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210 lines
7.2 KiB
Lua
210 lines
7.2 KiB
Lua
-- This file provides the actual flow and pathfinding logic that makes water
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-- move through the pipes.
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--
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-- Contributed by mauvebic, 2013-01-03, rewritten a bit by Vanessa Ezekowitz
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--
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local finitewater = minetest.settings:get_bool("liquid_finite")
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pipeworks.check_for_liquids = function(pos)
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local coords = {
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{x=pos.x,y=pos.y-1,z=pos.z},
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{x=pos.x,y=pos.y+1,z=pos.z},
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{x=pos.x-1,y=pos.y,z=pos.z},
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{x=pos.x+1,y=pos.y,z=pos.z},
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{x=pos.x,y=pos.y,z=pos.z-1},
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{x=pos.x,y=pos.y,z=pos.z+1}, }
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for i =1,6 do
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local name = minetest.get_node(coords[i]).name
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if name and string.find(name,"water") then
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if finitewater then minetest.remove_node(coords[i]) end
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return true
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end
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end
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return false
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end
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pipeworks.check_for_inflows = function(pos,node)
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local coords = {
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{x=pos.x,y=pos.y-1,z=pos.z},
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{x=pos.x,y=pos.y+1,z=pos.z},
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{x=pos.x-1,y=pos.y,z=pos.z},
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{x=pos.x+1,y=pos.y,z=pos.z},
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{x=pos.x,y=pos.y,z=pos.z-1},
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{x=pos.x,y=pos.y,z=pos.z+1},
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}
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local newnode = false
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local source = false
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for i = 1, 6 do
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if newnode then break end
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local testnode = minetest.get_node(coords[i])
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local name = testnode.name
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if name and (name == "pipeworks:pump_on" and pipeworks.check_for_liquids(coords[i])) or string.find(name,"_loaded") then
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if string.find(name,"_loaded") then
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source = minetest.get_meta(coords[i]):get_string("source")
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if source == minetest.pos_to_string(pos) then break end
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end
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if string.find(name, "valve") or string.find(name, "sensor") then
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if ((i == 3 or i == 4) and minetest.facedir_to_dir(testnode.param2).x ~= 0)
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or ((i == 5 or i == 6) and minetest.facedir_to_dir(testnode.param2).z ~= 0)
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or ((i == 1 or i == 2) and minetest.facedir_to_dir(testnode.param2).y ~= 0) then
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newnode = string.gsub(node.name,"empty","loaded")
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source = {x=coords[i].x,y=coords[i].y,z=coords[i].z}
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end
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else
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newnode = string.gsub(node.name,"empty","loaded")
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source = {x=coords[i].x,y=coords[i].y,z=coords[i].z}
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end
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end
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end
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if newnode then
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minetest.add_node(pos,{name=newnode, param2 = node.param2})
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minetest.get_meta(pos):set_string("source",minetest.pos_to_string(source))
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end
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end
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pipeworks.check_sources = function(pos,node)
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local sourcepos = minetest.string_to_pos(minetest.get_meta(pos):get_string("source"))
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if not sourcepos then return end
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local source = minetest.get_node(sourcepos).name
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local newnode = false
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if source and not ((source == "pipeworks:pump_on" and pipeworks.check_for_liquids(sourcepos)) or string.find(source,"_loaded") or source == "ignore" ) then
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newnode = string.gsub(node.name,"loaded","empty")
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end
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if newnode then
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minetest.add_node(pos,{name=newnode, param2 = node.param2})
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minetest.get_meta(pos):set_string("source","")
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end
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end
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pipeworks.spigot_check = function(pos, node)
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local belowname = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z}).name
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if belowname and (belowname == "air" or belowname == "default:water_flowing" or belowname == "default:water_source") then
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local spigotname = minetest.get_node(pos).name
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local fdir=node.param2 % 4
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local check = {
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{x=pos.x,y=pos.y,z=pos.z+1},
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{x=pos.x+1,y=pos.y,z=pos.z},
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{x=pos.x,y=pos.y,z=pos.z-1},
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{x=pos.x-1,y=pos.y,z=pos.z}
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}
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local near_node = minetest.get_node(check[fdir+1])
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if near_node and string.find(near_node.name, "_loaded") then
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if spigotname and spigotname == "pipeworks:spigot" then
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minetest.add_node(pos,{name = "pipeworks:spigot_pouring", param2 = fdir})
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if finitewater or belowname ~= "default:water_source" then
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minetest.add_node({x=pos.x,y=pos.y-1,z=pos.z},{name = "default:water_source"})
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end
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end
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else
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if spigotname == "pipeworks:spigot_pouring" then
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minetest.add_node({x=pos.x,y=pos.y,z=pos.z},{name = "pipeworks:spigot", param2 = fdir})
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if belowname == "default:water_source" and not finitewater then
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minetest.remove_node({x=pos.x,y=pos.y-1,z=pos.z})
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end
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end
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end
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end
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end
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pipeworks.fountainhead_check = function(pos, node)
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local abovename = minetest.get_node({x=pos.x,y=pos.y+1,z=pos.z}).name
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if abovename and (abovename == "air" or abovename == "default:water_flowing" or abovename == "default:water_source") then
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local fountainhead_name = minetest.get_node(pos).name
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local near_node = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z})
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if near_node and string.find(near_node.name, "_loaded") then
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if fountainhead_name and fountainhead_name == "pipeworks:fountainhead" then
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minetest.add_node(pos,{name = "pipeworks:fountainhead_pouring"})
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if finitewater or abovename ~= "default:water_source" then
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minetest.add_node({x=pos.x,y=pos.y+1,z=pos.z},{name = "default:water_source"})
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end
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end
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else
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if fountainhead_name == "pipeworks:fountainhead_pouring" then
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minetest.add_node({x=pos.x,y=pos.y,z=pos.z},{name = "pipeworks:fountainhead"})
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if abovename == "default:water_source" and not finitewater then
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minetest.remove_node({x=pos.x,y=pos.y+1,z=pos.z})
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end
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end
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end
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end
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end
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-- borrowed from above: might be useable to replace the above coords tables
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local make_coords_offsets = function(pos, include_base)
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local coords = {
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{x=pos.x,y=pos.y-1,z=pos.z},
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{x=pos.x,y=pos.y+1,z=pos.z},
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{x=pos.x-1,y=pos.y,z=pos.z},
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{x=pos.x+1,y=pos.y,z=pos.z},
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{x=pos.x,y=pos.y,z=pos.z-1},
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{x=pos.x,y=pos.y,z=pos.z+1},
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}
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if include_base then table.insert(coords, pos) end
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return coords
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end
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-- new version of liquid check
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-- accepts a limit parameter to only delete water blocks that the receptacle can accept,
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-- and returns it so that the receptacle can update it's pressure values.
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-- this should ensure that water blocks aren't vanished from existance.
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pipeworks.check_for_liquids_v2 = function(pos, limit)
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if not limit then
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limit = 6
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end
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local coords = make_coords_offsets(pos, false)
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local total = 0
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for index, tpos in ipairs(coords) do
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if total >= limit then break end
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local name = minetest.get_node(tpos).name
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if name == "default:water_source" then
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minetest.remove_node(tpos)
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total = total + 1
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end
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end
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return total
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end
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local label_pressure = "pipeworks.water_pressure"
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local label_haspressure = "pipeworks.is_pressure_node"
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pipeworks.balance_pressure = function(pos, node)
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-- debuglog("balance_pressure() "..node.name.." at "..pos.x.." "..pos.y.." "..pos.z)
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-- check the pressure of all nearby nodes, and average it out.
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-- for the moment, only balance neighbour nodes if it already has a pressure value.
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-- XXX: maybe this could be used to add fluid behaviour to other mod's nodes too?
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-- unconditionally include self in nodes to average over
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local meta = minetest.get_meta(pos)
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local currentpressure = meta:get_float(label_pressure)
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meta:set_int(label_haspressure, 1)
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local connections = { meta }
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local totalv = currentpressure
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local totalc = 1
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-- then handle neighbours, but if not a pressure node don't consider them at all
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for _, npos in ipairs(make_coords_offsets(pos, false)) do
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local neighbour = minetest.get_meta(npos)
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local haspressure = (neighbour:get_int(label_haspressure) ~= 0)
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if haspressure then
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local n = neighbour:get_float(label_pressure)
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table.insert(connections, neighbour)
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totalv = totalv + n
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totalc = totalc + 1
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end
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end
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local average = totalv / totalc
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for _, targetmeta in ipairs(connections) do
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targetmeta:set_float(label_pressure, average)
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end
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end
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