docs: private static double[] getStartEndPointsWE(double west, double east, int zoom) {
  
          double incrementor = getIncrementor(zoom);
          //brute force when zoom is less than 10
          if (zoom < 10) {
              double we_startpoint = Math.floor(west);
              double x = 180;
              while (x > we_startpoint)
                  x = x - incrementor;
              we_startpoint = x;
              //System.out.println("WS " + we_startpoint);
              double ws_stoppoint = Math.ceil(east);
              x = -180;
              while (x < ws_stoppoint)
                  x = x + incrementor;
              if (we_startpoint < -180) {
                  we_startpoint = -180;
              }
              if (ws_stoppoint > 180) {
                  ws_stoppoint = 180;
              }
              return new double[]{ws_stoppoint, we_startpoint};
          } else {
              //hmm start at origin, add inc until we go too far, then back off, go to the next zoom level
              double west_start_point = -180;
              if (west > 0) {
                  west_start_point = 0;
              }
              double easter_stop_point = 180;
              if (east < 0) {
                  easter_stop_point = 0;
              }
  
              for (int xx = 2; xx <= zoom; xx++) {
                  double inc = getIncrementor(xx);
                  while (easter_stop_point > east + inc) {
                      easter_stop_point -= inc;
                      //System.out.println("east " + easter_stop_point);
                  }
  
                  while (west_start_point < west - inc) {
                      west_start_point += inc;
                      if (DEBUG) {
                          System.out.println("west " + west_start_point);
                      }
                  }
              }
              if (DEBUG) {
                  System.out.println("return EW set as " + west_start_point + " " + easter_stop_point);
              }
              return new double[]{easter_stop_point, west_start_point};
          }
      }