Class DrawPadView

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

All Implemented Interfaces:

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

public class DrawPadView

extends java.applet.Applet

implements java.awt.event.MouseListener, java.awt.event.MouseMotionListener, java.awt.event.KeyListener

CLASS: DrawPadView
PURPOSE: This class handle all the GUI action and this is also the main class for the applet
IMPORT: java.awt.Color, java.applet.Applet, java.awt.Graphics, java.awt.Image, java.awt.event.MouseEvent, java.awt.event.MouseListener, java.awt.event.MouseMotionListener, java.awt.event.KeyListener, java.awt.event.KeyEvent, Ellipse, Rectangle, Line, Polygon, DrawableShape, DrawPadDoc, Point
EXPORT: New Class|DrawPadView
New Method| init, keyPressed, keyReleased, keyTyped, mouseClicked, mouseDragged, mouseEntered, mouseExited, mouseMoved, mousePressed, mouseReleased, paint, setSelectedColor, update, drawBorder, drawColorBar, drawCurrentColor, drawOptionBar

See Also:

Serialized Form

Inner classes inherited from class java.applet.Applet

java.applet.Applet.AccessibleApplet

Inner classes inherited from class java.awt.Panel

java.awt.Panel.AccessibleAWTPanel

Inner classes inherited from class java.awt.Container

java.awt.Container.AccessibleAWTContainer

Inner classes inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent, java.awt.Component.AWTTreeLock

Field Summary

private java.awt.Graphics	backBufferGraphics Graphic context associate with the back image buffer
private java.awt.Image	backBufferImage Back Image buffer for drawing
private boolean	bChangingColor A flag to indicate whether we are changing the shape's color
private boolean	bDrawingShape A flag to indicate whether a shape is being draw
private int	BORDER_WIDTH Constant for the border width
private boolean	bSelectedPointBox A flag to indicate whether a point box for a shape has been selected
private boolean	bSelectedShape A flag to indicate whether a shape is selected in the list
private java.awt.Color[]	colorList An Array of color that is available
private DrawableShape	currentShape Current shape object for before adding to DrawPadDoc
private byte	DOUBLE_IMAGE_SIZE Constant for 2 * image size in pixel.
private int	drawHeight Drawing area height.
private DrawPadDoc	drawPadDoc Keep track of all the shape and for the editing methods
private int	drawWidth Drawing area width.
private Point	endPoint keep track of the last point
private byte	HALF_IMAGE_SIZE Constant for half image size in pixel.
private byte	IMAGE_DOWN Constant to indicate the image is in down-state
private byte	IMAGE_SIZE Constant for the image size in pixel.
private byte	IMAGE_UP Constant to indicate the image is in up-state
private java.lang.String	imageDirectory Constant for the path that the image files is in
private java.lang.String[][]	imageNames Name of the option image files (upstate and downstate)
private byte	OPT_ELLIPSE Constant for Ellipseect Option
private byte	OPT_FILLED_ELLIPSE Constant for Filled Ellipse Option
private byte	OPT_FILLED_POLYGON Constant for Filled Polygon Option
private byte	OPT_FILLED_RECTANGLE Constant for Filled Rectangle Option
private byte	OPT_LINE Constant for Line Option
private byte	OPT_POLYGON Constant for Polygon Option
private byte	OPT_RECTANGLE Constant for Rectangle Option
private byte	OPT_SELECT Constant for Select Option
private java.awt.Image[][]	optionImages array to contain the images for options
private int	selectedColor Color that has been selected
private int	selectedOption Option that has been selected

Fields inherited from class java.applet.Applet

accessibleContext, serialVersionUID, stub

Fields inherited from class java.awt.Panel

base, nameCounter

Fields inherited from class java.awt.Container

component, containerListener, containerSerializedDataVersion, dbg, dispatcher, layoutMgr, listeningBoundsChildren, listeningChildren, maxSize, ncomponents, printing, printingThreads

Fields inherited from class java.awt.Component

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

Fields inherited from interface java.awt.image.ImageObserver

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

Constructor Summary

DrawPadView()

Method Summary

private void	drawBorder(java.awt.Graphics g) PRE: Valid Graphic object. POST: Draw the border for the drawing area
private void	drawColorBar(java.awt.Graphics g) PRE: Valid Graphic object. POST: Draw the color bar to the given Graphics object
private void	drawCurrentColor(java.awt.Graphics g) PRE: Valid Graphic object. POST: Draw the color that we are using right now
private void	drawOptionBar(java.awt.Graphics g) PRE: Valid Graphic object. POST: Draw the option bar to the given Graphics object
void	init() PRE: None POST: Initialize all the variables and GUI for the applet
void	keyPressed(java.awt.event.KeyEvent e) PRE: A valid KeyEvent Object POST: Perform editing functionality.
void	keyReleased(java.awt.event.KeyEvent e) PRE: A valid KeyEvent Object POST: This method was override from the interface KeyListener.
void	keyTyped(java.awt.event.KeyEvent e) PRE: A valid KeyEvent Object POST: This method was override from the interface KeyListener.
void	mouseClicked(java.awt.event.MouseEvent e) PRE: A valid MouseEvent Object POST: This method was override from the interface MouseListener.
void	mouseDragged(java.awt.event.MouseEvent e) PRE: A valid MouseEvent Object POST: Show rubber band effect and perform editing functionality.
void	mouseEntered(java.awt.event.MouseEvent e) PRE: A valid KeyEvent Object POST: This method was override from the interface MouseMotionListener.
void	mouseExited(java.awt.event.MouseEvent e) PRE: A valid KeyEvent Object POST: This method was override from the interface MouseMotionListener.
void	mouseMoved(java.awt.event.MouseEvent e) PRE: A valid MouseEvent Object POST: For rubber band effect when drawing object.
void	mousePressed(java.awt.event.MouseEvent e) PRE: A valid MouseEvent Object POST: Set all the flags needed.
void	mouseReleased(java.awt.event.MouseEvent e) PRE: A valid MouseEvent Object POST: Set all the flags needed.
void	paint(java.awt.Graphics g) PRE: A valid Graphics Object POST: Will have drawPadDoc draw all its shape and also draw the current shape if we are doing Add shape.
void	setSelectedColor(java.awt.Color c) PRE: A valid Color Object POST: set and update the color bar to the input color
void	update(java.awt.Graphics g) PRE: A valid Graphics Object POST: Will have drawPadDoc draw all its shape and also draw the current shape if we are doing Add shape.

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, start, stop

Methods inherited from class java.awt.Panel

, addNotify, constructComponentName

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, adjustListeningChildren, applyOrientation, checkGD, countComponents, createChildHierarchyEvents, createHierarchyEvents, deliverEvent, dispatchEventImpl, dispatchEventToSelf, doLayout, eventEnabled, findComponentAt, findComponentAt, findComponentAt, getAccessibleAt, getAccessibleChild, getAccessibleChildrenCount, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents_NoClientCode, getComponents, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getMouseEventTarget, getPreferredSize, getWindow, initIDs, insets, invalidate, invalidateTree, isAncestorOf, layout, lightweightPaint, lightweightPrint, list, list, locate, minimumSize, nextFocus, numListening, paintComponents, paintHeavyweightComponents, paramString, postProcessKeyEvent, postsOldMouseEvents, preferredSize, preProcessKeyEvent, print, printComponents, printHeavyweightComponents, processContainerEvent, processEvent, proxyEnableEvents, proxyRequestFocus, readObject, remove, remove, removeAll, removeContainerListener, removeNotify, setFocusOwner, setFont, setLayout, transferFocus, validate, validateTree, writeObject

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, areInputMethodsEnabled, bounds, checkImage, checkImage, checkWindowClosingException, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getAccessibleIndexInParent, getAccessibleStateSet, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont_NoClientCode, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getInputContext, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen_NoTreeLock, 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, isRecursivelyVisible, 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, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, resetGC, 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

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

Field Detail

endPoint

private Point endPoint

keep track of the last point

drawPadDoc

private DrawPadDoc drawPadDoc

Keep track of all the shape and for the editing methods

currentShape

private DrawableShape currentShape

Current shape object for before adding to DrawPadDoc

bSelectedShape

private boolean bSelectedShape

A flag to indicate whether a shape is selected in the list

bDrawingShape

private boolean bDrawingShape

A flag to indicate whether a shape is being draw

bSelectedPointBox

private boolean bSelectedPointBox

A flag to indicate whether a point box for a shape has been selected

bChangingColor

private boolean bChangingColor

A flag to indicate whether we are changing the shape's color

imageNames

private java.lang.String[][] imageNames

Name of the option image files (upstate and downstate)

optionImages

private java.awt.Image[][] optionImages

array to contain the images for options

IMAGE_UP

private final byte IMAGE_UP

Constant to indicate the image is in up-state

IMAGE_DOWN

private final byte IMAGE_DOWN

Constant to indicate the image is in down-state

IMAGE_SIZE

private final byte IMAGE_SIZE

Constant for the image size in pixel. Image size is alway in Square

HALF_IMAGE_SIZE

private final byte HALF_IMAGE_SIZE

Constant for half image size in pixel. For faster calculation

DOUBLE_IMAGE_SIZE

private final byte DOUBLE_IMAGE_SIZE

Constant for 2 * image size in pixel. For faster calculation

OPT_SELECT

private final byte OPT_SELECT

Constant for Select Option

OPT_LINE

private final byte OPT_LINE

Constant for Line Option

OPT_RECTANGLE

private final byte OPT_RECTANGLE

Constant for Rectangle Option

OPT_FILLED_RECTANGLE

private final byte OPT_FILLED_RECTANGLE

Constant for Filled Rectangle Option

OPT_ELLIPSE

private final byte OPT_ELLIPSE

Constant for Ellipseect Option

OPT_FILLED_ELLIPSE

private final byte OPT_FILLED_ELLIPSE

Constant for Filled Ellipse Option

OPT_POLYGON

private final byte OPT_POLYGON

Constant for Polygon Option

OPT_FILLED_POLYGON

private final byte OPT_FILLED_POLYGON

Constant for Filled Polygon Option

imageDirectory

private final java.lang.String imageDirectory

Constant for the path that the image files is in

BORDER_WIDTH

private final int BORDER_WIDTH

Constant for the border width

selectedOption

private int selectedOption

Option that has been selected

selectedColor

private int selectedColor

Color that has been selected

backBufferImage

private java.awt.Image backBufferImage

Back Image buffer for drawing

backBufferGraphics

private java.awt.Graphics backBufferGraphics

Graphic context associate with the back image buffer

drawWidth

private int drawWidth

Drawing area width. Default is 500, can be pass in from the html

drawHeight

private int drawHeight

Drawing area height. Default is 400, can be pass in from the html

colorList

private final java.awt.Color[] colorList

An Array of color that is available

Constructor Detail

DrawPadView

public DrawPadView()

Method Detail

init

public void init()

PRE: None
POST: Initialize all the variables and GUI for the applet

Overrides:

init in class java.applet.Applet

drawCurrentColor

private void drawCurrentColor(java.awt.Graphics g)

PRE: Valid Graphic object.
POST: Draw the color that we are using right now

drawColorBar

private void drawColorBar(java.awt.Graphics g)

PRE: Valid Graphic object.
POST: Draw the color bar to the given Graphics object

drawBorder

private void drawBorder(java.awt.Graphics g)

PRE: Valid Graphic object.
POST: Draw the border for the drawing area

drawOptionBar

private void drawOptionBar(java.awt.Graphics g)

PRE: Valid Graphic object.
POST: Draw the option bar to the given Graphics object

paint

public void paint(java.awt.Graphics g)

PRE: A valid Graphics Object
POST: Will have drawPadDoc draw all its shape and also draw the current shape if we are doing Add shape. Also will draw color bar and option bar

Overrides:

paint in class java.awt.Container

update

public void update(java.awt.Graphics g)

PRE: A valid Graphics Object
POST: Will have drawPadDoc draw all its shape and also draw the current shape if we are doing Add shape. Also will draw color bar and option bar. This method is override for double buffering technique.

Overrides:

update in class java.awt.Container

mouseReleased

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

PRE: A valid MouseEvent Object
POST: Set all the flags needed. Also add shape to the list in some cases. This method was override from the interface MouseListener.

Specified by:

mouseReleased in interface java.awt.event.MouseListener

mousePressed

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

PRE: A valid MouseEvent Object
POST: Set all the flags needed. Also add shape to the list in some cases. This will also keep track of last mouse point clicked. Perform actions result from clicking at the option/color bar. Also perform editing methods. This method was override from the interface MouseListener.

Specified by:

mousePressed in interface java.awt.event.MouseListener

mouseMoved

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

PRE: A valid MouseEvent Object
POST: For rubber band effect when drawing object. This method was override from the interface MouseMotionListener.

Specified by:

mouseMoved in interface java.awt.event.MouseMotionListener

mouseDragged

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

PRE: A valid MouseEvent Object
POST: Show rubber band effect and perform editing functionality. This method was override from the interface MouseMotionListener.

Specified by:

mouseDragged in interface java.awt.event.MouseMotionListener

keyPressed

public void keyPressed(java.awt.event.KeyEvent e)

PRE: A valid KeyEvent Object
POST: Perform editing functionality. This method was override from the interface KeyListener.

Specified by:

keyPressed in interface java.awt.event.KeyListener

setSelectedColor

public void setSelectedColor(java.awt.Color c)

PRE: A valid Color Object
POST: set and update the color bar to the input color

keyTyped

public void keyTyped(java.awt.event.KeyEvent e)

PRE: A valid KeyEvent Object
POST: This method was override from the interface KeyListener.

Specified by:

keyTyped in interface java.awt.event.KeyListener

mouseEntered

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

PRE: A valid KeyEvent Object
POST: This method was override from the interface MouseMotionListener.

Specified by:

mouseEntered in interface java.awt.event.MouseListener

mouseClicked

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

PRE: A valid MouseEvent Object
POST: This method was override from the interface MouseListener.

Specified by:

mouseClicked in interface java.awt.event.MouseListener

mouseExited

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

PRE: A valid KeyEvent Object
POST: This method was override from the interface MouseMotionListener.

Specified by:

mouseExited in interface java.awt.event.MouseListener

keyReleased

public void keyReleased(java.awt.event.KeyEvent e)

PRE: A valid KeyEvent Object
POST: This method was override from the interface KeyListener.

Specified by:

keyReleased in interface java.awt.event.KeyListener