霜镜：架起霜镜，弹道冻着原路画回

 fx-frostmirror

-- @file FrostMirror.lua
-- 霜镜 —— 架起霜镜，弹道冻住原路画回

local FrostMirror = {}

local CONST = {
    MIRROR_LIFE   = 3.0,
    MIRROR_CD     = 6.0,
    FREEZE_DUR    = 1.0,
    REFLECT_DMG   = 22,
    BOLT_SPEED    = 250,

    COLOR_MIRROR  = "#8ec8e8",
    COLOR_DEEP    = "#1a4a6e",
    COLOR_GHOST   = "#d8f0fa",

    ZORDER_MIRROR = 127,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 982000,
}

local _mirrorT   = 0
local _mirrorX   = 0
local _cdLeft    = 0
local _bolts     = {}
local _scheduler = nil
local _autoInc   = 0

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "FRM",
        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 CreateMirrorNode(x)
    local node = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Mirror"), x, 0, 0, 0, false)
    GUI:setLocalZOrder(node, CONST.ZORDER_MIRROR)
    for row = 0, 18 do
        GUI:DrawLine_Create(node, "col_" .. row, 0, 0, 16,
            -8, -row * 4.2, 8, -row * 4.2,
            row % 2 == 0 and CONST.COLOR_MIRROR
                or CONST.COLOR_DEEP, 210)
    end
    return node
end

-- 立镜
function FrostMirror.Cast()
    if _cdLeft > 0 or _mirrorT > 0 then return end
    _cdLeft = CONST.MIRROR_CD
    _mirrorT = CONST.MIRROR_LIFE
    local mp = GetActorPos(SL:GetValue("USER_ID"))
    local tp = GetActorPos(SL:GetValue("MARK_TARGET_ID"))
    if mp and tp then
        _mirrorX = (mp.x + tp.x) / 2
        CreateMirrorNode(_mirrorX)
        ShowTip("霜镜立了——三秒，弹道撞上就冻着画回去")
    end
end

-- 弹道推进与冰冻反转
local function Bolt_Update(b, dt)
    b.x = b.x + b.vx * dt
    if not b.back and _mirrorT > 0
        and math.abs(b.x - _mirrorX) <= 14 then
        b.vx = -b.vx
        b.back = true
        b.frozen = true
        SL:PlayReflectFx(b.x, b.y)
        ShowTip("弹道冻住画回去了——还带着冰冻效果")
        return true
    end
    if b.back then
        local tp = GetActorPos(SL:GetValue("MARK_TARGET_ID"))
        if tp and math.abs(b.x - tp.x) < 20 then
            SL:ActorHurt(SL:GetValue("MARK_TARGET_ID"),
                CONST.REFLECT_DMG)
            SL:FreezeActor(SL:GetValue("MARK_TARGET_ID"),
                CONST.FREEZE_DUR)
            SL:TipAbove(SL:GetValue("MARK_TARGET_ID"),
                "-" .. CONST.REFLECT_DMG .. " 冻")
            return false
        end
    end
    return b.x > -20 and b.x < 700
end

if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _mirrorT > 0 then
            _mirrorT = _mirrorT - dt
            if _mirrorT <= 0 then
                ShowTip("镜墙化了——三秒的弹道反制结束了")
            end
        end
        for i = #_bolts, 1, -1 do
            if not Bolt_Update(_bolts[i], dt) then
                table.remove(_bolts, i)
            end
        end
    end, 0.02)
end

return FrostMirror