sorting - 用于防止玩家获得同一张牌的算法

Question

我有一个我正在桌面模拟器中编码的游戏，其中所有玩家（P）都得到一张卡片（C）。一旦记住所有玩家将卡片放回牌组（D），洗牌，然后所有玩家都从同一牌组（D）中获得一张牌。我正在尝试编写最简单的算法来防止玩家获得自己的卡片。现在，当涉及到编码时，我认为这应该很简单，而不是创建模拟运行直到它成功。

Answer 1

假设您有以下内容：

• deck，包含所有牌（包括玩家见过的牌）的随机牌组。
• seen_card_id_by_player，一个查找表，为您提供玩家看到的牌的指导。

那么解决方案很简单

local card_ids = {}
for i, card_data in ipairs(deck.getObjects()) do
   table.insert(card_ids, card_data.guid)
end

for player, seen_card_id in pairs(seen_card_id_by_player) do
   local card_id = table.remove(card_ids)

   if card_id == seen_card_id then
      local i = math.random(1, #card_ids)
      card_ids[i], card_id = card_id, card_ids[i]
   end

   -- Deal the specific card.
   deck.takeObject({
      guid     = card_ids[i],
      position = player.getHandTransform().position,
      flip     = true,
   })
end

当我们选择玩家已经看过的牌时，它会被放回剩余牌中的随机位置。这确保了每张牌都有平等的机会被下一位玩家抽到。这是Fisher-Yates shuffle的基本原理。

---

完整演示

function broadcast_error(msg)
   broadcastToAll(msg, { r=1, g=0, b=0 })
end


function get_cards_seen_by_players()
   local player_ids = Player.getAvailableColors()

   local error = false
   local seen_card_by_player = {}
   for i, player_id in ipairs(player_ids) do
      local player = Player[player_id]
      local hand_objs = player.getHandObjects()
      local player_error = false
      if #hand_objs > 1 then
         player_error = true
      elseif #hand_objs == 1 then
         local card = hand_objs[1]
         if card.tag ~= "Card" then
            player_error = true
         else
            seen_card_by_player[player] = card
         end
      end

      if player_error then
         broadcast_error(player_id .. " doesn't have a valid hand.")
         error = true
      end
   end

   if error then
      return nil
   end

   return seen_card_by_player
end


function run()
   local deck = getObjectFromGUID("...")

   local seen_card_by_player = get_cards_seen_by_players()
   if seen_card_by_player == nil or next(seen_card_by_player) == nil then
      return
   end

   local seen_card_id_by_player = {}
   for player, card in pairs(seen_card_by_player) do
      local card_id = card.guid
      seen_card_id_by_player[player] = card_id
      card.putObject(deck)
   end

   deck.randomize()

   local card_ids = {}
   for i, card_data in ipairs(deck.getObjects()) do
      table.insert(card_ids, card_data.guid)
   end

   for player, seen_card_id in pairs(seen_card_id_by_player) do
      local card_id = table.remove(card_ids)

      if card_id == seen_card_id then
         local i = math.random(1, #card_ids)
         card_ids[i], card_id = card_id, card_ids[i]
      end

      deck.takeObject({
         guid     = card_ids[i],
         position = player.getHandTransform().position,
         flip     = true,
      })
   end
end

用一副纸牌创建游戏。将上面的代码放在全局中，替换...为卡组的 GUID。要运行演示，请将一张牌发给任意数量的玩家，然后/execute Global.call("run")在聊天窗口中使用。