Code/net/minecraft/world/entity/projectile/ThrowableProjectile.java

package net.minecraft.world.entity.projectile;

import net.minecraft.core.BlockPos;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.InsideBlockEffectApplier;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.phys.HitResult;
import net.minecraft.world.phys.Vec3;

public abstract class ThrowableProjectile extends Projectile {
    private static final float MIN_CAMERA_DISTANCE_SQUARED = 12.25F;

    protected ThrowableProjectile(EntityType<? extends ThrowableProjectile> p_37466_, Level p_37467_) {
        super(p_37466_, p_37467_);
    }

    protected ThrowableProjectile(EntityType<? extends ThrowableProjectile> p_37456_, double p_37457_, double p_37458_, double p_37459_, Level p_37460_) {
        this(p_37456_, p_37460_);
        this.setPos(p_37457_, p_37458_, p_37459_);
    }

    @Override
    public boolean shouldRenderAtSqrDistance(double p_37470_) {
        if (this.tickCount < 2 && p_37470_ < 12.25) {
            return false;
        } else {
            double d0 = this.getBoundingBox().getSize() * 4.0;
            if (Double.isNaN(d0)) {
                d0 = 4.0;
            }

            d0 *= 64.0;
            return p_37470_ < d0 * d0;
        }
    }

    @Override
    public boolean canUsePortal(boolean p_344784_) {
        return true;
    }

    @Override
    public void tick() {
        this.handleFirstTickBubbleColumn();
        this.applyGravity();
        this.applyInertia();
        HitResult hitresult = ProjectileUtil.getHitResultOnMoveVector(this, this::canHitEntity);
        Vec3 vec3;
        if (hitresult.getType() != HitResult.Type.MISS) {
            vec3 = hitresult.getLocation();
        } else {
            vec3 = this.position().add(this.getDeltaMovement());
        }

        this.setPos(vec3);
        this.updateRotation();
        this.applyEffectsFromBlocks();
        super.tick();
        if (hitresult.getType() != HitResult.Type.MISS && this.isAlive()) {
            this.hitTargetOrDeflectSelf(hitresult);
        }
    }

    private void applyInertia() {
        Vec3 vec3 = this.getDeltaMovement();
        Vec3 vec31 = this.position();
        float f;
        if (this.isInWater()) {
            for (int i = 0; i < 4; i++) {
                float f1 = 0.25F;
                this.level()
                    .addParticle(
                        ParticleTypes.BUBBLE,
                        vec31.x - vec3.x * 0.25,
                        vec31.y - vec3.y * 0.25,
                        vec31.z - vec3.z * 0.25,
                        vec3.x,
                        vec3.y,
                        vec3.z
                    );
            }

            f = 0.8F;
        } else {
            f = 0.99F;
        }

        this.setDeltaMovement(vec3.scale(f));
    }

    private void handleFirstTickBubbleColumn() {
        if (this.firstTick) {
            for (BlockPos blockpos : BlockPos.betweenClosed(this.getBoundingBox())) {
                BlockState blockstate = this.level().getBlockState(blockpos);
                if (blockstate.is(Blocks.BUBBLE_COLUMN)) {
                    blockstate.entityInside(this.level(), blockpos, this, InsideBlockEffectApplier.NOOP);
                }
            }
        }
    }

    @Override
    protected double getDefaultGravity() {
        return 0.03;
    }
}