code: function growBounding(bounding, x, y) {
          if (x < bounding[0]) {
              bounding[0] = x;
          } else if (x > bounding[2]) {
              bounding[2] = x;
          }
  
          if (y < bounding[1]) {
              bounding[1] = y;
          } else if (y > bounding[3]) {
              bounding[3] = y;
          }
      }
docs: [minx,miny,maxx,maxy]