90 lines
2.8 KiB
Lua
90 lines
2.8 KiB
Lua
|
mcl_loot = {}
|
||
|
|
|
||
|
|
--[[
|
||
|
|
Select a number of itemstacks out of a pool of treasure definitions randomly.
|
||
|
|
|
||
|
|
Parameters:
|
||
|
|
* loot_definitions: Probabilities and information about the loot to select. Syntax:
|
||
|
|
|
||
|
|
{
|
||
|
|
stacks_min = 1, -- Mamimum number of item stacks to get
|
||
|
|
stacks_max = 3, -- Number of repetitions, maximum
|
||
|
|
items = { -- Table of possible loot items. This function selects between stacks_min and stacks_max of these.
|
||
|
|
{
|
||
|
|
itemstring = "example:item1", -- Which item to select
|
||
|
|
amount_min = 1, -- Minimum size of itemstack. Optional (default: 1)
|
||
|
|
amount_max = 10, -- Maximum size of item stack. Must not exceed item definition's stack_max. Optional (default: 1)
|
||
|
|
wear_min = 1, -- Minimum wear value. Must be at lest 1. Optional (default: no wear)
|
||
|
|
wear_max = 1, -- Maxiumum wear value. Must be at lest 1. Optional (default: no wear)
|
||
|
|
weight = 5, -- Likelihood of this item being selected
|
||
|
|
},
|
||
|
|
{ -- more tables like above, one table per item stack }
|
||
|
|
}
|
||
|
|
}
|
||
|
|
* pr: PseudoRandom object
|
||
|
|
|
||
|
|
How weight works: The probability of a single item stack being selected is weight/total_weight, with
|
||
|
|
total_weight being the sum of all weight values in the items table.
|
||
|
|
|
||
|
|
Returns: Table of itemstrings
|
||
|
|
]]
|
||
|
|
function mcl_loot.get_loot(loot_definitions, pr)
|
||
|
|
local items = {}
|
||
|
|
|
||
|
|
local total_weight = 0
|
||
|
|
for i=1, #loot_definitions.items do
|
||
|
|
total_weight = total_weight + loot_definitions.items[i].weight
|
||
|
|
end
|
||
|
|
|
||
|
|
local stacks = pr:next(loot_definitions.stacks_min, loot_definitions.stacks_max)
|
||
|
|
for s=1, stacks do
|
||
|
|
local r = pr:next(1, total_weight)
|
||
|
|
|
||
|
|
local accumulated_weight = 0
|
||
|
|
local item
|
||
|
|
for i=1, #loot_definitions.items do
|
||
|
|
accumulated_weight = accumulated_weight + loot_definitions.items[i].weight
|
||
|
|
if accumulated_weight >= r then
|
||
|
|
item = loot_definitions.items[i]
|
||
|
|
break
|
||
|
|
end
|
||
|
|
end
|
||
|
|
if item then
|
||
|
|
local itemstring = item.itemstring
|
||
|
|
if item.amount_min and item.amount_max then
|
||
|
|
itemstring = itemstring .. " " .. pr:next(item.amount_min, item.amount_max)
|
||
|
|
end
|
||
|
|
if item.wear_min and item.wear_max then
|
||
|
|
if not item.amount_min and not item.amount_max then
|
||
|
|
itemstring = itemstring .. " 1"
|
||
|
|
end
|
||
|
|
itemstring = itemstring .. " " .. pr:next(item.wear_min, item.wear_max)
|
||
|
|
end
|
||
|
|
table.insert(items, itemstring)
|
||
|
|
else
|
||
|
|
minetest.log("error", "[mcl_loot] INTERNAL ERROR! Failed to select random loot item!")
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
return items
|
||
|
|
end
|
||
|
|
|
||
|
|
--[[
|
||
|
|
Repeat mcl_loot.get_loot multiple times for various loot_definitions.
|
||
|
|
Useful for filling chests.
|
||
|
|
|
||
|
|
* multi_loot_definitions: Table of loot_definitions (see mcl_loot.get_loot)
|
||
|
|
* pr: PseudoRandom object
|
||
|
|
|
||
|
|
Returns: Table of itemstrings ]]
|
||
|
|
function mcl_loot.get_multi_loot(multi_loot_definitions, pr)
|
||
|
|
local items = {}
|
||
|
|
for m=1, #multi_loot_definitions do
|
||
|
|
local group = mcl_loot.get_loot(multi_loot_definitions[m], pr)
|
||
|
|
for g=1, #group do
|
||
|
|
table.insert(items, group[g])
|
||
|
|
end
|
||
|
|
end
|
||
|
|
return items
|
||
|
|
end
|