title: QwtPlot: making last plotted point look in a different color or size
body: <p>I have a system which is drawing points into a QwtPlot. What I want is getting the last plotted point at any time plotted in a different color, so I can always know which has been the last plotted point by the moment.</p>
  
  <p>Is there any direct way of doing this, or how could I approach this?</p>