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教程:制作附加包/交易表
From Minecraft基岩版开发Wiki
 | 本条目仍需完善。 |
在这之前[edit]
我们先要看一下村民交易列表的GUI结构（以图书管理员为例）：
可以分为以下要点：
- Minecraft将交易列表进行分级，只要达到一定等级才可以解锁更多交易。
- 交易一次可为村民增加交易经验（交易栏上方的经验条），积累到一定经验后可以解锁下一等级的交易。
- 至少要有一级新手级（流浪商人的交易列表默认隐藏）。
- 每一级中至少有一个或更多的交易。
知道这些游戏内容后，我们可以继续下一步的教程。
基本结构[edit]
交易表的json文件存放在行为包/trades文件夹中。
新建一个json文件，放入以下字段：
{
"tiers":[
]
}
可以看到交易表没有声明格式版本和赋命名空间标识符。
在"tiers"数组内，每一个JSON对象都代表着一个交易等级，需填入以下字段：
[
{
"total_exp_required": 0,//交易所需经验
"groups": []
}
]
注意：交易表中一定要有所需经验为0的交易等级！！！
到了"groups"数组，就要定义交易内容了，每个交易栏位是一个JSON对象，格式如下（从图书管理员中截取）：
{
"num_to_select": 1,//从以下交易中随机选一个，放置到交易列表。
"trades": [//交易内容
{
"wants": [//被交易物品
//一个物品定义一个JSON对象
{
"item": "minecraft:paper",//物品的赋命名空间标识符
"quantity": 24,//数量
"price_multiplier": 0.05//价格乘数
}
],
"gives": [//交易后物品
{
"item": "minecraft:emerald",
"quantity": 1
}
],
"trader_exp": 2,//村民交易后获得的经验
"max_uses": 16,//村民单种交易上限
"reward_exp": true//是否给予玩家经验
}
]
}
到这里，基本上交易表应该可以被Minecraft读取了，下面是一些特殊的定义。
函数引用[edit]
在图书管理员的交易列表中，有一种特殊的交易表，用绿宝石和书交易附魔书，这种交易需用到函数。 函数的基本结构如下：
"functions":[
{
"function": "需要调用的函数"
},
{...}
]
以下是各个函数[需要更多信息]：
enchant_book_for_trading[edit]
将书附上附魔。
结构如下[需要验证]：
"functions": [
{
"function": "enchant_book_for_trading",
"base_cost": 2,//附魔失败时物品最少需要的绿宝石
"base_random_cost": 5,//附魔上1级附魔成功时最少需要的绿宝石
"per_level_random_cost": 10,//附魔书花费的绿宝石上限（此项加下一项的数值）
"per_level_cost": 3//每高一级需要的绿宝石
}
示例[edit]
如果没有错误，交易表应该为如下形式（以图书管理员的交易列表为例）：
{
"tiers": [
{
"total_exp_required": 0,
"groups": [
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:paper",
"quantity": 24,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:emerald",
"quantity": 1
}
],
"trader_exp": 2,
"max_uses": 16,
"reward_exp": true
}
]
},
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:emerald",
"quantity": 9,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:bookshelf",
"quantity": 1
}
],
"trader_exp": 1,
"max_uses": 12,
"reward_exp": true
},
{
"wants": [
{
"item": "minecraft:emerald",
"price_multiplier": 0.2
},
{
"item": "minecraft:book",
"quantity": 1,
"price_multiplier": 0.2
}
],
"gives": [
{
"item": "minecraft:book",
"quantity": 1,
"functions": [
{
"function": "enchant_book_for_trading",
"base_cost": 2,
"base_random_cost": 5,
"per_level_random_cost": 10,
"per_level_cost": 3
}
]
}
],
"trader_exp": 1,
"max_uses": 12,
"reward_exp": true
}
]
}
]
},
{
"total_exp_required": 10,
"groups": [
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:book",
"quantity": 4,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:emerald",
"quantity": 1
}
],
"trader_exp": 10,
"max_uses": 12,
"reward_exp": true
}
]
},
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:emerald",
"quantity": 1,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:lantern",
"quantity": 1
}
],
"trader_exp": 5,
"max_uses": 12,
"reward_exp": true
},
{
"wants": [
{
"item": "minecraft:emerald",
"price_multiplier": 0.2
},
{
"item": "minecraft:book",
"quantity": 1,
"price_multiplier": 0.2
}
],
"gives": [
{
"item": "minecraft:book",
"quantity": 1,
"functions": [
{
"function": "enchant_book_for_trading",
"base_cost": 2,
"base_random_cost": 5,
"per_level_random_cost": 10,
"per_level_cost": 3
}
]
}
],
"trader_exp": 5,
"max_uses": 12,
"reward_exp": true
}
]
}
]
},
{
"total_exp_required": 70,
"groups": [
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:dye:0",
"quantity": 5,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:emerald",
"quantity": 1
}
],
"trader_exp": 20,
"max_uses": 12,
"reward_exp": true
}
]
},
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:emerald",
"quantity": 1,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:glass",
"quantity": 4
}
],
"trader_exp": 10,
"max_uses": 12,
"reward_exp": true
},
{
"wants": [
{
"item": "minecraft:emerald",
"price_multiplier": 0.2
},
{
"item": "minecraft:book",
"quantity": 1,
"price_multiplier": 0.2
}
],
"gives": [
{
"item": "minecraft:book",
"quantity": 1,
"functions": [
{
"function": "enchant_book_for_trading",
"base_cost": 2,
"base_random_cost": 5,
"per_level_random_cost": 10,
"per_level_cost": 3
}
]
}
],
"trader_exp": 10,
"max_uses": 12,
"reward_exp": true
}
]
}
]
},
{
"total_exp_required": 150,
"groups": [
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:writable_book",
"quantity": 1,
"price_multiplier": 0.05
},
{
"item": "minecraft:writable_book",
"quantity": 1,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:emerald",
"quantity": 1
}
],
"trader_exp": 30,
"max_uses": 12,
"reward_exp": true
}
]
},
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:emerald",
"quantity": 4,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:compass",
"quantity": 1
}
],
"trader_exp": 15,
"max_uses": 12,
"reward_exp": true
},
{
"wants": [
{
"item": "minecraft:emerald",
"quantity": 5,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:clock",
"quantity": 1
}
],
"trader_exp": 15,
"max_uses": 12,
"reward_exp": true
},
{
"wants": [
{
"item": "minecraft:emerald",
"price_multiplier": 0.2
},
{
"item": "minecraft:book",
"quantity": 1,
"price_multiplier": 0.2
}
],
"gives": [
{
"item": "minecraft:book",
"quantity": 1,
"functions": [
{
"function": "enchant_book_for_trading",
"base_cost": 2,
"base_random_cost": 5,
"per_level_random_cost": 10,
"per_level_cost": 3
}
]
}
],
"trader_exp": 15,
"max_uses": 12,
"reward_exp": true
}
]
}
]
},
{
"total_exp_required": 250,
"groups": [
{
"num_to_select": 1,
"trades": [
{
"wants": [
{
"item": "minecraft:emerald",
"quantity": 20,
"price_multiplier": 0.05
}
],
"gives": [
{
"item": "minecraft:nametag",
"quantity": 1
}
],
"trader_exp": 30,
"max_uses": 12,
"reward_exp": true
}
]
}
]
}
]
}
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