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#pragma once
#include "../Entities/EntityEffect.h"
#include "../Entities/SplashPotionEntity.h"
class cItemPotionHandler:
public cItemHandler
{
typedef cItemHandler super;
public:
cItemPotionHandler():
super(E_ITEM_POTION)
{
}
/** Returns the potion particle type (used by the client for visuals), based on the potion's damage value */
static int GetPotionParticleType(short a_ItemDamage)
{
// Lowest six bits
return (a_ItemDamage & 0x3f);
}
/** Translates the potion's damage value into the entity effect that the potion gives */
static cEntityEffect::eType GetEntityEffectType(short a_ItemDamage)
{
// Lowest four bits
// Potion effect bits are different from entity effect values
// For reference: http://minecraft.gamepedia.com/Data_values#.22Potion_effect.22_bits
switch (a_ItemDamage & 0x0f)
{
case 0x01: return cEntityEffect::effRegeneration;
case 0x02: return cEntityEffect::effSpeed;
case 0x03: return cEntityEffect::effFireResistance;
case 0x04: return cEntityEffect::effPoison;
case 0x05: return cEntityEffect::effInstantHealth;
case 0x06: return cEntityEffect::effNightVision;
case 0x08: return cEntityEffect::effWeakness;
case 0x09: return cEntityEffect::effStrength;
case 0x0a: return cEntityEffect::effSlowness;
case 0x0c: return cEntityEffect::effInstantDamage;
case 0x0d: return cEntityEffect::effWaterBreathing;
case 0x0e: return cEntityEffect::effInvisibility;
// No effect potions
case 0x00:
case 0x07:
case 0x0b: // Will be potion of leaping in 1.8
case 0x0f:
{
break;
}
}
return cEntityEffect::effNoEffect;
}
/** Retrieves the intensity level from the potion's damage value.
Returns 0 for level I potions, 1 for level II potions. */
static short GetEntityEffectIntensity(short a_ItemDamage)
{
// Level II potion if the fifth lowest bit is set
return ((a_ItemDamage & 0x20) != 0) ? 1 : 0;
}
/** Returns the effect duration, in ticks, based on the potion's damage value */
static int GetEntityEffectDuration(short a_ItemDamage)
{
// Base duration in ticks
int base = 0;
double TierCoeff = 1, ExtCoeff = 1, SplashCoeff = 1;
switch (GetEntityEffectType(a_ItemDamage))
{
case cEntityEffect::effRegeneration:
case cEntityEffect::effPoison:
{
base = 900;
break;
}
case cEntityEffect::effSpeed:
case cEntityEffect::effFireResistance:
case cEntityEffect::effNightVision:
case cEntityEffect::effStrength:
case cEntityEffect::effWaterBreathing:
case cEntityEffect::effInvisibility:
{
base = 3600;
break;
}
case cEntityEffect::effWeakness:
case cEntityEffect::effSlowness:
{
base = 1800;
break;
}
}
// If potion is level II, half the duration. If not, stays the same
TierCoeff = (GetEntityEffectIntensity(a_ItemDamage) > 0) ? 0.5 : 1;
// If potion is extended, multiply duration by 8/3. If not, stays the same
// Extended potion if sixth lowest bit is set
ExtCoeff = (a_ItemDamage & 0x40) ? (8.0 / 3.0) : 1;
// If potion is splash potion, multiply duration by 3/4. If not, stays the same
SplashCoeff = IsPotionDrinkable(a_ItemDamage) ? 1 : 0.75;
// Ref.:
// http://minecraft.gamepedia.com/Data_values#.22Tier.22_bit
// http://minecraft.gamepedia.com/Data_values#.22Extended_duration.22_bit
// http://minecraft.gamepedia.com/Data_values#.22Splash_potion.22_bit
return (int)(base * TierCoeff * ExtCoeff * SplashCoeff);
}
/** Returns true if the potion with the given damage is drinkable */
static bool IsPotionDrinkable(short a_ItemDamage)
{
// Drinkable potion if 13th lowest bit is set
// Ref.: http://minecraft.gamepedia.com/Potions#Data_value_table
return ((a_ItemDamage & 0x2000) != 0);
}
// cItemHandler overrides:
virtual bool IsDrinkable(short a_ItemDamage) override
{
// Drinkable potion if 13th lowest bit is set
// Ref.: http://minecraft.gamepedia.com/Potions#Data_value_table
return IsPotionDrinkable(a_ItemDamage);
}
virtual bool OnItemUse(cWorld * a_World, cPlayer * a_Player, const cItem & a_Item, int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_Dir) override
{
short PotionDamage = a_Item.m_ItemDamage;
// Do not throw non-splash potions:
if (IsPotionDrinkable(PotionDamage))
{
return false;
}
Vector3d Pos = a_Player->GetThrowStartPos();
Vector3d Speed = a_Player->GetLookVector() * 7;
cSplashPotionEntity * Projectile = new cSplashPotionEntity(
a_Player, Pos.x, Pos.y, Pos.z, Speed,
GetEntityEffectType(PotionDamage), cEntityEffect(GetEntityEffectDuration(PotionDamage),
GetEntityEffectIntensity(PotionDamage)), GetPotionParticleType(PotionDamage)
);
if (Projectile == NULL)
{
return false;
}
if (!Projectile->Initialize(*a_World))
{
delete Projectile;
return false;
}
if (!a_Player->IsGameModeCreative())
{
a_Player->GetInventory().RemoveOneEquippedItem();
}
return true;
}
virtual bool EatItem(cPlayer * a_Player, cItem * a_Item) override
{
short PotionDamage = a_Item->m_ItemDamage;
// Do not drink undrinkable potions:
if (!IsDrinkable(a_Item->m_ItemDamage))
{
return false;
}
a_Player->AddEntityEffect(GetEntityEffectType(PotionDamage), GetEntityEffectDuration(PotionDamage), GetEntityEffectIntensity(PotionDamage));
a_Player->GetInventory().RemoveOneEquippedItem();
a_Player->GetInventory().AddItem(E_ITEM_GLASS_BOTTLE);
return true;
}
};
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