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Diffstat (limited to 'src/Items/ItemPotion.h')
| -rw-r--r-- | src/Items/ItemPotion.h | 199 |
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; + } +}; + + + + |