滚石压纹：石碾子滚过去，压头不压脚

flowchart TD
A[点滚石] --> B[石碾下坡]
B --> C{碾过怪身了吗}
C -- 没有 --> C
C -- 碾过 --> D[二十四入账]
D --> E[顶退四十步]
E --> F{推出地皮了吗}
F -- 封顶止步 --> G[碾过 七秒再滚]
F -- 还有余地 --> G

-- @file CrestRollstone.lua
-- 滚石压纹 —— 石碾子滚过去 压头不压脚

local CrestRollstone = {}

local CONST = {
    SPEED         = 330,
    ROLL_DMG      = 24,
    PUSH_DIST     = 40,
    PUSH_LINE     = 720,
    STUN_TIME     = 0.8,
    ROLL_CD       = 7,

    AUTOINC_BASE  = 1206000,
}

local _rolling  = false
local _x        = 0
local _hit      = false
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 CrestRollstone.Rolling() return _rolling end

-- 放碾: 从坡顶出发
function CrestRollstone.Release()
    if _cd > 0 then
        ShowTip("坡上没石头了——再等" .. math.ceil(_cd) .. "秒")
        return
    end
    _cd = CONST.ROLL_CD
    _rolling = true
    _x = -40
    _hit = false
    ShowTip("石碾下坡——低头看路,抬头看它")
end

-- 每拍推进: 碾身结账 顶退封顶
if not _ticker then
    _ticker = SL:Schedule(function(dt)
        if _cd > 0 then _cd = _cd - dt end
        if not _rolling then return end
        _x = _x + CONST.SPEED * dt
        if not _hit
            and math.abs((SL:GetValue("mobX") or 0) - _x) < 30 then
            _hit = true
            ShowTip("碾过头身——" .. CONST.ROLL_DMG)
            SL:SetValue("mobPush", CONST.PUSH_DIST)
            SL:SetValue("mobDelay", CONST.STUN_TIME)
        end
        if _x > 800 then _rolling = false end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("滚石!", function()
        CrestRollstone.Release()
    end)
    ShowTip("技能已加载: 滚石压纹")
end, 1.0)

function CrestRollstone.Unload()
    if _ticker then SL:Unschedule(_ticker) end
    _rolling = false
end

return CrestRollstone