code: function updateBoundaries() {
  
          var padding = 10;
  
          var innerPoints = getPointsByGroup('inner', padding);
          var outerPoints = getPointsByGroup('outer', padding);
  
          var innerHullPoints = convexHullAlgorithm(innerPoints);
          var innerBoundaryPoints = getPaddedPoints(innerHullPoints, padding);
          var outerHullPoints = convexHullAlgorithm(outerPoints.concat(innerBoundaryPoints));
  
          innerBoundary.attr('d', createData(innerHullPoints));
          outerBoundary.attr('d', createData(outerHullPoints));
      }
docs: Helpers