docs: public static boolean isConvex(double[] data, int points)
      {
          if (points < 3)
          {
              return true;
          }
          for (int i1 = 0; i1 < points; i1++)
          {
              int i2 = (i1 + 1) % points;
              int i3 = (i2 + 1) % points;
              double x1 = data[2 * i1];
              double y1 = data[2 * i1 + 1];
              double x2 = data[2 * i2];
              double y2 = data[2 * i2 + 1];
              double x3 = data[2 * i3];
              double y3 = data[2 * i3 + 1];
              if (Vectors.isClockwise(x1, y1, x2, y2, x3, y3))
              {
                  return false;
              }
          }
          return true;
      }