Gravity effected and distance-support Stone Replacement

BlockUnstableStone

package com.draco18s.hazards.block;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import com.draco18s.hardlib.HashUtils;
import com.draco18s.hazards.StoneRegistry;
import com.draco18s.hazards.block.helper.UnstableStoneHelper;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.client.renderer.texture.TextureAtlasSprite;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.init.Blocks;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.IIcon;
import net.minecraft.util.StatCollector;
import net.minecraft.util.Vec3;
import net.minecraft.world.Explosion;
import net.minecraft.world.IBlockAccess;
import net.minecraft.world.World;

public class BlockUnstableStone extends Block{

	private IIcon[] icons;
	private IIcon[] ticons;
	private boolean iconsSet = false;

	public BlockUnstableStone(String origName, String textureName) {
		super(Material.rock);
		setTickRandomly(true);
		setHardness(2.0F);
		setHarvestLevel("pickaxe", 0);
		setCreativeTab(CreativeTabs.tabBlock);
		setBlockName(origName);
		setStepSound(soundTypeStone);
		setBlockTextureName(textureName);
	}
	
	@Override
	public void registerBlockIcons(IIconRegister iconRegister) {
		TextureAtlasSprite sprite;
		this.icons = new IIcon[9];
		this.ticons = new IIcon[7];
		
		icons[1] = icons[0] = ((TextureAtlasSprite) iconRegister.registerIcon(this.textureName)); //base, original texture

		for(int o = 0; o < 7; o++) {
			ticons[o] = iconRegister.registerIcon("hazards:stone_overlay_"+o); //the common overlay texture 
			icons[o+2] = iconRegister.registerIcon(this.textureName+"_"+"damaged_"+o); //uniquely named, non-existent texture
		}
	}
	
	@Override
	public int tickRate(World p_149738_1_) {
        return 50;
    }
	
	@SideOnly(Side.CLIENT)
	@Override
    public void getSubBlocks(Item unknown, CreativeTabs tab, List subItems)
    {
		for (int ix = 0; ix < 4; ix++) {
			subItems.add(new ItemStack(this, 1, ix));
		}
    }
	
	@Override
	public void updateTick(World world, int x, int y, int z, Random par5Random) {
		int meta = world.getBlockMetadata(x, y, z);
		switch(meta) {
			case 0:
				UnstableStoneHelper.updateUnstable(world, x, y, z, par5Random, this, meta);
				break;
			case 1:
				UnstableStoneHelper.updateFractured(world, x, y, z, par5Random, this, meta);
				break;
			case 2:
				UnstableStoneHelper.updateBroken(world, x, y, z, par5Random, this, meta);
				break;
			case 3:
				UnstableStoneHelper.updateCobble(world, x, y, z, par5Random, this, meta);
				break;
		}
	}
	
	@SideOnly(Side.CLIENT)
	@Override
    public IIcon getIcon(IBlockAccess world, int xx, int yy, int zz, int side) {
		int meta = world.getBlockMetadata(xx, yy, zz);
		if(meta == 1 && side > 1) {
			int ch = (xx - yy + zz) % 16;
			switch(Math.abs(ch)) {
				case 0:
				case 11:
					return this.icons[5];
				case 1:
				case 10:
					return this.icons[6];
				case 2:
				case 9:
					return this.icons[7];
				case 3:
				case 8:
					return this.icons[8];
			}
			return this.icons[4];
		}
        return this.getIcon(side, meta);
    }
	
	@SideOnly(Side.CLIENT)
	@Override
    public IIcon getIcon(int side, int metadata) {
		if(!iconsSet) {
			TextureAtlasSprite temp;
			int[][] overlay;
			int[][] base;
			int[][] newIconData;
			int sr, sg, sb;
			float sa;
			int dr, dg, db;
			
			for(int o = 0; o < 7; o++) {
				overlay = StoneRegistry.getIconOverlay(o);
				if(overlay == null) {
					temp = (TextureAtlasSprite)ticons[o];
					overlay = temp.getFrameTextureData(0);
					StoneRegistry.setIconOverlay(overlay.clone());
				}
				base = ((TextureAtlasSprite)icons[0]).getFrameTextureData(0);
				//combine {
					newIconData = base.clone();
					for(int x=0; x < newIconData.length; x++) {
						for(int y=0; y < newIconData[x].length; y++) {
							sa = (overlay[x][y] >> 24 & 255)/255f;
							sr = overlay[x][y] >> 16 & 255;
			                sg = overlay[x][y] >> 8 & 255;
			                sb = overlay[x][y] >> 0 & 255;
							//da = 0xFF;
							dr = newIconData[x][y] >> 16 & 255;
			                dg = newIconData[x][y] >> 8 & 255;
			                db = newIconData[x][y] >> 0 & 255;
			                
			                dr = (int) (sr*sa + dr*(1-sa));
			                dg = (int) (sg*sa + dg*(1-sa));
			                db = (int) (sb*sa + db*(1-sa));
			                
							newIconData[x][y] = (dr<<16) + (dg<<8) + (db);
						}
					}
				//}
				//icons[o+2] = iconRegister.registerIcon("damaged_"+o+"_"+this.textureName);
				List data = new ArrayList();
				data.add(newIconData);
				((TextureAtlasSprite)icons[o+2]).setFramesTextureData(data);
			}
		}
		if(metadata > 3) {
			metadata = 3;
		}
        return this.icons[metadata];
    }
	
	@Override
	public Item getItemDropped(int par1, Random par2Random, int par3) {
    	return Item.getItemFromBlock(Blocks.cobblestone);
    }

	@Override
	public void onBlockAdded(World world, int x, int y, int z) {
		this.updateTick(world, x, y, z, world.rand);
	}

	@Override
	public void onNeighborChange(IBlockAccess world, int x, int y, int z, int tx, int ty, int tz) {
		this.updateTick((World)world, x, y, z, ((World)world).rand);
	}
	
	@Override
	public void onNeighborBlockChange(World world, int x, int y, int z, Block neighbor) {
		world.scheduleBlockUpdate(x, y, z, this, 6 + new Random().nextInt(6));
	}
}