Enderman.cpp

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#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
 
#include "Chunk.h"
#include "Enderman.h"
#include "../Entities/Player.h"
#include "../LineBlockTracer.h"
 
 
 
 
// cPlayerLookCheck
class cPlayerLookCheck
{
public:
 
    cPlayerLookCheck(Vector3d a_EndermanHeadPosition, int a_SightDistance) :
        m_Player(nullptr),
        m_EndermanHeadPosition(a_EndermanHeadPosition),
        m_SightDistance(a_SightDistance)
    {
    }
 
    bool operator () (cPlayer & a_Player)
    {
        // Don't check players who cannot be targeted
        if (!a_Player.CanMobsTarget())
        {
            return false;
        }
 
        const auto PlayerHeadPosition = a_Player.GetPosition().addedY(a_Player.GetHeight());
        const auto Direction = m_EndermanHeadPosition - PlayerHeadPosition;
 
        // Don't check players who are more than SightDistance (64) blocks away:
        if (Direction.Length() > m_SightDistance)
        {
            return false;
        }
 
        // Don't check if the player has a pumpkin on his head:
        if (a_Player.GetEquippedHelmet().m_ItemType == E_BLOCK_PUMPKIN)
        {
            return false;
        }
 
        const auto LookVector = a_Player.GetLookVector();  // Note: ||LookVector|| is always 1.
        const auto Cosine = Direction.Dot(LookVector) / Direction.Length();  // a.b / (||a|| * ||b||)
 
        // If the player's crosshair is within 5 degrees of the enderman, it counts as looking:
        if ((Cosine < std::cos(0.09)) || (Cosine > std::cos(0)))  // 0.09 rad ~ 5 degrees
        {
            return false;
        }
 
        // TODO: Check if endermen are angered through water in Vanilla
        if (!cLineBlockTracer::LineOfSightTrace(*a_Player.GetWorld(), m_EndermanHeadPosition, PlayerHeadPosition, cLineBlockTracer::losAirWater))
        {
            // No direct line of sight
            return false;
        }
 
        m_Player = &a_Player;
        return true;
    }
 
    cPlayer * GetPlayer(void) const { return m_Player; }
 
protected:
 
    cPlayer * m_Player;
    Vector3d m_EndermanHeadPosition;
    int m_SightDistance;
} ;
 
 
 
 
 
cEnderman::cEnderman(void) :
    Super("Enderman", mtEnderman, "entity.endermen.hurt", "entity.endermen.death", "entity.endermen.ambient", 0.6f, 2.9f),
    m_bIsScreaming(false),
    m_CarriedBlock(E_BLOCK_AIR),
    m_CarriedMeta(0)
{
}
 
 
 
 
 
void cEnderman::GetDrops(cItems & a_Drops, cEntity * a_Killer)
{
    unsigned int LootingLevel = 0;
    if (a_Killer != nullptr)
    {
        LootingLevel = a_Killer->GetEquippedWeapon().m_Enchantments.GetLevel(cEnchantments::enchLooting);
    }
    AddRandomDropItem(a_Drops, 0, 1 + LootingLevel, E_ITEM_ENDER_PEARL);
}
 
 
 
 
 
void cEnderman::CheckEventSeePlayer(cChunk & a_Chunk)
{
    if (GetTarget() != nullptr)
    {
        return;
    }
 
    cPlayerLookCheck Callback(GetPosition().addedY(GetHeight()), m_SightDistance);
    if (m_World->ForEachPlayer(Callback))
    {
        return;
    }
 
    ASSERT(Callback.GetPlayer() != nullptr);
 
    // Target the player:
    cAggressiveMonster::EventSeePlayer(Callback.GetPlayer(), a_Chunk);
    m_bIsScreaming = true;
    GetWorld()->BroadcastEntityMetadata(*this);
}
 
 
 
 
 
void cEnderman::EventLosePlayer()
{
    Super::EventLosePlayer();
    m_bIsScreaming = false;
    GetWorld()->BroadcastEntityMetadata(*this);
}
 
 
 
 
 
void cEnderman::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
{
    Super::Tick(a_Dt, a_Chunk);
    if (!IsTicking())
    {
        // The base class tick destroyed us
        return;
    }
 
    if (m_EMState != CHASING)
    {
        cMonster * EndermiteFound = GetMonsterOfTypeInSight(mtEndermite, 64);
        if (EndermiteFound != nullptr)
        {
            SetTarget(EndermiteFound);
            m_EMState = CHASING;
            m_bIsScreaming = true;
        }
    }
    else
    {
        const auto Target = GetTarget();
        if (Target != nullptr)
        {
            if (!Target->IsTicking())
            {
                m_EMState = IDLE;
                m_bIsScreaming = false;
            }
        }
    }
 
    PREPARE_REL_AND_CHUNK(GetPosition().Floor(), a_Chunk);
    if (!RelSuccess)
    {
        return;
    }
 
    // Take damage when wet:
    if (IsInWater() || Chunk->IsWeatherWetAt(Rel))
    {
        EventLosePlayer();
        TakeDamage(dtEnvironment, nullptr, 1, 0);
        // TODO teleport to a safe location
    }
}