Random function help please.

[Mason-]

I'm making an asteroid belt for my project it consists of a lot of objects that are random put 300 pixels from the sun then add Math.random() * 300 so that it will randomly be between 300-600 distance away from the sun. However I wanted it to be less far away and more nearer to the sun, so I did the following:

300 + Math.random()*300*Math.random()

Therefore it is less likely to be nearer to 600 and more likely to be nearer to 300.

What I want now is for there to be lots in the middle of the range 300-600 and less near the sun and less far away but I can't get my head around how to do it.

Any help would be appreciated, cheers.

EDIT:

Wow, the second I stopped writing I figured it out.

if (Math.random() < 0.5)
{
450 + Math.random() * 150 * Math.random()
}
else
{
450 - Math.random() * 150 * Math.random()
}

 

[Mason-]

Just use a normal distribution.

See my edit, it's fine now.

Looks like this now ^^

 

[Mason-]

Thanks man! There's way more to it, (it's animated) and loads of different modes.

Obviously the art side of it is terrabad but it's a computer science degree not an art degree ^^ .

 

[Mason-]

The speed is randomly generated. So some do some don't.

 

[Mason-]

I had a rethink of this the other day, pointless bump but in case anyone was wondering.

You could do something along the lines of
//would return a number between 1 and -1 multiplied by the range
// e.g. range = 3. between 3 and -3.
Math.sin(Math.random() * 2 * Math.pi) * range

It's one line rather than a conditional. Then you could also times it all by Math.random() again if you wished to make things more likely to be closer to the middle ^^