挪形换纹：双圈一踩，两头倒个

flowchart TD
A[点开阵] --> B[甲乙双环亮起]
B --> C[怪走上道]
C --> D{踩进环了吗}
D -- 踩了 --> E[瞬移到对面环]
E --> F[掉头重走]
F --> C
D -- 没踩 --> C
G[阵纹八秒黯淡] --> H[十秒后再开]

 fx-crest-portals

-- @file CrestPortals.lua
-- 挪形换纹 —— 双圈一踩 两头倒个

local CrestPortals = {}

local CONST = {
    PORTAL_A      = 420,
    PORTAL_B      = 210,
    TRIGGER_HALF  = 18,
    ARRAY_TIME    = 8,
    ARRAY_CD      = 10,

    AUTOINC_BASE  = 1207100,
}

local _on       = false
local _left     = 0
local _cd       = 0
local _autoInc  = 0

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

local function GenID()
    _autoInc = _autoInc + 1
    return CONST.AUTOINC_BASE + _autoInc
end

function CrestPortals.On() return _on end

-- 开阵: 双环亮起
function CrestPortals.Open()
    if _cd > 0 then
        ShowTip("阵纹还亮着——等它黯了再开")
        return
    end
    _cd = CONST.ARRAY_CD
    _on = true
    _left = CONST.ARRAY_TIME
    ShowTip("古阵开双环——它踩环就倒位!")
end

-- 每拍推进: 踩环对调 落点互斥
if not _ticker then
    _ticker = SL:Schedule(function(dt)
        if _cd > 0 then _cd = _cd - dt end
        if not _on then return end
        _left = _left - dt
        if _left <= 0 then
            _on = false
            ShowTip("阵纹黯了——十秒后再开")
            return
        end
        local mobX = SL:GetValue("mobX") or 0
        if math.abs(mobX - CONST.PORTAL_A) < CONST.TRIGGER_HALF then
            SL:SetValue("mobX", CONST.PORTAL_B)
            ShowTip("挪形换位!——掉头重走")
        elseif math.abs(mobX - CONST.PORTAL_B) < CONST.TRIGGER_HALF then
            SL:SetValue("mobX", CONST.PORTAL_A)
            ShowTip("挪形换位!——掉头重走")
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("开阵!", function()
        CrestPortals.Open()
    end)
    ShowTip("技能已加载: 挪形换纹")
end, 1.0)

function CrestPortals.Unload()
    if _ticker then SL:Unschedule(_ticker) end
    _on = false
end

return CrestPortals