Class Graphics2DTest

java.lang.Object
  Graphics2DTest

Direct Known Subclasses:

Graphics2DTestPlusButton, Graphics2DTestPlusUserDrawing

public class Graphics2DTest

extends java.lang.Object

Class Graphics2DTest is a simple example of drawing on and updating a Graphics2D display. It displays a background image and allows the user to add and delete rectangles from the drawing. It also adds a mouse listener that reports when and where a mouse press happens.

The Java tutorial on 2D graphics covers all the details of how to use the Graphics2d and Graphics classes. The Java tutorial on "How to Write a Mouse Listener" covers the subject of mouse listeners.

Nested Class Summary

static class	Graphics2DTest.DrawingCanvas Class DrawingCanvas defines a drawing canvas as a JPanel with a specialized paint method.
static class	Graphics2DTest.MousePressedListener Class MousePressedListener implements a mouse listener for press events only, ignoring all other events.
static class	Graphics2DTest.RectShape Class RectShape defines the model datatype for a rectangle as an x/y position and a width/height.

Field Summary

protected static javax.swing.JButton	addButton The add rect button
protected static javax.swing.Box	buttonBox Box for row of buttons at bottom of display
protected static Graphics2DTest.DrawingCanvas	canvas The drawing canvas
protected static javax.swing.JButton	delButton The delete rect button
protected static javax.swing.JFrame	frame Outermost display window
protected static javax.swing.JButton	numButton The number of rects button
protected static java.util.Vector	shapeList Collection of RectShape objects to draw on the canvas.
protected static javax.swing.Box	vbox Inner box of display window
protected static int	x Successive x position of added rects
protected static int	y Successive y position of added rects

Constructor Summary

Graphics2DTest()

Method Summary

protected static void	addButtonListeners(javax.swing.JButton addButton, javax.swing.JButton delButton, javax.swing.JButton numButton)
static void	compose() Construct and compose the window contents, which is comprised of the scrolling drawing canvas and the bottom row of buttons.
static void	main(java.lang.String[] args) Just call the compose method to do all of the work.

Methods inherited from class java.lang.Object

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

Field Detail

canvas

protected static Graphics2DTest.DrawingCanvas canvas

The drawing canvas

shapeList

protected static java.util.Vector shapeList

Collection of RectShape objects to draw on the canvas.

x

protected static int x

Successive x position of added rects

y

protected static int y

Successive y position of added rects

frame

protected static javax.swing.JFrame frame

Outermost display window

vbox

protected static javax.swing.Box vbox

Inner box of display window

buttonBox

protected static javax.swing.Box buttonBox

Box for row of buttons at bottom of display

addButton

protected static javax.swing.JButton addButton

The add rect button

delButton

protected static javax.swing.JButton delButton

The delete rect button

numButton

protected static javax.swing.JButton numButton

The number of rects button

Constructor Detail

Graphics2DTest

public Graphics2DTest()

Method Detail

compose

public static void compose()

Construct and compose the window contents, which is comprised of the scrolling drawing canvas and the bottom row of buttons.

addButtonListeners

protected static void addButtonListeners(javax.swing.JButton addButton,
                                         javax.swing.JButton delButton,
                                         javax.swing.JButton numButton)

main

public static void main(java.lang.String[] args)

Just call the compose method to do all of the work.