started removing KLib related code:

- assertions
- distributions
new helper methods
worked on stairs
worked on grid-walkers
worked on navigation

math/distribution/Normal.h

@@ -0,0 +1,57 @@
+#ifndef NORMAL_H
+#define NORMAL_H
+
+#include <cmath>
+#include <random>
+
+namespace Distribution {
+
+	/** normal distribution */
+	template <typename T> class Normal {
+
+	private:
+
+		const T mu;
+		const T sigma;
+		const T _a;
+
+		std::minstd_rand gen;
+		std::normal_distribution<T> dist;
+
+	public:
+
+		/** ctor */
+		Normal(const T mu, const T sigma) :
+			mu(mu), sigma(sigma), _a(1.0 / (sigma * std::sqrt(2.0 * M_PI))), gen(1234), dist(mu,sigma) {
+
+		}
+
+		/** get probability for the given value */
+		T getProbability(const T val) const {
+			const T b = -0.5 * ((val-mu)/sigma) * ((val-mu)/sigma);
+			return _a * std::exp(b);
+		}
+
+		/** get a normally distributed random number */
+		T draw() {
+			return dist(gen);
+		}
+
+		/** set the seed to use */
+		void setSeed(const long seed) {
+			gen.seed(seed);
+		}
+
+
+		/** get the probability for the given value */
+		static T getProbability(const T mu, const T sigma, const T val) {
+			const T a = 1.0 / (sigma * std::sqrt(2.0 * M_PI));
+			const T b = -0.5 * ((val-mu)/sigma) * ((val-mu)/sigma);
+			return a * std::exp(b);
+		}
+
+	};
+
+}
+
+#endif // NORMAL_H