错拍：踩着它的拍子递刀，拍上十六

 fx-offbeatcut

-- @file OffbeatCut.lua
-- 错拍 —— 踩着它的拍子递刀，拍上十六

local OffbeatCut = {}

local CONST = {
    BEAT_CYCLE    = 1.6,
    GAP_START     = 0.7,
    GAP_END       = 1.4,
    GAP_DMG       = 16,
    ONBEAT_DMG    = 8,

    COLOR_CUT     = "#58885a",
    COLOR_DEEP    = "#1e3a20",
    COLOR_GHOST   = "#c8ecd0",

    ZORDER_BEAT   = 130,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1045000,
}

local _cycleT    = 0
local _scheduler = nil
local _autoInc   = 0

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "OBC",
        CONST.AUTOINC_BASE + _autoInc)
end

local function GetActorPos(id)
    if not id then return nil end
    local x = SL:GetValue("ACTOR_POSITION_X", id)
    local y = SL:GetValue("ACTOR_POSITION_Y", id)
    if not x or not y then return nil end
    return { x = x, y = y }
end

local function ShowTip(msg)
    if msg and msg ~= "" then SL:ShowSystemTips(msg) end
end

local function InGap()
    local p = _cycleT % CONST.BEAT_CYCLE
    return p >= CONST.GAP_START and p <= CONST.GAP_END
end

local function DeliverCut(tid)
    local inGap = InGap()
    local dmg = inGap and CONST.GAP_DMG or CONST.ONBEAT_DMG
    SL:ActorHurt(tid, dmg)
    SL:TipAbove(tid, "-" .. dmg)
    if inGap then
        SL:PlayGapCutFx(tid)
        ShowTip("拍上递刀——十六点入账")
    else
        ShowTip("打在拍子上——八点白给，等空当")
    end
end

-- 递刀入口
function OffbeatCut.Swing()
    local tid = SL:GetValue("MARK_TARGET_ID")
    if not tid or SL:GetValue("ACTOR_DEAD", tid) then return end
    DeliverCut(tid)
    if SL:GetValue("ACTOR_DEAD", tid) then
        ShowTip("它倒了——被数着拍子的刀放倒的")
    end
end

-- 定时器：拍子循环与出手拍演出
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cycleT = _cycleT + dt
        local p = _cycleT % CONST.BEAT_CYCLE
        local prev = (_cycleT - dt) % CONST.BEAT_CYCLE
        if prev < CONST.GAP_START and p >= CONST.GAP_START then
            SL:PlayFoeSwingFx(SL:GetValue("MARK_TARGET_ID"))
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("进刀", function()
        OffbeatCut.Swing()
    end)
    ShowTip("技能已加载: 错拍 (调试按钮触发)")
end, 1.0)

function OffbeatCut.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    _cycleT = 0
end

return OffbeatCut