斩钢一闪：穿身而过的刀痕

fx-gale

local SteelGale = {}
local CONST = { MSG_ID = 12340, KEY = "SteelGale", SPEED = 1800, DURATION = 0.16, HIT_W = 40 }

function SteelGale.Cast(myID, dirSign)
    SteelGale._dash = {
        dir = dirSign, left = CONST.DURATION,
        lastX = SL:GetValue("ACTOR_POSITION_X", myID),
        hit = {}
    }
    SteelGale._myID = myID
end

function SteelGale:Update(dt)
    local d = self._dash
    if not d then return end
    d.left = d.left - dt
    local myX = SL:GetValue("ACTOR_POSITION_X", self._myID)
    local nx = myX + d.dir * CONST.SPEED * dt
    SL:SetActorPosition(self._myID, nx)

    -- 路径段扫描: 上一帧位置到当前帧位置之间
    for _, id in ipairs(SL:GetValue("FIND_IN_VIEW_MONSTER_LIST") or {}) do
        if not d.hit[id] then
            local mx = SL:GetValue("ACTOR_POSITION_X", id)
            if mx > math.min(d.lastX, nx) and mx < math.max(d.lastX, nx) then
                d.hit[id] = true                        -- 每目标一次
                SL:SendLuaNetMsg(CONST.MSG_ID, id, 0, 0,
                    SL:JsonEncode({ key = CONST.KEY, op = 2, hit = id }))
            end
        end
    end
    d.lastX = nx

    if d.left <= 0 then self._dash = nil end
end

return SteelGale