cn.nukkit.entity.ai.executor.MeleeAttackExecutor Maven / Gradle / Ivy
package cn.nukkit.entity.ai.executor;
import cn.nukkit.Player;
import cn.nukkit.Server;
import cn.nukkit.api.PowerNukkitXOnly;
import cn.nukkit.api.Since;
import cn.nukkit.entity.Entity;
import cn.nukkit.entity.EntityCanAttack;
import cn.nukkit.entity.EntityIntelligent;
import cn.nukkit.entity.EntityLiving;
import cn.nukkit.entity.ai.memory.MemoryType;
import cn.nukkit.event.entity.EntityDamageByEntityEvent;
import cn.nukkit.event.entity.EntityDamageEvent;
import cn.nukkit.inventory.EntityInventoryHolder;
import cn.nukkit.item.Item;
import cn.nukkit.item.enchantment.Enchantment;
import cn.nukkit.math.Vector3;
import cn.nukkit.network.protocol.EntityEventPacket;
import cn.nukkit.potion.Effect;
import java.util.EnumMap;
import java.util.Map;
/**
* 通用近战攻击执行器.
*
* Universal melee attack actuator.
*/
@PowerNukkitXOnly
@Since("1.6.0.0-PNX")
public class MeleeAttackExecutor implements EntityControl, IBehaviorExecutor {
protected MemoryType memory;
protected float speed;
protected int maxSenseRangeSquared;
protected boolean clearDataWhenLose;
protected int coolDown;
protected int attackTick;
protected Vector3 oldTarget;
/**
* 用来指定特定的攻击目标.
*
* Used to specify a specific attack target.
*/
@Since("1.19.30-r1")
protected Entity target;
/**
* 用来指定特定的视线目标
*
* Used to specify a specific look target.
*/
@Since("1.19.30-r1")
protected Vector3 lookTarget;
/**
* 给予目标药水效果
*
* Give target potion effect
*/
@Since("1.19.63-r2")
protected Effect[] effects;
public MeleeAttackExecutor(MemoryType memory, float speed, int maxSenseRange, boolean clearDataWhenLose, int coolDown) {
this(memory, speed, maxSenseRange, clearDataWhenLose, coolDown, new Effect[]{});
}
/**
* 近战攻击执行器
*
* @param memory 用于读取攻击目标的记忆
Used to read the memory of the attack target
* @param speed 移动向攻击目标的速度
The speed of movement towards the attacking target
* @param maxSenseRange 最大获取攻击目标范围
The maximum range of attack targets
* @param clearDataWhenLose 失去目标时清空记忆
Clear your memory when you lose your target
* @param coolDown 攻击冷却时间(单位tick)
Attack cooldown (in tick)
* @param effects 给予目标药水效果
Give the target potion effect
*/
public MeleeAttackExecutor(MemoryType memory, float speed, int maxSenseRange, boolean clearDataWhenLose, int coolDown, Effect... effects) {
this.memory = memory;
this.speed = speed;
this.maxSenseRangeSquared = maxSenseRange * maxSenseRange;
this.clearDataWhenLose = clearDataWhenLose;
this.coolDown = coolDown;
this.effects = effects;
}
@Override
public boolean execute(EntityIntelligent entity) {
attackTick++;
if (entity.getBehaviorGroup().getMemoryStorage().isEmpty(memory)) return false;
Entity newTarget = entity.getBehaviorGroup().getMemoryStorage().get(memory);
//first is null
if (this.target == null) {
this.target = newTarget;
}
if (this.lookTarget == null) {
this.lookTarget = target.clone();
}
//some check
if (!target.isAlive()) return false;
else if (target instanceof Player player) {
if (player.isCreative() || player.isSpectator() || !player.isOnline() || !entity.level.getName().equals(player.level.getName())) {
return false;
}
}
//update target and look target
if (!this.target.getPosition().equals(newTarget.getPosition())) {
target = newTarget;
}
if (!this.lookTarget.equals(newTarget.getLocation())) {
lookTarget = newTarget.getLocation();
}
//set some motion control
if (!entity.isEnablePitch()) entity.setEnablePitch(true);
if (entity.getMovementSpeed() != speed) entity.setMovementSpeed(speed);
//set target and look target
setRouteTarget(entity, this.target.clone());
setLookTarget(entity, this.lookTarget.clone());
var floor = target.floor();
if (oldTarget == null || !oldTarget.equals(floor)) entity.getBehaviorGroup().setForceUpdateRoute(true);
oldTarget = floor;
//attack logic
if (entity.distanceSquared(target) <= 2.5 && attackTick > coolDown) {
Item item = entity instanceof EntityInventoryHolder holder ? holder.getItemInHand() : Item.AIR_ITEM;
float defaultDamage = 0;
if (entity instanceof EntityCanAttack entityCanAttack) {
defaultDamage = entityCanAttack.getDiffHandDamage(entity.getServer().getDifficulty());
}
float itemDamage = item.getAttackDamage() + defaultDamage;
Enchantment[] enchantments = item.getEnchantments();
if (item.applyEnchantments()) {
for (Enchantment enchantment : enchantments) {
itemDamage += enchantment.getDamageBonus(target);
}
}
Map damage = new EnumMap<>(EntityDamageEvent.DamageModifier.class);
damage.put(EntityDamageEvent.DamageModifier.BASE, itemDamage);
float knockBack = 0.3f;
if (item.applyEnchantments()) {
Enchantment knockBackEnchantment = item.getEnchantment(Enchantment.ID_KNOCKBACK);
if (knockBackEnchantment != null) {
knockBack += knockBackEnchantment.getLevel() * 0.1f;
}
}
EntityDamageByEntityEvent ev = new EntityDamageByEntityEvent(entity, target, EntityDamageEvent.DamageCause.ENTITY_ATTACK, damage, knockBack, item.applyEnchantments() ? enchantments : null);
ev.setBreakShield(item.canBreakShield());
target.attack(ev);
if (!ev.isCancelled()) {
for (var e : effects) {
target.addEffect(e);
}
playAttackAnimation(entity);
attackTick = 0;
}
return target.getHealth() != 0;
}
return true;
}
@Override
public void onStop(EntityIntelligent entity) {
removeRouteTarget(entity);
removeLookTarget(entity);
//重置速度
entity.setMovementSpeed(EntityLiving.DEFAULT_SPEED);
if (clearDataWhenLose) {
entity.getBehaviorGroup().getMemoryStorage().clear(memory);
}
entity.setEnablePitch(false);
this.target = null;
this.lookTarget = null;
}
@Override
public void onInterrupt(EntityIntelligent entity) {
removeRouteTarget(entity);
removeLookTarget(entity);
//重置速度
entity.setMovementSpeed(EntityLiving.DEFAULT_SPEED);
if (clearDataWhenLose) {
entity.getBehaviorGroup().getMemoryStorage().clear(memory);
}
entity.setEnablePitch(false);
this.target = null;
this.lookTarget = null;
}
protected void playAttackAnimation(EntityIntelligent entity) {
EntityEventPacket pk = new EntityEventPacket();
pk.eid = entity.getId();
pk.event = EntityEventPacket.ARM_SWING;
Server.broadcastPacket(entity.getViewers().values(), pk);
}
}