method Summary

void	clearOffScreenBuffer() Clear the off-screen buffer.
boolean	continueRunning() Over-ride this in the derived class.
(package private) void	createOffScreenBuffer() Create the off-screen buffer.
void	init() Initialize the applet.
void	mouseClicked(java.awt.event.MouseEvent e) These are required for implementing MouseListener.
void	mouseDragged(java.awt.event.MouseEvent e)
void	mouseEntered(java.awt.event.MouseEvent e)
void	mouseExited(java.awt.event.MouseEvent e)
void	mouseMoved(java.awt.event.MouseEvent e) These are required for implementing MouseMotionListener.
void	mousePressed(java.awt.event.MouseEvent e)
void	mouseReleased(java.awt.event.MouseEvent e)
void	paint(java.awt.Graphics g) paint(Graphics) is is called by update(Graphics).
(package private) void	paintBuffer() Paint the off-screen buffer onto the screen
void	run() Run the applet by running its thread.
void	setDelay(int delay) Set the current delay value in milliseconds.
void	sleep() Sleep for the amount specified in current delay.
void	sleep(int amount) Sleep for a specified number of milliseconds.
void	start() Start the applet.
void	step() Over-ride this in the derived class.
void	update(java.awt.Graphics g) update is implicitly called by repaint() It calls paint(Graphics).

Methods inherited from class java.applet.Applet

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

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFont, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, 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, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Field Detail

backgroundColor

protected java.awt.Color backgroundColor

foregroundColor

protected java.awt.Color foregroundColor

currentDelay

protected int currentDelay

myThread

protected java.lang.Thread myThread

image

protected java.awt.Image image

offScreen

protected java.awt.Graphics offScreen

Constructor Detail

BaseApplet

public BaseApplet()

Method Detail

init

public void init()

Initialize the applet. Can be over-ridden in a derived class, but if so, the over-riding method should call super.init();.

Overrides:

init in class java.applet.Applet

start

public void start()

Start the applet. Called when the applet is first started and when the web-page is re-entered.

Overrides:

start in class java.applet.Applet

run

public void run()

Run the applet by running its thread. This over-rides the run() method in class Applet.

Specified by:

run in interface java.lang.Runnable

sleep

public void sleep()

Sleep for the amount specified in current delay.

sleep

public void sleep(int amount)

Sleep for a specified number of milliseconds.

setDelay

public void setDelay(int delay)

Set the current delay value in milliseconds.

createOffScreenBuffer

void createOffScreenBuffer()

Create the off-screen buffer.

clearOffScreenBuffer

public void clearOffScreenBuffer()

Clear the off-screen buffer.

update

public void update(java.awt.Graphics g)

update is implicitly called by repaint() It calls paint(Graphics). This method intentionally over-rides update() in class Applet so that the background is not blanked, which will tend to cause flicker. It is probably best not to change this unless you really know what you are doing.

Overrides:

update in class java.awt.Container

paint

public void paint(java.awt.Graphics g)

paint(Graphics) is is called by update(Graphics). This is where the off-screen buffer gets painted to the screen. image contains the Graphics for what is to be painted. It is probably best not to change this unless you really know what you are doing.

Overrides:

paint in class java.awt.Container

continueRunning

public boolean continueRunning()

Over-ride this in the derived class. It gives the condition under which the applet will continue calling step in the main loop.

step

public void step()

Over-ride this in the derived class. It indicates what the will be done as a single step in the main loop.

paintBuffer

void paintBuffer()

Paint the off-screen buffer onto the screen

mouseClicked

public void mouseClicked(java.awt.event.MouseEvent e)

These are required for implementing MouseListener. They can be over-ridden in a derived class at your option.

Specified by:

mouseClicked in interface java.awt.event.MouseListener

mousePressed

public void mousePressed(java.awt.event.MouseEvent e)

Specified by:

mousePressed in interface java.awt.event.MouseListener

mouseReleased

public void mouseReleased(java.awt.event.MouseEvent e)

Specified by:

mouseReleased in interface java.awt.event.MouseListener

mouseEntered

public void mouseEntered(java.awt.event.MouseEvent e)

Specified by:

mouseEntered in interface java.awt.event.MouseListener

mouseExited

public void mouseExited(java.awt.event.MouseEvent e)

Specified by:

mouseExited in interface java.awt.event.MouseListener

mouseMoved

public void mouseMoved(java.awt.event.MouseEvent e)

These are required for implementing MouseMotionListener. They can be over-ridden in a derived class at your option.

Specified by:

mouseMoved in interface java.awt.event.MouseMotionListener

mouseDragged

public void mouseDragged(java.awt.event.MouseEvent e)

Specified by:

mouseDragged in interface java.awt.event.MouseMotionListener