59 lines
1.4 KiB
Lua
59 lines
1.4 KiB
Lua
-- TODO: move these to the general api.
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local function listify_table (tab)
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local copy = {}
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for _, item in pairs(tab) do
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table.insert(copy, item)
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end
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return copy
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end
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local function shuffle (tab)
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tab = listify_table(tab)
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local shuffled = {}
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repeat
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local index = math.random(1, #tab)
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local value = tab[index]
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table.insert(shuffled, value)
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table.remove(tab, index)
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until #tab == 0
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return shuffled
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end
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blockgame.register_abm({
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nodenames = {"bg_terrain:grass"},
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neighbors = {"bg_terrain:dirt"},
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interval = 30,
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chance = 8,
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action = function (pos, node)
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local sides = listify_table(blockgame.vector.sides)
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local diagonally = {}
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for _, side in pairs(sides) do
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table.insert(diagonally, side + blockgame.vector.dirs.down)
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table.insert(diagonally, side + blockgame.vector.dirs.up)
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end
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sides = shuffle(sides)
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diagonally = shuffle(diagonally)
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for _, offset in pairs(sides) do
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if attempt_spread(pos + offset) then return true end
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end
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for _, offset in pairs(diagonally) do
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if attempt_spread(pos + offset) then return true end
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end
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return false
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end,
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})
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function attempt_spread (pos)
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local name = minetest.get_node(pos).name
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if not blockgame.item_matches(name, {"group:grassable"}) then return false end
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if not blockgame.air_flows_through(pos + blockgame.vector.dirs.up) then return false end
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minetest.set_node(pos, {name = "bg_terrain:grass"})
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return true
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end
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