class_docstr: Chart boundings
class_docstr_tok: ["Chart","boundings"]
docstr: Helper for polar charts
docstr_tok: ["Helper","for","polar","charts"]
code: def set_polar_box(self, rmin=0, rmax=1, tmin=0, tmax=2 * pi):
      """Helper for polar charts"""
      self._rmin = rmin
      self._rmax = rmax
      self._tmin = tmin
      self._tmax = tmax
      self.xmin = self.ymin = rmin - rmax
      self.xmax = self.ymax = rmax - rmin
  
imports: from __future__ import division
  from math import cos, log10, pi, sin
label_desc: Use image node_id 2 for calling the Box obj's underlying member method code with example usage: obj.set_polar_box(rmin, rmax, tmin, tmax) without return types