I am looking for a random number generator in actionscript 3.0 that i can seed. The Math.random() does not have this functionality.
Thanks.
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2 Answers
I mostly use this seeded random function, which is very fast.
var seed:int = 777;
const MAX_RATIO:Number = 1 / int.MAX_VALUE;
const MIN_MAX_RATIO:Number = -MAX_RATIO;
function random():Number
{
seed ^= (seed << 21);
seed ^= (seed >>> 35);
seed ^= (seed << 4);
if (seed > 0) return seed * MAX_RATIO;
return seed * MIN_MAX_RATIO;
}
sources:
http://blog.stroep.nl/2012/07/random-seed-actionscript/
http://en.wikipedia.org/wiki/Linear_congruential_generator
7 Comments
mika
the link is dead. Could you explain a bit more about your answer? The other upvoted solution uses a bitmap data with perlin noise. I'm sure there must be something cleaner.
Mark Knol
I added a link to my blog, with a simple example how to use this. Basically it shifts around numbers, which gives random seeming values, but in the same order if you use the same seed.
Jeroen de Lau
Is this supposed to only return negative numbers? When using this I had to change the second to last line from seed < 0 to seed > 0.
Mark Knol
It is supposed to return a Number between 0-1. I updated the code in the answer to
if (seed > 0), not sure why I had the < 0 in the first place..Mark Knol
Now that is a helpful comment
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