64 lines
1.8 KiB
Lua
64 lines
1.8 KiB
Lua
local mod_player_monoids = minetest.get_modpath("player_monoids") ~= nil
|
|
local mod_playerphysics = minetest.get_modpath("playerphysics") ~= nil
|
|
|
|
local utility = {}
|
|
|
|
function utility.rangelim(value, min, max)
|
|
return math.min(math.max(value, min), max)
|
|
end
|
|
|
|
-- from https://stackoverflow.com/a/29133654
|
|
-- merges two tables together
|
|
-- if in conflict, b will override values of a
|
|
function utility.merge_tables(a, b)
|
|
if type(a) == "table" and type(b) == "table" then
|
|
for k,v in pairs(b) do
|
|
if type(v)=="table" and type(a[k] or false)=="table" then
|
|
utility.merge_tables(a[k],v)
|
|
else a[k]=v end
|
|
end
|
|
end
|
|
return a
|
|
end
|
|
|
|
-- see https://en.wikipedia.org/wiki/Logistic_function
|
|
function utility.logistic_growth(value, max, growth, midpoint)
|
|
return max / (1 + math.exp(-growth * (value - midpoint)))
|
|
end
|
|
|
|
-- generates a wave of cycle length 1
|
|
-- maps parameters to values between 0 and 1
|
|
-- 0 is mapped to 0 and 0.5 to 1
|
|
function utility.normalized_cycle(value)
|
|
return math.cos((2 * value + 1) * math.pi) / 2 + 0.5
|
|
end
|
|
|
|
-- override player physics
|
|
-- use utility mod if possible to avoid conflict
|
|
function utility.add_physics(id, player, effect, value)
|
|
if mod_player_monoids then
|
|
player_monoids[effect]:add_change(player, value, id)
|
|
elseif mod_playerphysics then
|
|
playerphysics.add_physics_factor(player, effect, id, value)
|
|
else
|
|
local override = {}
|
|
override[effect] = value
|
|
player:set_physics_override(override)
|
|
end
|
|
end
|
|
|
|
-- reset player phsysics to normal
|
|
function utility.remove_physics(id, player, effect)
|
|
if mod_player_monoids then
|
|
player_monoids[effect]:del_change(player, id)
|
|
elseif mod_playerphysics then
|
|
playerphysics.remove_physics_factor(player, effect, id)
|
|
else
|
|
local override = {}
|
|
override[effect] = 1
|
|
player:set_physics_override(override)
|
|
end
|
|
end
|
|
|
|
return utility
|