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#include "stdafx.h"
#include <iostream>
#include "InputOutputStream.h"
#include "net.minecraft.world.entity.h"
#include "PacketListener.h"
#include "SetEntityMotionPacket.h"
void SetEntityMotionPacket::_init(int id, double xd, double yd, double zd)
{
this->id = id;
double m = 3.9;
if (xd < -m) xd = -m;
if (yd < -m) yd = -m;
if (zd < -m) zd = -m;
if (xd > m) xd = m;
if (yd > m) yd = m;
if (zd > m) zd = m;
xa = static_cast<int>(xd * 8000.0);
ya = static_cast<int>(yd * 8000.0);
za = static_cast<int>(zd * 8000.0);
// 4J - if we could transmit this as bytes (in 1/16 accuracy) then flag to do so
if( ( xa >= (-128 * 16 ) ) && ( ya >= (-128 * 16 ) ) && ( za >= (-128 * 16 ) ) &&
( xa < (128 * 16 ) ) && ( ya < (128 * 16 ) ) && ( za < (128 * 16 ) ) )
{
useBytes = true;
}
else
{
useBytes = false;
}
}
SetEntityMotionPacket::SetEntityMotionPacket()
{
_init(0, 0.0f, 0.0f, 0.0f);
}
SetEntityMotionPacket::SetEntityMotionPacket(shared_ptr<Entity> e)
{
_init(e->entityId, e->xd, e->yd, e->zd);
}
SetEntityMotionPacket::SetEntityMotionPacket(int id, double xd, double yd, double zd)
{
_init(id, xd, yd, zd);
}
void SetEntityMotionPacket::read(DataInputStream *dis) //throws IOException
{
short idAndFlag = dis->readShort();
id = idAndFlag & 0x07ff;
if( idAndFlag & 0x0800 )
{
xa = static_cast<int>(dis->readByte());
ya = static_cast<int>(dis->readByte());
za = static_cast<int>(dis->readByte());
xa = ( xa << 24 ) >> 24;
ya = ( ya << 24 ) >> 24;
za = ( za << 24 ) >> 24;
xa *= 16;
ya *= 16;
za *= 16;
useBytes = true;
}
else
{
xa = dis->readShort();
ya = dis->readShort();
za = dis->readShort();
useBytes = false;
}
}
void SetEntityMotionPacket::write(DataOutputStream *dos) //throws IOException
{
if( useBytes )
{
dos->writeShort(id | 0x800);
dos->writeByte(xa/16);
dos->writeByte(ya/16);
dos->writeByte(za/16);
}
else
{
dos->writeShort(id);
dos->writeShort(xa);
dos->writeShort(ya);
dos->writeShort(za);
}
}
void SetEntityMotionPacket::handle(PacketListener *listener)
{
listener->handleSetEntityMotion(shared_from_this());
}
int SetEntityMotionPacket::getEstimatedSize()
{
return useBytes ? 5 : 8;
}
bool SetEntityMotionPacket::canBeInvalidated()
{
return true;
}
bool SetEntityMotionPacket::isInvalidatedBy(shared_ptr<Packet> packet)
{
shared_ptr<SetEntityMotionPacket> target = dynamic_pointer_cast<SetEntityMotionPacket>(packet);
return target->id == id;
}
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