回响：一刀出手两秒后，余音还在收账

 fx-echoquake

-- @file EchoQuake.lua
-- 回响 —— 一刀出手两秒后，余音还在收账

local EchoQuake = {}

local CONST = {
    STRIKE_DMG    = 16,
    ECHO_DMG      = 8,
    ECHO_DELAY    = 2.0,
    ECHO_RADIUS   = 44,
    STRIKE_CD     = 3.0,

    COLOR_ECHO    = "#b878e0",
    COLOR_DEEP    = "#3e1a5e",
    COLOR_GHOST   = "#e0c8f8",

    ZORDER_RING   = 129,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1001000,
}

local _echoes    = {}
local _cdLeft    = 0
local _scheduler = nil
local _autoInc   = 0

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "EQK",
        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 DropEchoRing(x, y)
    local node = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Ring"), x, y, 0, 0, false)
    GUI:setLocalZOrder(node, CONST.ZORDER_RING)
    GUI:DrawCircle_Create(node, "ring", 0, 0, 34,
        CONST.COLOR_ECHO, 2, 200)
    return node
end

function EchoQuake.Strike()
    if _cdLeft > 0 then
        ShowTip("音在荡——" .. string.format("%.1f", _cdLeft) .. "秒")
        return
    end
    local tid = SL:GetValue("MARK_TARGET_ID")
    local tp = GetActorPos(tid)
    if not tid or not tp then return end
    _cdLeft = CONST.STRIKE_CD
    SL:ActorHurt(tid, CONST.STRIKE_DMG)
    SL:TipAbove(tid, "-" .. CONST.STRIKE_DMG)
    SL:PlayStrikeFx(tid)
    SL:ScreenShake(2.4, 0.16)
    SafeRemove(_ringFx)
    _ringFx = DropEchoRing(tp.x, tp.y)
    table.insert(_echoes, { x = tp.x, t = CONST.ECHO_DELAY })
    ShowTip("一刀十六留了枚音环——两秒后原地重放八点")
end

-- 延时重放：倒计时归零，环心结算
local function ReplayEcho(ek)
    local myID = SL:GetValue("USER_ID")
    SL:PlayEchoBurstFx(ek.x, myID)
    local tid = SL:GetValue("MARK_TARGET_ID")
    local tp = tid and GetActorPos(tid)
    if tp and math.abs(tp.x - ek.x) <= CONST.ECHO_RADIUS then
        SL:ActorHurt(tid, CONST.ECHO_DMG)
        SL:TipAbove(tid, "余-8")
        ShowTip("余音收账——八点入账")
        if SL:GetValue("ACTOR_DEAD", tid) then
            SafeRemove(_ringFx)
        end
    else
        SafeRemove(_ringFx)
        ShowTip("它走出了音环——这一笔收不回了")
    end
end

-- 定时器：回放表推进与音环跟数
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        for i = #_echoes, 1, -1 do
            local ek = _echoes[i]
            ek.t = ek.t - dt
            if ek.t <= 0 then
                table.remove(_echoes, i)
                ReplayEcho(ek)
            end
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("鸣", function()
        EchoQuake.Strike()
    end)
    ShowTip("技能已加载: 回响 (调试按钮触发)")
end, 1.0)

function EchoQuake.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SafeRemove(_ringFx)
    _echoes = {}
end

return EchoQuake