title: how can I draw a real time plot by qt?
body: <p>I'm beginner and try to use QCustopPlot.
  I want to draw a real time chart.
  I use this example code.
  but I have so many questions:</p>
  
  <p>1) how can I fixed yAxis to a specific int number (0 to 50)</p>
  
  <p>2) how can I fixed xAxis? I mean I want to have a chart that in passing time, the plot moves. (not the xAxis or yAxis)</p>
  
  <p>sory for my bad language.</p>