forgot to add random number generators to repo

git-svn-id: https://projectm.svn.sourceforge.net/svnroot/projectm/trunk@813 6778bc44-b910-0410-a7a0-be141de4315d

src/projectM-engine/RandomNumberGenerators.cpp

@@ -0,0 +1,19 @@
+#fndef RANDOM_NUMBER_GENERATORS_HPP
+#define RANDOM_NUMBER_GENERATORS_HPP
+#include <cmath>
+
+namespace RandomNumberGenerators {
+
+double gaussian( double min = 0, double max=1, double sigma=1, double mean=.5)
+{
+	double random = (min + (max-min) * (double)rand()/RAND_MAX); //create random domain between [min,max]
+	double tmp = (random-mean)/sigma;
+	double gauss= exp(-tmp*tmp/2); //gaussian formula
+	
+	return gauss;
+}
+	
+	
+}
+
+#endif

src/projectM-engine/RandomNumberGenerators.hpp

@@ -0,0 +1,55 @@
+#ifndef RANDOM_NUMBER_GENERATORS_HPP
+#define RANDOM_NUMBER_GENERATORS_HPP
+#include <cmath>
+
+namespace RandomNumberGenerators {
+
+inline float uniform()
+/* Uniform random number generator x(n+1)= a*x(n) mod c
+				with a = pow(7,5) and c = pow(2,31)-1.
+				Copyright (c) Tao Pang 1997. */
+	{
+		const int ia=16807,ic=2147483647,iq=127773,ir=2836;
+		int il,ih,it;
+		float rc;
+		static int iseed = rand();
+		ih = iseed/iq;
+		il = iseed%iq;
+		it = ia*il-ir*ih;
+		if (it > 0)
+		{
+			iseed = it;
+		}
+		else
+		{
+			iseed = ic+it;
+		}
+		rc = ic;
+		return iseed/rc;
+	}
+
+inline float gaussian(float mean, float sigma)
+{
+
+	float x1, x2, w, y1, y2;
+ 
+	do {
+		x1 = 2.0 * uniform() - 1.0;
+		x2 = 2.0 * uniform() - 1.0;
+		w = x1 * x1 + x2 * x2;
+	} while ( w >= 1.0 );
+
+	w = sqrt( (-2.0 * log( w ) ) / w );
+	y1 = x1 * w;
+	y2 = x2 * w;
+	
+	float ret = y1*sigma + mean;
+
+	return ret;
+}
+	
+	
+}
+
+
+#endif