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BusyRabbit/Content/Lua/GamePlay/Level/BusyLevelItemGenerator.lua
2025-07-09 01:08:35 +08:00

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---@class ItemGenerator 物品生成器类
local ItemGenerator = {
item_data = {},
period = 100,
item_distributions = {}
}
ItemGenerator.__index = ItemGenerator
---数组洗牌函数Fisher-Yates算法
---@param array any[] 需要打乱顺序的数组
local function ShuffleArray(array)
for i = #array, 2, -1 do -- 从后往前遍历
local j = math.random(i) -- 生成1到i的随机数
array[i], array[j] = array[j], array[i] -- 交换元素位置
end
end
---创建物品生成器实例
---@param period number 生成周期次数
---@param item_data table<number, number> 物品配置表 {物品ID = 总生成数量}
---@return ItemGenerator 物品生成器实例
local function CreateItemGenerator(period, item_data)
local self = setmetatable({}, ItemGenerator)
---@type number 存储生成周期
self.period = period
---@type table<number, number> 原始配置数据
self.item_data = item_data
---@type number 当前调用次数
self.current_call = 0
---@type table<number, number[]> 物品分布数据结构
self.item_distributions = {}
self:InitializeDistributions()
return self
end
---初始化物品分布数据
function ItemGenerator:InitializeDistributions()
-- 遍历所有物品配置
for item_id, total in pairs(self.item_data) do
-- 计算基础值和余数(保证总数 = 基础值*period + 余数)
local base = math.floor(total / self.period)
local remainder = total % self.period
-- 创建初始分布数组(全部填充基础值)
local distribution = {}
for i = 1, self.period do
distribution[i] = base
end
-- 生成索引数组并洗牌(用于随机分配余数)
local indices = {}
for i = 1, self.period do
indices[i] = i
end
ShuffleArray(indices) -- 打乱索引顺序
-- 将余数随机分配到前remainder个位置
for i = 1, remainder do
distribution[indices[i]] = distribution[indices[i]] + 1
end
-- 存储当前物品的分布数组
self.item_distributions[item_id] = distribution
end
end
---重置生成器状态当调用次数超过N时触发
function ItemGenerator:Reinitialize()
self:InitializeDistributions() -- 重新生成分布数据
self.current_call = 0 -- 重置调用计数器
end
---生成物品列表(每次调用产生一个周期的结果)
---@return number[] 包含物品ID的数组结果经过随机排序
function ItemGenerator:Generate()
-- 当超过周期次数时重置状态
if self.current_call >= self.period then
self:Reinitialize()
end
local current_step = self.current_call + 1 -- 获取当前步骤1-based
local result = {} -- 结果收集器
-- 遍历所有物品的分布数据
for item_id, distribution in pairs(self.item_distributions) do
local count = distribution[current_step] -- 获取当前步骤应生成数量
for _ = 1, count do
table.insert(result, item_id) -- 按数量添加物品ID到结果集
end
end
ShuffleArray(result) -- 打乱结果顺序保证随机性
self.current_call = self.current_call + 1 -- 增加调用计数器
return result
end
---获取当前未生成的物品剩余数量
---@return table<number, number> 返回物品ID和剩余数量的映射表
function ItemGenerator:GetRemainingItems()
local remaining = {}
local current_step = self.current_call -- 注意这里使用已调用次数0-based
-- 遍历所有物品的分布数据
for item_id, distribution in pairs(self.item_distributions) do
local total_remaining = 0
-- 计算从下一个步骤到周期结束的总数量
for step = current_step + 1, self.period do
total_remaining = total_remaining + distribution[step]
end
remaining[item_id] = total_remaining
end
return remaining
end
return CreateItemGenerator