Final Project ProposalSpace Invaders

By Jordan Mahaffey

Game Overview

Similar to “Space Invaders”

Will build upon techniques learned during breakout project

Overview, Continued

Player control a ship at bottom of screen

Collection of enemy ships advancing

Destroy enemy ships before they reach player

Sprites

Sprites Ship sprite An array of arrays of enemy ship sprites A background sprite to simulate space Bullet sprites Enemy bullet sprites

String Sprites Level display string sprite Score display string sprite String sprite that announces a player has reached a new

level and then disappears String sprite that appears when the player loses

Trackers

Need a tracker for all moving objects

Player ship tracker Trackers of the enemy ships Trackers for player bullets Trackers for enemy bullets

Collision

Five Possible Collisions

When player ship intersects enemy ship, player loses.

When enemy bullet intersects player ship, player loses

When enemy ship hit the bottom of screen, player loses

When enemy ship hits side of screen, enemy ship formation changes direction and moves down a fixed amount.

When enemy ship intersects player bullet, ship sprite is killed

Scoring

For each enemy ship destroyed, the player will earn the number of points equivalent to the level he is on. Level 1: 1 point per enemy ship destroyed Level 4: 4 points per enemy ship destroyed Level 31: 11 point per enemy ship destroyed

Level Progression

As player progresses through levels Enemy ships move faster Enemy ships fire more bullets Player receives more points per enemy ship

No end to levels—game gets harder and harder

Game Over

The game ends when the player loses after Being hit by an enemy ship Being hit by an enemy bullet The formation of ships reaches the bottom of the

screen

The game cannot be beaten and the levels are infinite and become increasingly difficult.

Order of Priority

Make ship and make ship move side to side

Make an array of arrays of enemy string sprites and make the formation of enemies advance appropriately

Make player bullets and make them move up the screen and destroy enemy ships upon collision

Make level and score display and make score update appropriately when ships are destroyed

Make a new level and reset game state upon completion of previous level

Make enemy fire bullets back at the player

Possible Enhancements

Enemy ships firing bullets back at player Different formations of enemy ships on each

level Special enemy ships take more than one

bullet to destroy The player has the possibility to fire a “bomb”

that destroys all ships in a certain radius.

Questions?