code: def scaleY(self, y):
          'returns plotter y coordinate'
          return round(self.plotviewBox.ymin+(y-self.visibleBox.ymin)*self.yScalerf scaleY(self, y):
          'returns plotter y coordinate'
          return round(self.plotviewBox.ymin+(y-self.visibleBox.ymin)*self.yScaler)
docs: returns plotter y coordinate