fCraft.Drawing.DrawOperation.LineEnumerator C# (CSharp) Method

        protected static IEnumerable<Vector3I> LineEnumerator( Vector3I a, Vector3I b )
        {
            Vector3I pixel = a;
            Vector3I d = b - a;
            Vector3I inc = new Vector3I( Math.Sign( d.X ),
                                         Math.Sign( d.Y ),
                                         Math.Sign( d.Z ) );
            d = d.Abs();
            Vector3I d2 = d * 2;

            int x, y, z;
            if ( ( d.X >= d.Y ) && ( d.X >= d.Z ) ) {
                x = 0;
                y = 1;
                z = 2;
            } else if ( ( d.Y >= d.X ) && ( d.Y >= d.Z ) ) {
                x = 1;
                y = 2;
                z = 0;
            } else {
                x = 2;
                y = 0;
                z = 1;
            }

            int err1 = d2[y] - d[x];
            int err2 = d2[z] - d[x];
            for ( int i = 0; i < d[x]; i++ ) {
                yield return pixel;
                if ( err1 > 0 ) {
                    pixel[y] += inc[y];
                    err1 -= d2[x];
                }
                if ( err2 > 0 ) {
                    pixel[z] += inc[z];
                    err2 -= d2[x];
                }
                err1 += d2[y];
                err2 += d2[z];
                pixel[x] += inc[x];
            }

            yield return b;
        }