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