How do I make a pair of math.random() generated numbers not repeat itself?
I have a very successful mini-game script part that I've worked on which is:
function InsertColor()
for i, v in pairs (game.Players:GetPlayers()) do
local PlayerColor = Instance.new("Color3Value")
PlayerColor.Parent = v.Character
PlayerColor.Name = "Color"
PlayerColor.Value = Color3.new(math.random(), math.random(), math.random())
TweenColorScreen()
end
end
Each player would be given a random color: eg: 200, 8, 15 which would be a red dominant color
Out of the thousands of permutations possible, how do I make someone in one game not have the same color as someone else so that there could be only one winner?
Thank You.
1 answer
First off I would like to say it is important to include the following at the top of your script:
math.randomseed(os.time());
This makes the random numbers even more random.
Then add this: (sorry for weird formatting, I am typing this in web browser and not in an editor)
So basically what you wanna do is store all the random colors in a table, and when you generate a color, you want to check and see if it is already in use.
local colors = {};
function IsInTable(Table,Item)
for i = 1, #Table, 1 do
if (Table[i] == Item) then
return true;
end
end
return false;
end
function GenrateRandomColor()
local color = Color3.new(math.random(),math.random(),math.random());
while true do
if (IsInTable(colors,color) then
-- Another player already has this color
color = Color3.new(math.random(),math.random(),math.random());
else
return color;
end
end
end
function InsertColor()
for i, v in pairs (game.Players:GetPlayers()) do
local PlayerColor = Instance.new("Color3Value")
PlayerColor.Parent = v.Character
PlayerColor.Name = "Color"
local RandomColor = GenrateRandomColor();
PlayerColor.Value = Color3.new(RandomColor.r, RandomColor.g, RandomColor.b)
TweenColorScreen()
end
end
EDIT: I left out a wait(); at line 14 because it is unlikely you will need to iterate more than once to find a unique random color.
So recap:
- Use math.randomseed(os.time()) to ensure your numbers are actually random
- In the extremely unlikely case that a player will get the same three multi digit / decimal random numbers as someone else, keep track of all the colors and check whether or not it has been used yet, if so generate a new one and repeat.
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