[1.10.2] Checking blocks around player

[DasKaktus]

Hi.

 

Is there a simplier way to check if the blocks around(with 1 spacce inbetween) the player is air than the following code.

The code seems so ugly..

 

BlockPos posStart = player.getPosition();
if(world.getBlockState(posStart.north(2)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.north(2).east(1)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.north(2).east(2)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.north(2).west(1)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.north(2).west(2)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.south(2)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.south(2).east(1)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.south(2).east(2)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.south(2).west(1)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.south(2).west(2)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.west(2)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.west(2).north(1)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.west(2).south(1)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.east(2)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.east(2).north(1)).getBlock() == Blocks.AIR &&
world.getBlockState(posStart.east(2).south(1)).getBlock() == Blocks.AIR){								

}

[Matryoshika]

For-loops are your friend.

Reference another method that returns a boolean.

public boolean checkBlocks(World world, BlockPos playerPos){
//Check in x-axis
for(int x = -2; x < 3; x++){
	//Check in z-axis
	for(int z = -2; z < 3; z++){
		//Only get the blocks that are 2 blocks out (For loop -can- be used here instead)
		if(x != -1 || x != 0 || x != 1 || z != -1 || z != 0 || z != 1){
			//Create a new BlockPos based on our offsets
			BlockPos pos = new BlockPos(playerPos.getX()+x, playerPos.getY(), playerPos.getZ()+z);
			//If ANY block is not air, return false
			if(world.getBlockState(pos).getBlock != Blocks.AIR){
				return false;
			}
			//If all blocks are air, return true
			return true;
		}
	}
}
return false;
}

[Choonster]

There are two options:

• Loop from -2 to +2 on both the x and z axes and use

  BlockPos#add(int, int, int)

  to add the x and z offsets to the starting position
  

• Call

  BlockPos#getAllInBoxMutable

  with -2,0,-2 and +2,0,+2 as the arguments and iterate through the returned value

[DasKaktus]

To clarify.

 

I need a function to check if these 3 conditions are met:

Player standing on obsidian.

There are redstone around the player.

Outside of the redstone there should be air blocks.

 

So what do you think of this:

 

public boolean checkRitualOuter(World world, BlockPos playerpos){
boolean isInside = false;
BlockPos pos1 = new BlockPos(playerpos.getX()-2, playerpos.getY(), playerpos.getZ()-2);
BlockPos pos2 = new BlockPos(playerpos.getX()+2, playerpos.getY(), playerpos.getZ()+2);
BlockPos pos3 = new BlockPos(playerpos.getX()-1, playerpos.getY(), playerpos.getZ()-1);
BlockPos pos4 = new BlockPos(playerpos.getX()+1, playerpos.getY(), playerpos.getZ()+1);				

for (BlockPos p1 : BlockPos.getAllInBox(pos1, pos2)) {
	isInside = false;
	for (BlockPos p2 : BlockPos.getAllInBox(pos3, pos4)) {
		if(p1 == p2){
			isInside = true;
		}
	}
	if(!isInside){
		if(world.getBlockState(p1).getBlock() != Blocks.AIR){
			return false;
		}
	}else{
		if(p1 == playerpos && world.getBlockState(playerpos.down(1)).getBlock() != Blocks.OBSIDIAN){
			return false;
		}else{
			if(world.getBlockState(p1).getBlock() != Blocks.REDSTONE_WIRE){
				return false;
			}
		}
	}
}
return true;		
}

[Choonster]

I'd personally recommend this implementation:

 

/**
* Checks that the player is standing on obsidian and surrounded by the following pattern of blocks:
* <p>
* A A A A A
* A R R R A
* A R P R A
* A R R R A
* A A A A A
* <p>
* Where A is air, R is redstone and P is the player.
*
* @param player The player
* @return Is the player surrounded by the correct pattern?
*/
public static boolean isValid(EntityPlayer player) {
final World world = player.getEntityWorld();
final BlockPos playerPos = new BlockPos(player);

// The block under the player must be obsidian
if (!(world.getBlockState(playerPos.down()).getBlock() == Blocks.OBSIDIAN)) return false;

// Iterate from -2,0,-2 to +2,0,+2
for (int x = -2; x <= 2; x++) {
	for (int z = -2; z <= 2; z++) {
		final BlockPos pos = playerPos.add(x, 0, z);
		final IBlockState state = world.getBlockState(pos);

		// If this is the outer layer, the block must be air
		if ((Math.abs(x) == 2 || Math.abs(z) == 2) && state.getBlock() != Blocks.AIR) return false;

		// If this is the inner layer, the block must be redstone
		if ((x != 0 && z != 0) && state.getBlock() != Blocks.REDSTONE_WIRE) return false;
	}
}

// All blocks are correct, the pattern is valid
return true;
}

 

Edit: This code is incorrect. I've linked the correct code below.

[DasKaktus]

I'd personally recommend this implementation:

 

/**
* Checks that the player is standing on obsidian and surrounded by the following pattern of blocks:
* <p>
* A A A A A
* A R R R A
* A R P R A
* A R R R A
* A A A A A
* <p>
* Where A is air, R is redstone and P is the player.
*
* @param player The player
* @return Is the player surrounded by the correct pattern?
*/
public static boolean isValid(EntityPlayer player) {
final World world = player.getEntityWorld();
final BlockPos playerPos = new BlockPos(player);

// The block under the player must be obsidian
if (!(world.getBlockState(playerPos.down()).getBlock() == Blocks.OBSIDIAN)) return false;

// Iterate from -2,0,-2 to +2,0,+2
for (int x = -2; x <= 2; x++) {
	for (int z = -2; z <= 2; z++) {
		final BlockPos pos = playerPos.add(x, 0, z);
		final IBlockState state = world.getBlockState(pos);

		// If this is the outer layer, the block must be air
		if ((Math.abs(x) == 2 || Math.abs(z) == 2) && state.getBlock() != Blocks.AIR) return false;

		// If this is the inner layer, the block must be redstone
		if ((x != 0 && z != 0) && state.getBlock() != Blocks.REDSTONE_WIRE) return false;
	}
}

// All blocks are correct, the pattern is valid
return true;
}

 

Wow, that was clean looking.

[Choonster]

Now that I've actually tested it, my previous code was incorrect. The correct code can be found here.

 

This returns the first invalid position (so it can be displayed to the player) rather than just whether the pattern is valid.