踩金刀纹：刀落在金圈里，这一刀两倍沉

flowchart TD
A[点落刀] --> B[读摆锤位置]
B --> C{锤在金圈里}
C -- 在 --> D[完美 两倍沉]
C -- 不在 --> E[半价刀]
D --> F[金字连踩添一]
E --> G[连踩清零]
F --> H[等下一锤]
G --> H
H --> A

 fx-crest-rhythm

-- @file CrestRhythm.lua
-- 踩金刀纹 —— 刀落在金圈里 这一刀两倍沉

local CrestRhythm = {}

local CONST = {
    PERIOD        = 1.3,
    ZONE_HALF     = 0.14,
    DMG_PERFECT   = 28,
    DMG_BASE      = 14,

    AUTOINC_BASE  = 1200600,
}

local _phase    = 0
local _streak   = 0
local _best     = 0
local _lastGood = false
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

-- 每拍推摆锤: 相位在零到一之间往返
function CrestRhythm.Tick(dt)
    _phase = _phase + dt / CONST.PERIOD
    if _phase >= 1 then _phase = _phase - 1 end
end

function CrestRhythm.Phase() return _phase end
function CrestRhythm.Streak() return _streak end
function CrestRhythm.Best() return _best end

-- 落刀: 读相位定完美
function CrestRhythm.Strike()
    local p = _phase
    if p > 0.5 then p = 1 - p end
    _lastGood = p <= CONST.ZONE_HALF
    if _lastGood then
        _streak = _streak + 1
        if _streak > _best then _best = _streak end
        ShowTip("完美!两倍沉——连踩" .. _streak)
        return CONST.DMG_PERFECT
    end
    _streak = 0
    ShowTip("偏了半分——半价刀，连踩清零")
    return CONST.DMG_BASE
end

if not _ticker then
    _ticker = SL:Schedule(function(dt)
        CrestRhythm.Tick(dt)
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("落刀!", function()
        CrestRhythm.Strike()
    end)
    ShowTip("技能已加载: 踩金刀纹")
end, 1.0)

function CrestRhythm.Unload()
    if _ticker then SL:Unschedule(_ticker) end
    _phase = 0
    _streak = 0
end

return CrestRhythm