docs: def set_logscale(self, xscale='linear', yscale='linear',
                       delay_draw=False):
          "set log or linear scale for x, y axis"
          self.xscale = xscale
          self.yscale = yscale
          for axes in self.canvas.figure.get_axes():
              try:
                  axes.set_yscale(yscale, basey=10)
              except:
                  axes.set_yscale('linear')
              try:
                  axes.set_xscale(xscale, basex=10)
              except:
                  axes.set_xscale('linear')
          if not delay_draw:
              self.process_data()