Speeding up plotting widget

[Michael Pyne]

On Tuesday 10 June 2008, Uwe Thiem wrote:
> 2.
> bitBlt the buffer over into the widget instead of plotting in the
> widget.

bitBlt is gone in Qt 4.  You can still use drawPixmap if you've got a QPainter 
on a QPixmap though.

But painting is automatically double-buffered now, so this shouldn't buy you 
much (in theory).

One thing I forgot, though, is to scroll the already-drawn portion of the 
sensor over and just draw the 2 or so pixels which you've uncovered.  I'm not 
sure how to get the dashed lines to show up right though.

Regards,
 - Michael Pyne
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