[Qt-interest] QGraphicsView and vertical/horizontal lines which do not display

[Cecilia Castillo]

Sean -

Thanks for your reply.  It turns out that the problem was with my 
bounding box.  When my nodes were vertical/horizontal, the bounding 
box had no area.  I had been adding some space around my line by 
using a portion of the pen size, but when I changed to a cosmetic pen 
(with a size of 0)...the bounding box no longer had area.

Regards,
   Cecilia

>Hi,
>
>Cecilia Castillo wrote:
>>  When I display my initial set of points and lines, if the lines are
>>  exactly vertical or horizontal, they sometimes do not display.  If I
>>  move a point which causes the line to be off vertical or horizontal,
>>  the line appears.  If I move the point back and the line goes
>>  vertical/horizontal...the line disappears.
>>  
>I have seen this on occasion too. In my case, disabling antialiasing for
>those objects that are vertical or horizontal lines seemed to fix the issue.
>
>Worth a try.
>
>Sean
>
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