net.minestom.server.entity.LivingEntity Maven / Gradle / Ivy
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package net.minestom.server.entity;
import net.kyori.adventure.sound.Sound.Source;
import net.minestom.server.collision.BoundingBox;
import net.minestom.server.coordinate.Point;
import net.minestom.server.coordinate.Vec;
import net.minestom.server.entity.attribute.Attribute;
import net.minestom.server.entity.attribute.AttributeInstance;
import net.minestom.server.entity.attribute.AttributeModifier;
import net.minestom.server.entity.attribute.AttributeOperation;
import net.minestom.server.entity.damage.Damage;
import net.minestom.server.entity.damage.DamageType;
import net.minestom.server.entity.metadata.EntityMeta;
import net.minestom.server.entity.metadata.LivingEntityMeta;
import net.minestom.server.event.EventDispatcher;
import net.minestom.server.event.entity.EntityDamageEvent;
import net.minestom.server.event.entity.EntityDeathEvent;
import net.minestom.server.event.entity.EntityFireExtinguishEvent;
import net.minestom.server.event.entity.EntitySetFireEvent;
import net.minestom.server.event.item.EntityEquipEvent;
import net.minestom.server.event.item.PickupItemEvent;
import net.minestom.server.instance.EntityTracker;
import net.minestom.server.inventory.EquipmentHandler;
import net.minestom.server.item.ItemComponent;
import net.minestom.server.item.ItemStack;
import net.minestom.server.item.component.AttributeList;
import net.minestom.server.network.ConnectionState;
import net.minestom.server.network.packet.server.LazyPacket;
import net.minestom.server.network.packet.server.play.*;
import net.minestom.server.network.player.PlayerConnection;
import net.minestom.server.registry.DynamicRegistry;
import net.minestom.server.scoreboard.Team;
import net.minestom.server.sound.SoundEvent;
import net.minestom.server.thread.Acquirable;
import net.minestom.server.utils.NamespaceID;
import net.minestom.server.utils.block.BlockIterator;
import net.minestom.server.utils.time.Cooldown;
import net.minestom.server.utils.time.TimeUnit;
import org.jetbrains.annotations.ApiStatus;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.UnmodifiableView;
import java.time.Duration;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
public class LivingEntity extends Entity implements EquipmentHandler {
private static final AttributeModifier SPRINTING_SPEED_MODIFIER = new AttributeModifier(NamespaceID.from("minecraft:sprinting"), 0.3, AttributeOperation.MULTIPLY_TOTAL);
/**
* IDs of modifiers that are protected from removal by methods like {@link AttributeInstance#clearModifiers()}.
*/
@ApiStatus.Internal
public static final Set PROTECTED_MODIFIERS = Set.of(SPRINTING_SPEED_MODIFIER.id());
// ItemStack pickup
protected boolean canPickupItem;
protected Cooldown itemPickupCooldown = new Cooldown(Duration.of(5, TimeUnit.SERVER_TICK));
protected boolean isDead;
protected Damage lastDamage;
// Bounding box used for items' pickup (see LivingEntity#setBoundingBox)
protected BoundingBox expandedBoundingBox;
private final Map attributeModifiers = new ConcurrentHashMap<>();
private final Collection unmodifiableModifiers =
Collections.unmodifiableCollection(attributeModifiers.values());
// Abilities
protected boolean invulnerable;
/**
* Ticks until this entity must be extinguished
*/
private int remainingFireTicks;
private Team team;
private int arrowCount;
private float health = 1F;
// Equipments
private ItemStack mainHandItem = ItemStack.AIR;
private ItemStack offHandItem = ItemStack.AIR;
private ItemStack helmet = ItemStack.AIR;
private ItemStack chestplate = ItemStack.AIR;
private ItemStack leggings = ItemStack.AIR;
private ItemStack boots = ItemStack.AIR;
private ItemStack bodyEquipment = ItemStack.AIR;
/**
* Constructor which allows to specify an UUID. Only use if you know what you are doing!
*/
public LivingEntity(@NotNull EntityType entityType, @NotNull UUID uuid) {
super(entityType, uuid);
}
public LivingEntity(@NotNull EntityType entityType) {
this(entityType, UUID.randomUUID());
}
@Override
public void setSprinting(boolean sprinting) {
super.setSprinting(sprinting);
// We must set the sprinting attribute serverside because when we resend modifiers it overwrites what
// the client has, meaning if they are sprinting and we send no modifiers, they will no longer be
// getting the speed boost of sprinting.
final AttributeInstance speed = getAttribute(Attribute.GENERIC_MOVEMENT_SPEED);
if (sprinting) speed.addModifier(SPRINTING_SPEED_MODIFIER);
else speed.removeModifier(SPRINTING_SPEED_MODIFIER);
}
@Override
public @NotNull ItemStack getEquipment(@NotNull EquipmentSlot slot) {
return switch (slot) {
case MAIN_HAND -> mainHandItem;
case OFF_HAND -> offHandItem;
case BOOTS -> boots;
case LEGGINGS -> leggings;
case CHESTPLATE -> chestplate;
case HELMET -> helmet;
case BODY -> bodyEquipment;
};
}
@Override
public void setEquipment(@NotNull EquipmentSlot slot, @NotNull ItemStack itemStack) {
ItemStack oldItem = getEquipment(slot);
ItemStack newItem = slotChangeEvent(itemStack, slot);
switch (slot) {
case MAIN_HAND -> mainHandItem = newItem;
case OFF_HAND -> offHandItem = newItem;
case BOOTS -> boots = newItem;
case LEGGINGS -> leggings = newItem;
case CHESTPLATE -> chestplate = newItem;
case HELMET -> helmet = newItem;
case BODY -> bodyEquipment = newItem;
}
syncEquipment(slot);
updateEquipmentAttributes(oldItem, newItem, slot);
}
private ItemStack slotChangeEvent(@NotNull ItemStack itemStack, @NotNull EquipmentSlot slot) {
EntityEquipEvent entityEquipEvent = new EntityEquipEvent(this, itemStack, slot);
EventDispatcher.call(entityEquipEvent);
return entityEquipEvent.getEquippedItem();
}
/**
* Updates the current attributes of the living entity based on
*
* @param oldItemStack The ItemStack that has been removed, modifiers on this stack will be removed from the entity
* @param newItemStack The ItemStack that has been added, modifiers on this stack will be added to the entity
* @param slot The slot that changed, this will determine what modifiers are actually changed
*/
@ApiStatus.Internal
public void updateEquipmentAttributes(@NotNull ItemStack oldItemStack, @NotNull ItemStack newItemStack, @NotNull EquipmentSlot slot) {
AttributeList oldAttributes = oldItemStack.get(ItemComponent.ATTRIBUTE_MODIFIERS);
// Remove old attributes
if (oldAttributes != null) {
for (AttributeList.Modifier modifier : oldAttributes.modifiers()) {
// If the modifier currently modifies the slot we are updating
if (modifier.slot().contains(slot)) {
AttributeInstance attributeInstance = getAttribute(modifier.attribute());
attributeInstance.removeModifier(modifier.modifier().id());
}
}
}
AttributeList newAttributes = newItemStack.get(ItemComponent.ATTRIBUTE_MODIFIERS);
// Add new attributes
if (newAttributes != null) {
for (AttributeList.Modifier modifier : newAttributes.modifiers()) {
// If the modifier currently modifies the slot we are updating
if (modifier.slot().contains(slot)) {
AttributeInstance attributeInstance = getAttribute(modifier.attribute());
attributeInstance.addModifier(modifier.modifier());
}
}
}
}
@Override
public void update(long time) {
// Fire
if (remainingFireTicks > 0 && --remainingFireTicks == 0) {
EventDispatcher.callCancellable(new EntityFireExtinguishEvent(this, true), () -> entityMeta.setOnFire(false));
}
// Items picking
if (canPickupItem() && itemPickupCooldown.isReady(time)) {
itemPickupCooldown.refreshLastUpdate(time);
final Point loweredPosition = position.sub(0, .5, 0);
this.instance.getEntityTracker().nearbyEntities(position, expandedBoundingBox.width(),
EntityTracker.Target.ITEMS, itemEntity -> {
if (this instanceof Player player && !itemEntity.isViewer(player)) return;
if (!itemEntity.isPickable()) return;
if (expandedBoundingBox.intersectEntity(loweredPosition, itemEntity)) {
PickupItemEvent pickupItemEvent = new PickupItemEvent(this, itemEntity);
EventDispatcher.callCancellable(pickupItemEvent, () -> {
final ItemStack item = itemEntity.getItemStack();
sendPacketToViewersAndSelf(new CollectItemPacket(itemEntity.getEntityId(), getEntityId(), item.amount()));
itemEntity.remove();
});
}
});
}
}
/**
* Gets the amount of arrows in the entity.
*
* @return the arrow count
*/
public int getArrowCount() {
return this.arrowCount;
}
/**
* Changes the amount of arrow stuck in the entity.
*
* @param arrowCount the arrow count
*/
public void setArrowCount(int arrowCount) {
this.arrowCount = arrowCount;
LivingEntityMeta meta = getLivingEntityMeta();
if (meta != null) {
meta.setArrowCount(arrowCount);
}
}
/**
* Gets if the entity is invulnerable.
*
* @return true if the entity is invulnerable
*/
public boolean isInvulnerable() {
return invulnerable;
}
/**
* Makes the entity vulnerable or invulnerable.
*
* @param invulnerable should the entity be invulnerable
*/
public void setInvulnerable(boolean invulnerable) {
this.invulnerable = invulnerable;
}
/**
* Kills the entity, trigger the {@link EntityDeathEvent} event.
*/
public void kill() {
refreshIsDead(true); // So the entity isn't killed over and over again
triggerStatus((byte) 3); // Start death animation status
setPose(Pose.DYING);
setHealth(0);
// Reset velocity
this.velocity = Vec.ZERO;
// Remove passengers if any
if (hasPassenger()) {
getPassengers().forEach(this::removePassenger);
}
EntityDeathEvent entityDeathEvent = new EntityDeathEvent(this);
EventDispatcher.call(entityDeathEvent);
}
/**
* Gets the amount of ticks this entity is on fire for.
*
* @return the remaining duration of fire in ticks, 0 if not on fire
*/
public int getFireTicks() {
return remainingFireTicks;
}
/**
* Sets this entity on fire for the given ticks.
*
* @param ticks duration of fire in ticks
*/
public void setFireTicks(int ticks) {
int fireTicks = Math.max(0, ticks);
if (fireTicks > 0) {
EntitySetFireEvent entitySetFireEvent = new EntitySetFireEvent(this, ticks);
EventDispatcher.call(entitySetFireEvent);
if (entitySetFireEvent.isCancelled()) return;
fireTicks = Math.max(0, entitySetFireEvent.getFireTicks());
if (fireTicks > 0) {
remainingFireTicks = fireTicks;
entityMeta.setOnFire(true);
return;
}
}
if (remainingFireTicks != 0) {
EntityFireExtinguishEvent entityFireExtinguishEvent = new EntityFireExtinguishEvent(this, false);
EventDispatcher.callCancellable(entityFireExtinguishEvent, () -> entityMeta.setOnFire(false));
}
remainingFireTicks = fireTicks;
}
public boolean damage(@NotNull DynamicRegistry.Key type, float amount) {
return damage(new Damage(type, null, null, null, amount));
}
/**
* Damages the entity by a value, the type of the damage also has to be specified.
*
* @param damage the damage to be applied
* @return true if damage has been applied, false if it didn't
*/
public boolean damage(@NotNull Damage damage) {
if (isDead())
return false;
if (isInvulnerable() || isImmune(damage.getType())) {
return false;
}
EntityDamageEvent entityDamageEvent = new EntityDamageEvent(this, damage, damage.getSound(this));
EventDispatcher.callCancellable(entityDamageEvent, () -> {
// Set the last damage type since the event is not cancelled
this.lastDamage = entityDamageEvent.getDamage();
float remainingDamage = entityDamageEvent.getDamage().getAmount();
if (entityDamageEvent.shouldAnimate()) {
sendPacketToViewersAndSelf(new EntityAnimationPacket(getEntityId(), EntityAnimationPacket.Animation.TAKE_DAMAGE));
}
sendPacketToViewersAndSelf(new DamageEventPacket(getEntityId(), damage.getTypeId(), damage.getAttacker() == null ? 0 : damage.getAttacker().getEntityId() + 1, damage.getSource() == null ? 0 : damage.getSource().getEntityId() + 1, damage.getSourcePosition()));
// Additional hearts support
if (this instanceof Player player) {
final float additionalHearts = player.getAdditionalHearts();
if (additionalHearts > 0) {
if (remainingDamage > additionalHearts) {
remainingDamage -= additionalHearts;
player.setAdditionalHearts(0);
} else {
player.setAdditionalHearts(additionalHearts - remainingDamage);
remainingDamage = 0;
}
}
}
// Set the final entity health
setHealth(getHealth() - remainingDamage);
// play damage sound
final SoundEvent sound = entityDamageEvent.getSound();
if (sound != null) {
Source soundCategory;
if (this instanceof Player) {
soundCategory = Source.PLAYER;
} else {
// TODO: separate living entity categories
soundCategory = Source.HOSTILE;
}
sendPacketToViewersAndSelf(new SoundEffectPacket(sound, soundCategory, getPosition(), 1.0f, 1.0f, 0));
}
});
return !entityDamageEvent.isCancelled();
}
/**
* Is this entity immune to the given type of damage?
*
* @param type the type of damage
* @return true if this entity is immune to the given type of damage
*/
public boolean isImmune(@NotNull DynamicRegistry.Key type) {
return false;
}
/**
* Gets the entity health.
*
* @return the entity health
*/
public float getHealth() {
return this.health;
}
/**
* Changes the entity health, kill it if {@code health} is <= 0 and is not dead yet.
*
* @param health the new entity health
*/
public void setHealth(float health) {
this.health = Math.min(health, (float) getAttributeValue(Attribute.GENERIC_MAX_HEALTH));
if (this.health <= 0 && !isDead) {
kill();
}
LivingEntityMeta meta = getLivingEntityMeta();
if (meta != null) {
meta.setHealth(this.health);
}
}
/**
* Gets the last damage source which damaged of this entity.
*
* @return the last damage source, null if not any
*/
public @Nullable Damage getLastDamageSource() {
return lastDamage;
}
/**
* Sets the heal of the entity as its max health.
*
* Retrieved from {@link #getAttributeValue(Attribute)} with the attribute {@link Attribute#GENERIC_MAX_HEALTH}.
*/
public void heal() {
setHealth((float) getAttributeValue(Attribute.GENERIC_MAX_HEALTH));
}
/**
* Retrieves the attribute instance and its modifiers.
*
* @param attribute the attribute instance to get
* @return the attribute instance
*/
public @NotNull AttributeInstance getAttribute(@NotNull Attribute attribute) {
return attributeModifiers.computeIfAbsent(attribute.name(),
s -> new AttributeInstance(attribute, this::onAttributeChanged));
}
/**
* Retrieves all {@link AttributeInstance}s on this entity.
*
* @return a collection of all attribute instances on this entity
*/
public @NotNull @UnmodifiableView Collection getAttributes() {
return unmodifiableModifiers;
}
/**
* Callback used when an attribute instance has been modified.
*
* @param attributeInstance the modified attribute instance
*/
protected void onAttributeChanged(@NotNull AttributeInstance attributeInstance) {
boolean self = false;
if (this instanceof Player player) {
PlayerConnection playerConnection = player.playerConnection;
// connection null during Player initialization (due to #super call)
self = playerConnection != null && playerConnection.getConnectionState() == ConnectionState.PLAY;
}
EntityAttributesPacket propertiesPacket = new EntityAttributesPacket(getEntityId(), List.of(
new EntityAttributesPacket.Property(
attributeInstance.attribute(),
attributeInstance.getBaseValue(),
attributeInstance.getModifiers())
));
if (self) {
sendPacketToViewersAndSelf(propertiesPacket);
} else {
sendPacketToViewers(propertiesPacket);
}
}
/**
* Retrieves the attribute value.
*
* @param attribute the attribute value to get
* @return the attribute value
*/
public double getAttributeValue(@NotNull Attribute attribute) {
AttributeInstance instance = attributeModifiers.get(attribute.name());
return (instance != null) ? instance.getValue() : attribute.defaultValue();
}
/**
* Gets if the entity is dead or not.
*
* @return true if the entity is dead
*/
public boolean isDead() {
return isDead;
}
/**
* Gets if the entity is able to pickup items.
*
* @return true if the entity is able to pickup items
*/
public boolean canPickupItem() {
return canPickupItem;
}
/**
* When set to false, the entity will not be able to pick {@link ItemEntity} on the ground.
*
* @param canPickupItem can the entity pickup item
*/
public void setCanPickupItem(boolean canPickupItem) {
this.canPickupItem = canPickupItem;
}
@Override
public void updateNewViewer(@NotNull Player player) {
super.updateNewViewer(player);
player.sendPacket(new LazyPacket(this::getEquipmentsPacket));
player.sendPacket(new LazyPacket(this::getPropertiesPacket));
}
@Override
public void setBoundingBox(BoundingBox boundingBox) {
super.setBoundingBox(boundingBox);
this.expandedBoundingBox = boundingBox.expand(1, .5, 1);
}
/**
* Sends a {@link EntityAnimationPacket} to swing the main hand
* (can be used for attack animation).
*/
public void swingMainHand() {
swingMainHand(false);
}
/**
* Sends a {@link EntityAnimationPacket} to swing the off hand
* (can be used for attack animation).
*/
public void swingOffHand() {
swingOffHand(false);
}
/**
* Sends a {@link EntityAnimationPacket} to swing the main hand
* (can be used for attack animation).
*
* @param fromClient if true, broadcast only to viewers
*/
@ApiStatus.Internal
public void swingMainHand(boolean fromClient) {
swingHand(fromClient, EntityAnimationPacket.Animation.SWING_MAIN_ARM);
}
/**
* Sends a {@link EntityAnimationPacket} to swing the off hand
* (can be used for attack animation).
*
* @param fromClient if true, broadcast only to viewers
*/
@ApiStatus.Internal
public void swingOffHand(boolean fromClient) {
swingHand(fromClient, EntityAnimationPacket.Animation.SWING_OFF_HAND);
}
private void swingHand(boolean fromClient, EntityAnimationPacket.Animation animation) {
EntityAnimationPacket packet = new EntityAnimationPacket(getEntityId(), animation);
if (fromClient) {
sendPacketToViewers(packet);
} else {
sendPacketToViewersAndSelf(packet);
}
}
public void refreshActiveHand(boolean isHandActive, boolean offHand, boolean riptideSpinAttack) {
LivingEntityMeta meta = getLivingEntityMeta();
if (meta != null) {
meta.setNotifyAboutChanges(false);
meta.setHandActive(isHandActive);
meta.setActiveHand(offHand ? Player.Hand.OFF : Player.Hand.MAIN);
meta.setInRiptideSpinAttack(riptideSpinAttack);
meta.setNotifyAboutChanges(true);
updatePose(); // Riptide spin attack has a pose
}
}
public boolean isFlyingWithElytra() {
return this.entityMeta.isFlyingWithElytra();
}
public void setFlyingWithElytra(boolean isFlying) {
this.entityMeta.setFlyingWithElytra(isFlying);
updatePose();
}
/**
* Used to change the {@code isDead} internal field.
*
* @param isDead the new field value
*/
protected void refreshIsDead(boolean isDead) {
this.isDead = isDead;
}
/**
* Gets an {@link EntityAttributesPacket} for this entity with all of its attributes values.
*
* @return an {@link EntityAttributesPacket} linked to this entity
*/
protected @NotNull EntityAttributesPacket getPropertiesPacket() {
List properties = new ArrayList<>();
for (AttributeInstance instance : attributeModifiers.values()) {
properties.add(new EntityAttributesPacket.Property(instance.attribute(), instance.getBaseValue(), instance.getModifiers()));
}
return new EntityAttributesPacket(getEntityId(), properties);
}
/**
* Changes the {@link Team} for the entity.
*
* @param team The new team
*/
public void setTeam(@Nullable Team team) {
if (this.team == team) return;
String member = this instanceof Player player ? player.getUsername() : getUuid().toString();
if (this.team != null) {
this.team.removeMember(member);
}
this.team = team;
if (team != null) {
team.addMember(member);
}
}
/**
* Gets the {@link Team} of the entity.
*
* @return the {@link Team}
*/
public @Nullable Team getTeam() {
return team;
}
/**
* Gets the target (not-air) block position of the entity.
*
* @param maxDistance The max distance to scan before returning null
* @return The block position targeted by this entity, null if non are found
*/
public @Nullable Point getTargetBlockPosition(int maxDistance) {
Iterator it = new BlockIterator(this, maxDistance);
while (it.hasNext()) {
final Point position = it.next();
if (!getInstance().getBlock(position).isAir()) return position;
}
return null;
}
/**
* Gets {@link EntityMeta} of this entity casted to {@link LivingEntityMeta}.
*
* @return null if meta of this entity does not inherit {@link LivingEntityMeta}, casted value otherwise.
*/
public @Nullable LivingEntityMeta getLivingEntityMeta() {
if (this.entityMeta instanceof LivingEntityMeta) {
return (LivingEntityMeta) this.entityMeta;
}
return null;
}
/**
* Applies knockback
*
* Note: The strength is reduced based on knockback resistance
*
* @param strength the strength of the knockback, 0.4 is the vanilla value for a bare hand hit
* @param x knockback on x axle, for default knockback use the following formula
sin(attacker.yaw * (pi/180))
* @param z knockback on z axle, for default knockback use the following formula -cos(attacker.yaw * (pi/180))
*/
@Override
public void takeKnockback(float strength, final double x, final double z) {
strength *= (float) (1 - getAttributeValue(Attribute.GENERIC_KNOCKBACK_RESISTANCE));
super.takeKnockback(strength, x, z);
}
@SuppressWarnings("unchecked")
@ApiStatus.Experimental
@Override
public @NotNull Acquirable acquirable() {
return (Acquirable) super.acquirable();
}
}