code: def gen_gradient(args, resource, inflow, radius, loc, common=True):
      
      return "".join(["GRADIENT_RESOURCE ", str(resource), ":height=",
                      str(radius), ":plateau=", str(inflow), ":spread=",
                      str(radius-1), ":common=", str(int(common)),
                      ":updatestep=1000000:peakx=", str(loc[0]), ":peaky=",
                      str(loc[1]), ":plateau_inflow=", str(inflow), ":initial=",
                      str(inflow) + "\n"])
docs: Returns a line of text to add to an environment file, initializing a
      gradient resource with the specified
      name (string), inflow(int), radius(int), and location (tuple of ints)