Having trouble loading a brick level

Newbie & Debugging Questions
#1

Hey guys. Sorry for another noob post. I’m still working on my brickbreaker game, but i’m having a bit of trouble figuring out how to set up levels, basically. Right now, i’ve got loading a square of bricks.


	public void loadBricks() {
		int i = 0;
		
		for(int j= 0; j < 5;j++) {
			for (int k = 0;k < 5; k++) {
			
			bricks[i] = new Brick(0,j*32+100,k*16 + 400);
			i++;
			
			}
		
		}
		
	}

Very basic as you see and definitely doesn’t do what I need it to do. This is in my game.java class.

And i’m drawing them like this:


batch.begin();
		
		for (int i = 0; i <bricks.length;i++)
		{
			if (bricks[i].isDestroyed == true) {
				bricks[i].brickRect.x = 0;
				bricks[i].brickRect.y = 0;
			}else{
			
			ball.checkBrickCollision(bricks[i]);
			
			
			bricks[i].draw(batch);
		}}
		
		ball.draw(batch);
		paddle.draw(batch);
		batch.end();
	}

I know I need to use a multidimensional array, but i’m having trouble implementing it. I hope this makes sense, i’m having a little trouble explaining my question…lol

Forgot to add, i’m using LibGDX. I have Game.java, Paddle.java, Ball.java, Brick.java classes.

#2

This is what i’ve got so far…I added a Level.java


package com.psillicoder.brickbreaker;

public class Level {
	final int BLANK = 0;
	final int BLUE = 1;
	
	int board[][] = new int[12][12];
	
	public Level() {
		int[][] board = new int[][] {
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,},
				{1,1,1,1,1,1,1,1,1,1,1,1,}
		};
	}

}

and in my loadlevel method in game.java, I have


	public void loadBricks() {
		int i = 0;
		
		for(int j= 0; j < 11;j++) {
			for (int k = 0;k < 11; k++) {
			
				if (level.board[j][k] != 0) {
			bricks[i] = new Brick(level.board[j][k],j*32,k*16 + 400);
			i++;
			}
			}
		
		}
		
	}

But i’m getting a nullpointer exception when trying to run bricks[i].draw(batch); which just draws the brick:

public void draw(SpriteBatch spritebatch)
{
spritebatch.draw(brickImage,brickRect.x,brickRect.y);
}

#3

You have empty parts of the array because your only setting what is not 0, when your drawing you will have to check its not null


If (block[x][y]] != null){
//draw
}

Or set the block to a air block which the remeer method doesn’t draw anything

#4

I commented that whole line of code out but i’m still getting a nullpointerexception. I’ve been going through the code and can’t figure out why.

[edit] I think I see what your saying…I need to rewrite all of this, it’s starting to become unmanagable.

#5

I’m trying to rewrite it using an Arraylist…I don’t think it’s going to work though. I’ve had enough for tonight lol.

#6

you have 2 x int[][] board. one is a class member, the other one is a local variable in the constructor.
you only fill the local variable, but then you use the class member, which will only contain 0’s.

#7

So I should declare the actual level information in the game class?

#8

Change


   public Level() {
      int[][] board = new int[][] { ...

to


   public Level() {
      board = new int[][] { ...

Edit: Basically, in the code you have, you create a whole new board array in your Level constructor, instead of setting the global board array. So the global board array you declared in the Level class outside the constructor was always filled with zeros since you initialized it to a blank array. If you change what I showed you, you’ll be accessing the global board variable and setting all its contents to ones.

#9

I wouldn’t recommend that, you should keep the integrity of the grid using your 2d array.

#10

When I do that, I get an error on the board variable saying “Syntax error on token “board”, VariableDeclaratorId expected after this token”

I even took a bunch of the variables out and replaced with numbers because I was getting errors. It seems like something is wrong…

#11 

public class Level {
	int[][] board;
	
	public Level() {
		board = new int[][] {
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,},
            {1,1,1,1,1,1,1,1,1,1,1,1,}
		};
	}
}