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