scribble
Class ScribbleCanvas

java.lang.Object
  java.awt.Component
      java.awt.Canvas
          scribble.SmartCanvas
              scribble.ScribbleCanvas

All Implemented Interfaces:

javax.accessibility.Accessible, java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable

public class ScribbleCanvas

extends SmartCanvas

An extended SmartCanvas that echos user's mouse strokes as lines.

Handles mouse events (by creating lines to put in the repository), can be given a Color in which to draw, can be cleared.

Copyright 1996 Massachusetts Institute of Technology

Version:

$Id: ScribbleCanvas.java,v 1.1.1.1 2002/06/05 21:56:35 root Exp $

Author:

Todd C. Parnell, tparnell@ai.mit.edu, Maciej Stachowiak, maciej@ai.mit.edu, Lynn Andrea Stein, las@ai.mit.edu

See Also:

SmartCanvas, Serialized Form

Nested Class Summary

Nested classes inherited from class java.awt.Canvas

java.awt.Canvas.AccessibleAWTCanvas

Nested classes inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy

Field Summary

protected java.awt.Color	currColor The current color to draw lines in.
protected int	currX
protected int	currY

Fields inherited from class scribble.SmartCanvas

repository

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

ScribbleCanvas()
Creates a new ScribbleCanvas.

ScribbleCanvas(ScribbleData sd)
Creates a new ScribbleCanvas with associated ScribbleData.

Method Summary

void	clearLines() Removes all lines from the data repository.
protected void	lineTo(int endX, int endY) Adds a line (from the saved start point to the point passed) to the data repository.
protected void	resetCoords() Gives the x and y coords impossible values to signal that new coords are expected.
void	setColor(java.awt.Color c) Changes the drawing color.
protected void	setCoords(int x, int y) Saves the starting point for drawing a line in currX, currY

Methods inherited from class scribble.SmartCanvas

paint

Methods inherited from class java.awt.Canvas

addNotify, createBufferStrategy, createBufferStrategy, getAccessibleContext, getBufferStrategy, update

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, validate

Methods inherited from class java.lang.Object

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

Field Detail

currX

protected int currX

currY

protected int currY

currColor

protected java.awt.Color currColor

The current color to draw lines in.

Constructor Detail

ScribbleCanvas

public ScribbleCanvas()

Creates a new ScribbleCanvas.

ScribbleCanvas

public ScribbleCanvas(ScribbleData sd)

Creates a new ScribbleCanvas with associated ScribbleData.

Method Detail

clearLines

public void clearLines()

Removes all lines from the data repository. Then forces a call to the paint method.

setColor

public void setColor(java.awt.Color c)

Changes the drawing color.

Parameters:

c - the new drawing color.

resetCoords

protected void resetCoords()

Gives the x and y coords impossible values to signal that new coords are expected.

setCoords

protected void setCoords(int x,
                         int y)

Saves the starting point for drawing a line in currX, currY

Parameters:

x - the x coord of the starting point

y - the y coord of the starting point

lineTo

protected void lineTo(int endX,
                      int endY)

Adds a line (from the saved start point to the point passed) to the data repository.

Parameters:

endX - the x coord of the line's endpoint

endY - the y coord of the line's endpoint