code: def scaleX(self, x):
          'returns plotter x coordinate'
          return round(self.plotviewBox.xmin+(x-self.visibleBox.xmin)*self.xScalerf scaleX(self, x):
          'returns plotter x coordinate'
          return round(self.plotviewBox.xmin+(x-self.visibleBox.xmin)*self.xScaler)
docs: returns plotter x coordinate