added documentation

src/com/sagi/dayan/Games/Elements/AnimatedSprite.java

@@ -10,7 +10,7 @@ import javax.imageio.ImageIO;
 import javax.swing.JPanel;
 
 /**
- * Created by sagi on 2/10/16.
+ * AnimatedSprite represents a sprite with animated img
  */
 public abstract class AnimatedSprite extends Sprite {
     protected Vector<Animation> animations;
@@ -20,6 +20,7 @@ public abstract class AnimatedSprite extends Sprite {
     public AnimatedSprite(int x, int y, int w, int h, int acc, String imgName, double angle, int sWidth, int sHeight, int numOfFirstFrames) {
         super(x, y, w, h, acc, imgName, angle, sWidth, sHeight);
         animations = new Vector<>();
+        //start first animation of set of animations
         initFirstAnimation(imgName, numOfFirstFrames);
         currentAnimation = 0;
 
@@ -27,6 +28,7 @@ public abstract class AnimatedSprite extends Sprite {
 
     protected abstract void initFirstAnimation(String spriteSheet, int numOfFirstFrames);
 
+    //draw each time the correct image of the animation
     @Override
     public void drawSprite(Graphics g, JPanel p) {
         if(animations.size() == 0)
@@ -35,6 +37,8 @@ public abstract class AnimatedSprite extends Sprite {
         g2d.rotate(Math.toRadians(angle), locX + (bImage.getWidth() / 2), locY + (bImage.getHeight() / 2));
         g.drawImage(animations.get(currentAnimation).getCurrentFrame(), locX, locY, p);
         g2d.rotate(-1 * Math.toRadians(angle), locX + (bImage.getWidth() / 2), locY + (bImage.getHeight() / 2));
+
+        //fix img if it goes beyond screen borders
         if(screenLoop) {
             drawScreenLoopFix(g, p);
             outOfScreeFix();
@@ -47,10 +51,12 @@ public abstract class AnimatedSprite extends Sprite {
         super.drawScreenLoopFix(g,p);
     }
 
+    //gets current used frame from animation
     public int getFrameNum(){
     	return animations.get(currentAnimation).getFrameIndex();
     }
 
+    //decide which animation to play. go back to start if finished
     public void setCurrentAnimation(int animation){
         if(animation < 0){
             throw new IllegalArgumentException("Animation index cant be negative");
@@ -66,6 +72,7 @@ public abstract class AnimatedSprite extends Sprite {
     }
 
 
+    //a class to represent an animation in SpriteAnimation
     protected class Animation {
 
         private int totalLoopTime;
@@ -100,13 +107,18 @@ public abstract class AnimatedSprite extends Sprite {
 
         }
 
+
+        //returns current played frame index
         public int getFrameIndex() { return currentFrame;}
 
+
+        //add more frames if animation changed
         private void addFrame(BufferedImage image, double frameLength) {
             frames.add(new AnimationFrame(image, totalLoopTime,frameLength));
             totalLoopTime += frameLength;
         }
 
+        //returns current played frame
         public BufferedImage getCurrentFrame() {
             long now = System.currentTimeMillis();
             long delta = now - startingTime;
@@ -121,6 +133,7 @@ public abstract class AnimatedSprite extends Sprite {
             return frames.get(currentFrame).getFrame();
         }
 
+        //represents a single frame from animation
         protected class AnimationFrame {
             private double startTime, endTime;
             private BufferedImage frame;

src/com/sagi/dayan/Games/Elements/Background.java

@@ -1,7 +1,7 @@
 package com.sagi.dayan.Games.Elements;
 
 /**
- * Created by sagi on 2/20/16.
+ * Represents background for the game
  */
 public class Background extends Sprite {
     public Background(int x, int y, int w, int h, int acc, String imgName, double angle, int sWidth, int sHeight) {

src/com/sagi/dayan/Games/Elements/Blast.java

@@ -2,6 +2,9 @@ package com.sagi.dayan.Games.Elements;
 
 import com.sagi.dayan.Games.Elements.AnimatedSprite.Animation;
 
+/*
+	represents a blast when player ship explodes
+ */
 public class Blast extends AnimatedSprite {
 
 	protected boolean isDone;
@@ -18,6 +21,7 @@ public class Blast extends AnimatedSprite {
 		animations.add(new Animation("explosion.png", 16, 500));
 	}
 
+	//set done when finished iterating on all frames
 	@Override
 	public void update() {
 		System.out.println("curr: "+currentAnimation+", total: "+numOfFirstFrames);

src/com/sagi/dayan/Games/Elements/EnemyShip.java

@@ -4,7 +4,7 @@ package com.sagi.dayan.Games.Elements;
 import com.sagi.dayan.Games.Utils.Utils;
 
 /**
- * Created by sagi on 2/20/16.
+ * represents an enemy ship
  */
 public class EnemyShip extends AnimatedSprite {
     protected int currentStep;
@@ -15,6 +15,7 @@ public class EnemyShip extends AnimatedSprite {
     protected int hitsToDestroy;
     protected boolean isDone;
     protected long startExploded;
+
     public EnemyShip(int x, int y, int w, int h, int acc, String imgName, double angle, int sWidth, int sHeight,double fireDelay, double stepDelay, Wave wave, int[] moveVector,int numOfFirstFrames, int hitsToDestroy) {
         super(x, y, w, h, acc, imgName, angle, sWidth, sHeight, numOfFirstFrames);
         this.fireDelay = fireDelay;
@@ -28,6 +29,7 @@ public class EnemyShip extends AnimatedSprite {
 
     }
 
+    //add enemy ship and blast animation
     @Override
     protected void initFirstAnimation(String spriteSheet, int numOfFirstFrames) {
         if(imageName == "L1-ES2.png"){
@@ -58,6 +60,7 @@ public class EnemyShip extends AnimatedSprite {
         locX += acceleration * Math.cos(Math.toRadians(moveVector[currentStep]));
         locY -= acceleration * -1* Math.sin(Math.toRadians(moveVector[currentStep]));
     }
+    //when enemy gets hit- lower life and set explosion sound if dead
     public void gotHit() {
         hitsToDestroy--;
         if(hitsToDestroy == 0){
@@ -66,8 +69,8 @@ public class EnemyShip extends AnimatedSprite {
             currentAnimation++;
             Utils.playSound("enemy_exp.wav");
         }
-        System.out.println("GOT HIT " + hitsToDestroy);
     }
+
     public boolean isDead() {
         return hitsToDestroy <= 0;
     }

src/com/sagi/dayan/Games/Elements/MenuBoxSprite.java

@@ -1,7 +1,7 @@
 package com.sagi.dayan.Games.Elements;
 
 /**
- * Created by sagi on 2/24/16.
+ * Animation for box in main menu
  */
 public class MenuBoxSprite extends AnimatedSprite {
     public MenuBoxSprite(int x, int y, int w, int h, int acc, String imgName, double angle, int sWidth, int sHeight, int numOfFirstFrames) {

src/com/sagi/dayan/Games/Elements/Missile.java

@@ -1,7 +1,7 @@
 package com.sagi.dayan.Games.Elements;
 
 /**
- * Created by sagi on 2/20/16.
+ * represents a missile of enemy/player ship
  */
 public class Missile extends AnimatedSprite {
 

src/com/sagi/dayan/Games/Elements/Player.java

@@ -5,7 +5,7 @@ import java.awt.Graphics;
 import javax.swing.JPanel;
 
 /**
- * Created by sagi on 2/20/16.
+ * Represents a player ship
  */
 public class Player extends AnimatedSprite {
     private final int NORMAL_ANIMATION = 0, RIGHT_ANIMATION = 1, LEFT_ANIMATION = 2, PADDING_BOTTOM = 35, MORTAL_DELAY = 3;
@@ -46,6 +46,7 @@ public class Player extends AnimatedSprite {
         isGameOver = gameOver;
     }
 
+    //when player revived  - reset it to default position
     public void resetPlayer(){
         locX = startX;
         locY = startY;
@@ -68,6 +69,7 @@ public class Player extends AnimatedSprite {
         return isMortal;
     }
 
+    //besides position update, updated whether ship can fire or not
     @Override
     public void update() {
         long now = System.currentTimeMillis();
@@ -90,17 +92,14 @@ public class Player extends AnimatedSprite {
             locY = pHeight - animations.get(currentAnimation).getCurrentFrame().getHeight() - PADDING_BOTTOM;
         }
 
-        if(isGameOver){
-            //System.exit(1);
-        }
 
 
     }
 
+    //set horizontal and vertical direction
     public void sethDirection(int direction) {
         this.hDirection = direction;
     }
-
     public void setvDirection(int direction) {
         this.vDirection = direction;
         if(direction != NORMAL_ANIMATION){
@@ -127,10 +126,13 @@ public class Player extends AnimatedSprite {
         this.fireDelay = fireDelay;
     }
 
+    //update time since last fired
     public void updateFireTime(){
         lastFired = System.currentTimeMillis();
     }
 
+
+    //if player was dead dont draw (creates blinking effect)
     @Override
     public void drawSprite(Graphics g, JPanel p){
         long now = System.currentTimeMillis();

src/com/sagi/dayan/Games/Elements/Wave.java

@@ -11,19 +11,20 @@ import com.sagi.dayan.Games.Stage.Level;
 import com.sagi.dayan.Games.Utils.Utils;
 
 /**
- * Created by sagi on 3/11/16.
+ * represents a single wave of enemy ships.
+ * this class will manage a wave of enemies, create them when needed & create missiles when needed.
+ * timing of creating and shooting is done using system time.
  */
 public class Wave {
 
-    protected Level level;
+    protected Level level;      //used to ask for a misslie to be created
-    protected  int enemyMaxAmount, currentAmount, acc, startX, startY;
+    protected  int enemyMaxAmount, currentAmount, hitsToDestroy, acc, startX, startY;
     protected double stepDelay,fireDelay, launchDelay;
     protected int[] moveVector;
     protected Vector<EnemyShip> enemies;
     protected Vector<Missile> bullets;
     protected long lastLaunchTime;
     protected String imageName;
-    protected int hitsToDestroy;
     protected Random r;
     protected boolean isShipOfTypeOne;
 
@@ -44,24 +45,30 @@ public class Wave {
         this.lastLaunchTime = System.currentTimeMillis();
         this.hitsToDestroy = hitsToDestroy;
         this.r = new Random();
+
+        //decides which ship img to use
         int odds = r.nextInt(100);
         isShipOfTypeOne = (odds > 60) ? true : false;
     }
 
+
     public void update(){
         long now = System.currentTimeMillis();
         Vector <EnemyShip> enemiesToRemove = new Vector<>();
+
+        // Create (RANDOM) new enemy if enough time passed since last launch (launchDelay)
         if(now - lastLaunchTime >= launchDelay * 1000 && currentAmount <= enemyMaxAmount){
-            // Create (RANDOM) new enemy
+            //choose img
             if(isShipOfTypeOne){
             enemies.add(new EnemyShip(startX, startY, level.getStageHeight(), level.getStageHeight(), acc, imageName, 0, 15, 15, fireDelay, stepDelay, this, moveVector, 8, hitsToDestroy));
             }else{
                 enemies.add(new EnemyShip(startX, startY, level.getStageHeight(), level.getStageHeight(), acc, "L1-ES2.png", 0, 15, 15, fireDelay, stepDelay, this, moveVector, 2, hitsToDestroy));
             }
             Utils.playSound("enemy_enter.wav");
-            lastLaunchTime = now;
+            lastLaunchTime = now;   //save new time
             currentAmount++;
         }
+        //update enemies & missiles, and remove the ones who are dead\OOS
         for (int i = 0; i < enemies.size() ; i++){
             enemies.get(i).update();
             if (enemies.get(i).isDone()  || enemies.get(i).isOutOfScreen()) {
@@ -76,6 +83,7 @@ public class Wave {
 
     }
 
+    //render missiles and enemy ships
     public void render(Graphics g, JPanel p){
         for (int i = 0; i < bullets.size() ; i++){
             bullets.get(i).drawSprite(g, p);
@@ -85,6 +93,7 @@ public class Wave {
         }
     }
 
+    //if enemy is not dead create a new missile
     public void fireFromEnemy(EnemyShip e){
     	if(!e.isDead()) {
             level.enemyFire(e.getCenterX(), (int) (e.getLocY() + e.getsHeight()), -(e.getAcceleration() + 2));
@@ -92,13 +101,17 @@ public class Wave {
         }
     }
 
+    //returns all enemys in wave
     public Vector <EnemyShip> getEnemies() {
         return enemies;
     }
 
+    //used when an enemy gets hit to remove life
     public void enemyHit(EnemyShip es) {
         es.gotHit();
     }
+
+    //returns true if all enemy ships launched and died or OOS
     public boolean isWaveOver() {
         return enemies.size() == 0 && currentAmount >= enemyMaxAmount;
     }

src/com/sagi/dayan/Games/Engine/GameEngine.java

@@ -23,10 +23,14 @@ import com.sagi.dayan.Games.Utils.Utils;
 import com.sagi.dayan.Games.Utils.WaveConfigs;
 
 
+/**
+ *  this class is the game engine
+ *  it updates and renders the current scene (i.e. start menu, stages etc.)
+ */
 
 public class GameEngine {
-    private final int CREDIT_TIME = 10;
+    private final int CREDIT_TIME = 10, FULL_HEALTH = 100; //timeout for credits
-    public boolean gameOn , gameOver, isFirstGame;
+    public boolean gameOn , gameOver, isFirstGame;  //flags to determine game state
     private JFrame frame;
     private int pWidth, pHeight, numOfPlayers;	//panel dimensions
     private Random r;
@@ -34,13 +38,14 @@ public class GameEngine {
     private Scene scene;
     private int p1CreditTime, p2CreditTime, creditTickTime = 1;
     public static final int PLAYER_WIDTH = 120, PLAYER_HEIGHT = 120;
-    public static final int UP=0,RIGHT=1,DOWN=2, LEFT=3, FIRE=4, USE_CREDIT=5;
-    public int p1HighScore, p2HighScore;
 
+    //player 1 & 2 controls
+    public static final int UP=0,RIGHT=1,DOWN=2, LEFT=3, FIRE=4, USE_CREDIT=5;
     private int[] p1Controlles = {KeyEvent.VK_UP, KeyEvent.VK_RIGHT, KeyEvent.VK_DOWN, KeyEvent.VK_LEFT, KeyEvent.VK_K, KeyEvent.VK_J};
     private int[] p2Controlles = {KeyEvent.VK_W, KeyEvent.VK_D, KeyEvent.VK_S, KeyEvent.VK_A, KeyEvent.VK_Q, KeyEvent.VK_Z};
 
     private int p1Lives, p2Lives, p1Health, p2Health, credits, p1Score, p2Score;
+    public int p1HighScore, p2HighScore;
 
     private long lastP1CreditTick, lastP2CreditTick;
 
@@ -49,6 +54,8 @@ public class GameEngine {
     private WaveConfigs waveConfigs;
     private int currentLevel;
 
+
+
     public GameEngine(int width, int height, Stage stage){
     	p1HighScore =  p2HighScore = 0;
         this.isFirstGame = true;
@@ -69,24 +76,21 @@ public class GameEngine {
             gameFont = null;
         }
         this.waveConfigs = new WaveConfigs();
-        startNewGame();
 
+        startNewGame(); //initialize a new game
     }
 
 
+    //reset player health to full health
     private void resetPlayerHealth(int i){
         if (i==0){
-            p1Health = 100;
+            p1Health = FULL_HEALTH;
         }
         else{
-            p2Health = 100;
+            p2Health = FULL_HEALTH;
         }
     }
 
-
-
-
-
     /**
      * initialize and reset vars and timers to "new game" configuration.
      */
@@ -121,8 +125,6 @@ public class GameEngine {
     }
 
 
-
-
     /**
      * returns gameOver flag
      * @return
@@ -133,11 +135,8 @@ public class GameEngine {
     }
 
 
-
-
-
     /**
-     * Update all sprites, including collision handling.
+     * Update all scenes
      */
     public void update(){
         long now = System.currentTimeMillis();
@@ -160,14 +159,15 @@ public class GameEngine {
         return scene.getSceneImage();
     }
 
+    //initializes a new game
     public void startGame(int numOfPlayers){
         this.numOfPlayers = numOfPlayers;
         startNewGame();
         changeLevel();
     }
 
+    //move to next level (scene) and attach listeners
     public void changeLevel(){
-    	System.out.println("current level: "+currentLevel);
         currentLevel++;
         stage.removeMouseListener(scene);
         stage.removeKeyListener(scene);
@@ -199,7 +199,7 @@ public class GameEngine {
         stage.addMouseListener(scene);
     }
 
-
+    //load controls menu
     public void goToSettings() {
         stage.removeMouseListener(scene);
         stage.removeKeyListener(scene);
@@ -251,10 +251,10 @@ public class GameEngine {
         credits--;
     }
     
+    //when a player uses a credit - reset health, lives and consume credit
     public void revivePlayer(int i)
     {
 		useCredit();
-
     	if(i==0){
     		p1Health=100;
 			p1Lives =3;
@@ -266,7 +266,7 @@ public class GameEngine {
 
     }
     
-
+    //add score to the correct player
     public void setScore(int i, int score)
     {
         if (i == 0) {
@@ -275,6 +275,10 @@ public class GameEngine {
             p2Score += score;
         }
     }
+
+
+    // if a player gets hit - consume health
+    //if health is 0 - consume life
     public void setPlayerHealth(int i, int strike) {
         if (i == 0) {
             p1Health += strike;
@@ -301,6 +305,7 @@ public class GameEngine {
         }
     }
 
+    //go to main menu
     public void goToMenu(){
         stage.removeMouseListener(scene);
         stage.removeKeyListener(scene);

src/com/sagi/dayan/Games/Stage/BlitzStage.java

@@ -6,7 +6,8 @@ import com.sagi.dayan.Games.Utils.WaveConfig;
 import com.sagi.dayan.Games.Utils.WaveConfigs;
 
 /**
- * Created by sagi on 3/19/16.
+ * Holds specific stage data
+ * like: number of waves, wave types, num of enemies in each wave, launch delay etc.
  */
 public class BlitzStage extends Level{
 	
@@ -20,7 +21,6 @@ public class BlitzStage extends Level{
     @Override
     protected void launchWave(long now) {
         lastWaveTime = now;
-        System.out.println("New Wave!! " + currentWave + ", Time: " + now);
         WaveConfig wc;
         int numOfEnemies = 5, numOfHits = 1;
         double launchDelay = 0.5, fireDelay = 5;

src/com/sagi/dayan/Games/Stage/FifthStage.java

@@ -6,7 +6,8 @@ import com.sagi.dayan.Games.Utils.WaveConfig;
 import com.sagi.dayan.Games.Utils.WaveConfigs;
 
 /**
- * Created by sagi on 3/19/16.
+ * Holds specific stage data
+ * like: number of waves, wave types, num of enemies in each wave, launch delay etc.
  */
 public class FifthStage extends Level{
 	
@@ -20,7 +21,6 @@ public class FifthStage extends Level{
     @Override
     protected void launchWave(long now) {
         lastWaveTime = now;
-        System.out.println("New Wave!! " + currentWave + ", Time: " + now);
         WaveConfig wc;
         int numOfEnemies = 5, numOfHits = 1;
         double launchDelay = 0.5, fireDelay = 5;

src/com/sagi/dayan/Games/Stage/FirstStage.java

@@ -6,7 +6,8 @@ import com.sagi.dayan.Games.Utils.WaveConfig;
 import com.sagi.dayan.Games.Utils.WaveConfigs;
 
 /**
- * Created by sagi on 3/19/16.
+ * Holds specific stage data
+ * like: number of waves, wave types, num of enemies in each wave, launch delay etc.
  */
 public class FirstStage extends Level{
 	
@@ -20,7 +21,6 @@ public class FirstStage extends Level{
     @Override
     protected void launchWave(long now) {
         lastWaveTime = now;
-        System.out.println("New Wave!! " + currentWave + ", Time: " + now);
         WaveConfig wc;
         int numOfEnemies = 5, numOfHits = 1;
         double launchDelay = 0.5, fireDelay = 5;

src/com/sagi/dayan/Games/Stage/FourthStage.java

@@ -6,7 +6,8 @@ import com.sagi.dayan.Games.Utils.WaveConfig;
 import com.sagi.dayan.Games.Utils.WaveConfigs;
 
 /**
- * Created by sagi on 3/19/16.
+ * Holds specific stage data
+ * like: number of waves, wave types, num of enemies in each wave, launch delay etc.
  */
 public class FourthStage extends Level{
 	
@@ -20,7 +21,6 @@ public class FourthStage extends Level{
     @Override
     protected void launchWave(long now) {
         lastWaveTime = now;
-        System.out.println("New Wave!! " + currentWave + ", Time: " + now);
         WaveConfig wc;
         int numOfEnemies = 5, numOfHits = 1;
         double launchDelay = 0.5, fireDelay = 5;

src/com/sagi/dayan/Games/Stage/Level.java

@@ -25,38 +25,40 @@ import com.sagi.dayan.Games.Engine.GameEngine;
 import com.sagi.dayan.Games.Utils.Utils;
 
 /**
- * Created by sagi on 2/20/16.
+ * This class holds all the logic for all the stages.
+ * stages themselfs contain only specific stage data.
  */
 public abstract class Level extends Scene {
 	protected final double PRESS_START_PULE = 0.3;
-	protected boolean toDrawStart;
+	protected boolean toDrawStart, isStarted;
+	protected int p1Speed = 10,currentWave, startingAnimationIndex, numOfPlayers, numOfWaves;
+
+	// used to save all players, missiles, enemy waves and blasts
 	protected Vector<Player> players;
-	protected int p1Speed = 10;
 	protected Vector<Missile> p1Missiles, p2Missiles, enemyMissiles;
-	protected Background bg;
-	protected int[] waveDelay;
-	protected int currentWave;
-	protected int[] yAxisStartingAnimation;
-	protected int startingAnimationIndex;
-	protected boolean isStarted;
 	protected Vector<Wave> waves;
 	protected Vector<Blast> blasts;
-	protected int numOfPlayers;
+	protected Background bg;
+	protected int[] yAxisStartingAnimation, waveDelay;
+
+
 	protected Map<Integer, Boolean> keys;
 	protected String title;
 	protected JLabel stageTitle;
 	protected long lastWaveTime, lastPulseTime;
-	protected int numOfWaves;
 
 
 
 	public Level(int width, int height, int numOfPlayers, GameEngine engine, String stageTitle, int[] waveDelay){
 		super(width, height, engine);
+		//initialize vectors
 		players = new Vector<>();
 		p1Missiles = new Vector<>();
 		p2Missiles = new Vector<>();
-		blasts = new Vector<Blast>();
+		blasts = new Vector<>();
 		enemyMissiles = new Vector<>();
+
+		//save additional information
 		this.waveDelay = waveDelay;
 		this.lastWaveTime = System.currentTimeMillis();
 		this.currentWave = 0;
@@ -70,6 +72,8 @@ public abstract class Level extends Scene {
 		this.title = stageTitle;
 		this.stageTitle = new JLabel(this.title);
 
+
+		//create requierd amount of players
 		if(numOfPlayers == 1) {
 			players.add(new Player((width / 2) + (GameEngine.PLAYER_WIDTH / 2), yAxisStartingAnimation[startingAnimationIndex],
 					width, height, p1Speed, "emptyImage.png", 0, GameEngine.PLAYER_WIDTH, GameEngine.PLAYER_HEIGHT, "P1",6));
@@ -81,12 +85,14 @@ public abstract class Level extends Scene {
 
 		}
 
+		//initialize keys
 		setupKeys();
 		Utils.playSound("jetSound.wav");
 		lastPulseTime = System.currentTimeMillis();
 		toDrawStart = true;
 	}
 
+	//initialize player 1 & 2 keys
 	private void setupKeys() {
 		int[] p1 = engine.getP1Controlles();
 		for(int i = 0 ; i < p1.length ; i++){
@@ -104,15 +110,18 @@ public abstract class Level extends Scene {
 	public void update() {
 		bg.update();
 		movePlayers();
-		Vector <Wave> wavesToRemove = new Vector<>();
+
+		//vectors to hold objects that needs to be removed
+		Vector<Wave> wavesToRemove = new Vector<>();
 		Vector<Blast> blastTRM = new Vector<>();
 
+		//check if enough time has passed and a new wave needs to be launched
 		long now = System.currentTimeMillis();
-		//        if(currentWave < waveDelay.length && now - lastWaveTime >= waveDelay[currentWave] * 1000){
 		if(currentWave < numOfWaves && now - lastWaveTime >= waveDelay[currentWave] * 1000){
 			launchWave(now);
 		}
 
+		//if still in new game start animation - advance animation
 		if(startingAnimationIndex < 3 && !isStarted){
 			if(startingAnimationIndex == 0){
 				startingAnimationIndex++;
@@ -133,7 +142,10 @@ public abstract class Level extends Scene {
 					startingAnimationIndex++;
 				}
 			}
-		}else{
+		}
+		//if finished game start animation - update players, missiles, enemy waves
+		//if waves are done - remove them
+		else{
 			isStarted = true;
 			for(int i = 0 ; i < players.size() ; i++){
 				players.get(i).update();
@@ -152,40 +164,43 @@ public abstract class Level extends Scene {
 			for(int i = 0 ; i < waves.size() ; i++){
 				waves.get(i).update();
 				if(waves.get(i).isWaveOver()) {
-					System.out.println("in remove");
 					wavesToRemove.add(waves.get(i));
 				}
 			}
 			waves.removeAll(wavesToRemove);
 
+			//check and set high score
 			if(engine.getP1Score() > engine.getP1HighScore())
 				engine.setP1HighScore(engine.getP1Score());
 			if(engine.getP2Score() > engine.getP2HighScore())
 				engine.setP2HighScore(engine.getP2Score());
 		}
+
+		//check all collisions
 		checkCollision();
 		engine.setGameOver(isGameOver());
+
+		//if all waves are done switch stage
 		if(currentWave >= numOfWaves && waves.size()==0)
 		{
-			System.out.println("Done");
 			engine.changeLevel();
 		}
 
 
+		//remove finished blasts and update existing
 		for(int i =0; i<blasts.size();i++){
 			if (blasts.get(i).isDone()){
-				System.out.println("removing blast");
 				blastTRM.add(blasts.get(i));
 			}
 			blasts.get(i).update();
 		}
-
 		blasts.removeAll(blastTRM);
 
 	}
 
 	protected abstract void launchWave(long time);
 
+	//determine if game is over according to player 1 & 2
 	private boolean isGameOver(){
 		if(numOfPlayers == 1) {
 			return players.get(0).isGameOver();
@@ -194,6 +209,7 @@ public abstract class Level extends Scene {
 		}
 	}
 
+	//set player 1 & 2 movement direction
 	private void movePlayers() {
 		/**
 		 * Player 1 Movement:
@@ -272,6 +288,7 @@ public abstract class Level extends Scene {
 		}
 	}
 
+	//render all sprites and elements
 	@Override
 	public void render(JPanel p) {
 		sceneImage = new BufferedImage(this.stageWidth, this.stageHeight, Image.SCALE_FAST);
@@ -281,6 +298,7 @@ public abstract class Level extends Scene {
 		Color c = g.getColor();
 		Font f = engine.getGameFont();
 
+		//if game didn't start yet - print stage title
 		if(!isStarted){
 			if(f == null) {
 				f = g.getFont();
@@ -289,7 +307,6 @@ public abstract class Level extends Scene {
 			g.setColor(Color.DARK_GRAY);
 			g.setFont(f);
 
-
 			// Get the FontMetrics
 			FontMetrics metrics = g.getFontMetrics(f);
 			// Determine the X coordinate for the text
@@ -298,16 +315,13 @@ public abstract class Level extends Scene {
 			int y = ((stageHeight - metrics.getHeight()) / 2) - metrics.getAscent();
 			g.drawString(this.title, x, y);
 			g.setColor(c);
-
 		}
 
-
 		if (isGameOver())
 		{
 			try {
 				System.in.read();
 			} catch (IOException e) {
-				// TODO Auto-generated catch block
 				e.printStackTrace();
 			}
 		}
@@ -338,8 +352,7 @@ public abstract class Level extends Scene {
 		g.drawString("Credits: "+ engine.getCredits(), stageWidth/2, 30);
 
 
-
+		//draw all missiles
-
 		for(int i = 0 ; i < p1Missiles.size() ; i++){
 			p1Missiles.get(i).drawSprite(g,p);
 		}
@@ -349,6 +362,8 @@ public abstract class Level extends Scene {
 		for(int i = 0 ; i < enemyMissiles.size() ; i++){
 			enemyMissiles.get(i).drawSprite(g,p);
 		}
+
+		//draw player 1 & 2 details (score, health & lives)
 		for(int i = 0 ; i < players.size() ; i++){
 			if(i == 0){
 				if(engine.getP1Health() > 0){
@@ -376,10 +391,13 @@ public abstract class Level extends Scene {
 				}
 			}
 		}
+
+		//render all waves
 		for(int i = 0 ; i < waves.size() ; i++){
 			waves.get(i).render(g,p);
 		}
 
+		//render all blasts
 		for(int i =0; i<blasts.size();i++){
 			blasts.get(i).drawSprite(g, p);
 		}
@@ -425,7 +443,11 @@ public abstract class Level extends Scene {
 		}
 	}
 
+
+	//check all possible collisions
 	public void checkCollision() {
+
+		//vectors to store objects that needs to be removed
 		Vector<Missile> p1MTR, p2MTR, eMTR;
 		eMTR = new Vector<>();
 		p1MTR = new Vector<>();
@@ -456,12 +478,12 @@ public abstract class Level extends Scene {
 			//player vs. enemy missile
 			for (int j = 0; j < enemyMissiles.size(); j++) {
 				if(CollisionUtil.collidesWith(players.get(i),enemyMissiles.get(j))){
+					if ((i==0 && engine.getP1Health()==10) ||(i==1 && engine.getP2Health()==10)) {
+						blasts.add(new Blast((int) players.get(i).getLocX(), (int) players.get(i).getLocY(), "explosion.png", 15));
+					}
 					playerHit(i);
 					if(playerIsAlive(i)) {
 						eMTR.add(enemyMissiles.get(j));
-					}else{
-						blasts.add(new Blast((int)players.get(i).getLocX(),(int)players.get(i).getLocY(),"explosion.png",15));
-						Utils.playSound("player_exp.wav");
 					}
 				}
 			}
@@ -472,18 +494,19 @@ public abstract class Level extends Scene {
 				for (int k = 0; k < waves.get(j).getEnemies().size(); k++) {
 					if (CollisionUtil.collidesWith(waves.get(j).getEnemies().get(k), players.get(i))) {
 						if(!waves.get(j).getEnemies().get(k).isDead()){
+							if ((i==0 && engine.getP1Health()==10) || (i==1 && engine.getP2Health()==10)) {
+								blasts.add(new Blast((int) players.get(i).getLocX(), (int) players.get(i).getLocY(), "explosion.png", 15));
+							}
 							playerHit(i);
 						}
 						if(playerIsAlive(i)) {
 							waves.get(j).enemyHit(waves.get(j).getEnemies().get(k));
-						}else{
-							blasts.add(new Blast((int)players.get(i).getLocX(),(int)players.get(i).getLocY(),"explosion.png",15));
-
 						}
 					}
 				}
 			}
 
+			//check for each player seperatly for score
 			//player 1 missile vs. enemy
 			if(i == 0){
 				for(int m = 0 ; m < p1Missiles.size() ; m++){
@@ -502,7 +525,7 @@ public abstract class Level extends Scene {
 
 			}
 
-			//player 1 missile vs. enemy
+			//player 2 missile vs. enemy
 			else {
 				for(int m = 0 ; m < p2Missiles.size() ; m++){
 					for (int j = 0; j < waves.size(); j++) {
@@ -522,14 +545,14 @@ public abstract class Level extends Scene {
 		}
 
 
-
+		//remove all objects that needs to be removed
-
 		p1Missiles.removeAll(p1MTR);
 		p2Missiles.removeAll(p2MTR);
 		enemyMissiles.removeAll(eMTR);
 
 	}
 
+	//checks if player is alive
 	protected boolean playerIsAlive(int i){
 		if(i == 0){
 			return !(engine.getP1Lives() <= 0);
@@ -538,6 +561,7 @@ public abstract class Level extends Scene {
 		}
 	}
 
+	//reduce player health and play hit audio
 	protected void playerHit(int i){
 		if(players.get(i).isMortal()){
 			Utils.playSound((i == 0) ? "player_1_hit.wav" : "player_2_hit.wav");
@@ -554,6 +578,7 @@ public abstract class Level extends Scene {
 		}
 	}
 
+	//create a new enemy missile
 	public void enemyFire(int x, int y, int acc) {
 		enemyMissiles.add(new Missile(x, y,getStageWidth(),getStageHeight(), acc,"E1-Fire.png", 15));
 	}

src/com/sagi/dayan/Games/Stage/MainMenuScene.java

@@ -17,7 +17,7 @@ import com.sagi.dayan.Games.Engine.GameEngine;
 import com.sagi.dayan.Games.Utils.Utils;
 
 /**
- * Created by sagi on 2/24/16.
+ * represent the main menu scene.
  */
 public class MainMenuScene extends Scene {
 
@@ -48,6 +48,7 @@ public class MainMenuScene extends Scene {
 
     }
 
+    //render all objects and players high scores
     @Override
     public void render(JPanel p) {
         sceneImage = new BufferedImage(this.stageWidth, this.stageHeight, Image.SCALE_FAST);
@@ -80,6 +81,7 @@ public class MainMenuScene extends Scene {
 
     }
 
+    //key listener for moving and selecting option in the main menu
     @Override
     public void keyPressed(KeyEvent keyEvent) {
         switch (keyEvent.getKeyCode()){

src/com/sagi/dayan/Games/Stage/Scene.java

@@ -1,7 +1,7 @@
 package com.sagi.dayan.Games.Stage;
 
 /**
- * Created by sagi on 2/8/16.
+ * Represents a Scene in the game (i.e. main menu, stage etc.)
  */
 
 import java.awt.event.KeyListener;
@@ -14,14 +14,6 @@ import com.sagi.dayan.Games.Engine.GameEngine;
 
 public abstract class Scene extends MouseAdapter implements KeyListener{
 
-    public int getStageWidth() {
-        return stageWidth;
-    }
-
-    public int getStageHeight() {
-        return stageHeight;
-    }
-
     protected int stageWidth, stageHeight;
     protected BufferedImage sceneImage;
     protected GameEngine engine;
@@ -32,6 +24,14 @@ public abstract class Scene extends MouseAdapter implements KeyListener{
         this.engine = engine;
     }
 
+    //get dimentions
+    public int getStageWidth() {
+        return stageWidth;
+    }
+    public int getStageHeight() {
+        return stageHeight;
+    }
+
     public abstract void update ();
 
     public abstract void render(JPanel p);

src/com/sagi/dayan/Games/Stage/SecondStage.java

@@ -6,7 +6,8 @@ import com.sagi.dayan.Games.Utils.WaveConfig;
 import com.sagi.dayan.Games.Utils.WaveConfigs;
 
 /**
- * Created by sagi on 3/19/16.
+ * Holds specific stage data
+ * like: number of waves, wave types, num of enemies in each wave, launch delay etc.
  */
 public class SecondStage extends Level{
 	
@@ -20,7 +21,6 @@ public class SecondStage extends Level{
     @Override
     protected void launchWave(long now) {
         lastWaveTime = now;
-        System.out.println("New Wave!! " + currentWave + ", Time: " + now);
         WaveConfig wc;
         int numOfEnemies = 5, numOfHits = 1;
         double launchDelay = 0.5, fireDelay = 5;

src/com/sagi/dayan/Games/Stage/SettingsMenuScene.java

@@ -15,7 +15,8 @@ import com.sagi.dayan.Games.Utils.Utils;
 //import sun.audio.AudioStream;
 
 /**
- * Created by sagi on 2/27/16.
+ * Settings menu - currently controls menu.
+ * not possible to change keys yet
  */
 public class SettingsMenuScene extends Scene {
     private BufferedImage background;

src/com/sagi/dayan/Games/Stage/SixthStage.java

@@ -6,7 +6,8 @@ import com.sagi.dayan.Games.Utils.WaveConfig;
 import com.sagi.dayan.Games.Utils.WaveConfigs;
 
 /**
- * Created by sagi on 3/19/16.
+ * Holds specific stage data
+ * like: number of waves, wave types, num of enemies in each wave, launch delay etc.
  */
 public class SixthStage extends Level{
 	
@@ -20,7 +21,6 @@ public class SixthStage extends Level{
     @Override
     protected void launchWave(long now) {
         lastWaveTime = now;
-        System.out.println("New Wave!! " + currentWave + ", Time: " + now);
         WaveConfig wc;
         int numOfEnemies = 5, numOfHits = 1;
         double launchDelay = 0.5, fireDelay = 5;

src/com/sagi/dayan/Games/Stage/Stage.java

@@ -8,7 +8,7 @@ import javax.swing.JPanel;
 import com.sagi.dayan.Games.Engine.GameEngine;
 
 /**
- * Created by sagi on 2/8/16.
+ * represtent a specific game stage
  */
 public class Stage extends JPanel implements Runnable{
 

src/com/sagi/dayan/Games/Stage/ThirdStage.java

@@ -6,7 +6,8 @@ import com.sagi.dayan.Games.Utils.WaveConfig;
 import com.sagi.dayan.Games.Utils.WaveConfigs;
 
 /**
- * Created by sagi on 3/19/16.
+ * Holds specific stage data
+ * like: number of waves, wave types, num of enemies in each wave, launch delay etc.
  */
 public class ThirdStage extends Level{
 	
@@ -20,7 +21,6 @@ public class ThirdStage extends Level{
     @Override
     protected void launchWave(long now) {
         lastWaveTime = now;
-        System.out.println("New Wave!! " + currentWave + ", Time: " + now);
         WaveConfig wc;
         int numOfEnemies = 5, numOfHits = 1;
         double launchDelay = 0.5, fireDelay = 5;

src/com/sagi/dayan/Games/Utils/WaveConfig.java

@@ -1,7 +1,7 @@
 package com.sagi.dayan.Games.Utils;
 
 /**
- * Created by sagi on 3/18/16.
+ * this class configures the structure of a wave
  */
 public  class WaveConfig {
     protected int[] moveVector;

src/com/sagi/dayan/Games/Utils/WaveConfigs.java

@@ -3,11 +3,10 @@ package com.sagi.dayan.Games.Utils;
 import java.util.Vector;
 
 /**
- * Created by sagi on 3/18/16.
+ * this class configs settings and movement vector for different kinds of waves
  */
 public class WaveConfigs  {
-    public static final int DEMO = 0;//, UPPER_MIDDLE_LEFT=0, UPPER_MIDDLE_RIGHT=1;
+    public static final int DEMO = 0;
-    //public static final int UPPER_LEFT = 2, UPPER_RIGHT=3;
     Vector<WaveConfig> configs;
 
     public WaveConfigs(){
@@ -40,6 +39,7 @@ public class WaveConfigs  {
 
     }
 
+    //return requested wave configuration
     public WaveConfig getWaveConfig(int config){
         if (config < 0 || configs.size() <= config)
             throw new IllegalArgumentException("no such config...");