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--[[
This file provides an example of a simple crafting system.
--]]
-- This function is called by the game engine when a character tries to craft
-- something from items in its inventory
function on_craft(ch, recipe)
-- ch is the crafting character
--
-- recipe is a table with the ingredients.
-- it is a common 1-based array. each element of this array is a table with
-- the two keys "id" and "amount".
-- The engine has already checked that the character owns enough of those
-- things, so you needn't do this again.
-- uncomment one (but not both!) of the following three lines to enable the
-- example crafting systems
mana.chat_message(ch, "There is no crafting in this game world.")
--craft_strict(ch, recipe)
--craft_lax(ch, recipe)
end
-- a primitive example crafting system which cares about item order and exact amount
function craft_strict(ch, recipe)
if (recipe[1].id == 8 and recipe[1].amount == 2 and -- has two iron
recipe[2].id == 9 and recipe[2].amount == 1) -- and one wood
then
mana.chr_inv_change(ch,
8, -2, --take away the iron
9, -1, --take away the wood
5, 1 ) -- give a sword
mana.chat_message(ch, "You've crafted a sword")
return
end
mana.chat_message(ch, "This wouldn't create anything useful")
end
-- a primitive example crafting system which doesn't care about item order
-- and amount. It even allows to mention the same item multiple times.
function craft_lax(ch, recipe)
recipe = make_condensed_and_sorted_item_list(recipe)
if (recipe[1].id == 8 and recipe[1].amount >= 2 and -- has at least two iron
recipe[2].id == 9 and recipe[2].amount >= 1) -- and at least one wood
then
mana.chr_inv_change(ch,
8, -2, -- take away the iron
9, -1, -- take away the wood
5, 1 ) -- give a sword
mana.chat_message(ch, "You've crafted a sword")
return
end
mana.chat_message(ch, "This wouldn't create anything useful")
end
-- this turns multiple occurences of the same item into one by adding up
-- their amounts and sorts the recipe by item ID.
-- This makes stuff a lot easier when your crafting system isn't supposed to
-- care about the order items are in.
function make_condensed_and_sorted_item_list(recipe)
local condensed = {}
for index, item in pairs(recipe) do
if condensed[item.id] == nil then
condensed[item.id] = item.amount
else
condensed[item.id] = condensed[item.id] + item.amount
end
end
local sorted = {}
for id, amount in pairs(condensed) do
local item = {}
item.id = id
item.amount = amount
table.insert(sorted, item)
end
table.sort(sorted, function(item1, item2)
return (item1.id < item2.id)
end)
return sorted
end
mana.on_craft(on_craft)
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