虚空步：消失后出现在它身后

 fx-voidstep

-- @file VoidStep.lua
-- 虚空步 —— 消失后出现在它身后

local VoidStep = {}

local CONST = {
    STEP_DIST     = 60,
    STEP_CD       = 5.0,
    BACKSTAB_DMG  = 20,

    COLOR_VOID    = "#6878c8",
    COLOR_DEEP    = "#1a1a52",
    COLOR_GHOST   = "#c8d0f4",

    ZORDER_VOID   = 134,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1069000,
}

local _cdLeft    = 0
local _scheduler = nil
local _autoInc   = 0

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

function VoidStep.Step()
    if _cdLeft > 0 then
        ShowTip("虚空冷却——" .. string.format("%.1f", _cdLeft) .. "秒")
        return
    end
    _cdLeft = CONST.STEP_CD
    local myID = SL:GetValue("USER_ID")
    local tid = SL:GetValue("MARK_TARGET_ID")
    local mp = GetActorPos(myID)
    local tp = GetActorPos(tid)
    if not mp or not tp then return end
    local side = mp.x < tp.x and -1 or 1
    SL:SetActorPos(myID, tp.x + side * CONST.STEP_DIST, tp.y)
    SL:PlayVoidStepFx(mp.x, mp.y, tp.x + side * CONST.STEP_DIST, tp.y)
    SL:TipAboveMe("虚空步")
    ShowTip("虚空一步——出现在它身后")
end

-- 背刺结算：虚空步后的第一刀翻倍
SL:RegisterLUAEvent(LUA_EVENT_MELEE_HIT, "VDS_Back", function(tid)
    if _backstab then
        _backstab = false
        return CONST.BACKSTAB_DMG
            - (SL:GetValue("HIT_DAMAGE", tid) or 10)
    end
    return 0
end)

-- 定时器：冷却推进
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("虚空步", function()
        VoidStep.Step()
    end)
    ShowTip("技能已加载: 虚空步 (调试按钮触发)")
end, 1.0)

function VoidStep.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    _cdLeft = 0
    _backstab = false
end

return VoidStep