Making a formula to calculate converting real time to ingame time?
I am generating a schedule for a school that requires automatically setting the ingame time as real time continues. So far, I have reached a wall on how to find the formula. Period 1 in real time starts at 4:30pm, and the ingame time has to be 7:00am. Period 8 in real time starts at 7:53pm, and the ingame time has to be 3:00pm. By making a script convert current time (0430P) to military time (1630)
function ConStM(timee) --Convert from Standard to Military
local addtime=false
if timee:sub(5):lower()=="p" then
addtime=true
end
timee=tonumber(timee:sub(1,4))
if addtime==true then
timee=timee+1200
end
return timee
end
print(ConStM("0430P"))
It returns 1630.
So 1630=0700 and 1900=1500.
I get stuck there, how am I going to find the function to that?
1630x=700 and 1900x=1500,
x=700-1630,
x=-930,
1900(-930)=1500,
-1767000=1500
That's not true.. What am I doing?
For example. If it's 4:30pm, it will be 7:00am ingame. If it's 6:13pm, it will be 11:00am ingame. If it's 8:15pm, it will be 3:00pm ingame. If it's earlier than 4:30pm, then it will be near 7:00am. If it's later than 8:15pm, then it will be near 3:00pm. Graph Example http://postimg.org/image/4klzbhim3/
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1 answer
First: you don't want to store military time. You want to store minutes-since-midnight.
Thus 1:00am is 60, 2:00am is 120, 12 noon is 720, 4p is 960, etc. This is easy to write:
-- Tolerant of many different time formats:
-- 1:00am
-- 1:00a
-- 100a
-- 100am
-- 13:00
-- 1:00p
-- 1:00p
-- 13:00a
-- Formula is governed by hours * 60 + minutes, just lots of work to
-- accept various forms of time formats
function convertMinutes(stamp)
if stamp:sub(-1):lower() == "m" then
return convertMinutes(stamp:sub(1, -2)) -- allow "pm" or "am" instead of just "p" or "a"
end
local half = stamp:sub(-1):lower()
if half == "p" then -- strip off
return 12 * 60 + convertMinutes(stamp:sub(1, -2))
elseif half == "a" then
return convertMinutes(stamp:sub(1, -2))
end
local hour = stamp:sub(1, -3):gsub("%D+", "")
local minute = stamp:sub(-2, -1)
return hour * 60 + minute
end
print(convertMinutes("1:00a"))
print(convertMinutes("01:00am"))
print(convertMinutes("1:00p"))
print(convertMinutes("1300"))
Unlike military time, this convention means that when one minute increases, the number will always increase by one, rather than by either 1 or 41.
We can compute a simple linear function:
local realStart = convertMinutes("4:30pm")
local realEnd = convertMinutes("8:00pm")
local gameStart = convertMinutes("7:00am")
local gameEnd = convertMinutes("3:30pm")
local realNow = -- (Get number of minutes since midnight)
local sinceRealStart = realNow - realStart
local dayProgress = sinceRealStart / (realEnd - realStart)
local gameNow = dayProgress * (gameEnd - gameStart) + gameStart
-- or all together:
local gameNow = (realNow - realStart) / (realEnd - realStart) * (gameEnd - gameStart) + gameStart
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