Opus5
Class GraphicalObject

java.lang.Object
  |
  +--Opus5.GraphicalObject

All Implemented Interfaces:

GraphicsPrimitives

Direct Known Subclasses:

Circle, Rectangle

public abstract class GraphicalObject

extends java.lang.Object

implements GraphicsPrimitives

The GraphicalObject class is the base class from which various concrete graphical object classes are derived.

Version:

$Id: GraphicalObject.java,v 3.2 1998/07/28 13:43:52 brpreiss Exp $

Author:

Bruno R. Preiss, P.Eng.

Field Summary

int	backgroundColor The background color.
protected Point	center The center point of this graphical object.
int	foregroundColor The foreground color.

Fields inherited from interface Opus5.GraphicsPrimitives

copyright

Constructor Summary

GraphicalObject(Point p)
Constructs a GraphicalObject with the specified center point.

Method Summary

abstract void	draw() Draws this graphical object.
void	erase() Erases this graphical object.
void	moveTo(Point p) Moves this graphical object to the specified point.
void	setPenColor(int color) Sets the pen to the specified color.

Methods inherited from class java.lang.Object

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

Field Detail

center

protected Point center

The center point of this graphical object.

backgroundColor

public final int backgroundColor

The background color.

foregroundColor

public final int foregroundColor

The foreground color.

Constructor Detail

GraphicalObject

public GraphicalObject(Point p)

Constructs a GraphicalObject with the specified center point.

Parameters:

p - The center point.

Method Detail

draw

public abstract void draw()

Draws this graphical object.

Specified by:

draw in interface GraphicsPrimitives

erase

public void erase()

Erases this graphical object. Implemented as follows:

 setPenColor (backgroundColor);
 draw ();
 setPenColor (foregroundColor);
 

Specified by:

erase in interface GraphicsPrimitives

moveTo

public void moveTo(Point p)

Moves this graphical object to the specified point. Implemented as follows:

 erase ();
 center = p;
 draw ();
 

Specified by:

moveTo in interface GraphicsPrimitives

Following copied from interface: Opus5.GraphicsPrimitives

Parameters:

p - The point to which this object is to be moved.

See Also:

Point

setPenColor

public void setPenColor(int color)

Sets the pen to the specified color. This method is not yet implemented.

Parameters:

color - The desired color of pen.

Throws:

MethodNotImplemented - Always.