禁足：一钉钉住它的脚，四秒里哪儿也去不了

 fx-noground

-- @file NoGround.lua
-- 禁足 —— 一钉钉住它的脚，四秒里哪儿也去不了

local NoGround = {}

local CONST = {
    ROOT_LIFE     = 4.0,
    ROOT_CD       = 6.0,

    COLOR_NAIL    = "#8a9a5a",
    COLOR_DEEP    = "#3a4418",
    COLOR_GHOST   = "#d8e8b0",

    ZORDER_NAIL   = 130,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 994000,
}

local _rootT     = 0
local _rootID    = 0
local _cdLeft    = 0
local _nailFx    = nil
local _scheduler = nil
local _autoInc   = 0

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "NGD",
        CONST.AUTOINC_BASE + _autoInc)
end

local function GetActorPos(id)
    if not id then return nil end
    local x = SL:GetValue("ACTOR_POSITION_X", id)
    local y = SL:GetValue("ACTOR_POSITION_Y", id)
    if not x or not y then return nil end
    return { x = x, y = y }
end

local function SafeRemove(node)
    if node and not GUI:Widget_IsNull(node) then
        GUI:removeFromParent(node)
    end
end

local function ShowTip(msg)
    if msg and msg ~= "" then SL:ShowSystemTips(msg) end
end

local function CreateNailFx(id)
    local tp = GetActorPos(id)
    if not tp then return nil end
    local node = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Nail"), tp.x, tp.y, 0, 0, false)
    GUI:setLocalZOrder(node, CONST.ZORDER_NAIL)
    GUI:DrawRect_Create(node, "stake", -4, -8, 8, 16,
        CONST.COLOR_DEEP, 240)
    GUI:DrawCircle_Create(node, "lock", 0, -4, 22,
        CONST.COLOR_NAIL, 2, 220)
    return node
end

function NoGround.Cast()
    if _cdLeft > 0 or _rootT > 0 then return end
    local tid = SL:GetValue("MARK_TARGET_ID")
    if not tid then return end
    _cdLeft = CONST.ROOT_CD
    _rootT = CONST.ROOT_LIFE
    _rootID = tid
    SL:FreezeActorMove(tid, CONST.ROOT_LIFE)
    SafeRemove(_nailFx)
    _nailFx = CreateNailFx(tid)
    SL:PlayNailFx(tid)
    SL:TipAbove(tid, "钉！")
    ShowTip("钉住了——四秒里它只能站在原地放箭")
end

-- 定时器：锁足倒计时与钉子跟脚
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _rootT > 0 then
            _rootT = _rootT - dt
            local tp = GetActorPos(_rootID)
            if _nailFx and tp then
                GUI:setPosition(_nailFx, tp.x, tp.y)
            end
            if _rootT <= 0 or not tp
                or SL:GetValue("ACTOR_DEAD", _rootID) then
                _rootT = 0
                SafeRemove(_nailFx)
                ShowTip("钉子松了——它又要开始放风筝了")
            end
        end
    end, 0.02)
end

-- 位移驳回：锁足期一切移动指令无效
SL:RegisterLUAEvent(LUA_EVENT_MOVE_REQUEST, "NGD_Lock", function(tid)
    if _rootT > 0 and tid == _rootID then
        return false
    end
    return true
end)

SL:ScheduleOnce(function()
    SL:BindDebugButton("禁足", function()
        NoGround.Cast()
    end)
    ShowTip("技能已加载: 禁足 (调试按钮触发)")
end, 1.0)

function NoGround.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SL:UnregisterLUAEvent(LUA_EVENT_MOVE_REQUEST, "NGD_Lock")
    SafeRemove(_nailFx)
end

return NoGround