GrindHelper.java

package com.mrcrayfish.skateboarding.util;

import com.mrcrayfish.skateboarding.block.attributes.Grindable;
import com.mrcrayfish.skateboarding.entity.EntitySkateboard;
import com.mrcrayfish.skateboarding.init.SkateboardingBlocks;

import net.minecraft.block.Block;
import net.minecraft.block.state.IBlockState;
import net.minecraft.init.Blocks;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

public class GrindHelper
{
	public static boolean canGrind(World world, double posX, double posY, double posZ)
	{
		BlockPos pos = new BlockPos(posX, posY, posZ);
		IBlockState state = world.getBlockState(pos);
		Block block = state.getBlock();
		if(block instanceof Grindable)
		{
			return ((Grindable) block).canGrind(world, state, pos, posX - (int) posX, posY - pos.getY(), posZ - (int) posZ);
		}
		
		pos = new BlockPos(posX, posY - 0.5, posZ);
		state = world.getBlockState(pos);
		block = state.getBlock();
		if(block instanceof Grindable)
		{
			return ((Grindable) block).canGrind(world, state, pos, posX - (int) posX, posY - pos.getY(), posZ - (int) posZ);
		}
		
		pos = new BlockPos(posX, posY - 1.0, posZ);
		state = world.getBlockState(pos);
		block = state.getBlock();
		if(block == Blocks.IRON_BARS)
		{
			return true;
		}
		if(block instanceof Grindable)
		{
			return ((Grindable) block).canGrind(world, state, pos, posX - (int) posX, posY - pos.getY(), posZ - (int) posZ);
		}
		
		pos = new BlockPos(posX, posY - 1.5, posZ);
		state = world.getBlockState(pos);
		block = state.getBlock();
		if(block instanceof Grindable)
		{
			return ((Grindable) block).canGrind(world, state, pos, posX - (int) posX, posY - pos.getY(), posZ - (int) posZ);
		}
		
		pos = new BlockPos(posX, posY - 2.0, posZ);
		state = world.getBlockState(pos);
		block = state.getBlock();
		if(block instanceof Grindable)
		{
			return ((Grindable) block).canGrind(world, state, pos, posX - (int) posX, posY - pos.getY(), posZ - (int) posZ);
		}
		
		pos = new BlockPos(posX, posY - 2.5, posZ);
		state = world.getBlockState(pos);
		block = state.getBlock();
		if(block instanceof Grindable)
		{
			return ((Grindable) block).canGrind(world, state, pos, posX - (int) posX, posY - pos.getY(), posZ - (int) posZ);
		}
		
		pos = new BlockPos(posX, posY - 0.75, posZ);
		block = world.getBlockState(pos).getBlock();
		return block == Blocks.IRON_BARS || block == SkateboardingBlocks.flat_bar;
	}

	public static double[] setOffset(EntitySkateboard skateboard, double x, double y, double z)
	{
		EnumFacing facing = EnumFacing.fromAngle(skateboard.angleOnJump);
		switch (facing)
		{
		case EAST:
			return new double[]{z,y,x}; 
		case SOUTH:
			return new double[]{-x,y,-z}; 
		case WEST:
			return new double[]{-z,y,-x};
		default:
			return new double[]{x,y,z};
		}
	}
}