Code/net/minecraft/world/level/block/TargetBlock.java

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import net.minecraft.advancements.CriteriaTriggers;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.stats.Stats;
import net.minecraft.util.Mth;
import net.minecraft.util.RandomSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.projectile.AbstractArrow;
import net.minecraft.world.entity.projectile.Projectile;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelAccessor;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.StateDefinition;
import net.minecraft.world.level.block.state.properties.BlockStateProperties;
import net.minecraft.world.level.block.state.properties.IntegerProperty;
import net.minecraft.world.phys.BlockHitResult;
import net.minecraft.world.phys.Vec3;

public class TargetBlock extends Block {
    public static final MapCodec<TargetBlock> CODEC = simpleCodec(TargetBlock::new);
    private static final IntegerProperty OUTPUT_POWER = BlockStateProperties.POWER;
    private static final int ACTIVATION_TICKS_ARROWS = 20;
    private static final int ACTIVATION_TICKS_OTHER = 8;

    @Override
    public MapCodec<TargetBlock> codec() {
        return CODEC;
    }

    public TargetBlock(BlockBehaviour.Properties p_57379_) {
        super(p_57379_);
        this.registerDefaultState(this.stateDefinition.any().setValue(OUTPUT_POWER, 0));
    }

    @Override
    protected void onProjectileHit(Level p_57381_, BlockState p_57382_, BlockHitResult p_57383_, Projectile p_57384_) {
        int i = updateRedstoneOutput(p_57381_, p_57382_, p_57383_, p_57384_);
        if (p_57384_.getOwner() instanceof ServerPlayer serverplayer) {
            serverplayer.awardStat(Stats.TARGET_HIT);
            CriteriaTriggers.TARGET_BLOCK_HIT.trigger(serverplayer, p_57384_, p_57383_.getLocation(), i);
        }
    }

    private static int updateRedstoneOutput(LevelAccessor p_57392_, BlockState p_57393_, BlockHitResult p_57394_, Entity p_57395_) {
        int i = getRedstoneStrength(p_57394_, p_57394_.getLocation());
        int j = p_57395_ instanceof AbstractArrow ? 20 : 8;
        if (!p_57392_.getBlockTicks().hasScheduledTick(p_57394_.getBlockPos(), p_57393_.getBlock())) {
            setOutputPower(p_57392_, p_57393_, i, p_57394_.getBlockPos(), j);
        }

        return i;
    }

    private static int getRedstoneStrength(BlockHitResult p_57409_, Vec3 p_57410_) {
        Direction direction = p_57409_.getDirection();
        double d0 = Math.abs(Mth.frac(p_57410_.x) - 0.5);
        double d1 = Math.abs(Mth.frac(p_57410_.y) - 0.5);
        double d2 = Math.abs(Mth.frac(p_57410_.z) - 0.5);
        Direction.Axis direction$axis = direction.getAxis();
        double d3;
        if (direction$axis == Direction.Axis.Y) {
            d3 = Math.max(d0, d2);
        } else if (direction$axis == Direction.Axis.Z) {
            d3 = Math.max(d0, d1);
        } else {
            d3 = Math.max(d1, d2);
        }

        return Math.max(1, Mth.ceil(15.0 * Mth.clamp((0.5 - d3) / 0.5, 0.0, 1.0)));
    }

    private static void setOutputPower(LevelAccessor p_57386_, BlockState p_57387_, int p_57388_, BlockPos p_57389_, int p_57390_) {
        p_57386_.setBlock(p_57389_, p_57387_.setValue(OUTPUT_POWER, p_57388_), 3);
        p_57386_.scheduleTick(p_57389_, p_57387_.getBlock(), p_57390_);
    }

    @Override
    protected void tick(BlockState p_222588_, ServerLevel p_222589_, BlockPos p_222590_, RandomSource p_222591_) {
        if (p_222588_.getValue(OUTPUT_POWER) != 0) {
            p_222589_.setBlock(p_222590_, p_222588_.setValue(OUTPUT_POWER, 0), 3);
        }
    }

    @Override
    protected int getSignal(BlockState p_57402_, BlockGetter p_57403_, BlockPos p_57404_, Direction p_57405_) {
        return p_57402_.getValue(OUTPUT_POWER);
    }

    @Override
    protected boolean isSignalSource(BlockState p_57418_) {
        return true;
    }

    @Override
    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> p_57407_) {
        p_57407_.add(OUTPUT_POWER);
    }

    @Override
    protected void onPlace(BlockState p_57412_, Level p_57413_, BlockPos p_57414_, BlockState p_57415_, boolean p_57416_) {
        if (!p_57413_.isClientSide() && !p_57412_.is(p_57415_.getBlock())) {
            if (p_57412_.getValue(OUTPUT_POWER) > 0 && !p_57413_.getBlockTicks().hasScheduledTick(p_57414_, this)) {
                p_57413_.setBlock(p_57414_, p_57412_.setValue(OUTPUT_POWER, 0), 18);
            }
        }
    }
}