Class ScaledDisplay

java.lang.Object
  |
  +--ScaledDisplay

All Implemented Interfaces:

LocatableDisplay

Direct Known Subclasses:

ColorBlockDisplay, DefaultDisplay, RotatedDisplay, ScaledImageDisplay

public abstract class ScaledDisplay

extends java.lang.Object

implements LocatableDisplay

Environment-Based Applications:
This abstract class provides common implementation code for drawing a Locatable object. The class will translate and scale the graphics system as needed and then invoke its abstract draw method. Subclasses of this abstract class define draw to just display an object with a fixed size.

Version:

1 October 2002

Constructor Summary

ScaledDisplay()

Method Summary

void	adjust(Locatable obj, java.awt.Component comp, java.awt.Graphics2D g2) Adjusts the graphics system for drawing an object, as appropriate.
abstract void	draw(Locatable obj, java.awt.Component comp, java.awt.Graphics2D g2) Draw the given Locatable object.
void	draw(Locatable obj, java.awt.Component comp, java.awt.Graphics2D g2, java.awt.Rectangle rect) Draw the given object.

Methods inherited from class java.lang.Object

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

Constructor Detail

ScaledDisplay

public ScaledDisplay()

Method Detail

draw

public abstract void draw(Locatable obj,
                          java.awt.Component comp,
                          java.awt.Graphics2D g2)

Draw the given Locatable object. Subclasses should implement this method to draw the object in a cell of size (1,1) centered around (0,0) on the drawing surface. (All scaling has been done beforehand).

Parameters:

obj - object we want to draw

comp - component on which to draw

g2 - drawing surface

draw

public void draw(Locatable obj,
                 java.awt.Component comp,
                 java.awt.Graphics2D g2,
                 java.awt.Rectangle rect)

Draw the given object. Scales the coordinate appropriately then invokes the simple draw method above that is only responsible for drawing a unit-length object.

Specified by:

draw in interface LocatableDisplay

Parameters:

obj - object we want to draw

comp - component on which to draw

g2 - drawing surface

rect - rectangle in which to draw

adjust

public void adjust(Locatable obj,
                   java.awt.Component comp,
                   java.awt.Graphics2D g2)

Adjusts the graphics system for drawing an object, as appropriate. This method actually makes no further adjustments, but subclasses could override this method to rotate the object, for example.