import cn.nukkit.utils.BlockIterator; //导入依赖的package包/类
public Block[] getLineOfSight(int maxDistance, int maxLength, Integer[] transparent) {
    if (maxDistance > 120) {
        maxDistance = 120;
    }

    if (transparent != null && transparent.length == 0) {
        transparent = null;
    }

    List<Block> blocks = new ArrayList<>();

    BlockIterator itr = new BlockIterator(this.level, this.getPosition(), this.getDirectionVector(), this.getEyeHeight(), maxDistance);

    while (itr.hasNext()) {
        Block block = itr.next();
        blocks.add(block);

        if (maxLength != 0 && blocks.size() > maxLength) {
            blocks.remove(0);
        }

        int id = block.getId();

        if (transparent == null) {
            if (id != 0) {
                break;
            }
        } else {
            if (Arrays.binarySearch(transparent, id) < 0) {
                break;
            }
        }
    }

    return blocks.stream().toArray(Block[]::new);
}
 

import cn.nukkit.utils.BlockIterator; //导入依赖的package包/类
/**
 * Returns the Entity the player is looking at currently
 *
 * @param maxDistance the maximum distance to check for entities
 * @return Entity|null    either NULL if no entity is found or an instance of the entity
 */
public EntityInteractable getEntityPlayerLookingAt(int maxDistance) {
    timing.startTiming();

    EntityInteractable entity = null;

    // just a fix because player MAY not be fully initialized
    if (temporalVector != null) {
        Entity[] nearbyEntities = level.getNearbyEntities(boundingBox.grow(maxDistance, maxDistance, maxDistance), this);

        // get all blocks in looking direction until the max interact distance is reached (it's possible that startblock isn't found!)
        try {
            BlockIterator itr = new BlockIterator(level, getPosition(), getDirectionVector(), getEyeHeight(), maxDistance);
            if (itr.hasNext()) {
                Block block;
                while (itr.hasNext()) {
                    block = itr.next();
                    entity = getEntityAtPosition(nearbyEntities, block.getFloorX(), block.getFloorY(), block.getFloorZ());
                    if (entity != null) {
                        break;
                    }
                }
            }
        } catch (Exception ex) {
            // nothing to log here!
        }
    }

    timing.stopTiming();

    return entity;
}
 

import cn.nukkit.utils.BlockIterator; //导入依赖的package包/类
public Block[] getLineOfSight(int maxDistance, int maxLength, Map<Integer, Object> transparent) {
    if (maxDistance > 120) {
        maxDistance = 120;
    }

    if (transparent != null && transparent.isEmpty()) {
        transparent = null;
    }

    List<Block> blocks = new ArrayList<>();

    BlockIterator itr = new BlockIterator(this.level, this.getPosition(), this.getDirectionVector(), this.getEyeHeight(), maxDistance);

    while (itr.hasNext()) {
        Block block = itr.next();
        blocks.add(block);

        if (maxLength != 0 && blocks.size() > maxLength) {
            blocks.remove(0);
        }

        int id = block.getId();

        if (transparent == null) {
            if (id != 0) {
                break;
            }
        } else {
            if (!transparent.containsKey(id)) {
                break;
            }
        }
    }

    return blocks.stream().toArray(Block[]::new);
}