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

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

Do you like it? Show it by giving a ⭐️. 🚀

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

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 .

  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));
  }

• gameprogrammingpatterns.com (📖 Book)
• Killer Game Programming in Java (📖 Book)
• Ryan van Zeben :: Java 2D Game Engine Development (📺 YouTube)
• gamedev.stackexchange :: Tips for writing the main game loop? (📄 Article)
• higherorderfun.com :: Understanding the Game Main Loop (📄 Article)
• codeincomplete.com :: Javascript Game Foundations - The Game Loop (📄 Article)
• [The Java™ Tutorials :: Trail: 2D Graphics (📄 Official tutorials)] (http://docs.oracle.com/javase/tutorial/2d/index.html)
• [Fabien Sanglard's website :: Game timers: Issues and solutions. (📄 Article)] (http://fabiensanglard.net/timer_and_framerate/)
• ZetCode :: Java games tutorial (📄 Article collection)

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

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

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.

• THE_bizniss - laser.wav
• thatjeffcarter - inception sound 3.wav
• Julien Matthey - JM_FX_Boom 01a.wav
• qubodup - Organic Laser Shot