bell shaped random function - VERGE, Free 2d Game Engine

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bell shaped random function

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gannon

I made a little function that gives you a random number with the distribution shaped like a bell. (The numbers in the middle are more likly)

int randomBell(int a,int b)


{


	if(a < b)


		return (Random(a/2,b/2)+Random((a/2) + (a%2),(b/2) + (b%2)));


	return (Random(b/2,a/2)+Random((b/2) + (b%2),(a/2) + (a%2)));


}

Posted on 2005-02-11 16:50:24

gannon

Sorry for double posting but I made a more advanced version.
Just increase type to have it have a skinnier bell. 2 is the same as the old random bell.

int randomBell(int a,int b, int type)


{


	int result;


	int offset;


	int multi = 1;


	if(a > b)


	{


		result = b;


		b = a;


		a = result;


	}


	if(a < 0)


	{


		if(b < 0)


		{


			result = b;


			b = a * (0-1);


			a = result * (0-1);


			multi = 0-1;


		}


		else


		{


			offset = a;


			a = 0;


			b = b - offset;


		}


	}





	result = 0;


	int i;


	int a_odd = a%type;


	int b_odd = b%type;





	for(i = 0; i =< type; i++)


	{


		result += Random(a/type + lessthan(i,a_odd),b/type + lessthan(i,b_odd));


	}


	return (result + offset * multi);





}





int lessthan(int a, int b)


{


	if(a < b)


	{


		return 1;


	}


	return 0;


}

now works with neg numbers :)

Posted on 2005-02-11 19:04:01 (last edited on 2005-02-11 22:27:35)

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