Lab 17: GUI Part II

The goal of this lab is to get more practice using Java's GUI capabilities to write programs that use windows and buttons.

1. Introduction

Lights Out is a game with a 5x5 grid of lighted buttons. When you press each button, it and its neighbors are toggled on and off. For example, suppose a button's light is on, the one above it is on, the one to the left is off, the one to the right is on, and the one below is off. If you press this button, the result will be that button off, the one above if off, the one to the left on, the one to the right off, and the one below on. Below is an example of what the game might look like.

The game begins in a random (or pre-defined) orientation, and the object is to turn all the lights out. In this lab, you will create a game like this.

2. Image Icons

In today's lab, we will want buttons to appear to have lights which turn on and off. Notice on Monday's handout (or in the Java API) that JButton has a method setIcon(Icon). The class ImageIcon is a subtype of Icon. The constructor of ImageIcon takes the fame of a file; this file can be in any standard image format, such as jpg or gif.

3. Setup

As usual, make a new directory for this project and cd into it.

Part of this program is going to be similar to what you did on Tuesday---both windows, afterall, are just grids of buttons. So, copy over your FifteenPuzzle.java from last time, but rename it LightsOut.java.

cp ../lab16/FifteenPuzzle.java LightsOut.java

Also copy the following files which contain icons for on and off lights (unless you want to find your own on the Internet):

cp /homeemp/tvandrun/pub/235/gui/reddot.jpg .
cp /homeemp/tvandrun/pub/235/gui/blackdot.jpg .

4. Setting up the window

Make the following changes to LightsOut.java:

• Update the name of the class, the documentation, etc
• LightsOut uses a 5x5 grid instead of a 4x4 grid, so make appropriate changes
• You will no longer need the counter.
• Change the name of the action listener class to something like Light, but also comment those lines out for the time being since you haven't made the Light class yet.

Then run the program to see what the window looks like. The buttons will all be blank at this point.

5. Writing the action listeners

Write the action listener class. You may want to have your PuzzlePiece code hand to look at, but this will be different enough that you probably do not want simply to copy, paste, and modify (like you did in LightsOut.java. This class should have the following properties:

• At any point, the light should be on or off.
• When the light is on, a red dot should appear on the button; when it is off, a black dot should appear.
• When the game starts, the light's configuration (that is, whether it's on or off) should be set randomly. Use Math.random for this.
• As explained above, when someone clicks on this button, its configuration and the configuration of each of its neighbors should toggle.

6. Turn in

Email the values to Joe.