Minetest-WorldEditAdditions/worldeditadditions/lib/metaballs/playerdata.lua

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local wea_c = worldeditadditions_core
local Vector3 = wea_c.Vector3
local metaballdata = {}
--- Adds a new metaball for a given player at the specified position with a specified radius.
-- @param player_name string The name of the player.
-- @param pos Vector3 The position of the metaball.
-- @param radius number The radius of the metaball.
-- @returns bool,number The number of metaballs now defined for the given player.
local function add(player_name, pos, radius)
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pos = Vector3.clone(pos)
if type(player_name) ~= "string" then
return false, "Error: Invalid player name specified."
end
if type(radius) ~= "number" then
return false, "Error: Expected the radius to be of type number, but got value of type "..type(radius).." instead."
end
if radius < 1 then
return false, "The minimum radius of a metaball is 1, but got a radius of "..tostring(radius).."."
end
if not metaballdata[player_name] then
metaballdata[player_name] = {}
end
-- TODO: Limit the number of metaballs that can be defined?
table.insert(metaballdata[player_name], {
pos = pos,
radius = radius
})
return true, #metaballdata[player_name]
end
--- Returns a list of all metaballs defined for the given player.
-- @param player_name string The name of the player.
-- @returns bool,[{ pos: Vector3, radius: number }, ...] A list of metaballs for the given player.
local function list(player_name)
if type(player_name) ~= "string" then
return false, "Error: Invalid player name specified."
end
if not metaballdata[player_name] then return {} end
return true, metaballdata[player_name]
end
--- Returns a pretty-printed list of metaballs for the given player.
-- @param player_name string The name of the player.
-- @returns bool,string A pretty-printed list of metaballs for the given player.
local function list_pretty(player_name)
local success, metaball_list = list(player_name)
if not success then return success, metaball_list end
if not metaball_list or type(metaball_list) ~= "table" then
return false, "Invalid metaball list returned"
end
local rows = { { "Index", "Position", "Radius" } }
for i,metaball in ipairs(metaball_list) do
table.insert(rows, {
i,
metaball.pos,
metaball.radius
})
end
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return true, wea_c.format.make_ascii_table(rows).."\n---------------------------\nTotal "..tostring(#metaball_list).." metaballs"
end
--- Removes the metaball with the specified index for a given player.
-- @param player_name string The name of the player.
-- @param index number The index of the metaball to remove.
-- @returns bool,number The number of metaballs now defined for the given player.
local function remove(player_name, index)
local success, metaball_list = list(player_name)
if not success then return success, metaball_list end
if not metaball_list or type(metaball_list) ~= "table" then
return false, "Invalid metaball list returned"
end
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if index > #metaball_list then
return false, "Error: Requested the removal of metaball "..tostring(index)..", but there are "..tostring(#metaball_list).." metaballs defined."
end
table.remove(metaball_list, index)
return true, #metaball_list
end
--- Removes all the currently defined metaballs for the given player.
-- @param player_name string The name of the player.
-- @returns bool,number The number of metaballs that WERE defined for the given player.
local function clear(player_name)
local success, metaball_list = list(player_name)
if not success then return success, metaball_list end
metaballdata[player_name] = {}
return #metaball_list
end
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--- Calculates the total volume that the currently defined metaballs are expected to take up.
-- @param player_name string The name of the player.
-- @returns bool,number The total volume that the currently defined metaballs are expected to take up.
local function volume(player_name)
local success, metaball_list = list(player_name)
if not success then return success, metaball_list end
if not metaball_list or not metaball_list[1] or type(metaball_list) ~= "table" then return false, "Error: Invalid metaball list returned" end
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if #metaball_list == 0 then return 0 end
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local pos1 = metaball_list[1].pos
local pos2 = pos1
for i,metaball in ipairs(metaball_list) do
pos1 = Vector3.min(pos1, metaball.pos - metaball.radius)
pos2 = Vector3.max(pos2, metaball.pos + metaball.radius)
end
return true, (pos2 - pos1):area()
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end
return {
add = add,
list = list,
list_pretty = list_pretty,
remove = remove,
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clear = clear,
volume = volume
}