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VoxeLibre-Fork-Pixel/mods/CORE/flowlib/init.lua

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2017-02-19 23:32:54 +01:00
flowlib = {}
--sum of direction vectors must match an array index
local function to_unit_vector(dir_vector)
--(sum,root)
-- (0,1), (1,1+0=1), (2,1+1=2), (3,1+2^2=5), (4,2^2+2^2=8)
local inv_roots = {[0] = 1, [1] = 1, [2] = 0.70710678118655, [4] = 0.5
, [5] = 0.44721359549996, [8] = 0.35355339059327}
local sum = dir_vector.x*dir_vector.x + dir_vector.z*dir_vector.z
return {x=dir_vector.x*inv_roots[sum],y=dir_vector.y
,z=dir_vector.z*inv_roots[sum]}
end
local is_touching = function(realpos,nodepos,radius)
local boarder = 0.5 - radius
return (math.abs(realpos - nodepos) > (boarder))
end
flowlib.is_touching = is_touching
local is_water = function(pos)
return (minetest.get_item_group(minetest.get_node(
{x=pos.x,y=pos.y,z=pos.z}).name
, "water") ~= 0)
end
flowlib.is_water = is_water
local node_is_water = function(node)
return (minetest.get_item_group(node.name, "water") ~= 0)
end
flowlib.node_is_water = node_is_water
local is_lava = function(pos)
return (minetest.get_item_group(minetest.get_node(
{x=pos.x,y=pos.y,z=pos.z}).name
, "lava") ~= 0)
end
flowlib.is_lava = is_lava
local node_is_lava = function(node)
return (minetest.get_item_group(node.name, "lava") ~= 0)
end
flowlib.node_is_lava = node_is_lava
local is_liquid = function(pos)
return (minetest.get_item_group(minetest.get_node(
{x=pos.x,y=pos.y,z=pos.z}).name
, "liquid") ~= 0)
end
flowlib.is_liquid = is_liquid
local node_is_liquid = function(node)
return (minetest.get_item_group(node.name, "liquid") ~= 0)
end
flowlib.node_is_liquid = node_is_liquid
--This code is more efficient
local function quick_flow_logic(node,pos_testing,direction)
local name = node.name
if not minetest.registered_nodes[name] then
return 0
end
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if minetest.registered_nodes[name].liquidtype == "source" then
local node_testing = minetest.get_node(pos_testing)
local param2_testing = node_testing.param2
if not minetest.registered_nodes[node_testing.name] then
return 0
end
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if minetest.registered_nodes[node_testing.name].liquidtype
~= "flowing" then
return 0
else
return direction
end
elseif minetest.registered_nodes[name].liquidtype == "flowing" then
local node_testing = minetest.get_node(pos_testing)
local param2_testing = node_testing.param2
if not minetest.registered_nodes[node_testing.name] then
return 0
end
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if minetest.registered_nodes[node_testing.name].liquidtype
== "source" then
return -direction
elseif minetest.registered_nodes[node_testing.name].liquidtype
== "flowing" then
if param2_testing < node.param2 then
if (node.param2 - param2_testing) > 6 then
return -direction
else
return direction
end
elseif param2_testing > node.param2 then
if (param2_testing - node.param2) > 6 then
return direction
else
return -direction
end
end
end
end
return 0
end
local quick_flow = function(pos,node)
local x = 0
local z = 0
if not node_is_liquid(node) then
return {x=0,y=0,z=0}
end
x = x + quick_flow_logic(node,{x=pos.x-1,y=pos.y,z=pos.z},-1)
x = x + quick_flow_logic(node,{x=pos.x+1,y=pos.y,z=pos.z}, 1)
z = z + quick_flow_logic(node,{x=pos.x,y=pos.y,z=pos.z-1},-1)
z = z + quick_flow_logic(node,{x=pos.x,y=pos.y,z=pos.z+1}, 1)
return to_unit_vector({x=x,y=0,z=z})
end
flowlib.quick_flow = quick_flow
--if not in water but touching, move centre to touching block
--x has higher precedence than z
--if pos changes with x, it affects z
local move_centre = function(pos,realpos,node,radius)
if is_touching(realpos.x,pos.x,radius) then
if is_liquid({x=pos.x-1,y=pos.y,z=pos.z}) then
node = minetest.get_node({x=pos.x-1,y=pos.y,z=pos.z})
pos = {x=pos.x-1,y=pos.y,z=pos.z}
elseif is_liquid({x=pos.x+1,y=pos.y,z=pos.z}) then
node = minetest.get_node({x=pos.x+1,y=pos.y,z=pos.z})
pos = {x=pos.x+1,y=pos.y,z=pos.z}
end
end
if is_touching(realpos.z,pos.z,radius) then
if is_liquid({x=pos.x,y=pos.y,z=pos.z-1}) then
node = minetest.get_node({x=pos.x,y=pos.y,z=pos.z-1})
pos = {x=pos.x,y=pos.y,z=pos.z-1}
elseif is_liquid({x=pos.x,y=pos.y,z=pos.z+1}) then
node = minetest.get_node({x=pos.x,y=pos.y,z=pos.z+1})
pos = {x=pos.x,y=pos.y,z=pos.z+1}
end
end
return pos,node
end
flowlib.move_centre = move_centre