title: Qt5 QCustomPlot. Large graph in real time
body: <p>I am currently working on an application that plots data from ADC in real time. In some cases I have to plot about 150k points and it takes some time.
  So the problem is the data may arrive with higher frequency than I am able to plot it.</p>
  
  <p>I don't need high framerate. Also I can effort skipping some data.</p>
  
  <p>I am using: OS Windows 7, Qt 5.5, QCustomPlot.</p>
  
  <p>So question is: <strong>How exactly do I prevent re-plotting until previous re-plot is finished to keep the application responsive?</strong></p>
  
  <p>Thanks.</p>