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Add new vector utils (ceil, sign, abs, random_in_area) (#14807)

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kromka-chleba 2024-08-31 09:43:52 +00:00 • committed by GitHub
parent 3971b6afcc
commit a6ba5304c4
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10 changed files with 143 additions and 52 deletions
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42
builtin/common/misc_helpers.lua
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@ -3,6 +3,7 @@
--------------------------------------------------------------------------------
-- Localize functions to avoid table lookups (better performance).
local string_sub, string_find = string.sub, string.find
local math = math
--------------------------------------------------------------------------------
local function basic_dump(o)
@ -220,47 +221,6 @@ function string:trim()
return self:match("^%s*(.-)%s*$")
end
--------------------------------------------------------------------------------
function math.hypot(x, y)
return math.sqrt(x * x + y * y)
end
--------------------------------------------------------------------------------
function math.sign(x, tolerance)
tolerance = tolerance or 0
if x > tolerance then
return 1
elseif x < -tolerance then
return -1
end
return 0
end
--------------------------------------------------------------------------------
function math.factorial(x)
assert(x % 1 == 0 and x >= 0, "factorial expects a non-negative integer")
if x >= 171 then
-- 171! is greater than the biggest double, no need to calculate
return math.huge
end
local v = 1
for k = 2, x do
v = v * k
end
return v
end
function math.round(x)
if x < 0 then
local int = math.ceil(x)
local frac = x - int
return int - ((frac <= -0.5) and 1 or 0)
end
local int = math.floor(x)
local frac = x - int
return int + ((frac >= 0.5) and 1 or 0)
end
local formspec_escapes = {
["\\"] = "\\\\",
["["] = "\\[",