涡流井纹：漩涡一开，拖着它打转

flowchart TD
A[点开涡] --> B[半道翻开涡眼]
B --> C[拖身向涡心]
C --> D{贴着涡了吗}
D -- 贴着 --> E[每半秒蚀三]
D -- 还没 --> C
E --> F{涡转满四秒了吗}
F -- 没有 --> C
F -- 满了 --> G[涡散 怪停涡心旁]
G --> H[十秒后再开]

 fx-crest-vortex

-- @file CrestVortex.lua
-- 涡流井纹 —— 漩涡一开 拖着它打转

local CrestVortex = {}

local CONST = {
    VORTEX_TIME   = 4,
    VORTEX_X      = 380,
    PULL_SPEED    = 55,
    STOP_GAP      = 10,
    TICK_DMG      = 3,
    TICK_TIME     = 0.5,
    VORTEX_CD     = 10,

    AUTOINC_BASE  = 1205500,
}

local _on       = false
local _t        = 0
local _tick     = 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 CrestVortex.On() return _on end
function CrestVortex.Pos() return CONST.VORTEX_X end

-- 开涡
function CrestVortex.Open()
    if _cd > 0 then
        ShowTip("海眼还没翻涌——再等" .. math.ceil(_cd) .. "秒")
        return
    end
    _cd = CONST.VORTEX_CD
    _on = true
    _t = CONST.VORTEX_TIME
    _tick = 0
    ShowTip("涡眼开了——拖着它打转")
end

-- 每拍推进: 拖身向心 止点一行 贴涡即蚀
if not _ticker then
    _ticker = SL:Schedule(function(dt)
        if _cd > 0 then _cd = _cd - dt end
        if not _on then return end
        _t = _t - dt
        local mobX = SL:GetValue("mobX") or 0
        if mobX > CONST.VORTEX_X + CONST.STOP_GAP then
            SL:SetValue("mobX", mobX - CONST.PULL_SPEED * dt)
        end
        _tick = _tick - dt
        if _tick <= 0
            and math.abs(mobX - CONST.VORTEX_X) < 46 then
            _tick = CONST.TICK_TIME
            ShowTip("贴涡蚀" .. CONST.TICK_DMG)
        end
        if _t <= 0 then
            _on = false
            ShowTip("涡眼散了——十秒后再开")
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("开涡!", function()
        CrestVortex.Open()
    end)
    ShowTip("技能已加载: 涡流井纹")
end, 1.0)

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

return CrestVortex