Meteor.java

package com.badlogic.androidgames.mrnom;

public class Meteor {
    public int x, y;
	    
	    public Meteor(int x, int y) {
	        this.x = x;
	        this.y = y;
	    }
	    

}

world.java

public class World {
  static final int WORLD_WIDTH = 75;
	static final int WORLD_HEIGHT = 114;
	static final int SCORE_INCREMENT = 10;
	static final float TICK_INITIAL = 0.1f;
	static final float TICK_DECREMENT = 0.05f;

	public Astronaut astro;
	Meteor  meteor []= new Meteor[1000];
	public Coins coins;

	public boolean gameOver = false;;
	public int score = 0;

	boolean fields[][] = new boolean[WORLD_WIDTH][WORLD_HEIGHT];
	Random random = new Random();
	float tickTime = 0;
	float tick = TICK_INITIAL;
	int pUpX = 0;
	int pUpY = 0;
	boolean moved = false;
	int xSpeed = 0;
	int ySpeed = 0;
	int coinCount = 0;

	public World() {
		astro = new Astronaut();

		placeCoin();
		spawnMeteor();

	}

	// places coin in random place
	private void placeCoin() {
		String debug;

		for (int x = 0; x < WORLD_WIDTH; x++) {
			for (int y = 0; y < WORLD_HEIGHT; y++) {
				fields[x][y] = false;
			}
		}
		fields[pUpX][pUpY] = true;

		pUpX = random.nextInt(WORLD_WIDTH);
		pUpY = random.nextInt(WORLD_HEIGHT);

		while (true) {
			if (fields[pUpX][pUpY] == false)
				break;
			if (pUpX >= WORLD_WIDTH) {
				pUpX = 0;

				if (pUpY >= WORLD_HEIGHT) {
					pUpY = 0;
				}
			}
		}
		coins = new Coins(pUpX, pUpY, random.nextInt(3));

		debug = "  pUp x: -- " + pUpX + "   pUp y: -- " + pUpY + " TickTime: ";

		Log.d("Location of power up", debug);

	}

	// moves the meteor
	private void moveMeteor() {
		for (int i = 0; i < meteor.length; i++){
		meteor[i].y += xSpeed;
		meteor[i].x += ySpeed;

		if (meteor[i].x < 0)
			meteor[i].x = 81;
		if (meteor[i].x > 81)
			meteor[i].x = 0;
		if (meteor[i].y < 0)
			meteor[i].y = 118;
		if (meteor[i].y > 118)
			meteor[i].y = 0;
	}
	}

	// same method as coin spawns meteor at random speed at random direction.
	private void spawnMeteor() {
		int levels = 2;
		if (coinCount % 3 == 0) {
			levels = +2;
		}

		int tempX = random.nextInt(levels);
		int tempY = random.nextInt(levels);

		if (tempX == 0)
			xSpeed = 0;
		else if (tempX == 1)
			xSpeed = -1;
		else if (tempX == 2)
			xSpeed = 1;
		else if (tempX == 3)
			xSpeed = -2;
		else if (tempX == 4)
			xSpeed = 2;
		else if (tempX == 5)
			xSpeed = -3;
		else if (tempX == 6)
			xSpeed = 3;
		else if (tempX == 7)
			xSpeed = -4;
		else if (tempX == 8)
			xSpeed = 4;
		else if (tempX == 9)
			xSpeed = -5;
		else if (tempX == 10)
			xSpeed = 5;
		else if (tempX == 11)
			xSpeed = -6;
		else if (tempX == 12)
			xSpeed = 6;
		else if (tempX == 13)
			xSpeed = -7;
		else if (tempX == 14)
			xSpeed = 7;
		else if (tempX == 15)
			xSpeed = -8;
		else if (tempX == 16)
			xSpeed = 8;

		if (tempY == 0)
			ySpeed = 0;
		else if (tempY == 1)
			ySpeed = -1;
		else if (tempY == 2)
			ySpeed = 1;
		else if (tempY == 3)
			ySpeed = 2;
		else if (tempY == 4)
			ySpeed = -2;
		else if (tempY == 5)
			ySpeed = 3;
		else if (tempY == 6)
			ySpeed = -3;
		else if (tempY == 7)
			ySpeed = -4;
		else if (tempY == 8)
			ySpeed = 4;
		else if (tempY == 9)
			ySpeed = 5;
		else if (tempY == 10)
			ySpeed = -5;
		else if (tempY == 11)
			ySpeed = 6;
		else if (tempY == 12)
			ySpeed = -6;
		else if (tempY == 13)
			ySpeed = 7;
		else if (tempY == 14)
			ySpeed = -7;
		else if (tempY == 15)
			ySpeed = 8;
		else if (tempY == 16)
			ySpeed = -8;
		
		if (xSpeed ==0){
			ySpeed =1;
			
		}else if(ySpeed ==0){
			xSpeed =1;
			
		}

		for (int x = 0; x < WORLD_WIDTH; x++) {
			for (int y = 0; y < WORLD_HEIGHT; y++) {
				fields[x][y] = false;
			}
		}
		fields[pUpX][pUpY] = true;

		pUpX = random.nextInt(WORLD_WIDTH);
		pUpY = random.nextInt(WORLD_HEIGHT);

		while (true) {
			if (fields[pUpX][pUpY] == false)
				break;
			if (pUpX >= WORLD_WIDTH) {
				pUpX = 0;

				if (pUpY >= WORLD_HEIGHT) {
					pUpY = 0;
				}
			}
		}
		
		
		
		for(int i=0; i<meteor.length ;i++)
			
		meteor[i] = new Meteor(ppX, pUpY);
		
			
		

	}

	// updates screen
	public void update(float deltaTime) {

		if (gameOver)
			return;

		tickTime += deltaTime;

		while (tickTime > tick) {
			astro.advance();
			moveMeteor();
			moved = true;

			tickTime -= tick;
			score += deltaTime;
			for(int i =0; i< meteor.length; i++)
			if ((astro.player1.x <= meteor[i].x + 6 && astro.player1.y <= meteor[i].y + 6)
					&& (astro.player1.x >= meteor[i].x - 6 && astro.player1.y >= meteor[i].y - 6)) {
				gameOver = true;

				return;
			}

			if ((astro.player1.x <= coins.x + 10 && astro.player1.y <= coins.y + 10)
					&& (astro.player1.x >= coins.x - 10 && astro.player1.y >= coins.y - 10)) {

				placeCoin();
				moved = false;
				spawnMeteor();
				coinCount += 1;
				


				score += SCORE_INCREMENT;

			}

		}
	}

}