verysecrethero
60 lines
2.6 KiB
C++
60 lines
2.6 KiB
C++
#include "HealthSystem.h"
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#include <algorithm>
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HealthSystem::HealthSystem(EventBroker* eventBroker)
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: PureSystem(eventBroker, "Health")
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{
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//subscribe/listenTo playerdamage,healthpickup events (using the eventBroker)
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EVENT_SUBSCRIBE_MEMBER(m_EPlayerDamage, &HealthSystem::OnPlayerDamaged);
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EVENT_SUBSCRIBE_MEMBER(m_EPlayerHealthPickup, &HealthSystem::OnPlayerHealthPickup);
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}
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void HealthSystem::UpdateComponent(World *world, ComponentWrapper &health, double dt)
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{
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//if entityID of health is 9 then the players ID is also 9 (player,health are connected to the same entity)
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ComponentWrapper player = world->GetComponent(health.EntityID, "Player");
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double maxHealth = (double)health["MaxHealth"];
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//process the DeltaHealthVector and change the entitys health accordingly
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for (size_t i = m_DeltaHealthVector.size(); i > 0; i--)
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{
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auto deltaHP = m_DeltaHealthVector[i - 1];
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//if we have a healthchange for the current player and health is greater than 0, then apply it
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if (std::get<0>(deltaHP) == player.EntityID && (double)health["Health"] > 0.0f) {
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//get the deltaHP value from the tuple and make sure you dont get more than maxHealth
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double newHealth = std::min((double)health["Health"] + (double)std::get<1>(deltaHP), maxHealth);
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health["Health"] = newHealth;
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m_DeltaHealthVector.erase(m_DeltaHealthVector.begin() + i - 1);
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//check if health is <= 0
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if ((double)health["Health"] <= 0.0f) {
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//publish death event
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Events::PlayerDeath e;
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e.PlayerID = player.EntityID;
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m_EventBroker->Publish(e);
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//clear the remaining hpDeltas for the dead player
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for (size_t j = m_DeltaHealthVector.size(); j > 0; j--)
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{
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if (std::get<0>(m_DeltaHealthVector[j - 1]) == player.EntityID)
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m_DeltaHealthVector.erase(m_DeltaHealthVector.begin() + j - 1);
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}
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//break the loop if the player is dead
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break;
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}
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}
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}
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}
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bool HealthSystem::OnPlayerDamaged(const Events::PlayerDamage& e)
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{
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//save the changed HP to a vector. it will be taken care of in UpdateComponent
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m_DeltaHealthVector.push_back(std::make_tuple(e.PlayerDamagedID, -e.DamageAmount));
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return true;
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}
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bool HealthSystem::OnPlayerHealthPickup(const Events::PlayerHealthPickup& e)
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{
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//save the changed HP to a vector. it will be taken care of in UpdateComponent
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m_DeltaHealthVector.push_back(std::make_tuple(e.PlayerHealedID, e.HealthAmount));
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return true;
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}
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