Example #1
0
        /// <summary>
        /// Returns the distance between two world coordinates (input is in degrees, so transformation in radians required)
        /// </summary>
        /// <returns></returns>
        public static float getDistance(float x1, float y1, float x2, float y2)
        {
            float X1 = Defibrilator.ToRadians(x1);
            float X2 = Defibrilator.ToRadians(x2);
            float Y1 = Defibrilator.ToRadians(y1);
            float Y2 = Defibrilator.ToRadians(y2);

            float XX       = (X2 - X1) * (float)Math.Cos((Y1 + Y2) / 2.0f);
            float YY       = Y2 - Y1;
            float distance = (float)Math.Sqrt(XX * XX + YY * YY) * 6371.0f;

            return(distance);
        }
Example #2
0
        public static void Main(string[] args)
        {
            // carefull with float parsing, some computers interpret ',' as separation, others the '.' (local settings matter)
            float myX = float.Parse(Console.ReadLine().Replace(',', '.')); //the longitude
            float myY = float.Parse(Console.ReadLine().Replace(',', '.')); //the latitude
            int   N   = int.Parse(Console.ReadLine());                     //nr. of defibrilators

            // read the defribrilators data and store it in a list
            List <Defibrilator> defribilators = new List <Defibrilator>();

            for (int i = 0; i < N; i++)
            {
                string   defString = Console.ReadLine();
                string[] defData   = defString.Split(new char[] { ';' });

                String       tempName = defData[1];
                float        tempX    = float.Parse(defData[4].Replace(',', '.'));
                float        tempY    = float.Parse(defData[5].Replace(',', '.'));
                Defibrilator d        = new Defibrilator(tempName, tempX, tempY);
                defribilators.Add(d);
            }

            // get the result by sorting the list using as criteria the distance between the points and the user position
            //we use lambda expression, for demonstration purposes
            String result = defribilators.OrderBy(x => x,
                                                  Comparer <Defibrilator> .Create(
                                                      (d1, d2) =>
            {
                float dist1 = Defibrilator.getDistance(d1.X, d1.Y, myX, myY);
                float dist2 = Defibrilator.getDistance(d2.X, d2.Y, myX, myY);

                return(dist1 == dist2 ? 0 : (dist1 < dist2 ? -1 : 1));
            }
                                                      )).ToList()[0].Name;

            Console.WriteLine(result);

            Console.ReadKey();
        }