: Class DrawArea

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edu.virginia.cs.mng.hypercast.demo
Class DrawArea

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.JPanel
                          |
                          +--edu.virginia.cs.mng.hypercast.demo.DrawArea

public class DrawArea
extends javax.swing.JPanel

DrawArea class: the class used to draw on.

See Also:: Serialized Form

Inner classes inherited from class javax.swing.JPanel

javax.swing.JPanel.AccessibleJPanel

Inner classes inherited from class javax.swing.JComponent

javax.swing.JComponent.AccessibleJComponent,  
javax.swing.JComponent.IntVector,  
javax.swing.JComponent.KeyboardBinding,  
javax.swing.JComponent.KeyboardState

Inner classes inherited from class java.awt.Component

java.awt.Component.AWTTreeLock

Field Summary
`(package private) boolean`	`bCanDrawText`
`(package private) int`	`dragx` Used to record the intermediate coordinates when you are dragging the mouse.
`(package private) int`	`dragy` Used to record the intermediate coordinates when you are dragging the mouse.
`(package private) boolean`	`firsttime`
`(package private) java.awt.FontMetrics`	`fm`
`(package private) Entry`	`founde` A entry used to indicate a found entry.
`(package private) MGraphics`	`g` MGraphics (derived from Graphics) handle used to draw on.
`(package private) MGraphics`	`gDrag` MGraphics (derived from Graphics) handle used to draw on.
`(package private) MGraphics`	`gOff` MGraphics (derived from Graphics) handle used to draw on.
`(package private) static int`	`HEIGHT`
`(package private) int`	`idragx`
`(package private) int`	`idragy`
`(package private) java.awt.Image`	`imdrag` Image handles used to buffered-draw on.
`(package private) java.awt.Image`	`imoff` Image handles used to buffered-draw on.
`(package private) int`	`initx` The coordinates of the first point of the current entry.
`(package private) int`	`inity` The coordinates of the first point of the current entry.
`(package private) boolean`	`inpoly` Whether in the drawing process of a POLY.
`(package private) int`	`killx` Used to record the coordinates of the first mouse click when you try to KILL an entry.
`(package private) int`	`killy` Used to record the coordinates of the first mouse click when you try to KILL an entry.
`(package private) boolean`	`kludge`
`(package private) long`	`lastdragged` Timestamp used when you draw a BRUSH entry.
`(package private) int`	`lastsize` Used to store text size when you are drawing a TEXT entry.
`(package private) int`	`lastx` The coordinates of the last point of the current entry.
`(package private) int`	`lasty` The coordinates of the last point of the current entry.
`(package private) boolean`	`nuked`
`(package private) int`	`pagenumber` The page number this drawing area is associated with.
`(package private) WBFrame`	`parent` The whiteboard associated with this drawArea.
`(package private) int`	`pointx` The coordinates of the helping point of the current POLY entry.
`(package private) int`	`pointy` The coordinates of the helping point of the current POLY entry.
`(package private) java.util.Vector`	`polyx` Used to store the coordinates of a POLY.
`(package private) java.util.Vector`	`polyy` Used to store the coordinates of a POLY.
`(package private) int`	`scrollx`
`(package private) int`	`scrolly`
`private java.lang.String`	`sPrev`
`(package private) int`	`strx` The coordinates used to calculate the drawing position when you draw a TEXT entry.
`(package private) int`	`stry` The coordinates used to calculate the drawing position when you draw a TEXT entry.
`(package private) static long`	`TIMEVAL`
`(package private) boolean`	`virgin`
`(package private) static int`	`WIDTH`
`(package private) static int`	`xxxxx`

Fields inherited from class javax.swing.JPanel

defaultLayout,  
uiClassID

Fields inherited from class javax.swing.JComponent

_bounds,  
accessibleContext,  
alignmentX,  
alignmentY,  
ANCESTOR_USING_BUFFER,  
ancestorNotifier,  
autoscroller,  
border,  
changeSupport,  
clientProperties,  
flags,  
HAS_FOCUS,  
IS_DOUBLE_BUFFERED,  
IS_OPAQUE,  
IS_PAINTING_TILE,  
KEYBOARD_BINDINGS_KEY,  
listenerList,  
maximumSize,  
minimumSize,  
NEXT_FOCUS,  
paintImmediatelyClip,  
preferredSize,  
readObjectCallbacks,  
REQUEST_FOCUS_DISABLED,  
tmpRect,  
TOOL_TIP_TEXT_KEY,  
ui,  
uiClassID,  
UNDEFINED_CONDITION,  
vetoableChangeSupport,  
WHEN_ANCESTOR_OF_FOCUSED_COMPONENT,  
WHEN_FOCUSED,  
WHEN_IN_FOCUSED_WINDOW

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
`DrawArea(WBFrame p, int pnum)` Constructor.

Method Summary
`void`	`clearEntry(Entry fe)` To clear a given entry from the drawing area of the whiteboard.
`void`	`doLayout()` To initialize the layout of this drawing area.
`void`	`draw(MGraphics g, Entry e)` To draw the given entry on the given Graphics handle.
`void`	`drawTextBox()` To draw the box that surrounds the text when the user is drawing a TEXT entry.
`java.awt.Image`	`getImage()`
`java.awt.Dimension`	`getMaximumSize()` To get the maximun size of this drawing area.
`java.awt.Dimension`	`getMinimumSize()` To get the minimum size of this drawing area.
`java.awt.Dimension`	`getPreferredSize()` To get the preferred size of this drawing area.
`void`	`paintComponent(java.awt.Graphics gg)` To repaint the given Graphics object with overwrite mode.
`void`	`signalfinal()` A peripheral method which help to draw the POLY and TEXT entry.
`void`	`this_keyPressed(java.awt.event.KeyEvent ev)` Event handler invoked when the keyboard is pressed.
`void`	`this_mouseDragged(java.awt.event.MouseEvent ev)` Event handler invoked when the mouse is dragged.
`void`	`this_mouseMoved(java.awt.event.MouseEvent ev)`
`void`	`this_mousePressed(java.awt.event.MouseEvent ev)` Event handler invoked when the mouse is pressed.
`void`	`this_mouseReleased(java.awt.event.MouseEvent ev)` Event handler invoked when the mouse is released.
`void`	`updateGraphics()`

Methods inherited from class javax.swing.JPanel

, 
getAccessibleContext, 
getUIClassID, 
paramString, 
updateUI, 
writeObject

Methods inherited from class javax.swing.JComponent

_paintImmediately, 
addAncestorListener, 
addNotify, 
addPropertyChangeListener, 
addVetoableChangeListener, 
adjustPaintFlags, 
alwaysOnTop, 
bindingForKeyStroke, 
computeVisibleRect, 
computeVisibleRect, 
contains, 
createToolTip, 
enableSerialization, 
firePropertyChange, 
firePropertyChange, 
firePropertyChange, 
firePropertyChange, 
firePropertyChange, 
firePropertyChange, 
firePropertyChange, 
firePropertyChange, 
firePropertyChange, 
fireVetoableChange, 
getActionForKeyStroke, 
getAlignmentX, 
getAlignmentY, 
getAutoscrolls, 
getBorder, 
getBounds, 
getClientProperties, 
getClientProperty, 
getComponentGraphics, 
getConditionForKeyStroke, 
getDebugGraphicsOptions, 
getFlag, 
getGraphics, 
getHeight, 
getInsets, 
getInsets, 
getLocation, 
getNextFocusableComponent, 
getRegisteredKeyStrokes, 
getRootPane, 
getSize, 
getToolTipLocation, 
getToolTipText, 
getToolTipText, 
getTopLevelAncestor, 
getVisibleRect, 
getWidth, 
getX, 
getY, 
grabFocus, 
hasFocus, 
isDoubleBuffered, 
isFocusCycleRoot, 
isFocusTraversable, 
isLightweightComponent, 
isManagingFocus, 
isOpaque, 
isOptimizedDrawingEnabled, 
isPaintingTile, 
isRequestFocusEnabled, 
isValidateRoot, 
keyboardBindings, 
paint, 
paintBorder, 
paintChildren, 
paintImmediately, 
paintImmediately, 
paintWithBuffer, 
processComponentKeyEvent, 
processFocusEvent, 
processKeyBinding, 
processKeyBindings, 
processKeyBindingsForAllComponents, 
processKeyEvent, 
processMouseMotionEvent, 
putClientProperty, 
readObject, 
rectangleIsObscured, 
registerKeyboardAction, 
registerKeyboardAction, 
registerWithKeyboardManager, 
removeAncestorListener, 
removeNotify, 
removePropertyChangeListener, 
removeVetoableChangeListener, 
repaint, 
repaint, 
requestDefaultFocus, 
requestFocus, 
resetKeyboardActions, 
reshape, 
revalidate, 
scrollRectToVisible, 
setAlignmentX, 
setAlignmentY, 
setAutoscrolls, 
setBackground, 
setBorder, 
setDebugGraphicsOptions, 
setDoubleBuffered, 
setEnabled, 
setFlag, 
setFont, 
setForeground, 
setMaximumSize, 
setMinimumSize, 
setNextFocusableComponent, 
setOpaque, 
setPreferredSize, 
setRequestFocusEnabled, 
setToolTipText, 
setUI, 
setVisible, 
shouldDebugGraphics, 
superProcessMouseMotionEvent, 
unregisterKeyboardAction, 
unregisterWithKeyboardManager, 
update

Methods inherited from class java.awt.Container

add, 
add, 
add, 
add, 
add, 
addContainerListener, 
addImpl, 
applyOrientation, 
countComponents, 
deliverEvent, 
dispatchEventImpl, 
dispatchEventToSelf, 
eventEnabled, 
findComponentAt, 
findComponentAt, 
getComponent, 
getComponentAt, 
getComponentAt, 
getComponentCount, 
getComponents_NoClientCode, 
getComponents, 
getLayout, 
getMouseEventTarget, 
getWindow, 
initIDs, 
insets, 
invalidate, 
invalidateTree, 
isAncestorOf, 
layout, 
lightweightPrint, 
list, 
list, 
locate, 
minimumSize, 
nextFocus, 
paintComponents, 
postProcessKeyEvent, 
postsOldMouseEvents, 
preferredSize, 
preProcessKeyEvent, 
print, 
printComponents, 
printOneComponent, 
processContainerEvent, 
processEvent, 
proxyEnableEvents, 
proxyRequestFocus, 
remove, 
remove, 
removeAll, 
removeContainerListener, 
setFocusOwner, 
setLayout, 
transferFocus, 
validate, 
validateTree

Methods inherited from class java.awt.Component

action, 
add, 
addComponentListener, 
addFocusListener, 
addInputMethodListener, 
addKeyListener, 
addMouseListener, 
addMouseMotionListener, 
addPropertyChangeListener, 
areInputMethodsEnabled, 
bounds, 
checkImage, 
checkImage, 
coalesceEvents, 
constructComponentName, 
contains, 
createImage, 
createImage, 
disable, 
disableEvents, 
dispatchEvent, 
enable, 
enable, 
enableEvents, 
enableInputMethods, 
getBackground, 
getBounds, 
getColorModel, 
getComponentOrientation, 
getCursor, 
getDropTarget, 
getFont_NoClientCode, 
getFont, 
getFontMetrics, 
getForeground, 
getInputContext, 
getInputMethodRequests, 
getLocale, 
getLocation, 
getLocationOnScreen, 
getName, 
getNativeContainer, 
getParent_NoClientCode, 
getParent, 
getPeer, 
getSize, 
getToolkit, 
getToolkitImpl, 
getTreeLock, 
getWindowForObject, 
gotFocus, 
handleEvent, 
hide, 
imageUpdate, 
inside, 
isDisplayable, 
isEnabled, 
isEnabledImpl, 
isLightweight, 
isShowing, 
isValid, 
isVisible, 
keyDown, 
keyUp, 
list, 
list, 
list, 
location, 
lostFocus, 
mouseDown, 
mouseDrag, 
mouseEnter, 
mouseExit, 
mouseMove, 
mouseUp, 
move, 
nextFocus, 
paintAll, 
postEvent, 
prepareImage, 
prepareImage, 
printAll, 
processComponentEvent, 
processInputMethodEvent, 
processMouseEvent, 
remove, 
removeComponentListener, 
removeFocusListener, 
removeInputMethodListener, 
removeKeyListener, 
removeMouseListener, 
removeMouseMotionListener, 
removePropertyChangeListener, 
repaint, 
repaint, 
repaint, 
resize, 
resize, 
setBounds, 
setBounds, 
setComponentOrientation, 
setCursor, 
setDropTarget, 
setLocale, 
setLocation, 
setLocation, 
setName, 
setSize, 
setSize, 
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

WIDTH

static final int WIDTH

HEIGHT

static final int HEIGHT

TIMEVAL

static final long TIMEVAL

parent

WBFrame parent

The whiteboard associated with this drawArea.

g

MGraphics g

MGraphics (derived from Graphics) handle used to draw on.

gOff

MGraphics gOff

MGraphics (derived from Graphics) handle used to draw on.

gDrag

MGraphics gDrag

MGraphics (derived from Graphics) handle used to draw on.

fm

java.awt.FontMetrics fm

imoff

java.awt.Image imoff

Image handles used to buffered-draw on.

imdrag

java.awt.Image imdrag

Image handles used to buffered-draw on.

initx

int initx

The coordinates of the first point of the current entry.

inity

int inity

The coordinates of the first point of the current entry.

lastx

int lastx

The coordinates of the last point of the current entry.

lasty

int lasty

The coordinates of the last point of the current entry.

pointx

int pointx

The coordinates of the helping point of the current POLY entry. Used to record the intermediate point of a POLY.

pointy

int pointy

The coordinates of the helping point of the current POLY entry. Used to record the intermediate point of a POLY.

dragx

int dragx

Used to record the intermediate coordinates when you are dragging the mouse.

dragy

int dragy

Used to record the intermediate coordinates when you are dragging the mouse.

idragx

int idragx

idragy

int idragy

killx

int killx

Used to record the coordinates of the first mouse click when you try to KILL an entry.

killy

int killy

Used to record the coordinates of the first mouse click when you try to KILL an entry.

lastsize

int lastsize

Used to store text size when you are drawing a TEXT entry.

lastdragged

long lastdragged

Timestamp used when you draw a BRUSH entry.

polyx

java.util.Vector polyx

Used to store the coordinates of a POLY.

polyy

java.util.Vector polyy

Used to store the coordinates of a POLY.

inpoly

boolean inpoly

Whether in the drawing process of a POLY.

virgin

boolean virgin

nuked

boolean nuked

founde

Entry founde

A entry used to indicate a found entry. Used when a MOVE or COPY operation is performed.

strx

int strx

The coordinates used to calculate the drawing position when you draw a TEXT entry.

stry

int stry

The coordinates used to calculate the drawing position when you draw a TEXT entry.

scrollx

int scrollx

scrolly

int scrolly

kludge

boolean kludge

pagenumber

int pagenumber

The page number this drawing area is associated with.

bCanDrawText

boolean bCanDrawText

firsttime

boolean firsttime

sPrev

private java.lang.String sPrev

xxxxx

static int xxxxx

Constructor Detail

DrawArea

public DrawArea(WBFrame p,
                int pnum)

Constructor.

Parameters:: p - the whiteboard assoicated with me.; pnum - page number

Method Detail

doLayout

public void doLayout()

To initialize the layout of this drawing area.

Overrides:: doLayout in class java.awt.Container

updateGraphics

public void updateGraphics()

getMinimumSize

public java.awt.Dimension getMinimumSize()

To get the minimum size of this drawing area. That is (0,0).

Returns:: a Dimension object of (0,0).
Overrides:: getMinimumSize in class javax.swing.JComponent

getMaximumSize

public java.awt.Dimension getMaximumSize()

To get the maximun size of this drawing area.

Returns:: a Dimension object corresopnding to the maximum size.
Overrides:: getMaximumSize in class javax.swing.JComponent

getPreferredSize

public java.awt.Dimension getPreferredSize()

To get the preferred size of this drawing area.

Returns:: a Dimension object corresponding to the preferred size.
Overrides:: getPreferredSize in class javax.swing.JComponent

draw

public void draw(MGraphics g,
                 Entry e)

To draw the given entry on the given Graphics handle. All information needed to draw is store in the entry object. The entry may be BRUSH, TEXT, LINE, RECT, ROUNDRECT, OVAL, POLY, IMAGE.

Parameters:: g - the given Graphics handle.; e - the given entry.

paintComponent

public void paintComponent(java.awt.Graphics gg)

To repaint the given Graphics object with overwrite mode.

Parameters:: g - the given Graphics object.
Overrides:: paintComponent in class javax.swing.JComponent

clearEntry

public void clearEntry(Entry fe)

To clear a given entry from the drawing area of the whiteboard. The entry is not remove from internal data structure (a vector) by this method.

Parameters:: fe - the given entry to be cleared.

drawTextBox

public void drawTextBox()

To draw the box that surrounds the text when the user is drawing a TEXT entry.

this_mousePressed

public void this_mousePressed(java.awt.event.MouseEvent ev)

Event handler invoked when the mouse is pressed. It is very important. Whenever the mouse is pressed, a new piece of drawing is beginning, thus an new entry is being created. To create the new entry, its internal data structures are being created in this method. Some entries (POLY) take double click as their end. This is also processed in this method.

this_mouseDragged

public void this_mouseDragged(java.awt.event.MouseEvent ev)

Event handler invoked when the mouse is dragged. It is very important for most drawing is finished by dragging the mouse.

this_mouseMoved

public void this_mouseMoved(java.awt.event.MouseEvent ev)

this_mouseReleased

public void this_mouseReleased(java.awt.event.MouseEvent ev)

Event handler invoked when the mouse is released. The mouse release often means a drawing is finished (POLY is the exception). So many final updating and drawing is done in this methods.

this_keyPressed

public void this_keyPressed(java.awt.event.KeyEvent ev)

Event handler invoked when the keyboard is pressed. It is useful when the user is drawing a TEXT entry.

signalfinal

public void signalfinal()

A peripheral method which help to draw the POLY and TEXT entry.

getImage

public java.awt.Image getImage()

Class

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SUMMARY: INNER | FIELD | CONSTR | METHOD

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edu.virginia.cs.mng.hypercast.demo Class DrawArea

WIDTH

HEIGHT

TIMEVAL

parent

g

gOff

gDrag

fm

imoff

imdrag

initx

inity

lastx

lasty

pointx

pointy

dragx

dragy

idragx

idragy

killx

killy

lastsize

lastdragged

polyx

polyy

inpoly

virgin

nuked

founde

strx

stry

scrollx

scrolly

kludge

pagenumber

bCanDrawText

firsttime

sPrev

xxxxx

DrawArea

doLayout

updateGraphics

getMinimumSize

getMaximumSize

getPreferredSize

draw

paintComponent

clearEntry

drawTextBox

this_mousePressed

this_mouseDragged

this_mouseMoved

this_mouseReleased

this_keyPressed

signalfinal

getImage

edu.virginia.cs.mng.hypercast.demo
Class DrawArea