EntityMinecartFurnace.java

package net.minecraft.entity.item;

import net.minecraft.block.Block;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.event.entity.minecart.MinecartInteractEvent;

public class EntityMinecartFurnace extends EntityMinecart
{
    private int fuel = 0;
    public double pushX;
    public double pushZ;

    public EntityMinecartFurnace(World par1World)
    {
        super(par1World);
    }

    public EntityMinecartFurnace(World par1World, double par2, double par4, double par6)
    {
        super(par1World, par2, par4, par6);
    }

    public int getMinecartType()
    {
        return 2;
    }

    protected void entityInit()
    {
        super.entityInit();
        this.dataWatcher.addObject(16, new Byte((byte)0));
    }

    /**
     * Called to update the entity's position/logic.
     */
    public void onUpdate()
    {
        super.onUpdate();

        if (this.fuel > 0)
        {
            --this.fuel;
        }

        if (this.fuel <= 0)
        {
            this.pushX = this.pushZ = 0.0D;
        }

        this.setMinecartPowered(this.fuel > 0);

        if (this.isMinecartPowered() && this.rand.nextInt(4) == 0)
        {
            this.worldObj.spawnParticle("largesmoke", this.posX, this.posY + 0.8D, this.posZ, 0.0D, 0.0D, 0.0D);
        }
    }

    public void killMinecart(DamageSource par1DamageSource)
    {
        super.killMinecart(par1DamageSource);

        if (!par1DamageSource.isExplosion())
        {
            this.entityDropItem(new ItemStack(Block.furnaceIdle, 1), 0.0F);
        }
    }

    protected void updateOnTrack(int par1, int par2, int par3, double par4, double par6, int par8, int par9)
    {
        super.updateOnTrack(par1, par2, par3, par4, par6, par8, par9);
        double d2 = this.pushX * this.pushX + this.pushZ * this.pushZ;

        if (d2 > 1.0E-4D && this.motionX * this.motionX + this.motionZ * this.motionZ > 0.001D)
        {
            d2 = (double)MathHelper.sqrt_double(d2);
            this.pushX /= d2;
            this.pushZ /= d2;

            if (this.pushX * this.motionX + this.pushZ * this.motionZ < 0.0D)
            {
                this.pushX = 0.0D;
                this.pushZ = 0.0D;
            }
            else
            {
                this.pushX = this.motionX;
                this.pushZ = this.motionZ;
            }
        }
    }

    protected void applyDrag()
    {
        double d0 = this.pushX * this.pushX + this.pushZ * this.pushZ;

        if (d0 > 1.0E-4D)
        {
            d0 = (double)MathHelper.sqrt_double(d0);
            this.pushX /= d0;
            this.pushZ /= d0;
            double d1 = 0.05D;
            this.motionX *= 0.800000011920929D;
            this.motionY *= 0.0D;
            this.motionZ *= 0.800000011920929D;
            this.motionX += this.pushX * d1;
            this.motionZ += this.pushZ * d1;
        }
        else
        {
            this.motionX *= 0.9800000190734863D;
            this.motionY *= 0.0D;
            this.motionZ *= 0.9800000190734863D;
        }

        super.applyDrag();
    }

    /**
     * Called when a player interacts with a mob. e.g. gets milk from a cow, gets into the saddle on a pig.
     */
    public boolean interact(EntityPlayer par1EntityPlayer)
    {
        if(MinecraftForge.EVENT_BUS.post(new MinecartInteractEvent(this, par1EntityPlayer))) 
        {
            return true;
        }
        ItemStack itemstack = par1EntityPlayer.inventory.getCurrentItem();

        if (itemstack != null && itemstack.itemID == Item.coal.itemID)
        {
            if (--itemstack.stackSize == 0)
            {
                par1EntityPlayer.inventory.setInventorySlotContents(par1EntityPlayer.inventory.currentItem, (ItemStack)null);
            }

            this.fuel += 3600;
        }

        this.pushX = this.posX - par1EntityPlayer.posX;
        this.pushZ = this.posZ - par1EntityPlayer.posZ;
        return true;
    }

    /**
     * (abstract) Protected helper method to write subclass entity data to NBT.
     */
    protected void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.writeEntityToNBT(par1NBTTagCompound);
        par1NBTTagCompound.setDouble("PushX", this.pushX);
        par1NBTTagCompound.setDouble("PushZ", this.pushZ);
        par1NBTTagCompound.setShort("Fuel", (short)this.fuel);
    }

    /**
     * (abstract) Protected helper method to read subclass entity data from NBT.
     */
    protected void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.readEntityFromNBT(par1NBTTagCompound);
        this.pushX = par1NBTTagCompound.getDouble("PushX");
        this.pushZ = par1NBTTagCompound.getDouble("PushZ");
        this.fuel = par1NBTTagCompound.getShort("Fuel");
    }

    protected boolean isMinecartPowered()
    {
        return (this.dataWatcher.getWatchableObjectByte(16) & 1) != 0;
    }

    protected void setMinecartPowered(boolean par1)
    {
        if (par1)
        {
            this.dataWatcher.updateObject(16, Byte.valueOf((byte)(this.dataWatcher.getWatchableObjectByte(16) | 1)));
        }
        else
        {
            this.dataWatcher.updateObject(16, Byte.valueOf((byte)(this.dataWatcher.getWatchableObjectByte(16) & -2)));
        }
    }

    public Block getDefaultDisplayTile()
    {
        return Block.furnaceBurning;
    }

    public int getDefaultDisplayTileData()
    {
        return 2;
    }
}