烟幕弹：放一颗烟雾金蝉脱壳

fx-smoke

local SmokeScreen = {}
local CONST = { MSG_ID = 12380, KEY = "SmokeScreen", RADIUS = 90, DURATION = 4 }

function SmokeScreen.Cast(myID, x, y)
    SmokeScreen._x, SmokeScreen._y = x, y
    SmokeScreen._left = CONST.DURATION
    SmokeScreen._sched = SL:Schedule(function(dt)
        SmokeScreen:Update(dt)
    end, 0.02)
    SL:SendLuaNetMsg(CONST.MSG_ID, 0, 0, 0,
        SL:JsonEncode({ key = CONST.KEY, op = 1, actorID = myID, x = x, y = y }))
end

function SmokeScreen:Update(dt)
    self._left = self._left - dt
    if self._left <= 0 then
        SL:UnSchedule(self._sched)
        self._sched = nil
        return
    end
    local inSmoke = self:InSmoke(SL:GetValue("USER_ID"))
    -- 玩家在烟中: 怪的仇恨目标置空
    local mob = FindNearestMob(self._x, self._y)
    if mob then
        if inSmoke then
            mob:LostTarget()                            -- 感知遮蔽: 转巡逻
        else
            mob:RegainTarget()                          -- 出烟: 重新索敌
        end
    end
end

function SmokeScreen:InSmoke(actorID)
    local ax = SL:GetValue("ACTOR_POSITION_X", actorID)
    local ay = SL:GetValue("ACTOR_POSITION_Y", actorID)
    return math.sqrt((ax - self._x) ^ 2 + ((ay - self._y) / 0.5) ^ 2) <= 90
end

return SmokeScreen