code: def scaleY(self, canvasY):
          'returns plotter y coordinate, with y-axis inverted'
          plotterY = super().scaleY(canvasY)
          return (self.plotviewBox.ymax-plotterY+4f scaleY(self, canvasY):
          'returns plotter y coordinate, with y-axis inverted'
          plotterY = super().scaleY(canvasY)
          return (self.plotviewBox.ymax-plotterY+4)
docs: returns plotter y coordinate, with y-axis inverted