minecraft-src/net/minecraft/world/entity/vehicle/MinecartFurnace.java

package net.minecraft.world.entity.vehicle;

import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.network.syncher.EntityDataAccessor;
import net.minecraft.network.syncher.EntityDataSerializers;
import net.minecraft.network.syncher.SynchedEntityData;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.Items;
import net.minecraft.world.item.crafting.Ingredient;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.FurnaceBlock;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.phys.Vec3;

public class MinecartFurnace extends AbstractMinecart {
	private static final EntityDataAccessor<Boolean> DATA_ID_FUEL = SynchedEntityData.defineId(MinecartFurnace.class, EntityDataSerializers.BOOLEAN);
	private int fuel;
	public double xPush;
	public double zPush;
	/**
	 * The fuel item used to make the minecart move.
	 */
	private static final Ingredient INGREDIENT = Ingredient.of(Items.COAL, Items.CHARCOAL);

	public MinecartFurnace(EntityType<? extends MinecartFurnace> entityType, Level level) {
		super(entityType, level);
	}

	public MinecartFurnace(Level level, double x, double y, double z) {
		super(EntityType.FURNACE_MINECART, level, x, y, z);
	}

	@Override
	public AbstractMinecart.Type getMinecartType() {
		return AbstractMinecart.Type.FURNACE;
	}

	@Override
	protected void defineSynchedData(SynchedEntityData.Builder builder) {
		super.defineSynchedData(builder);
		builder.define(DATA_ID_FUEL, false);
	}

	@Override
	public void tick() {
		super.tick();
		if (!this.level().isClientSide()) {
			if (this.fuel > 0) {
				this.fuel--;
			}

			if (this.fuel <= 0) {
				this.xPush = 0.0;
				this.zPush = 0.0;
			}

			this.setHasFuel(this.fuel > 0);
		}

		if (this.hasFuel() && this.random.nextInt(4) == 0) {
			this.level().addParticle(ParticleTypes.LARGE_SMOKE, this.getX(), this.getY() + 0.8, this.getZ(), 0.0, 0.0, 0.0);
		}
	}

	@Override
	protected double getMaxSpeed() {
		return (this.isInWater() ? 3.0 : 4.0) / 20.0;
	}

	@Override
	protected Item getDropItem() {
		return Items.FURNACE_MINECART;
	}

	@Override
	protected void moveAlongTrack(BlockPos pos, BlockState state) {
		double d = 1.0E-4;
		double e = 0.001;
		super.moveAlongTrack(pos, state);
		Vec3 vec3 = this.getDeltaMovement();
		double f = vec3.horizontalDistanceSqr();
		double g = this.xPush * this.xPush + this.zPush * this.zPush;
		if (g > 1.0E-4 && f > 0.001) {
			double h = Math.sqrt(f);
			double i = Math.sqrt(g);
			this.xPush = vec3.x / h * i;
			this.zPush = vec3.z / h * i;
		}
	}

	@Override
	protected void applyNaturalSlowdown() {
		double d = this.xPush * this.xPush + this.zPush * this.zPush;
		if (d > 1.0E-7) {
			d = Math.sqrt(d);
			this.xPush /= d;
			this.zPush /= d;
			Vec3 vec3 = this.getDeltaMovement().multiply(0.8, 0.0, 0.8).add(this.xPush, 0.0, this.zPush);
			if (this.isInWater()) {
				vec3 = vec3.scale(0.1);
			}

			this.setDeltaMovement(vec3);
		} else {
			this.setDeltaMovement(this.getDeltaMovement().multiply(0.98, 0.0, 0.98));
		}

		super.applyNaturalSlowdown();
	}

	@Override
	public InteractionResult interact(Player player, InteractionHand hand) {
		ItemStack itemStack = player.getItemInHand(hand);
		if (INGREDIENT.test(itemStack) && this.fuel + 3600 <= 32000) {
			itemStack.consume(1, player);
			this.fuel += 3600;
		}

		if (this.fuel > 0) {
			this.xPush = this.getX() - player.getX();
			this.zPush = this.getZ() - player.getZ();
		}

		return InteractionResult.sidedSuccess(this.level().isClientSide);
	}

	@Override
	protected void addAdditionalSaveData(CompoundTag compound) {
		super.addAdditionalSaveData(compound);
		compound.putDouble("PushX", this.xPush);
		compound.putDouble("PushZ", this.zPush);
		compound.putShort("Fuel", (short)this.fuel);
	}

	@Override
	protected void readAdditionalSaveData(CompoundTag compound) {
		super.readAdditionalSaveData(compound);
		this.xPush = compound.getDouble("PushX");
		this.zPush = compound.getDouble("PushZ");
		this.fuel = compound.getShort("Fuel");
	}

	protected boolean hasFuel() {
		return this.entityData.get(DATA_ID_FUEL);
	}

	protected void setHasFuel(boolean hasFuel) {
		this.entityData.set(DATA_ID_FUEL, hasFuel);
	}

	@Override
	public BlockState getDefaultDisplayBlockState() {
		return Blocks.FURNACE.defaultBlockState().setValue(FurnaceBlock.FACING, Direction.NORTH).setValue(FurnaceBlock.LIT, this.hasFuel());
	}
}