jSignature.Tools.Base30Converter.CompressStrokeLeg C# (CSharp) Method

        private string CompressStrokeLeg(int[] val)
        {
            StringBuilder sb = new StringBuilder();

            char polarity = PLUS;

            foreach (int num in val)
            {
                //Put the number into base30 format
                List<int> cell = ToBase30(Math.Abs(num));

                //If the polarity has changed, then we need to lay down a polarity indicator
                char newpolarity;
                if (num == 0) newpolarity = polarity;  //Zero indicates no change in polarity
                else newpolarity = (num >= 0) ? PLUS : MINUS;
                if (newpolarity != polarity)
                {
                    sb.Append(newpolarity);
                    polarity = newpolarity;
                }

                //Now convert into the jSignature Base30 compressed format
                for (int i = 0; i < cell.Count; i++)
                {
                    //The first "bitness" characters in the character set are used for the first member of the
                    //number representation.  If the number representation has more than 1 character, the
                    //offset in the character set is shifted by "bitness"
                    int charsetoffset = (i > 0) ? bitness : 0;
                    sb.Append(ALLCHARS[cell[i] + charsetoffset]);
                }
            }

            return sb.ToString();
        }