I am trying to use QPainterPath to render a graph.  I draw an x and a y axis in 
blue, then use moveTo and QuadTo to draw a curve which crosses over the x axis. 
 What I see is that the quadTo operation erases some of my blue x-axis pixels, 
specifically the pixels between the curve and where a straight line between the 
endpoints would connect.

Am I using QPainterPath wrongly?  Is there any way I can do the quadTo() such 
that it won't overwrite pixels which are not under the final curve it actually 
draws.  It's erasing too many pixels.

- VStevenP
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