扇骨剑纹：三道扇骨齐出，贴脸全吃

flowchart TD
A[点出鞘] --> B[三道扇骨齐发]
B --> C[上路剑气]
B --> D[中路剑气]
B --> E[下路剑气]
C --> F{怪接得住吗}
D --> F
E --> F
F -- 贴脸 --> G[三道全吃 三十]
F -- 离得远 --> H[只中一道 十]
G --> I[五秒后再出鞘]
H --> I

 fx-crest-fan

-- @file CrestFan.lua
-- 扇骨剑纹 —— 三道扇骨齐出 贴脸全吃

local CrestFan = {}

local CONST = {
    BONES         = 3,
    SPREAD        = 0.42,
    WAVE_LIFE     = 0.7,
    WAVE_REACH    = 320,
    WAVE_DMG      = 10,
    FAN_CD        = 5,

    AUTOINC_BASE  = 1204100,
}

local _waves    = {}
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 CrestFan.Waves() return #_waves end

-- 出鞘: 三道扇骨各带角度
function CrestFan.Unsheath()
    if _cd > 0 then
        ShowTip("剑气还没凝——再等" .. math.ceil(_cd) .. "秒")
        return
    end
    _cd = CONST.FAN_CD
    for i = 1, CONST.BONES do
        _waves[#_waves + 1] = {
            t = 0,
            ang = (i - 2) * CONST.SPREAD,
            hit = false,
        }
    end
    ShowTip("出鞘!三道扇骨——上中下各一道")
end

-- 每拍推进: 各飞各的 各结各的账
if not _ticker then
    _ticker = SL:Schedule(function(dt)
        if _cd > 0 then _cd = _cd - dt end
        for i = #_waves, 1, -1 do
            local w = _waves[i]
            w.t = w.t + dt
            local dist = w.t / CONST.WAVE_LIFE * CONST.WAVE_REACH
            if not w.hit and dist >= SL:GetValue("mobDist") then
                w.hit = true
                ShowTip("扇骨命中——" .. CONST.WAVE_DMG)
            end
            if w.t >= CONST.WAVE_LIFE then
                table.remove(_waves, i)
            end
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("出鞘!", function()
        CrestFan.Unsheath()
    end)
    ShowTip("技能已加载: 扇骨剑纹")
end, 1.0)

function CrestFan.Unload()
    if _ticker then SL:Unschedule(_ticker) end
    _waves = {}
end

return CrestFan