【网络通信】广播择路：跨地图消息的最短路径下发

-- 广播择路：线路登记与选路
local player = class(actor)
local ROUTE_COST = {A = {A = 0, B = 5, C = 8}, B = {A = 5, B = 0, C = 3}, C = {A = 8, B = 3, C = 0}}
local function pickRoute(player, targetLine)
    local myLine = getplayvar(player, "HUMAN", "MyLine")
    local cost = ROUTE_COST[myLine] and ROUTE_COST[myLine][targetLine] or 99
    if cost == 0 then
        return "direct"
    elseif cost <= 5 then
        return "trunk1"
    end
    return "trunk2"
end

-- 广播择路：分组投递
local player = class(actor)
local function deliverByLine(player, targets, content)
    local byLine = {}
    for _, name in ipairs(targets) do
        local mate = class(name)
        local line = getplayvar(mate, "HUMAN", "MyLine") or "A"
        byLine[line] = byLine[line] or {}
        byLine[line][#byLine[line] + 1] = name
    end
    for line, names in pairs(byLine) do
        local route = pickRoute(player, line)
        sendluamsg(player, 9999, #names, 0, 0, route .. "|" .. table.concat(names, ","))
    end
end