Code/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java

package net.minecraft.network.protocol.game;

import java.util.UUID;
import net.minecraft.core.BlockPos;
import net.minecraft.core.registries.Registries;
import net.minecraft.network.RegistryFriendlyByteBuf;
import net.minecraft.network.codec.ByteBufCodecs;
import net.minecraft.network.codec.StreamCodec;
import net.minecraft.network.protocol.Packet;
import net.minecraft.network.protocol.PacketType;
import net.minecraft.server.level.ServerEntity;
import net.minecraft.util.Mth;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.phys.Vec3;

public class ClientboundAddEntityPacket implements Packet<ClientGamePacketListener> {
    public static final StreamCodec<RegistryFriendlyByteBuf, ClientboundAddEntityPacket> STREAM_CODEC = Packet.codec(
        ClientboundAddEntityPacket::write, ClientboundAddEntityPacket::new
    );
    private static final double MAGICAL_QUANTIZATION = 8000.0;
    private static final double LIMIT = 3.9;
    private final int id;
    private final UUID uuid;
    private final EntityType<?> type;
    private final double x;
    private final double y;
    private final double z;
    private final int xa;
    private final int ya;
    private final int za;
    private final byte xRot;
    private final byte yRot;
    private final byte yHeadRot;
    private final int data;

    public ClientboundAddEntityPacket(Entity p_131481_, ServerEntity p_343528_) {
        this(p_131481_, p_343528_, 0);
    }

    public ClientboundAddEntityPacket(Entity p_131483_, ServerEntity p_342757_, int p_131484_) {
        this(
            p_131483_.getId(),
            p_131483_.getUUID(),
            p_342757_.getPositionBase().x(),
            p_342757_.getPositionBase().y(),
            p_342757_.getPositionBase().z(),
            p_342757_.getLastSentXRot(),
            p_342757_.getLastSentYRot(),
            p_131483_.getType(),
            p_131484_,
            p_342757_.getLastSentMovement(),
            p_342757_.getLastSentYHeadRot()
        );
    }

    public ClientboundAddEntityPacket(Entity p_237558_, int p_237559_, BlockPos p_237560_) {
        this(
            p_237558_.getId(),
            p_237558_.getUUID(),
            p_237560_.getX(),
            p_237560_.getY(),
            p_237560_.getZ(),
            p_237558_.getXRot(),
            p_237558_.getYRot(),
            p_237558_.getType(),
            p_237559_,
            p_237558_.getDeltaMovement(),
            p_237558_.getYHeadRot()
        );
    }

    public ClientboundAddEntityPacket(
        int p_237546_,
        UUID p_237547_,
        double p_237548_,
        double p_237549_,
        double p_237550_,
        float p_237551_,
        float p_237552_,
        EntityType<?> p_237553_,
        int p_237554_,
        Vec3 p_237555_,
        double p_237556_
    ) {
        this.id = p_237546_;
        this.uuid = p_237547_;
        this.x = p_237548_;
        this.y = p_237549_;
        this.z = p_237550_;
        this.xRot = Mth.packDegrees(p_237551_);
        this.yRot = Mth.packDegrees(p_237552_);
        this.yHeadRot = Mth.packDegrees((float)p_237556_);
        this.type = p_237553_;
        this.data = p_237554_;
        this.xa = (int)(Mth.clamp(p_237555_.x, -3.9, 3.9) * 8000.0);
        this.ya = (int)(Mth.clamp(p_237555_.y, -3.9, 3.9) * 8000.0);
        this.za = (int)(Mth.clamp(p_237555_.z, -3.9, 3.9) * 8000.0);
    }

    private ClientboundAddEntityPacket(RegistryFriendlyByteBuf p_327810_) {
        this.id = p_327810_.readVarInt();
        this.uuid = p_327810_.readUUID();
        this.type = ByteBufCodecs.registry(Registries.ENTITY_TYPE).decode(p_327810_);
        this.x = p_327810_.readDouble();
        this.y = p_327810_.readDouble();
        this.z = p_327810_.readDouble();
        this.xRot = p_327810_.readByte();
        this.yRot = p_327810_.readByte();
        this.yHeadRot = p_327810_.readByte();
        this.data = p_327810_.readVarInt();
        this.xa = p_327810_.readShort();
        this.ya = p_327810_.readShort();
        this.za = p_327810_.readShort();
    }

    private void write(RegistryFriendlyByteBuf p_332393_) {
        p_332393_.writeVarInt(this.id);
        p_332393_.writeUUID(this.uuid);
        ByteBufCodecs.registry(Registries.ENTITY_TYPE).encode(p_332393_, this.type);
        p_332393_.writeDouble(this.x);
        p_332393_.writeDouble(this.y);
        p_332393_.writeDouble(this.z);
        p_332393_.writeByte(this.xRot);
        p_332393_.writeByte(this.yRot);
        p_332393_.writeByte(this.yHeadRot);
        p_332393_.writeVarInt(this.data);
        p_332393_.writeShort(this.xa);
        p_332393_.writeShort(this.ya);
        p_332393_.writeShort(this.za);
    }

    @Override
    public PacketType<ClientboundAddEntityPacket> type() {
        return GamePacketTypes.CLIENTBOUND_ADD_ENTITY;
    }

    public void handle(ClientGamePacketListener p_131495_) {
        p_131495_.handleAddEntity(this);
    }

    public int getId() {
        return this.id;
    }

    public UUID getUUID() {
        return this.uuid;
    }

    public EntityType<?> getType() {
        return this.type;
    }

    public double getX() {
        return this.x;
    }

    public double getY() {
        return this.y;
    }

    public double getZ() {
        return this.z;
    }

    public double getXa() {
        return this.xa / 8000.0;
    }

    public double getYa() {
        return this.ya / 8000.0;
    }

    public double getZa() {
        return this.za / 8000.0;
    }

    public float getXRot() {
        return Mth.unpackDegrees(this.xRot);
    }

    public float getYRot() {
        return Mth.unpackDegrees(this.yRot);
    }

    public float getYHeadRot() {
        return Mth.unpackDegrees(this.yHeadRot);
    }

    public int getData() {
        return this.data;
    }
}