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

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.tags.BlockTags;
import net.minecraft.tags.FluidTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.InsideBlockEffectApplier;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.ScheduledTickAccess;
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.level.pathfinder.PathComputationType;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.VoxelShape;

public class CactusBlock extends Block {
    public static final MapCodec<CactusBlock> CODEC = simpleCodec(CactusBlock::new);
    public static final IntegerProperty AGE = BlockStateProperties.AGE_15;
    public static final int MAX_AGE = 15;
    private static final VoxelShape SHAPE = Block.column(14.0, 0.0, 16.0);
    private static final VoxelShape SHAPE_COLLISION = Block.column(14.0, 0.0, 15.0);
    private static final int MAX_CACTUS_GROWING_HEIGHT = 3;
    private static final int ATTEMPT_GROW_CACTUS_FLOWER_AGE = 8;
    private static final double ATTEMPT_GROW_CACTUS_FLOWER_SMALL_CACTUS_CHANCE = 0.1;
    private static final double ATTEMPT_GROW_CACTUS_FLOWER_TALL_CACTUS_CHANCE = 0.25;

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

    protected CactusBlock(BlockBehaviour.Properties p_51136_) {
        super(p_51136_);
        this.registerDefaultState(this.stateDefinition.any().setValue(AGE, 0));
    }

    @Override
    protected void tick(BlockState p_220908_, ServerLevel p_220909_, BlockPos p_220910_, RandomSource p_220911_) {
        if (!p_220908_.canSurvive(p_220909_, p_220910_)) {
            p_220909_.destroyBlock(p_220910_, true);
        }
    }

    @Override
    protected void randomTick(BlockState p_220913_, ServerLevel p_220914_, BlockPos p_220915_, RandomSource p_220916_) {
        BlockPos blockpos = p_220915_.above();
        if (p_220914_.isEmptyBlock(blockpos)) {
            int i = 1;
            int j = p_220913_.getValue(AGE);

            while (p_220914_.getBlockState(p_220915_.below(i)).is(this)) {
                if (++i == 3 && j == 15) {
                    return;
                }
            }

            if (j == 8 && this.canSurvive(this.defaultBlockState(), p_220914_, p_220915_.above())) {
                double d0 = i >= 3 ? 0.25 : 0.1;
                if (p_220916_.nextDouble() <= d0) {
                    p_220914_.setBlockAndUpdate(blockpos, Blocks.CACTUS_FLOWER.defaultBlockState());
                }
            } else if (j == 15 && i < 3) {
                p_220914_.setBlockAndUpdate(blockpos, this.defaultBlockState());
                BlockState blockstate = p_220913_.setValue(AGE, 0);
                p_220914_.setBlock(p_220915_, blockstate, 260);
                p_220914_.neighborChanged(blockstate, blockpos, this, null, false);
            }

            if (j < 15) {
                p_220914_.setBlock(p_220915_, p_220913_.setValue(AGE, j + 1), 260);
            }
        }
    }

    @Override
    protected VoxelShape getCollisionShape(BlockState p_51176_, BlockGetter p_51177_, BlockPos p_51178_, CollisionContext p_51179_) {
        return SHAPE_COLLISION;
    }

    @Override
    protected VoxelShape getShape(BlockState p_51171_, BlockGetter p_51172_, BlockPos p_51173_, CollisionContext p_51174_) {
        return SHAPE;
    }

    @Override
    protected BlockState updateShape(
        BlockState p_51157_,
        LevelReader p_368068_,
        ScheduledTickAccess p_362750_,
        BlockPos p_51161_,
        Direction p_51158_,
        BlockPos p_51162_,
        BlockState p_51159_,
        RandomSource p_362850_
    ) {
        if (!p_51157_.canSurvive(p_368068_, p_51161_)) {
            p_362750_.scheduleTick(p_51161_, this, 1);
        }

        return super.updateShape(p_51157_, p_368068_, p_362750_, p_51161_, p_51158_, p_51162_, p_51159_, p_362850_);
    }

    @Override
    protected boolean canSurvive(BlockState p_51153_, LevelReader p_51154_, BlockPos p_51155_) {
        for (Direction direction : Direction.Plane.HORIZONTAL) {
            BlockState blockstate = p_51154_.getBlockState(p_51155_.relative(direction));
            if (blockstate.isSolid() || p_51154_.getFluidState(p_51155_.relative(direction)).is(FluidTags.LAVA)) {
                return false;
            }
        }

        BlockState blockstate1 = p_51154_.getBlockState(p_51155_.below());
        return (blockstate1.is(Blocks.CACTUS) || blockstate1.is(BlockTags.SAND)) && !p_51154_.getBlockState(p_51155_.above()).liquid();
    }

    @Override
    protected void entityInside(BlockState p_51148_, Level p_51149_, BlockPos p_51150_, Entity p_51151_, InsideBlockEffectApplier p_393274_) {
        p_51151_.hurt(p_51149_.damageSources().cactus(), 1.0F);
    }

    @Override
    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> p_51164_) {
        p_51164_.add(AGE);
    }

    @Override
    protected boolean isPathfindable(BlockState p_51143_, PathComputationType p_51146_) {
        return false;
    }
}