EntityFireworkRocket.java

package net.minecraft.entity.item;

import net.minecraft.entity.Entity;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.EnumParticleTypes;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;

public class EntityFireworkRocket extends Entity
{
    /** The age of the firework in ticks. */
    private int fireworkAge;

    /**
     * The lifetime of the firework in ticks. When the age reaches the lifetime the firework explodes.
     */
    private int lifetime;
    private static final String __OBFID = "CL_00001718";

    public EntityFireworkRocket(World worldIn)
    {
        super(worldIn);
        this.setSize(0.25F, 0.25F);
    }

    protected void entityInit()
    {
        this.dataWatcher.addObjectByDataType(8, 5);
    }

    public EntityFireworkRocket(World worldIn, double p_i1763_2_, double p_i1763_4_, double p_i1763_6_, ItemStack p_i1763_8_)
    {
        super(worldIn);
        this.fireworkAge = 0;
        this.setSize(0.25F, 0.25F);
        this.setPosition(p_i1763_2_, p_i1763_4_, p_i1763_6_);
        int var9 = 1;

        if (p_i1763_8_ != null && p_i1763_8_.hasTagCompound())
        {
            this.dataWatcher.updateObject(8, p_i1763_8_);
            NBTTagCompound var10 = p_i1763_8_.getTagCompound();
            NBTTagCompound var11 = var10.getCompoundTag("Fireworks");

            if (var11 != null)
            {
                var9 += var11.getByte("Flight");
            }
        }

        this.motionX = this.rand.nextGaussian() * 0.001D;
        this.motionZ = this.rand.nextGaussian() * 0.001D;
        this.motionY = 0.05D;
        this.lifetime = 10 * var9 + this.rand.nextInt(6) + this.rand.nextInt(7);
    }

    /**
     * Called to update the entity's position/logic.
     */
    public void onUpdate()
    {
        this.lastTickPosX = this.posX;
        this.lastTickPosY = this.posY;
        this.lastTickPosZ = this.posZ;
        super.onUpdate();
        this.motionX *= 1.15D;
        this.motionZ *= 1.15D;
        this.motionY += 0.04D;
        this.moveEntity(this.motionX, this.motionY, this.motionZ);
        float var1 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
        this.rotationYaw = (float)(Math.atan2(this.motionX, this.motionZ) * 180.0D / Math.PI);

        for (this.rotationPitch = (float)(Math.atan2(this.motionY, (double)var1) * 180.0D / Math.PI); this.rotationPitch - this.prevRotationPitch < -180.0F; this.prevRotationPitch -= 360.0F)
        {
            ;
        }

        while (this.rotationPitch - this.prevRotationPitch >= 180.0F)
        {
            this.prevRotationPitch += 360.0F;
        }

        while (this.rotationYaw - this.prevRotationYaw < -180.0F)
        {
            this.prevRotationYaw -= 360.0F;
        }

        while (this.rotationYaw - this.prevRotationYaw >= 180.0F)
        {
            this.prevRotationYaw += 360.0F;
        }

        this.rotationPitch = this.prevRotationPitch + (this.rotationPitch - this.prevRotationPitch) * 0.2F;
        this.rotationYaw = this.prevRotationYaw + (this.rotationYaw - this.prevRotationYaw) * 0.2F;

        if (this.fireworkAge == 0 && !this.isSlient())
        {
            this.worldObj.playSoundAtEntity(this, "fireworks.launch", 3.0F, 1.0F);
        }

        ++this.fireworkAge;

        if (this.worldObj.isRemote && this.fireworkAge % 2 < 2)
        {
            this.worldObj.spawnParticle(EnumParticleTypes.FIREWORKS_SPARK, this.posX, this.posY - 0.3D, this.posZ, this.rand.nextGaussian() * 0.05D, -this.motionY * 0.5D, this.rand.nextGaussian() * 0.05D, new int[0]);
        }

        if (!this.worldObj.isRemote && this.fireworkAge > this.lifetime)
        {
            this.worldObj.setEntityState(this, (byte)17);
            this.setDead();
        }
    }

    /**
     * (abstract) Protected helper method to write subclass entity data to NBT.
     */
    public void writeEntityToNBT(NBTTagCompound tagCompound)
    {
        tagCompound.setInteger("Life", this.fireworkAge);
        tagCompound.setInteger("LifeTime", this.lifetime);
        ItemStack var2 = this.dataWatcher.getWatchableObjectItemStack(8);

        if (var2 != null)
        {
            NBTTagCompound var3 = new NBTTagCompound();
            var2.writeToNBT(var3);
            tagCompound.setTag("FireworksItem", var3);
        }
    }

    /**
     * (abstract) Protected helper method to read subclass entity data from NBT.
     */
    public void readEntityFromNBT(NBTTagCompound tagCompund)
    {
        this.fireworkAge = tagCompund.getInteger("Life");
        this.lifetime = tagCompund.getInteger("LifeTime");
        NBTTagCompound var2 = tagCompund.getCompoundTag("FireworksItem");

        if (var2 != null)
        {
            ItemStack var3 = ItemStack.loadItemStackFromNBT(var2);

            if (var3 != null)
            {
                this.dataWatcher.updateObject(8, var3);
            }
        }
    }

    /**
     * Gets how bright this entity is.
     */
    public float getBrightness(float p_70013_1_)
    {
        return super.getBrightness(p_70013_1_);
    }

    /**
     * If returns false, the item will not inflict any damage against entities.
     */
    public boolean canAttackWithItem()
    {
        return false;
    }
}