Project 2: Space Invaders (Due Nov. 22 at midnight)
Note: You may work in a group of up to three students for this project, but there must be someone who you have
not worked with in the group. Every group (triples, pairs, or individuals) needs to send me an email saying who
they are working with.
Project Description
Space Invaders is an old arcade game about destroying alien spaceships. In the game, you control a lone
projectile-shooting spaceship, and must destroy an enemy fleet before they ove
un your position or shoot you
down. Many variations of the game exist; you can play a Flash clone of the original here, and a simplified
JavaScript version here.
This project asks you to create your own version of Space Invaders. You have a lot of creative freedom in how
the game works, but your game must do the following:
The player must control a ship that moves left and right at the bottom of the screen, that can fire projectiles
at the enemy.
There must be a grid of aliens that move left and right, and that moves down towards the player over time.
The aliens must randomly fire projectiles at the player.
If a player-fired projectile touches an alien, the alien must be removed.
If an alien-fired projectile touches the player, the player loses.
If an alien touches the player, the player loses.
If an alien gets past the bottom of the screen, the player loses.
If all aliens are destroyed, the player wins.
There must be end screens when the player wins and loses.
Outside of these requirements, you can do whatever you want. Are you controlling an X-wing to shoot down TIE
fighters? Controlling EVE to shoot down AUTOs? You could draw that. Should there be a boss fight? Levels?
You can try coding all these possibilities once you are done with the basic game.
https:
en.wikipedia.org/wiki/Space_Invaders
http:
www.freeinvaders.org
https:
dwmke
.github.io/spaceinvaders
https:
en.wikipedia.org/wiki/Star_Wars
https:
en.wikipedia.org/wiki/WALL-E
Code Walkthrough
The project has two starter classes, and you will need to create more to represent the player, the aliens, etc. The
two starter classes are:
GraphicsObject is almost exactly the same class as the one you used for the animation homework. The
only difference is that we will use doubles for the position and speed, to get more precision. You will need
to convert (cast) the doubles to ints when drawing.
SpaceInvaders is based off the Animation class. I have made some changes to get rid of the flickering,
ut the general idea is the same. All of the following components of the game are marked with FIXMEs in
the code.
Instead of having a generic A
ayList of GraphicsObjects, you will directly have member variables
for the player, the aliens, etc. You must create these member variables yourself and initialize them in
the constructor.
You must also write the code that updates each member variable in update().
Instead of a paint() method, I have created three separate methods, paintGameScreen(),
paintWinScreen(), and paintLoseScreen(). You must write the code for these methods, which
will paint the screen during normal gameplay, when the player has won, and when the player has
lost, respectively.
There are two new methods hasWonGame() and hasLostGame(). You must write the code for these
methods, which will determine if the game should end. I use the return values from these methods to
decide which paint method to call.
Finally, there are three more new methods: keyPressed(), keyTyped(), and keyReleased(). These
functions allow the program to respond to key presses. The only one you need to write code for is
keyPressed(); the other two can be left empty. I have created some code that detects the left and
ight a
ows and the space bar, but you will have to write the code for what happens.
Hints
To help you get started on a project of this scope, here is a recommendation for what to tackle first:
1. Draw the playe
2. Make the player move based on key presses
3. Draw the aliens
4. Make the aliens move
5. Create and draw player-fired projectiles based on key presses
6. Remove aliens when a player-fired project touches them
7. Make aliens randomly fire projectiles
8. Detect a win and show an appropriate end screen
9. Detect a loss and show an appropriate end screen
Submission
When you are done, fill out the evaluation and email all your .java files to me.
https:
forms.gle/P7JgnyWTki3TRRBk6