磁引：四秒磁点，它的箭全拐进这点碎掉

 fx-magnetpull

-- @file MagnetPull.lua
-- 磁引 —— 四秒磁点，它的箭全拐进这点碎掉

local MagnetPull = {}

local CONST = {
    MAG_LIFE      = 4.0,
    MAG_CD        = 5.0,
    MAG_POINT_X   = 340,
    MAG_POINT_Y   = -60,
    EAT_RADIUS    = 14,

    COLOR_MAG     = "#8868b8",
    COLOR_DEEP    = "#2a1a52",
    COLOR_GHOST   = "#d8c8f4",

    ZORDER_MAG    = 130,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1058000,
}

local _magT      = 0
local _magX      = CONST.MAG_POINT_X
local _saved      = 0
local _cdLeft    = 0
local _magFx     = nil
local _scheduler = nil
local _autoInc   = 0

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

function MagnetPull.Cast()
    if _cdLeft > 0 or _magT > 0 then return end
    local tid = SL:GetValue("MARK_TARGET_ID")
    if not tid then return end
    _cdLeft = CONST.MAG_CD
    _magT = CONST.MAG_LIFE
    SafeRemove(_magFx)
    _magFx = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Mag"), CONST.MAG_POINT_X, 0, 0, 0, false)
    GUI:setLocalZOrder(_magFx, CONST.ZORDER_MAG)
    SL:PlayMagnetUpFx(CONST.MAG_POINT_X)
    SL:TipAboveMe("磁引！")
    ShowTip("磁点开了——四秒里它的箭全拐进这点")
end

-- 聚碎结算：磁期箭体到点即碎
SL:RegisterLUAEvent(LUA_EVENT_BOLT_TICK, "MGP_Eat", function(list)
    if _magT <= 0 then return end
    for i = #list.enemy, 1, -1 do
        local b = list.enemy[i]
        if math.abs(b.x - _magX) <= CONST.EAT_RADIUS then
            SL:PlayShatterFx(b.x, b.y)
            _saved = _saved + 1
            table.remove(list.enemy, i)
            ShowTip("拦下一支——已经省了" .. _saved * 12 .. "点血")
        end
    end
end)

-- 定时器：磁点倒计时与磁环跟脚
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _magT > 0 then
            _magT = _magT - dt
            if _magFx then
                GUI:setPosition(_magFx, _magX,
                    GetActorPos(SL:GetValue("USER_ID"))
                    and select(2, GetActorPos(SL:GetValue("USER_ID")))
                    or 0)
            end
            if _magT <= 0 then
                SafeRemove(_magFx)
                _magFx = nil
                ShowTip("磁散了——它的箭恢复直飞")
            end
        end
    end, 0.02)
end

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

function MagnetPull.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SL:UnregisterLUAEvent(LUA_EVENT_BOLT_TICK, "MGP_Eat")
    SafeRemove(_magFx)
    _magT = 0
    _saved = 0
end

return MagnetPull