cambridge/funcs.lua

69 lines
1.7 KiB
Lua

function copy(t)
-- returns deep copy of t (as opposed to the shallow copy you get from var = t)
if type(t) ~= "table" then return t end
local meta = getmetatable(t)
local target = {}
for k, v in pairs(t) do target[k] = v end
setmetatable(target, meta)
return target
end
function strTrueValues(tbl)
-- returns a concatenation of all the keys in tbl with value true, separated with spaces
str = ""
for k, v in pairs(tbl) do
if v == true then
str = str .. k .. " "
end
end
return str
end
function frameTime(min, sec, hth)
-- returns a time in frames from a time in minutes-seconds-hundredths format
if min == nil then min = 0 end
if sec == nil then sec = 0 end
if hth == nil then hth = 0 end
return min*3600 + sec*60 + math.ceil(hth * 0.6)
end
function vAdd(v1, v2)
-- returns the sum of vectors v1 and v2
return {
x = v1.x + v2.x,
y = v1.y + v2.y
}
end
function vNeg(v)
-- returns the opposite of vector v
return {
x = -v.x,
y = -v.y
}
end
function formatTime(frames)
-- returns a mm:ss:hh (h=hundredths) representation of the time in frames given
if frames < 0 then return formatTime(0) end
local min, sec, hund
min = math.floor(frames/3600)
sec = math.floor(frames/60) % 60
hund = math.floor(frames/.6) % 100
str = string.format("%02d:%02d.%02d", min, sec, hund)
return str
end
function formatBigNum(number)
-- returns a string representing a number with commas as thousands separator (e.g. 12,345,678)
local s = string.format("%d", number)
local pos = string.len(s) % 3
if pos == 0 then pos = 3 end
return string.sub(s, 1, pos)
.. string.gsub(string.sub(s, pos+1), "(...)", ",%1")
end
function Mod1(n, m)
-- returns a number congruent to n modulo m in the range [1;m] (as opposed to [0;m-1])
return ((n-1) % m) + 1
end