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Create RegenAuthoritySystem for handling regen
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src/main/java/org/terasology/logic/health/RegenAuthoritySystem.java
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| /* | ||
| * Copyright 2019 MovingBlocks | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.terasology.logic.health; | ||
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| import org.terasology.engine.Time; | ||
| import org.terasology.entitySystem.entity.EntityManager; | ||
| import org.terasology.entitySystem.entity.EntityRef; | ||
| import org.terasology.entitySystem.systems.BaseComponentSystem; | ||
| import org.terasology.entitySystem.systems.RegisterMode; | ||
| import org.terasology.entitySystem.systems.RegisterSystem; | ||
| import org.terasology.entitySystem.systems.UpdateSubscriberSystem; | ||
| import org.terasology.logic.health.event.BeforeRegenEvent; | ||
| import org.terasology.logic.health.event.OnFullyHealedEvent; | ||
| import org.terasology.logic.health.event.OnRegenedEvent; | ||
| import org.terasology.math.TeraMath; | ||
| import org.terasology.registry.In; | ||
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| /** | ||
| * This system handles the natural regeneration of entities with HealthComponent. | ||
| * | ||
| * Logic flow for Regen: | ||
| * - BeforeRegenEvent | ||
| * - (Health regenerated, HealthComponent saved) | ||
| * - OnRegenedEvent | ||
| * - OnFullyHealedEvent (if healed to full health) | ||
| */ | ||
| @RegisterSystem(RegisterMode.AUTHORITY) | ||
| public class RegenAuthoritySystem extends BaseComponentSystem implements UpdateSubscriberSystem { | ||
| /** Integer storing when to check each effect. */ | ||
| private static final int CHECK_INTERVAL = 100; | ||
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| /** Integer storing when to apply regen health */ | ||
| private static final int REGENERATION_TICK = 1000; | ||
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| /** Last time the list of regen effects were checked. */ | ||
| private long lastUpdated; | ||
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| @In | ||
| private Time time; | ||
| @In | ||
| private EntityManager entityManager; | ||
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| /** | ||
| * For every update, check to see if the time's been over the CHECK_INTERVAL. If so, verify if a REGENERATION_TICK | ||
| * has passed for every regeneration effect. | ||
| * | ||
| * @param delta The time (in seconds) since the last engine update. | ||
| */ | ||
| @Override | ||
| public void update(float delta) { | ||
| final long currentTime = time.getGameTimeInMs(); | ||
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| // If the current time passes the CHECK_INTERVAL threshold, regenerate. | ||
| if (currentTime >= lastUpdated + CHECK_INTERVAL) { | ||
| // Set the lastUpdated time to be the currentTime. | ||
| lastUpdated = currentTime; | ||
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| // For every entity with the health component, ignore if it is dead or maxHealth is reached | ||
| // check to see if they have passed a REGENERATION_TICK. If so, regenerate the applicable | ||
| // entities with the given regenAmount. | ||
| for (EntityRef entity : entityManager.getEntitiesWith(HealthComponent.class)) { | ||
| HealthComponent component = entity.getComponent(HealthComponent.class); | ||
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| if (component.currentHealth <= 0) { | ||
| continue; | ||
| } | ||
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| if (component.currentHealth == component.maxHealth || component.regenRate == 0) { | ||
| continue; | ||
| } | ||
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| long lastRegenTick = component.nextRegenTick - REGENERATION_TICK; | ||
| if (currentTime >= lastRegenTick + REGENERATION_TICK) { | ||
| // Calculate this multiplier to account for time delays. | ||
| int multiplier = (int) (currentTime - lastRegenTick) / REGENERATION_TICK; | ||
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| component.nextRegenTick = currentTime + REGENERATION_TICK; | ||
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| int amount = TeraMath.floorToInt(component.regenRate * multiplier); | ||
| checkRegenerated(entity, component, amount); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| private void checkRegenerated(EntityRef entity, HealthComponent health, int healAmount) { | ||
| if (healAmount > 0) { | ||
| BeforeRegenEvent beforeRegen = entity.send(new BeforeRegenEvent(healAmount, entity)); | ||
| if (!beforeRegen.isConsumed()) { | ||
| int modifiedAmount = TeraMath.floorToInt(beforeRegen.getResultValue()); | ||
| if (modifiedAmount > 0) { | ||
| doRegenerate(entity, modifiedAmount, entity); | ||
| } | ||
| } | ||
| entity.saveComponent(health); | ||
| } | ||
| } | ||
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| private void doRegenerate(EntityRef entity, int healAmount, EntityRef instigator) { | ||
| HealthComponent health = entity.getComponent(HealthComponent.class); | ||
| if (health != null) { | ||
| int cappedHealth = Math.min(health.currentHealth + healAmount, health.maxHealth); | ||
| int cappedHealAmount = cappedHealth - health.currentHealth; | ||
| health.currentHealth = cappedHealth; | ||
| entity.saveComponent(health); | ||
| entity.send(new OnRegenedEvent(cappedHealAmount, entity)); | ||
| if (health.currentHealth == health.maxHealth) { | ||
| entity.send(new OnFullyHealedEvent(instigator)); | ||
| } | ||
| } | ||
| } | ||
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| } |