package net.minecraft.world.level; import java.util.Optional; import java.util.function.Function; import net.minecraft.core.BlockPos; import net.minecraft.core.particles.ParticleTypes; import net.minecraft.core.registries.BuiltInRegistries; import net.minecraft.nbt.CompoundTag; import net.minecraft.server.level.ServerLevel; import net.minecraft.util.RandomSource; import net.minecraft.util.random.WeightedList; import net.minecraft.world.Difficulty; import net.minecraft.world.entity.Entity; import net.minecraft.world.entity.EntitySelector; import net.minecraft.world.entity.EntitySpawnReason; import net.minecraft.world.entity.EntityType; import net.minecraft.world.entity.Mob; import net.minecraft.world.entity.SpawnPlacements; import net.minecraft.world.level.entity.EntityTypeTest; import net.minecraft.world.level.gameevent.GameEvent; import net.minecraft.world.phys.AABB; import net.minecraft.world.phys.Vec3; import org.jetbrains.annotations.Nullable; public abstract class BaseSpawner { public static final String SPAWN_DATA_TAG = "SpawnData"; private static final int EVENT_SPAWN = 1; private static final int DEFAULT_SPAWN_DELAY = 20; private static final int DEFAULT_MIN_SPAWN_DELAY = 200; private static final int DEFAULT_MAX_SPAWN_DELAY = 800; private static final int DEFAULT_SPAWN_COUNT = 4; private static final int DEFAULT_MAX_NEARBY_ENTITIES = 6; private static final int DEFAULT_REQUIRED_PLAYER_RANGE = 16; private static final int DEFAULT_SPAWN_RANGE = 4; private int spawnDelay = 20; private WeightedList spawnPotentials = WeightedList.of(); @Nullable private SpawnData nextSpawnData; private double spin; private double oSpin; private int minSpawnDelay = 200; private int maxSpawnDelay = 800; private int spawnCount = 4; /** * Cached instance of the entity to render inside the spawner. */ @Nullable private Entity displayEntity; private int maxNearbyEntities = 6; private int requiredPlayerRange = 16; private int spawnRange = 4; public void setEntityId(EntityType type, @Nullable Level level, RandomSource random, BlockPos pos) { this.getOrCreateNextSpawnData(level, random, pos).getEntityToSpawn().putString("id", BuiltInRegistries.ENTITY_TYPE.getKey(type).toString()); } private boolean isNearPlayer(Level level, BlockPos pos) { return level.hasNearbyAlivePlayer(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5, this.requiredPlayerRange); } public void clientTick(Level level, BlockPos pos) { if (!this.isNearPlayer(level, pos)) { this.oSpin = this.spin; } else if (this.displayEntity != null) { RandomSource randomSource = level.getRandom(); double d = pos.getX() + randomSource.nextDouble(); double e = pos.getY() + randomSource.nextDouble(); double f = pos.getZ() + randomSource.nextDouble(); level.addParticle(ParticleTypes.SMOKE, d, e, f, 0.0, 0.0, 0.0); level.addParticle(ParticleTypes.FLAME, d, e, f, 0.0, 0.0, 0.0); if (this.spawnDelay > 0) { this.spawnDelay--; } this.oSpin = this.spin; this.spin = (this.spin + 1000.0F / (this.spawnDelay + 200.0F)) % 360.0; } } public void serverTick(ServerLevel serverLevel, BlockPos pos) { if (this.isNearPlayer(serverLevel, pos)) { if (this.spawnDelay == -1) { this.delay(serverLevel, pos); } if (this.spawnDelay > 0) { this.spawnDelay--; } else { boolean bl = false; RandomSource randomSource = serverLevel.getRandom(); SpawnData spawnData = this.getOrCreateNextSpawnData(serverLevel, randomSource, pos); for (int i = 0; i < this.spawnCount; i++) { CompoundTag compoundTag = spawnData.getEntityToSpawn(); Optional> optional = EntityType.by(compoundTag); if (optional.isEmpty()) { this.delay(serverLevel, pos); return; } Vec3 vec3 = (Vec3)compoundTag.read("Pos", Vec3.CODEC) .orElseGet( () -> new Vec3( pos.getX() + (randomSource.nextDouble() - randomSource.nextDouble()) * this.spawnRange + 0.5, pos.getY() + randomSource.nextInt(3) - 1, pos.getZ() + (randomSource.nextDouble() - randomSource.nextDouble()) * this.spawnRange + 0.5 ) ); if (serverLevel.noCollision(((EntityType)optional.get()).getSpawnAABB(vec3.x, vec3.y, vec3.z))) { BlockPos blockPos = BlockPos.containing(vec3); if (spawnData.getCustomSpawnRules().isPresent()) { if (!((EntityType)optional.get()).getCategory().isFriendly() && serverLevel.getDifficulty() == Difficulty.PEACEFUL) { continue; } SpawnData.CustomSpawnRules customSpawnRules = (SpawnData.CustomSpawnRules)spawnData.getCustomSpawnRules().get(); if (!customSpawnRules.isValidPosition(blockPos, serverLevel)) { continue; } } else if (!SpawnPlacements.checkSpawnRules((EntityType)optional.get(), serverLevel, EntitySpawnReason.SPAWNER, blockPos, serverLevel.getRandom())) { continue; } Entity entity = EntityType.loadEntityRecursive(compoundTag, serverLevel, EntitySpawnReason.SPAWNER, entityx -> { entityx.snapTo(vec3.x, vec3.y, vec3.z, entityx.getYRot(), entityx.getXRot()); return entityx; }); if (entity == null) { this.delay(serverLevel, pos); return; } int j = serverLevel.getEntities( EntityTypeTest.forExactClass(entity.getClass()), new AABB(pos.getX(), pos.getY(), pos.getZ(), pos.getX() + 1, pos.getY() + 1, pos.getZ() + 1).inflate(this.spawnRange), EntitySelector.NO_SPECTATORS ) .size(); if (j >= this.maxNearbyEntities) { this.delay(serverLevel, pos); return; } entity.snapTo(entity.getX(), entity.getY(), entity.getZ(), randomSource.nextFloat() * 360.0F, 0.0F); if (entity instanceof Mob mob) { if (spawnData.getCustomSpawnRules().isEmpty() && !mob.checkSpawnRules(serverLevel, EntitySpawnReason.SPAWNER) || !mob.checkSpawnObstruction(serverLevel) ) { continue; } boolean bl2 = spawnData.getEntityToSpawn().size() == 1 && spawnData.getEntityToSpawn().getString("id").isPresent(); if (bl2) { ((Mob)entity).finalizeSpawn(serverLevel, serverLevel.getCurrentDifficultyAt(entity.blockPosition()), EntitySpawnReason.SPAWNER, null); } spawnData.getEquipment().ifPresent(mob::equip); } if (!serverLevel.tryAddFreshEntityWithPassengers(entity)) { this.delay(serverLevel, pos); return; } serverLevel.levelEvent(2004, pos, 0); serverLevel.gameEvent(entity, GameEvent.ENTITY_PLACE, blockPos); if (entity instanceof Mob) { ((Mob)entity).spawnAnim(); } bl = true; } } if (bl) { this.delay(serverLevel, pos); } } } } private void delay(Level level, BlockPos pos) { RandomSource randomSource = level.random; if (this.maxSpawnDelay <= this.minSpawnDelay) { this.spawnDelay = this.minSpawnDelay; } else { this.spawnDelay = this.minSpawnDelay + randomSource.nextInt(this.maxSpawnDelay - this.minSpawnDelay); } this.spawnPotentials.getRandom(randomSource).ifPresent(spawnData -> this.setNextSpawnData(level, pos, spawnData)); this.broadcastEvent(level, pos, 1); } public void load(@Nullable Level level, BlockPos pos, CompoundTag tag) { this.spawnDelay = tag.getShortOr("Delay", (short)20); tag.read("SpawnData", SpawnData.CODEC).ifPresent(spawnData -> this.setNextSpawnData(level, pos, spawnData)); this.spawnPotentials = (WeightedList)tag.read("SpawnPotentials", SpawnData.LIST_CODEC) .orElseGet(() -> WeightedList.of(this.nextSpawnData != null ? this.nextSpawnData : new SpawnData())); this.minSpawnDelay = tag.getIntOr("MinSpawnDelay", 200); this.maxSpawnDelay = tag.getIntOr("MaxSpawnDelay", 800); this.spawnCount = tag.getIntOr("SpawnCount", 4); this.maxNearbyEntities = tag.getIntOr("MaxNearbyEntities", 6); this.requiredPlayerRange = tag.getIntOr("RequiredPlayerRange", 16); this.spawnRange = tag.getIntOr("SpawnRange", 4); this.displayEntity = null; } public CompoundTag save(CompoundTag tag) { tag.putShort("Delay", (short)this.spawnDelay); tag.putShort("MinSpawnDelay", (short)this.minSpawnDelay); tag.putShort("MaxSpawnDelay", (short)this.maxSpawnDelay); tag.putShort("SpawnCount", (short)this.spawnCount); tag.putShort("MaxNearbyEntities", (short)this.maxNearbyEntities); tag.putShort("RequiredPlayerRange", (short)this.requiredPlayerRange); tag.putShort("SpawnRange", (short)this.spawnRange); tag.storeNullable("SpawnData", SpawnData.CODEC, this.nextSpawnData); tag.store("SpawnPotentials", SpawnData.LIST_CODEC, this.spawnPotentials); return tag; } @Nullable public Entity getOrCreateDisplayEntity(Level level, BlockPos pos) { if (this.displayEntity == null) { CompoundTag compoundTag = this.getOrCreateNextSpawnData(level, level.getRandom(), pos).getEntityToSpawn(); if (compoundTag.getString("id").isEmpty()) { return null; } this.displayEntity = EntityType.loadEntityRecursive(compoundTag, level, EntitySpawnReason.SPAWNER, Function.identity()); if (compoundTag.size() == 1 && this.displayEntity instanceof Mob) { } } return this.displayEntity; } public boolean onEventTriggered(Level level, int id) { if (id == 1) { if (level.isClientSide) { this.spawnDelay = this.minSpawnDelay; } return true; } else { return false; } } protected void setNextSpawnData(@Nullable Level level, BlockPos pos, SpawnData nextSpawnData) { this.nextSpawnData = nextSpawnData; } private SpawnData getOrCreateNextSpawnData(@Nullable Level level, RandomSource random, BlockPos pos) { if (this.nextSpawnData != null) { return this.nextSpawnData; } else { this.setNextSpawnData(level, pos, (SpawnData)this.spawnPotentials.getRandom(random).orElseGet(SpawnData::new)); return this.nextSpawnData; } } public abstract void broadcastEvent(Level level, BlockPos pos, int eventId); public double getSpin() { return this.spin; } public double getoSpin() { return this.oSpin; } }