def create_plot( self ):
plot = Qwt.QwtPlot(self)
plot.setCanvasBackground(Qt.black)
plot.setAxisTitle(Qwt.QwtPlot.xBottom, 'Time')
plot.enableAxis( Qwt.QwtPlot.yLeft, True )
zoomer = Qwt.QwtPlotMagnifier( plot.canvas() )
zoomer.setAxisEnabled(Qwt.QwtPlot.xBottom,False )
self.plot = plot
return plot
