双蛟出纹：两条水蛟绞着游，游到缠一身

flowchart TD
A[点放蛟] --> B[蓝蛟出水]
A2[同时] --> C[绿蛟反相出水]
B --> D[两蛟绞游并行]
C --> D
D --> E{游到怪身前了吗}
E -- 没有 --> D
E -- 到了 --> F[双头齐咬 十八]
F --> G[缠身慢一拍]
G --> H[六秒后再放]

 fx-crest-twinsnake

-- @file CrestTwinsnake.lua
-- 双蛟出纹 —— 两条水蛟绞着游 游到缠一身

local CrestTwinsnake = {}

local CONST = {
    SWIM_TIME     = 1,
    BITE_DMG      = 9,
    SNAKE_AMP     = 20,
    SNAKE_WAVE    = 12.56,
    BIND_TIME     = 1,
    SWIM_CD       = 6,

    AUTOINC_BASE  = 1206400,
}

local _swimming = false
local _t        = 0
local _trails   = { {}, {} }
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 CrestTwinsnake.Swimming() return _swimming end

-- 放蛟: 双蛟反相出水
function CrestTwinsnake.Release()
    if _cd > 0 then
        ShowTip("水蛟还没游回来——再等" .. math.ceil(_cd) .. "秒")
        return
    end
    _cd = CONST.SWIM_CD
    _swimming = true
    _t = 0
    _trails = { {}, {} }
    ShowTip("双蛟出水——绞着游过去")
end

-- 每拍推进: 同路反相 到位双咬
if not _ticker then
    _ticker = SL:Schedule(function(dt)
        if _cd > 0 then _cd = _cd - dt end
        if not _swimming then return end
        _t = _t + dt
        local k = math.min(1, _t / CONST.SWIM_TIME)
        for s = 1, 2 do
            local sx = 230 + (SL:GetValue("mobX") or 520 - 230) * k
            local sy = 172 + math.sin(k * CONST.SNAKE_WAVE
                + (s - 1) * 3.14) * CONST.SNAKE_AMP * (1 - k * 0.4)
            _trails[s][#_trails[s] + 1] = { x = sx, y = sy }
            if #_trails[s] > 16 then table.remove(_trails[s], 1) end
        end
        if k >= 1 then
            _swimming = false
            ShowTip("双蛟绞身——十八入账,缠它一拍")
            SL:SetValue("mobDelay", CONST.BIND_TIME)
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("放蛟!", function()
        CrestTwinsnake.Release()
    end)
    ShowTip("技能已加载: 双蛟出纹")
end, 1.0)

function CrestTwinsnake.Unload()
    if _ticker then SL:Unschedule(_ticker) end
    _swimming = false
    _trails = { {}, {} }
end

return CrestTwinsnake