[1.7.2] [Beginner] Get a chunk's borders

[otter]

Hey,

beginner here, a short question concerning 1.7.2 I couldn't figure out myself by reading the code or Google.

 

How do I get the current chunk's borders?

 

This is my current approach:

	@Override
public boolean onBlockActivated(World p_149727_1_, int p_149727_2_, int p_149727_3_, int p_149727_4_, EntityPlayer p_149727_5_, int p_149727_6_, float p_149727_7_, float p_149727_8_, float p_149727_9_)
   {
if(p_149727_1_.isRemote) return false;

	int x = p_149727_2_;
	int y = p_149727_3_;
	int z = p_149727_4_;

	Chunk currentChunk = p_149727_1_.getChunkFromChunkCoords(x,y);
	ChunkCoordIntPair CCIP = currentChunk.getChunkCoordIntPair();
	int x_border = CCIP.chunkXPos;
	int z_border = CCIP.chunkZPos;
	int y_border = currentChunk.heightMap[x_border << 4 | z_border]; // TODO: crash; taken from canBlockSeeTheSky
//... 

I did some testing and these coordinates definitely aren't the chunks borders but rather the current block's coords. Also, my y_border-method crashes the game via a ArrayIndexOutOfBoundsException (haven't looked into this too much, as soon as I see bit-shifting my mind crashes as well...).

 

Thanks in advance.

[muddyfish]

I would do some modular arithmetic to find the x and z boundarys...

int x_lower = x%16
int z_lower = z%16
int x_upper = x_lower+16
int z_upper = z_lower+16

[otter]

Thank you. This did the job:

 

		int x_mod = x % 16;
	int x1_border = x;
	int c = 0;
	while (x_mod != 0 && c <= 16) {
		x1_border++;
		c++;
		x_mod = (x1_border) % 16;
		if (debugPlacer)
			p_149727_1_.setBlock(x1_border, y, z, Blocks.redstone_torch);
	}