地刺追命：沿着一条线裂到敌阵

fx-spikeline

local SpikeLine = {}
local CONST = { MSG_ID = 12190, KEY = "SpikeLine", SPEED = 600, LEN = 460, AIR_VY = -150 }

function SpikeLine.Cast(myID)
    local myX = SL:GetValue("ACTOR_POSITION_X", myID)
    local dirSign = SL:GetValue("ACTOR_DIR", myID) == 2 and 1 or -1
    SpikeLine._head = myX + 40 * dirSign
    SpikeLine._dir = dirSign
    SpikeLine._end = myX + dirSign * CONST.LEN

    SpikeLine._sched = SL:Schedule(function(dt)
        SpikeLine:Update(dt)
    end, 0.02)
end

function SpikeLine:Update(dt)
    self._head = self._head + self._dir * CONST.SPEED * dt
    SpawnSpikeAt(self._head)                            -- 刺头位置拱出新刺
    SpawnDirtDebris(self._head)                         -- 沿途碎土

    for _, id in ipairs(SL:GetValue("FIND_IN_VIEW_MONSTER_LIST") or {}) do
        if not self._hit[id] then
            local mx = SL:GetValue("ACTOR_POSITION_X", id)
            if math.abs(self._head - mx) < 32 then
                self._hit[id] = true
                SL:SendLuaNetMsg(CONST.MSG_ID, id, 0, CONST.AIR_VY,
                    SL:JsonEncode({ key = CONST.KEY, op = 2, hit = id }))
            end
        end
    end

    if (self._dir > 0 and self._head >= self._end)
        or (self._dir < 0 and self._head <= self._end) then
        SL:UnSchedule(self._sched)                      -- 推进完成, 注销心跳
        self._sched = nil
    end
end

return SpikeLine