Java tutorial
/* * Forge Mod Loader * Copyright (c) 2012-2013 cpw. * All rights reserved. This program and the accompanying materials * are made available under the terms of the GNU Lesser Public License v2.1 * which accompanies this distribution, and is available at * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html * * Contributors: * cpw - implementation */ package cpw.mods.fml.common.network; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.util.List; import java.util.logging.Level; import net.minecraft.entity.*; import net.minecraft.network.INetworkManager; import net.minecraft.network.packet.NetHandler; import net.minecraft.util.MathHelper; import com.google.common.io.ByteArrayDataInput; import com.google.common.io.ByteArrayDataOutput; import com.google.common.io.ByteStreams; import cpw.mods.fml.common.FMLCommonHandler; import cpw.mods.fml.common.FMLLog; import cpw.mods.fml.common.ModContainer; import cpw.mods.fml.common.registry.EntityRegistry; import cpw.mods.fml.common.registry.EntityRegistry.EntityRegistration; import cpw.mods.fml.common.registry.IEntityAdditionalSpawnData; import cpw.mods.fml.common.registry.IThrowableEntity; public class EntitySpawnPacket extends FMLPacket { public int networkId; public int modEntityId; public int entityId; public double scaledX; public double scaledY; public double scaledZ; public float scaledYaw; public float scaledPitch; public float scaledHeadYaw; public List metadata; public int throwerId; public double speedScaledX; public double speedScaledY; public double speedScaledZ; public ByteArrayDataInput dataStream; public int rawX; public int rawY; public int rawZ; public EntitySpawnPacket() { super(Type.ENTITYSPAWN); } @Override public byte[] generatePacket(Object... data) { EntityRegistration er = (EntityRegistration) data[0]; Entity ent = (Entity) data[1]; NetworkModHandler handler = (NetworkModHandler) data[2]; ByteArrayDataOutput dat = ByteStreams.newDataOutput(); dat.writeInt(handler.getNetworkId()); dat.writeInt(er.getModEntityId()); // entity id dat.writeInt(ent.field_70157_k); // entity pos x,y,z dat.writeInt(MathHelper.func_76128_c(ent.field_70165_t * 32D)); dat.writeInt(MathHelper.func_76128_c(ent.field_70163_u * 32D)); dat.writeInt(MathHelper.func_76128_c(ent.field_70161_v * 32D)); // yaw, pitch dat.writeByte((byte) (ent.field_70177_z * 256.0F / 360.0F)); dat.writeByte((byte) (ent.field_70125_A * 256.0F / 360.0F)); // head yaw if (ent instanceof EntityLiving) { dat.writeByte((byte) (((EntityLiving) ent).field_70759_as * 256.0F / 360.0F)); } else { dat.writeByte(0); } ByteArrayOutputStream bos = new ByteArrayOutputStream(); DataOutputStream dos = new DataOutputStream(bos); try { ent.func_70096_w().func_75689_a(dos); } catch (IOException e) { // unpossible } dat.write(bos.toByteArray()); if (ent instanceof IThrowableEntity) { Entity owner = ((IThrowableEntity) ent).getThrower(); dat.writeInt(owner == null ? ent.field_70157_k : owner.field_70157_k); double maxVel = 3.9D; double mX = ent.field_70159_w; double mY = ent.field_70181_x; double mZ = ent.field_70179_y; if (mX < -maxVel) mX = -maxVel; if (mY < -maxVel) mY = -maxVel; if (mZ < -maxVel) mZ = -maxVel; if (mX > maxVel) mX = maxVel; if (mY > maxVel) mY = maxVel; if (mZ > maxVel) mZ = maxVel; dat.writeInt((int) (mX * 8000D)); dat.writeInt((int) (mY * 8000D)); dat.writeInt((int) (mZ * 8000D)); } else { dat.writeInt(0); } if (ent instanceof IEntityAdditionalSpawnData) { ((IEntityAdditionalSpawnData) ent).writeSpawnData(dat); } return dat.toByteArray(); } @Override public FMLPacket consumePacket(byte[] data) { ByteArrayDataInput dat = ByteStreams.newDataInput(data); networkId = dat.readInt(); modEntityId = dat.readInt(); entityId = dat.readInt(); rawX = dat.readInt(); rawY = dat.readInt(); rawZ = dat.readInt(); scaledX = rawX / 32D; scaledY = rawY / 32D; scaledZ = rawZ / 32D; scaledYaw = dat.readByte() * 360F / 256F; scaledPitch = dat.readByte() * 360F / 256F; scaledHeadYaw = dat.readByte() * 360F / 256F; ByteArrayInputStream bis = new ByteArrayInputStream(data, 27, data.length - 27); DataInputStream dis = new DataInputStream(bis); try { metadata = DataWatcher.func_75686_a(dis); } catch (IOException e) { // Nope } dat.skipBytes(data.length - bis.available() - 27); throwerId = dat.readInt(); if (throwerId != 0) { speedScaledX = dat.readInt() / 8000D; speedScaledY = dat.readInt() / 8000D; speedScaledZ = dat.readInt() / 8000D; } this.dataStream = dat; return this; } @Override public void execute(INetworkManager network, FMLNetworkHandler handler, NetHandler netHandler, String userName) { NetworkModHandler nmh = handler.findNetworkModHandler(networkId); ModContainer mc = nmh.getContainer(); EntityRegistration registration = EntityRegistry.instance().lookupModSpawn(mc, modEntityId); Class<? extends Entity> cls = registration.getEntityClass(); if (cls == null) { FMLLog.log(Level.WARNING, "Missing mod entity information for %s : %d", mc.getModId(), modEntityId); return; } Entity entity = FMLCommonHandler.instance().spawnEntityIntoClientWorld(registration, this); } }