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Entity client-server problems?


DFined

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Hello, I hate to go back to the forums for the third time in a month, but I've got a problem which I can seem to explain. I have an entity class (which currently is basically a copy of the entityArrow with some modifications) and when the entity gets created I want to set a field I added. This, however, is proving difficult, because during the onUpdate() method, the entity doesnt behave as expected, and I traced that to the variable "idle" being equal to what I set it as in server, but Equal to 0 on client. Therefore, I expected to have the entity basically do nothing for the amount of ticks specified in idle, then start updating, but It goes straight away, or at least the client part does. I know, that this may be a dumb question, but I cant seem to find much on the subject, as all the tutorials are on tileentity synchronization, so how would I go about fixing this? Here's the class in question:

package com.DFined.Destructicraft.projectiles;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import java.util.List;

import com.DFined.Destructicraft.DestructiCraftMod;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.enchantment.EnchantmentHelper;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.IProjectile;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.init.Items;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.play.server.S2BPacketChangeGameState;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.util.Vec3;
import net.minecraft.world.World;

public class GenericProjectile extends Entity implements IProjectile
{
    private int field_145791_d = -1;
    private int field_145792_e = -1;
    private int field_145789_f = -1;
    private Block field_145790_g;
    private int inData;
    private int idle;
    private boolean inGround;
    /** 1 if the player can pick up the arrow */
    public int canBePickedUp;
    /** Seems to be some sort of timer for animating an arrow. */
    public int arrowShake;
    /** The owner of this arrow. */
    public Entity shootingEntity;
    private int ticksInGround;
    private int ticksInAir;
    private double damage = 2.0D;
    /** The amount of knockback an arrow applies when it hits a mob. */
    private int knockbackStrength;
private boolean exploded = false;
    private static final String __OBFID = "CL_00001715";
    public int lifetime;
    public int age;
    public GenericProjectile(World p_i1753_1_)
    {
        super(p_i1753_1_);
        this.renderDistanceWeight = 10.0D;
        this.setSize(0.5F, 0.5F);
    }

    public GenericProjectile(World theWorld, double theX, double theY, double theZ, float vx, float vy, float vz, int life, int idl)
    {
        super(theWorld);
        idle = idl;
    	lifetime = life;
    	age = 0;
        this.renderDistanceWeight = 10.0D;
        this.setSize(0.5F, 0.5F);
        this.setPosition(theX, theY, theZ);
        this.yOffset = 0.0F;
        motionX = vx;
        motionY = vy;
        motionZ = vz;
    }

    public GenericProjectile(World p_i1755_1_, EntityLivingBase p_i1755_2_, EntityLivingBase p_i1755_3_, float p_i1755_4_, float p_i1755_5_)
    {
        super(p_i1755_1_);
        this.renderDistanceWeight = 10.0D;
        this.shootingEntity = p_i1755_2_;

        if (p_i1755_2_ instanceof EntityPlayer)
        {
            this.canBePickedUp = 1;
        }
        
        this.posY = p_i1755_2_.posY + (double)p_i1755_2_.getEyeHeight() - 0.10000000149011612D;
        double d0 = p_i1755_3_.posX - p_i1755_2_.posX;
        double d1 = p_i1755_3_.boundingBox.minY + (double)(p_i1755_3_.height / 3.0F) - this.posY;
        double d2 = p_i1755_3_.posZ - p_i1755_2_.posZ;
        double d3 = (double)MathHelper.sqrt_double(d0 * d0 + d2 * d2);

        if (d3 >= 1.0E-7D)
        {
            float f2 = (float)(Math.atan2(d2, d0) * 180.0D / Math.PI) - 90.0F;
            float f3 = (float)(-(Math.atan2(d1, d3) * 180.0D / Math.PI));
            double d4 = d0 / d3;
            double d5 = d2 / d3;
            this.setLocationAndAngles(p_i1755_2_.posX + d4, this.posY, p_i1755_2_.posZ + d5, f2, f3);
            this.yOffset = 0.0F;
            float f4 = (float)d3 * 0.2F;
            this.setThrowableHeading(d0, d1 + (double)f4, d2, p_i1755_4_, p_i1755_5_);
        }
    }

    public GenericProjectile(World p_i1756_1_, EntityLivingBase p_i1756_2_, float p_i1756_3_)
    {
        super(p_i1756_1_);
        this.renderDistanceWeight = 10.0D;
        this.shootingEntity = p_i1756_2_;

        if (p_i1756_2_ instanceof EntityPlayer)
        {
            this.canBePickedUp = 1;
        }

        this.setSize(0.5F, 0.5F);
        this.setLocationAndAngles(p_i1756_2_.posX, p_i1756_2_.posY + (double)p_i1756_2_.getEyeHeight(), p_i1756_2_.posZ, p_i1756_2_.rotationYaw, p_i1756_2_.rotationPitch);
        this.posX -= (double)(MathHelper.cos(this.rotationYaw / 180.0F * (float)Math.PI) * 0.16F);
        this.posY -= 0.10000000149011612D;
        this.posZ -= (double)(MathHelper.sin(this.rotationYaw / 180.0F * (float)Math.PI) * 0.16F);
        this.setPosition(this.posX, this.posY, this.posZ);
        this.yOffset = 0.0F;
        this.motionX = (double)(-MathHelper.sin(this.rotationYaw / 180.0F * (float)Math.PI) * MathHelper.cos(this.rotationPitch / 180.0F * (float)Math.PI));
        this.motionZ = (double)(MathHelper.cos(this.rotationYaw / 180.0F * (float)Math.PI) * MathHelper.cos(this.rotationPitch / 180.0F * (float)Math.PI));
        this.motionY = (double)(-MathHelper.sin(this.rotationPitch / 180.0F * (float)Math.PI));
        this.setThrowableHeading(this.motionX, this.motionY, this.motionZ, p_i1756_3_ * 1.5F, 1.0F);
    }

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

    /**
     * Similar to setArrowHeading, it's point the throwable entity to a x, y, z direction.
     */
    

    /**
     * Sets the position and rotation. Only difference from the other one is no bounding on the rotation. Args: posX,
     * posY, posZ, yaw, pitch
     */
    @SideOnly(Side.CLIENT)
    public void setPositionAndRotation2(double p_70056_1_, double p_70056_3_, double p_70056_5_, float p_70056_7_, float p_70056_8_, int p_70056_9_)
    {
        this.setPosition(p_70056_1_, p_70056_3_, p_70056_5_);
        this.setRotation(p_70056_7_, p_70056_8_);
    }

    /**
     * Sets the velocity to the args. Args: x, y, z
     */
    @SideOnly(Side.CLIENT)
    public void setVelocity(double p_70016_1_, double p_70016_3_, double p_70016_5_)
    {
        this.motionX = p_70016_1_;
        this.motionY = p_70016_3_;
        this.motionZ = p_70016_5_;

        if (this.prevRotationPitch == 0.0F && this.prevRotationYaw == 0.0F)
        {
            float f = MathHelper.sqrt_double(p_70016_1_ * p_70016_1_ + p_70016_5_ * p_70016_5_);
            this.prevRotationYaw = this.rotationYaw = (float)(Math.atan2(p_70016_1_, p_70016_5_) * 180.0D / Math.PI);
            this.prevRotationPitch = this.rotationPitch = (float)(Math.atan2(p_70016_3_, (double)f) * 180.0D / Math.PI);
            this.prevRotationPitch = this.rotationPitch;
            this.prevRotationYaw = this.rotationYaw;
            this.setLocationAndAngles(this.posX, this.posY, this.posZ, this.rotationYaw, this.rotationPitch);
            this.ticksInGround = 0;
        }
    }

    /**
     * Called to update the entity's position/logic.
     */
    public void onUpdate()
    {        
        if(idle>0){
        	idle--;            // <--THE PART OF CODE IN QUESTION
        }else{
        	super.onUpdate();
        	Entity entity = null;
        	List list = this.worldObj.getEntitiesWithinAABBExcludingEntity(this, this.boundingBox.addCoord(this.motionX, this.motionY, this.motionZ).expand(1.0D, 1.0D, 1.0D));
            double d0 = 0.0D;
            int i;
            this.posX += this.motionX;
            this.posY += this.motionY;
            this.posZ += this.motionZ;
           
            this.rotationYaw = (float)(Math.atan2(this.motionX, this.motionZ) * 180.0D / Math.PI);

            
            this.rotationPitch = this.prevRotationPitch + (this.rotationPitch - this.prevRotationPitch) * 0.2F;
            this.rotationYaw = this.prevRotationYaw + (this.rotationYaw - this.prevRotationYaw) * 0.2F;
            float f3 = 0.99F;

            
            this.motionX *= 1;
            this.motionY *= 1;
            this.motionZ *= 1;
            this.motionY -= 0.2;
            this.setPosition(this.posX, this.posY, this.posZ);
            if(age>lifetime&&!this.exploded&&this.worldObj.isRemote){
            	this.explode();
            }
        }
            
        
    }

    /**
     * (abstract) Protected helper method to write subclass entity data to NBT.
     */
    public void writeEntityToNBT(NBTTagCompound NBT)
    {
        NBT.setShort("xTile", (short)this.field_145791_d);
        NBT.setShort("yTile", (short)this.field_145792_e);
        NBT.setShort("zTile", (short)this.field_145789_f);
        NBT.setInteger("life", 20);
    }

    /**
     * (abstract) Protected helper method to read subclass entity data from NBT.
     */
    public void readEntityFromNBT(NBTTagCompound p_70037_1_)
    {
    	
        this.field_145791_d = p_70037_1_.getShort("xTile");
        this.field_145792_e = p_70037_1_.getShort("yTile");
        this.field_145789_f = p_70037_1_.getShort("zTile");
    }

    /**
     * Called by a player entity when they collide with an entity
     */
    public void onCollideWithPlayer(EntityPlayer p_70100_1_)
    {
        if (!this.worldObj.isRemote && this.inGround && this.arrowShake <= 0)
        {
            boolean flag = this.canBePickedUp == 1 || this.canBePickedUp == 2 && p_70100_1_.capabilities.isCreativeMode;

            if (this.canBePickedUp == 1 && !p_70100_1_.inventory.addItemStackToInventory(new ItemStack(Items.arrow, 1)))
            {
                flag = false;
            }

            if (flag)
            {
                this.playSound("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
                p_70100_1_.onItemPickup(this, 1);
                this.setDead();
            }
        }
    }

    /**
     * returns if this entity triggers Block.onEntityWalking on the blocks they walk on. used for spiders and wolves to
     * prevent them from trampling crops
     */
    protected boolean canTriggerWalking()
    {
        return false;
    }

    @SideOnly(Side.CLIENT)
    public float getShadowSize()
    {
        return 0.0F;
    }

    public void setDamage(double p_70239_1_)
    {
        this.damage = p_70239_1_;
    }

    public double getDamage()
    {
        return this.damage;
    }

    /**
     * Sets the amount of knockback the arrow applies when it hits a mob.
     */
    public void setKnockbackStrength(int p_70240_1_)
    {
        this.knockbackStrength = p_70240_1_;
    }

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



    
    private void explode() {
	exploded = true;
	DestructiCraftMod.proxy.spawnParticles(this.worldObj,posX,posY,posZ, 0, 0, 0, 1, 1, 0, 0, 0, 0, 600, 3, 0.2F, false);
	for(int i = 0; i < 150; i ++){
		float dx = (float) Math.random()-0.5F;
		float dy = (float) Math.random()-0.5F;
		float dz = (float) Math.random()-0.5F;
		while((Math.sqrt(dz*dz+dy*dy+dx*dx)<0.45)||(Math.sqrt(dz*dz+dy*dy+dx*dx)>0.5)){
			dx = (float) Math.random()-0.5F;
			dy = (float) Math.random()-0.5F;
			dz = (float) Math.random()-0.5F;
		}
		int r = 100;
        	DestructiCraftMod.proxy.spawnParticles(this.worldObj,posX,posY,posZ, (float)(dx*Math.random()*30), (float)(dy*Math.random()*30), (float)(dz*Math.random()*30), (float)(Math.random()*0.5+0.5), (float)(Math.random()*0.5), (float)(Math.random()*0.1), (float)(1), (float)(Math.random()*2), (float)(0), 7, 65, 1F, true);
        }

}

@Override
public void setThrowableHeading(double p_70186_1_, double p_70186_3_, double p_70186_5_, float p_70186_7_,
		float p_70186_8_) {

}
}

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If the field is set once during entity creating, use IEntityAdditionalSpawnData to tack the initial value to the entity's spawn packet (which is sent to the cilent).

 

If the field is going to change after the entity has spawned and needs to be kept in sync, use DataWatcher in your Entity class.

 

Also, you should rename your variables to something meaningful instead of 'field_145791_d'.

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Thanks for such a swift answer! Gonna try this now.

As for the variable names - as I say, this is currently a copy of the arrow class, and I still haven't got to properly formatting the stuff I need and deleting the rest.

And thanks again!

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