nalc_game/mods/default/trees.lua

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2014-06-13 20:03:14 +02:00
--
-- Grow trees
--
local random = math.random
local function can_grow(pos)
local node_under = minetest.get_node_or_nil({x = pos.x, y = pos.y - 1, z = pos.z})
if not node_under then
return false
end
local name_under = node_under.name
local is_soil = minetest.get_item_group(name_under, "soil")
if is_soil == 0 then
return false
end
return true
end
minetest.register_abm({
nodenames = {"default:sapling"},
interval = 10,
chance = 50,
action = function(pos, node)
if not can_grow(pos) then
return
end
minetest.log("action", "A sapling grows into a tree at "..minetest.pos_to_string(pos))
default.grow_tree(pos, random(1, 4) == 1)
end
})
minetest.register_abm({
nodenames = {"default:junglesapling"},
interval = 10,
chance = 50,
action = function(pos, node)
if not can_grow(pos) then
return
end
minetest.log("action", "A jungle sapling grows into a tree at "..
minetest.pos_to_string(pos))
default.grow_jungletree(pos)
end
})
local c_air = minetest.get_content_id("air")
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local c_apple = minetest.get_content_id("default:apple")
local function add_trunk_and_leaves(data, a, pos, tree_cid, leaves_cid,
height, size, iters, is_apple_tree)
local x, y, z = pos.x, pos.y, pos.z
-- Trunk
for y_dist = 0, height - 1 do
local vi = a:index(x, y + y_dist, z)
if y_dist == 0 or data[vi] == c_air or data[vi] == leaves_cid then
data[vi] = tree_cid
end
end
-- Force leaves near the trunk
for z_dist = -1, 1 do
for y_dist = -size, 1 do
local vi = a:index(x - 1, y + height + y_dist, z + z_dist)
for x_dist = -1, 1 do
if data[vi] == c_air then
if is_apple_tree and random(1, 8) == 1 then
data[vi] = c_apple
else
data[vi] = leaves_cid
end
end
vi = vi + 1
end
end
end
-- Randomly add leaves in 2x2x2 clusters.
for i = 1, iters do
local clust_x = x + random(-size, size - 1)
local clust_y = y + height + random(-size, 0)
local clust_z = z + random(-size, size - 1)
for xi = 0, 1 do
for yi = 0, 1 do
for zi = 0, 1 do
local vi = a:index(clust_x + xi, clust_y + yi, clust_z + zi)
if data[vi] == c_air then
if is_apple_tree and random(1, 8) == 1 then
data[vi] = c_apple
else
data[vi] = leaves_cid
end
end
end
end
end
end
end
local c_tree = minetest.get_content_id("default:tree")
local c_leaves = minetest.get_content_id("default:leaves")
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function default.grow_tree(pos, is_apple_tree, bad)
--[[
NOTE: Tree-placing code is currently duplicated in the engine
and in games that have saplings; both are deprecated but not
replaced yet
--]]
if bad then
error("Deprecated use of default.grow_tree")
end
local x, y, z = pos.x, pos.y, pos.z
local height = random(4, 5)
local vm = minetest.get_voxel_manip()
local minp, maxp = vm:read_from_map(
{x = pos.x - 2, y = pos.y, z = pos.z - 2},
{x = pos.x + 2, y = pos.y + height + 1, z = pos.z + 2}
)
local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
local data = vm:get_data()
add_trunk_and_leaves(data, a, pos, c_tree, c_leaves, height, 2, 8, is_apple_tree)
vm:set_data(data)
vm:write_to_map()
vm:update_map()
end
local c_jungletree = minetest.get_content_id("default:jungletree")
local c_jungleleaves = minetest.get_content_id("default:jungleleaves")
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function default.grow_jungletree(pos, bad)
--[[
NOTE: Tree-placing code is currently duplicated in the engine
and in games that have saplings; both are deprecated but not
replaced yet
--]]
if bad then
error("Deprecated use of default.grow_jungletree")
end
local x, y, z = pos.x, pos.y, pos.z
local height = random(8, 12)
local vm = minetest.get_voxel_manip()
local minp, maxp = vm:read_from_map(
{x = pos.x - 3, y = pos.y - 1, z = pos.z - 3},
{x = pos.x + 3, y = pos.y + height + 1, z = pos.z + 3})
local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
local data = vm:get_data()
add_trunk_and_leaves(data, a, pos, c_jungletree, c_jungleleaves, height, 3, 30, false)
-- Roots
for z_dist = -1, 1 do
local vi_1 = a:index(x - 1, y - 1, z + z_dist)
local vi_2 = a:index(x - 1, y, z + z_dist)
for x_dist = -1, 1 do
if random(1, 3) >= 2 then
if data[vi_1] == c_air then
data[vi_1] = c_jungletree
elseif data[vi_2] == c_air then
data[vi_2] = c_jungletree
end
end
vi_1 = vi_1 + 1
vi_2 = vi_2 + 1
end
end
vm:set_data(data)
vm:write_to_map()
vm:update_map()
end
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