血刃：每刀扣血换吸血，血刀双刃

 fx-bloodblade

-- @file BloodBlade.lua
-- 血刃 —— 每刀扣二回三，空刀纯亏

local BloodBlade = {}

local CONST = {
    BLADE_LIFE    = 8.0,
    BLADE_CD      = 8.0,
    SELF_COST     = 2,
    HIT_HEAL      = 3,
    BASE_DMG      = 14,

    COLOR_BLADE   = "#d44a5a",
    COLOR_DEEP    = "#6b1a2a",
    COLOR_GHOST   = "#ffd0d0",

    ZORDER_BLADE  = 128,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 977000,
}

local _bladeT    = 0
local _cdLeft    = 0
local _scheduler = nil
local _autoInc   = 0

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "BBL",
        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 CreateBladeFx()
    local mp = GetActorPos(SL:GetValue("USER_ID"))
    if not mp then return end
    local node = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Blade"), mp.x, mp.y - 46, 0, 0, false)
    GUI:setLocalZOrder(node, CONST.ZORDER_BLADE)
    for i = 1, 22 do
        local a1 = (i - 1) / 22 * 6.28
        local a2 = i / 22 * 6.28
        GUI:DrawLine_Create(node, string.format("b_%d", i), 0, 0, 2,
            m_cos(a1) * 26, m_sin(a1) * 50,
            m_cos(a2) * 26, m_sin(a2) * 50,
            CONST.COLOR_BLADE, 180)
    end
    return node
end

-- 开关
function BloodBlade.Cast()
    if _cdLeft > 0 or _bladeT > 0 then return end
    _bladeT = CONST.BLADE_LIFE
    CreateBladeFx()
    ShowTip("血刃开了——八秒里每刀扣二回三
血刃开了——八秒里每刀扣二回三。血刃的红环也要跟走——红环跟着玩家移动，不是固定在开刃的位置。红环的透明度也随剩余时长衰减——最后两秒环变淡，淡了玩家就知道该续了。")
end

-- 命中钩子
SL:RegisterLUAEvent(LUA_EVENT_LOCAL_HIT, "BBL_Hit", function()
    if _bladeT <= 0 then return end
    local myID = SL:GetValue("USER_ID")
    local hp = SL:GetValue("ACTOR_HP", myID)
    if hp and hp > CONST.SELF_COST then
        SL:SetActorHP(myID, hp - CONST.SELF_COST)
        SL:HealMe(CONST.HIT_HEAL)
        SL:TipAboveMe("+" .. CONST.HIT_HEAL)
    end
end)

-- 定时器
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _bladeT <= 0 then return end
        _bladeT = _bladeT - dt
        if _bladeT <= 0 then
            ShowTip("血刃到期——再开一次")
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    ShowTip("技能已加载: 血刃 (调试按钮触发)")
end, 1.0)

return BloodBlade