Constructs a seed (for pseudo-random number generation purposes) using an (x,y) coordinate and third random seed. - CSharp System

CSharp examples for System:Math Number

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Description

Constructs a seed (for pseudo-random number generation purposes) using an (x,y) coordinate and third random seed.

Demo Code


using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;//from ww  w.  ja v  a2s .  com

public class Main{
        /// <summary>
        /// Constructs a seed (for pseudo-random number generation purposes)
        /// using an (x,y) coordinate and third random seed.  The idea is
        /// to make the seeds different for a fixed random seed as x and y
        /// vary locally.
        /// 
        /// The chosen method is to take the least-significant (aka "local")
        /// half of both x and y, and concatenate them as uints.  Then add
        /// randomSeed (also as a uint), cast it back to an int, and return it.
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <param name="randomSeed"></param>
        /// <returns></returns>
        public static int MakeSeed(int x, int y, int randomSeed)
        {
            //parens!  But no, this is really (least sig half of x) concatenated with (least sig half of y)
            //then translated by randomseed
            unchecked
            {
                return (int)(((uint)randomSeed) + ((((uint)x) & cutOff) << 16) + (((uint)y) & cutOff));
            }
        }
}

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