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Proposal: SPACE DESTROYER!

###About The space destroyer is my hybrid version of the arcade games popular known as Asteroids and Space Invaders.

Synopsis

###Elements The game will have four elements that will be factored from different sections as listed below:

  • SpaceObject

    This is a Abstract class that defines the general attributes and behavior of any of my objects floating in space. It comprises of the following listed elements;

    • Falcon

      An horizontally and vertically movable triangle that produces rectangles at the upper tip that we refer to as missiles. It inherits the abstract class spaceobject, and is controlled by the user.

    • Destroyer

      Horizontally movable triangles located at the top of the screen with their main tip facing down.Their movement is predefined and the speed vary depending on the level. They also randomly shoot straight missiles downwards. They are inherited from the abstract class Space Object.

      • DeathStar

        This is a bigger horizontally movable object that shoots missiles in a faster rate than other Destroyers. It also moves faster than other destroyers and disappear on one part of the screen reappear on either side of the screen. It also has a longer life span, than other destroyers. It inherits the Destroyer class.

    • Asteroids

      This are circular objects randomly floating on the screen. They are inherited from the Abstract Space Object class.

  • Missile

    These are vertically mobile rectangles that originate from some members of Space Object. Their velocity and size are determined by which type of object produced them.

##Goal The players goal is to control the falcon to shoot and manoeuvre the Asteroids to eventually destroy the Destroyers and even the DeathStar in the Boss level.

##Game play The game starts at a freeze state with the falcon stationary at the center bottom with three bars at the left corner of the screen showing the player life left and steroids positioned in the screen and the destroyers stationary at the top of the screen. When spacebar is pressed the game starts with steroids randomly floating in the larger part of the mid screen and finally the Destroyers moving horizontally at the top sporadically firing missiles downwards. To complete the level the player has to navigate by using the direction keys to a good firing position and fire at the Destroyers with the space bar while dodging any approaching missile or even the Asteroids. If the player (falcon) hits any edge of the screen or any screen object then their life is reduced by one. If the player looses all their life then the game ends the game is reset back to freeze mode.

If the player manages to destroy all the destroyers then the boss stage begins with every other screen object being cleared and the boss replacing the destroyers at the top. The player will strictly have their number of lives from the previous level.

Functional requirements

  1. The destroyers are placed stationary in a grid 15 at the top at the game start.
  2. The player is placed at the center of the x plane above the bottom of the screen when the game start.
  3. The Asteroids are placed starting from the top 1/4 down to the bottom 3/4 end and stationary in a frozen state.
  4. The player can launch the game by pressing the space bar and this makes the Asteroids begin random motion while the destroyers move uniformly horizontally towards the right.
  5. When the player presses the up or down key, the Falcon moves up or down with a predefined velocity.
  6. On release of the up or down key the Falcon resets to a velocity of zero and stops.
  7. On press of any of the side directions, the Falcon surges towards that side with a predefined velocity.
  8. On release of any of the side directions, the falcon stops.
  9. If the falcon hits any of the sides it loses one life.
  10. If the Falcon hits any of the screen elements or is hit by an element or missile, it loses one life and is reset to a frozen state, and all the asteroids are also recreated and reset to a frozen state. The remaining destroyers are also redrawn and reset to a frozen state awaiting user to press the space bar.
  11. If the Falcon loses all lives the game is over and thus the game resets completely; back to frozen mode with the player having 3 lives.
  12. If any of the other space objects or the screen is hit by a asteroid except the Falcon, the asteroid is reflected both vertically and horizontally and it then continues with its random motion.
  13. If an Asteroid is hit by a missile it is immediately destroyed.
  14. If a destroyer hits any of the sides, all the destroyers velocity are reflected horizontally.
  15. Destroyers fire a missile straight down periodically. If a destroyer is hit by any missle then they are removed.
  16. If the player destroy all destroyers the boss stage begins with the boss behaving directly as other destroyers except with a higher velocity, faster shooting pace, and three lives.
  17. If a missile hits any of the windows sides its destroyed. If it hits a spaceObject, both the object and the space missile are destroyed. If it hits a Falcon, the falcon loses a life and is reset.
  18. If the Falcon kills the boss or vice versa, the end of game procedure is updated.

Open questions

  1. How are we supposed to keep track of all the missiles? Do we need a data structure?
  2. How are we going to make the shoot sound every time the Falcon fires a missile?
  3. How are we going to keep track of the all the asteroids roaming the space?
  4. How are we going to make the asteroids move randomly?