class_docstr: Gauge graph class
class_docstr_tok: ["Gauge","graph","class"]
docstr: Compute y min and max and y scale and set labels
docstr_tok: ["Compute","y","min","and","max","and","y","scale","and","set","labels"]
code: def _compute(self):
      """Compute y min and max and y scale and set labels"""
      self.min_ = self._min or 0
      self.max_ = self._max or 0
      if self.max_ - self.min_ == 0:
          self.min_ -= 1
          self.max_ += 1
  
      self._box.set_polar_box(0, 1, self.min_, self.max_)
  
file_path: pygal/pygal/graph/gauge.py
imports: from pygal.graph.graph import Graph
  from pygal.util import alter, compute_scale, cut, decorate
  from pygal.view import PolarThetaLogView, PolarThetaView
label_desc: Use image node_id 5 for calling the Gauge obj's underlying member method code with example usage: obj._compute() without return types