[feature request] Randomizer

Isometric God · Post by **Isometric God** » Tue Apr 04, 2006 11:27 pm

As the topic says, I find it very cool to have Randomizer accessible. The change in source code is very little and there are no disadvantages at all. Can this be done ?

Aldo · Post by **Aldo** » Wed Apr 05, 2006 3:59 pm

There's one already.
Here's an example I am using to place models randomly, like trees, in a 10.000x10.000 units square:

Code: Select all

#include <time.h>
int main()
{
 srand((unsigned)time(NULL));
 f32 randomX = rand()%10000;
 f32 randomZ = rand()%10000;
 printf("X = %f\nZ =%f",randomX,randomZ); 
 return 0;
}

hybrid · Post by **hybrid** » Wed Apr 05, 2006 4:08 pm

Sure, and now some portable, OS independent wrapper. I guess this is what Isometric God meant. Just like the ITimer which hides os dependent techniques. I guess this is merely API definition, so just make some proposals.

Aldo · Post by **Aldo** » Fri Apr 07, 2006 6:23 pm

The rand() example above is portable, at least it works for me on wondows and linux. Can't say for others

hybrid · Post by **hybrid** » Fri Apr 07, 2006 9:22 pm

Ok, MSDN says it's also included in the stdlib.h on MS systems, you're right. It just differs in RAND_MAX in several versions, if not all. But that should be a minor problem.

Aldo · Post by **Aldo** » Sat Apr 08, 2006 6:10 am

Yes this function is ANSI-C thus supposed to be platform-independant.
http://www.cplusplus.com/ref/cstdlib/rand.html

hybrid · Post by **hybrid** » Sat Apr 08, 2006 9:11 am

But knowing which parts are part of ANSI C and which are just part of POSIX is sometimes quite hard. Furthermore, the difference with wsprintf (need a length parameter or not) had been fixed in ISO C for quite a while, but Microsoft using the old version still for many years. So you often have to work around small API differences.

roninmagus · Post by **roninmagus** » Mon Apr 10, 2006 1:41 pm

Not to toot my own horn but...

DustyEngine Randgen

hehe

Just a wrapper for rand() but works on every platform I've used.

bitplane · Post by **bitplane** » Mon Apr 10, 2006 2:21 pm

jam's sequence generator should give the same results on any system-
http://irrlicht.sourceforge.net/phpBB2/ ... hp?t=11749
much better than rand if you're procedurally making things and you want them to look the same every time