code: def convexhull(data, col, fill=True, point_size=4):
      """
      Convex hull for a set of points
  
      :param data: points
      :param col: color
      :param fill: whether to fill the convexhull polygon or not
      :param point_size: size of the points on the convexhull. Points are not rendered if None
      """
      from geoplotlib.layers import ConvexHullLayer
  
      _global_config.layers.append(
          ConvexHullLayer(data, col, fill, point_size)
      )
  
imports: import base64
  import traceback
  import pyglet
  from geoplotlib.core import GeoplotlibApp
  from core import FONT_NAME
label_desc: Use image node_id 12 for calling a global function with example usage: convexhull(data, col, fill, point_size) without return types