Measurement "cursors"

[Murphy, S. <sm...@wa...>]

I'm trying to figure out what class(es) I need to use to implement the 
following on a QwtPlot:

1. I want two vertical "cursors" on a plot. At minimum it just needs to 
  be a vertical  line. I think it could just be a QwtPlotMarker, but not 
  sure if that works for the remaining requirements
2. User can click and drag on a cursor to move it horizontally. When user 
  releases the mouse button, the cursor remains at that released position
3. Ideally, cursors emit their position as they are being moved. I really just 
  need the  x() portion of that position, but it's fine if it emits a 
  QPoint/QPointF, I can always disregard the y() component

Requirement 2 is the part I haven't figured out yet - how do I allow the 
user to grab a plot item to move it? I think maybe for that I want to look
at QwtPicker?

The idea behind this is setting up measurement bars like an 
oscilloscope would have allowing the user to make measurements 
between the two different points on all the displayed curves.

Sean


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