javalib.worldcanvas
Class MyCanvas

java.lang.Object
  javalib.worldcanvas.MyCanvas

public abstract class MyCanvas
extends Object

Abstract Canvas - allows the drawing of shapes, lines, and text in the window of the given size, window closing and re-opening.

Since:

July 12 2007, August 2, 2007, October 19, 2009

Author:

Viera K. Proulx

Field Summary

protected int	height the height of the panel
protected int	width the width of the panel

Constructor Summary

MyCanvas(int width, int height)
Construct a MyCanvas with the given width and height.

Method Summary

abstract void	clear() Clear the canvas before painting the next scene
abstract boolean	drawImage(ImageMaker image, Posn nw) Draw the image provided by the ImageMaker on the Canvas at the given NW corner
abstract boolean	drawImage(String fileName, Posn nw) Draw the image in the specified file at the location of the given NW corner
abstract boolean	drawImage(WorldImage image) Draw the image on the Canvas at its pinhole location.
abstract Graphics2D	getBufferGraphics() Returns a Graphics2D object that permits painting to the internal buffered image for this canvas.
String	toIndentedString(String indent) Produce an indented String representation of this Canvas
String	toString() Produce a String representation of this Canvas

Methods inherited from class java.lang.Object

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

Field Detail

height

protected int height

the height of the panel

width

protected int width

the width of the panel

Constructor Detail

MyCanvas

public MyCanvas(int width,
                int height)

Construct a MyCanvas with the given width and height.

Parameters:

width - the width of the panel

height - the height of the panel

Method Detail

clear

public abstract void clear()

Clear the canvas before painting the next scene

drawImage

public abstract boolean drawImage(ImageMaker image,
                                  Posn nw)

Draw the image provided by the ImageMaker on the Canvas at the given NW corner

Parameters:

image - the image maker for the image file

nw - the NW corner for the image placement

drawImage

public abstract boolean drawImage(String fileName,
                                  Posn nw)

Draw the image in the specified file at the location of the given NW corner

Parameters:

fileName - the name of the image file

nw - the NW corner for the image placement

drawImage

public abstract boolean drawImage(WorldImage image)

Draw the image on the Canvas at its pinhole location.

Parameters:

image - the image to be drawn

Returns:

true

getBufferGraphics

public abstract Graphics2D getBufferGraphics()

Returns a Graphics2D object that permits painting to the internal buffered image for this canvas.

toIndentedString

public String toIndentedString(String indent)

Produce an indented String representation of this Canvas

Parameters:

indent - the desired indentation: ignored, because we only produce one line of text.

toString

public String toString()

Produce a String representation of this Canvas

Overrides:

toString in class Object