Feature #956: Implement blocking melee attacks
scrawl
11 years ago
parent
82a07af72c
commit
16f5f5862d
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#include "combat.hpp"
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#include <OgreSceneNode.h>
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#include "../mwbase/environment.hpp"
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#include "../mwbase/world.hpp"
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#include "../mwmechanics/creaturestats.hpp"
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#include "../mwmechanics/movement.hpp"
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#include "../mwworld/class.hpp"
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#include "../mwworld/inventorystore.hpp"
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namespace
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{
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Ogre::Radian signedAngle(Ogre::Vector3 v1, Ogre::Vector3 v2, Ogre::Vector3 n)
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{
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return Ogre::Math::ATan2(
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n.dotProduct( v1.crossProduct(v2) ),
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v1.dotProduct(v2)
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);
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}
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}
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namespace MWMechanics
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{
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bool blockMeleeAttack(const MWWorld::Ptr &attacker, const MWWorld::Ptr &blocker, const MWWorld::Ptr &weapon, float damage)
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{
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if (!blocker.getClass().hasInventoryStore(blocker))
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return false;
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if (blocker.getClass().getCreatureStats(blocker).getKnockedDown()
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|| blocker.getClass().getCreatureStats(blocker).getHitRecovery())
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return false;
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MWWorld::InventoryStore& inv = blocker.getClass().getInventoryStore(blocker);
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MWWorld::ContainerStoreIterator shield = inv.getSlot(MWWorld::InventoryStore::Slot_CarriedLeft);
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if (shield == inv.end() || shield->getTypeName() != typeid(ESM::Armor).name())
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return false;
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Ogre::Degree angle = signedAngle (Ogre::Vector3(attacker.getRefData().getPosition().pos) - Ogre::Vector3(blocker.getRefData().getPosition().pos),
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blocker.getRefData().getBaseNode()->getOrientation().yAxis(), Ogre::Vector3(0,0,1));
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const MWWorld::Store<ESM::GameSetting>& gmst = MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>();
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if (angle.valueDegrees() < gmst.find("fCombatBlockLeftAngle")->getFloat())
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return false;
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if (angle.valueDegrees() > gmst.find("fCombatBlockRightAngle")->getFloat())
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return false;
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MWMechanics::CreatureStats& blockerStats = blocker.getClass().getCreatureStats(blocker);
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if (blockerStats.getDrawState() == DrawState_Spell)
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return false;
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MWMechanics::CreatureStats& attackerStats = attacker.getClass().getCreatureStats(attacker);
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float blockTerm = blocker.getClass().getSkill(blocker, ESM::Skill::Block) + 0.2 * blockerStats.getAttribute(ESM::Attribute::Agility).getModified()
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+ 0.1 * blockerStats.getAttribute(ESM::Attribute::Luck).getModified();
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float enemySwing = attackerStats.getAttackStrength();
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float swingTerm = enemySwing * gmst.find("fSwingBlockMult")->getFloat() + gmst.find("fSwingBlockBase")->getFloat();
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float blockerTerm = blockTerm * swingTerm;
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if (blocker.getClass().getMovementSettings(blocker).mPosition[1] <= 0)
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blockerTerm *= gmst.find("fBlockStillBonus")->getFloat();
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blockerTerm *= blockerStats.getFatigueTerm();
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float attackerSkill = attacker.getClass().getSkill(attacker, weapon.getClass().getEquipmentSkill(weapon));
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float attackerTerm = attackerSkill + 0.2 * attackerStats.getAttribute(ESM::Attribute::Agility).getModified()
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+ 0.1 * attackerStats.getAttribute(ESM::Attribute::Luck).getModified();
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attackerTerm *= attackerStats.getFatigueTerm();
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int x = int(blockerTerm - attackerTerm);
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int iBlockMaxChance = gmst.find("iBlockMaxChance")->getInt();
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int iBlockMinChance = gmst.find("iBlockMinChance")->getInt();
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x = std::min(iBlockMaxChance, std::max(iBlockMinChance, x));
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int roll = std::rand()/ (static_cast<double> (RAND_MAX) + 1) * 100; // [0, 99]
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if (roll < x)
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{
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// Reduce shield durability by incoming damage
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if (shield->getCellRef().mCharge == -1)
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shield->getCellRef().mCharge = shield->getClass().getItemMaxHealth(*shield);
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shield->getCellRef().mCharge -= std::min(shield->getCellRef().mCharge, int(damage));
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if (!shield->getCellRef().mCharge)
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inv.unequipItem(*shield, blocker);
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// Reduce blocker fatigue
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const float fFatigueBlockBase = gmst.find("fFatigueBlockBase")->getFloat();
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const float fFatigueBlockMult = gmst.find("fFatigueBlockMult")->getFloat();
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const float fWeaponFatigueBlockMult = gmst.find("fWeaponFatigueBlockMult")->getFloat();
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MWMechanics::DynamicStat<float> fatigue = blockerStats.getFatigue();
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float normalizedEncumbrance = blocker.getClass().getEncumbrance(blocker) / blocker.getClass().getCapacity(blocker);
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normalizedEncumbrance = std::min(1.f, normalizedEncumbrance);
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float fatigueLoss = fFatigueBlockBase + normalizedEncumbrance * fFatigueBlockMult;
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fatigueLoss += weapon.getClass().getWeight(weapon) * attackerStats.getAttackStrength() * fWeaponFatigueBlockMult;
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fatigue.setCurrent(fatigue.getCurrent() - fatigueLoss);
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blockerStats.setFatigue(fatigue);
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blockerStats.setBlock(true);
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if (blocker.getClass().isNpc())
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blocker.getClass().skillUsageSucceeded(blocker, ESM::Skill::Block, 0);
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return true;
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}
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return false;
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}
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}
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@ -0,0 +1,14 @@
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#ifndef OPENMW_MECHANICS_COMBAT_H
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#define OPENMW_MECHANICS_COMBAT_H
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#include "../mwworld/ptr.hpp"
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namespace MWMechanics
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{
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/// @return can we block the attack?
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bool blockMeleeAttack (const MWWorld::Ptr& attacker, const MWWorld::Ptr& blocker, const MWWorld::Ptr& weapon, float damage);
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}
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#endif
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