Code/net/minecraft/world/entity/animal/Squid.java

package net.minecraft.world.entity.animal;

import java.util.Objects;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.core.particles.ParticleOptions;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.tags.FluidTags;
import net.minecraft.util.Mth;
import net.minecraft.world.DifficultyInstance;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.effect.MobEffects;
import net.minecraft.world.entity.AgeableMob;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.Mob;
import net.minecraft.world.entity.MoverType;
import net.minecraft.world.entity.SpawnGroupData;
import net.minecraft.world.entity.ai.attributes.AttributeSupplier;
import net.minecraft.world.entity.ai.attributes.Attributes;
import net.minecraft.world.entity.ai.goal.Goal;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.ServerLevelAccessor;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.phys.Vec3;

public class Squid extends AgeableWaterCreature {
    public float xBodyRot;
    public float xBodyRotO;
    public float zBodyRot;
    public float zBodyRotO;
    public float tentacleMovement;
    public float oldTentacleMovement;
    public float tentacleAngle;
    public float oldTentacleAngle;
    private float speed;
    private float tentacleSpeed;
    private float rotateSpeed;
    Vec3 movementVector = Vec3.ZERO;

    public Squid(EntityType<? extends Squid> p_29953_, Level p_29954_) {
        super(p_29953_, p_29954_);
        this.random.setSeed(this.getId());
        this.tentacleSpeed = 1.0F / (this.random.nextFloat() + 1.0F) * 0.2F;
    }

    @Override
    protected void registerGoals() {
        this.goalSelector.addGoal(0, new Squid.SquidRandomMovementGoal(this));
        this.goalSelector.addGoal(1, new Squid.SquidFleeGoal());
    }

    public static AttributeSupplier.Builder createAttributes() {
        return Mob.createMobAttributes().add(Attributes.MAX_HEALTH, 10.0);
    }

    @Override
    protected SoundEvent getAmbientSound() {
        return SoundEvents.SQUID_AMBIENT;
    }

    @Override
    protected SoundEvent getHurtSound(DamageSource p_29980_) {
        return SoundEvents.SQUID_HURT;
    }

    @Override
    protected SoundEvent getDeathSound() {
        return SoundEvents.SQUID_DEATH;
    }

    protected SoundEvent getSquirtSound() {
        return SoundEvents.SQUID_SQUIRT;
    }

    @Override
    public boolean canBeLeashed() {
        return true;
    }

    @Override
    protected float getSoundVolume() {
        return 0.4F;
    }

    @Override
    protected Entity.MovementEmission getMovementEmission() {
        return Entity.MovementEmission.EVENTS;
    }

    @Nullable
    @Override
    public AgeableMob getBreedOffspring(ServerLevel p_364166_, AgeableMob p_369721_) {
        return EntityType.SQUID.create(p_364166_, EntitySpawnReason.BREEDING);
    }

    @Override
    protected double getDefaultGravity() {
        return 0.08;
    }

    @Override
    public void aiStep() {
        super.aiStep();
        this.xBodyRotO = this.xBodyRot;
        this.zBodyRotO = this.zBodyRot;
        this.oldTentacleMovement = this.tentacleMovement;
        this.oldTentacleAngle = this.tentacleAngle;
        this.tentacleMovement = this.tentacleMovement + this.tentacleSpeed;
        if (this.tentacleMovement > Math.PI * 2) {
            if (this.level().isClientSide) {
                this.tentacleMovement = (float) (Math.PI * 2);
            } else {
                this.tentacleMovement -= (float) (Math.PI * 2);
                if (this.random.nextInt(10) == 0) {
                    this.tentacleSpeed = 1.0F / (this.random.nextFloat() + 1.0F) * 0.2F;
                }

                this.level().broadcastEntityEvent(this, (byte)19);
            }
        }

        if (this.isInWater()) {
            if (this.tentacleMovement < (float) Math.PI) {
                float f = this.tentacleMovement / (float) Math.PI;
                this.tentacleAngle = Mth.sin(f * f * (float) Math.PI) * (float) Math.PI * 0.25F;
                if (f > 0.75) {
                    if (this.isLocalInstanceAuthoritative()) {
                        this.setDeltaMovement(this.movementVector);
                    }

                    this.rotateSpeed = 1.0F;
                } else {
                    this.rotateSpeed *= 0.8F;
                }
            } else {
                this.tentacleAngle = 0.0F;
                if (this.isLocalInstanceAuthoritative()) {
                    this.setDeltaMovement(this.getDeltaMovement().scale(0.9));
                }

                this.rotateSpeed *= 0.99F;
            }

            Vec3 vec3 = this.getDeltaMovement();
            double d0 = vec3.horizontalDistance();
            this.yBodyRot = this.yBodyRot + (-((float)Mth.atan2(vec3.x, vec3.z)) * (180.0F / (float)Math.PI) - this.yBodyRot) * 0.1F;
            this.setYRot(this.yBodyRot);
            this.zBodyRot = this.zBodyRot + (float) Math.PI * this.rotateSpeed * 1.5F;
            this.xBodyRot = this.xBodyRot + (-((float)Mth.atan2(d0, vec3.y)) * (180.0F / (float)Math.PI) - this.xBodyRot) * 0.1F;
        } else {
            this.tentacleAngle = Mth.abs(Mth.sin(this.tentacleMovement)) * (float) Math.PI * 0.25F;
            if (!this.level().isClientSide) {
                double d1 = this.getDeltaMovement().y;
                if (this.hasEffect(MobEffects.LEVITATION)) {
                    d1 = 0.05 * (this.getEffect(MobEffects.LEVITATION).getAmplifier() + 1);
                } else {
                    d1 -= this.getGravity();
                }

                this.setDeltaMovement(0.0, d1 * 0.98F, 0.0);
            }

            this.xBodyRot = this.xBodyRot + (-90.0F - this.xBodyRot) * 0.02F;
        }
    }

    @Override
    public boolean hurtServer(ServerLevel p_363133_, DamageSource p_368481_, float p_368903_) {
        if (super.hurtServer(p_363133_, p_368481_, p_368903_) && this.getLastHurtByMob() != null) {
            this.spawnInk();
            return true;
        } else {
            return false;
        }
    }

    private Vec3 rotateVector(Vec3 p_29986_) {
        Vec3 vec3 = p_29986_.xRot(this.xBodyRotO * (float) (Math.PI / 180.0));
        return vec3.yRot(-this.yBodyRotO * (float) (Math.PI / 180.0));
    }

    private void spawnInk() {
        this.makeSound(this.getSquirtSound());
        Vec3 vec3 = this.rotateVector(new Vec3(0.0, -1.0, 0.0)).add(this.getX(), this.getY(), this.getZ());

        for (int i = 0; i < 30; i++) {
            Vec3 vec31 = this.rotateVector(new Vec3(this.random.nextFloat() * 0.6 - 0.3, -1.0, this.random.nextFloat() * 0.6 - 0.3));
            float f = this.isBaby() ? 0.1F : 0.3F;
            Vec3 vec32 = vec31.scale(f + this.random.nextFloat() * 2.0F);
            ((ServerLevel)this.level())
                .sendParticles(this.getInkParticle(), vec3.x, vec3.y + 0.5, vec3.z, 0, vec32.x, vec32.y, vec32.z, 0.1F);
        }
    }

    protected ParticleOptions getInkParticle() {
        return ParticleTypes.SQUID_INK;
    }

    @Override
    public void travel(Vec3 p_29984_) {
        this.move(MoverType.SELF, this.getDeltaMovement());
    }

    @Override
    public void handleEntityEvent(byte p_29957_) {
        if (p_29957_ == 19) {
            this.tentacleMovement = 0.0F;
        } else {
            super.handleEntityEvent(p_29957_);
        }
    }

    public boolean hasMovementVector() {
        return this.movementVector.lengthSqr() > 1.0E-5F;
    }

    @Nullable
    @Override
    public SpawnGroupData finalizeSpawn(ServerLevelAccessor p_369956_, DifficultyInstance p_366369_, EntitySpawnReason p_366851_, @Nullable SpawnGroupData p_369197_) {
        SpawnGroupData spawngroupdata = Objects.requireNonNullElseGet(p_369197_, () -> new AgeableMob.AgeableMobGroupData(0.05F));
        return super.finalizeSpawn(p_369956_, p_366369_, p_366851_, spawngroupdata);
    }

    class SquidFleeGoal extends Goal {
        private static final float SQUID_FLEE_SPEED = 3.0F;
        private static final float SQUID_FLEE_MIN_DISTANCE = 5.0F;
        private static final float SQUID_FLEE_MAX_DISTANCE = 10.0F;
        private int fleeTicks;

        @Override
        public boolean canUse() {
            LivingEntity livingentity = Squid.this.getLastHurtByMob();
            return Squid.this.isInWater() && livingentity != null ? Squid.this.distanceToSqr(livingentity) < 100.0 : false;
        }

        @Override
        public void start() {
            this.fleeTicks = 0;
        }

        @Override
        public boolean requiresUpdateEveryTick() {
            return true;
        }

        @Override
        public void tick() {
            this.fleeTicks++;
            LivingEntity livingentity = Squid.this.getLastHurtByMob();
            if (livingentity != null) {
                Vec3 vec3 = new Vec3(
                    Squid.this.getX() - livingentity.getX(),
                    Squid.this.getY() - livingentity.getY(),
                    Squid.this.getZ() - livingentity.getZ()
                );
                BlockState blockstate = Squid.this.level()
                    .getBlockState(
                        BlockPos.containing(Squid.this.getX() + vec3.x, Squid.this.getY() + vec3.y, Squid.this.getZ() + vec3.z)
                    );
                FluidState fluidstate = Squid.this.level()
                    .getFluidState(
                        BlockPos.containing(Squid.this.getX() + vec3.x, Squid.this.getY() + vec3.y, Squid.this.getZ() + vec3.z)
                    );
                if (fluidstate.is(FluidTags.WATER) || blockstate.isAir()) {
                    double d0 = vec3.length();
                    if (d0 > 0.0) {
                        vec3.normalize();
                        double d1 = 3.0;
                        if (d0 > 5.0) {
                            d1 -= (d0 - 5.0) / 5.0;
                        }

                        if (d1 > 0.0) {
                            vec3 = vec3.scale(d1);
                        }
                    }

                    if (blockstate.isAir()) {
                        vec3 = vec3.subtract(0.0, vec3.y, 0.0);
                    }

                    Squid.this.movementVector = new Vec3(vec3.x / 20.0, vec3.y / 20.0, vec3.z / 20.0);
                }

                if (this.fleeTicks % 10 == 5) {
                    Squid.this.level().addParticle(ParticleTypes.BUBBLE, Squid.this.getX(), Squid.this.getY(), Squid.this.getZ(), 0.0, 0.0, 0.0);
                }
            }
        }
    }

    static class SquidRandomMovementGoal extends Goal {
        private final Squid squid;

        public SquidRandomMovementGoal(Squid p_30003_) {
            this.squid = p_30003_;
        }

        @Override
        public boolean canUse() {
            return true;
        }

        @Override
        public void tick() {
            int i = this.squid.getNoActionTime();
            if (i > 100) {
                this.squid.movementVector = Vec3.ZERO;
            } else if (this.squid.getRandom().nextInt(reducedTickDelay(50)) == 0 || !this.squid.wasTouchingWater || !this.squid.hasMovementVector()) {
                float f = this.squid.getRandom().nextFloat() * (float) (Math.PI * 2);
                this.squid.movementVector = new Vec3(Mth.cos(f) * 0.2F, -0.1F + this.squid.getRandom().nextFloat() * 0.2F, Mth.sin(f) * 0.2F);
            }
        }
    }
}