1 files changed, 199 insertions, 0 deletions

diff --git a/src/Items/ItemPotion.h b/src/Items/ItemPotion.h
new file mode 100644
index 000000000..f3afbf99b
--- /dev/null
+++ b/src/Items/ItemPotion.h
@@ -0,0 +1,199 @@
+
+#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;
+	}
+};
+
+
+
+