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Game of Space Invaders created in Java without any game engine.

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Space Invaders

Game of Space Invaders created in Java without any game engine.

Runnable JAR can be found at SpaceInvaders/readme-resources/SpaceInvaders-MiroslavJelaska.jar

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Preview of Space Invaders Game in Java (without game engine)

Game elements

Visual representation Package and class name Type
JFrame and Canvas game.Game (javax.swing.JFrame and java.awt.Canvas) ui
GameOverScreenOverlay - You Won GameOverScreenOverlay - You Lost ui.GameOverScreenOverlay ui
StatusRibbon ui.StatusRibbon ui
HeroShip actors.HeroShip actor
HeroProjectile actors.HeroProjectile actor
InvaderShip actors.InvaderShip actor
InvaderProjectile actors.InvaderProjectile actor
Explosion vfx.Explosion vfx

Execution flow

Explosion

Game mechanics

Controls

Action Key
⤎ Move Left   A      
Move Right ⤏  D      
Shoot 💥 Spacebar

Points

Points are gained by destroying invader ships, 100 points per each. Bonus points are added for each destroyed ship depending on the time it was destroyed. The sooner in gameplay ship gets destroyed the more bonus points are gained.

Bonus points are given by following function:

  BonusPoints(time) = 1000 points * e^(-0.1 * time)

This is actualy function of exponential decay where total amount N0 is 1000 and exponential decay constant 𝛌 is 0.1 within general formula equation.

Bonus points plot

Code snippet

  private static final int TotalBonusPoints = 1000;
  private static final double ExponentialDecayConstant = -0.1;
  private int bonusPointsWithExponentialDecay(long time){
      return (int)(TotalBonusPoints * Math.exp(ExponentialDecayConstant * time));
  }

Other

Useful resources

Color scheme

Color scheme is inspired by "monokai" color scheme. Colors used in game are:

  • #231f20 #231f20 (Game background)
  • #FFFFFF #FFFFFF (Hero)
  • #F92672 #F92672 (HeroProjectile)
  • #A6E22E #A6E22E (InvaderShip and StatusRibbon::Title)
  • #AE81FF #AE81FF (InvaderProjectile and Explosion)
  • #282828 #282828 (StatusRibbon::Background)
  • #E6DB74 #E6DB74 (StatusRibbon::Text)

Credits

Audio effects used in the game were downloaded from www.freesound.org and were under CC license. Here I'll mention authors and their audio tracks which were used in this game.

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Game of Space Invaders created in Java without any game engine.

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