Random numbers
Setup
In this example you’ll learn how to generate pseudo-random numbers in Defold using built-in math API.
In the example there is only a game object containing:
- Label component where we show the text information
- Script component where we generate random numbers
Script sets the built-in random generator with a value of os.time() - which should be different every time you run it. Then produces 3 random numbers using math.random().
For more details refer to Defold API: https://defold.com/ref/stable/math-lua/#math.random:m-n
Scripts
random_numbers.script
function init(self)
local seed = os.time()
math.randomseed(seed) -- <1>
label.set_text("#label", "Seed: " .. seed
.. "\nRandom number (0 - 1): " .. math.random() -- <2>
.. "\nRandom integer (1 - 100): " .. math.random(100) -- <3>
.. "\nRandom integer (-10 - 0): " .. math.random(-10,0)) -- <4>
end
--[[
1. First, set the randomseed. It can be specific, if you always want to generate same numbers,
otherwise you can utilise e.g. os.time, like in the example to make it different each time.
2. math.random() with no arguments - generates a random floating point number between 0-1.
3. math.random(X) with one argument - generates an integer between 1 - X.
4. math.random(X, Y) with two arguments - generates an integer between X - Y.
--]]