十字斩：两道弧光交叉处无活口

SL:PlayFlyFx("crescent", ox, oy, tx, ty, 620, { spin = 9 })

fx-cross

local CrossSlash = {}
local KEY = { SPEED = 620, BONUS = 30 }
local pending = {}

local function FireArc(self_, target, ox, oy, spin)
    local sx = SL:GetValue("actorX", self_) + 20
    local sy = SL:GetValue("actorY", self_) + oy
    local tx = SL:GetValue("actorX", target) - 30
    local ty = SL:GetValue("actorY", target) - 58
    SL:PlayFlyFx("crescent", sx, sy, tx, ty, KEY.SPEED, { spin = spin },
        function()
            pending[#pending + 1] = { x = tx, y = ty, t = SL:GetValue("engineTime") }
            CrossSlash.TryMerge(target)
        end)
end

function CrossSlash.Cast(self_, target)
    if SL:GetValue("crossFlying") then return end
    SL:SetValue("crossFlying", true)
    SL:PlayActorAct(self_, "attack")
    -- 错位出发: 上弧高 38, 下弧低 36, 旋向相反
    FireArc(self_, target, -96, 0.5)
    FireArc(self_, target, -22, -0.5)
    SL:ScheduleOnce(function()
        SL:SetValue("crossFlying", false)
    end, 1.2)
end

function CrossSlash.TryMerge(target)
    -- 两道弧的到达时间差小于一帧才算同帧交汇
    if #pending < 2 then return end
    local a, b = pending[1], pending[2]
    if math.abs(a.t - b.t) > 0.016 then
        -- 没赶上同帧: 各算各的普通命中
        SL:DeductHp(target, 14)
        SL:ShowHitNum(target, 14, "normal")
        pending = {}
        return
    end
    pending = {}
    local bonus = KEY.BONUS
    SL:FreezeFrame(0.06)
    SL:PlayFxAt("cross_burst", a.x, a.y)
    SL:ScreenShake(0.28, 5)
    SL:DeductHp(target, 28 + bonus)
    SL:ShowHitNum(target, 28 + bonus, "cross")
    SL:PlayActorAct(target, "stuck")
end

return CrossSlash