Final Project: Space Invaders

1
Final Project Space Invaders

• Progress Report

2
Game Overview

• Similar to Space Invaders
• Player control a ship at bottom of screen
• Collection of enemy ships advancing
• Destroy enemy ships before they hit players ship
  or bottom of screen.

3
Implemented Classes

• addSprites
• Used to add sprites to the screen.
• initState
• Used to initialize and give sprites specific
  properties (Scale, Location, Rotation).
• advanceFrame
• Used to continuously call handleInput and
  handleCollisions
• changeLevel
• Resets gamestate and changes scoring/enemy speed

4
Implemented Classes, cont.

• handleInput
• Interprets mouse movement and keyboard input.
• Moving ship
• Firing bullets
• handleCollisions
• Detects for collisions between enemy ships and
  walls
• Player ship and enemy ships
• Enemy ships and all walls
• Enemy ships and bullets
• Player ships and enemy bullets
• initBullet
• Creates a bullet to be fired at location of
  player ship

5
Theme Development

• General Path used to make player ship and enemy
  ships looks like space ships.
• An image of space will make-up the background to
  give a more immersive feel.

6
Level Progression

• Not yet implemented.
• As player progresses through levels
• Enemy ships move faster
• Enemy ships fire more bullets
• Player receives more points per enemy ship
• No end to levelsgame gets harder and harder

7
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

8
Documentation

• Writing documentation as methods are written to
  accurately and thoroughly annotate code.

9
Demonstration

• Game Demo

10
Problems Encountered

• Making formation of enemy ships move as one.
• When player destroys a ship, score continuously
  increases
• Need to find a good solution for what to do with
  enemy ships and bullets when they are destroyed

11
Anticipated/Expected?

• Knew making the enemy ships move as one would be
  the first obstacle.
• The score problem was unexpected.
• The ship/bullet problem is something I knew I
  would run into.

12
State of Problems

• Made ships move as one (while still being
  independent sprites) by assigning each a tracker
  and simply looping through the formation to
  adjust velocities/locations simultaneously.
• Other two are still outstanding problems. Believe
  they are related.
• Bullet stays where it intersects the enemy ship,
  so the collision occurs over and over each time
  handleCollision is called

13
Progress Evaluation

• Are you on track according to your timeline?
• A few days behind timeline.
• What parts of your project are delayed?
• The implementation of advanced game features.
• Why are they delayed?
• Dealing with destroyed ships/bullets is trickier
  than expected.
• What parts of your project are on time?
• Basic games features are almost complete.
• What steps are you taking to get back onto your
  timeline?
• Reassess timeline to have basic game, extra
  features, and debugging completed by end of week.
  
• Has the scope of your project changed? If so, how
  and why?
• The scope and goal of the project is exactly as
  stated in proposal.
• Do you expect to complete your timeline by the
  due date?
• Yes.

14
Project Evaluation

• Game Functionality - 200 points
• Most basic game functions entirely correctly -
  100 points
• Movement and firing of bullets from player ship.
• Side-to-side movement and advancement of enemy
  ships as one unit.
• Enemy ships destroyed and score added when bullet
  intersects ship.
• Correct implementation of levels. Faster enemy
  ships
• Enemy ships firing back more.
• Enemy ships worth more points.

15
Project Evaluation, cont.

• Some simple enhancements made - 50 points
• Enemy ships randomly firing back at player ship.
• Ship's color acts as gauge of life green to red
• So allow player to be hit more than once.
• Several simple enhancements or 1-2 complex
  enhancements made - 50 points
• Enemy ships, other than the formation, flying
  quickly downward for added difficulty. Will fly
  off bottom of the screen if not destroyed, player
  will not lose for this.

16
Questions?