Re: gEDA-user: Bug in 'FreeRotateBuffer()'? (WAS: Re: Line Thickness in Imported DXF Files; Rotating by Arbitrary Angle; UTF-8)

[Andrew Poelstra <asp11@xxxxxx>]

On Mon, Aug 15, 2011 at 11:29:59AM -0700, Colin D Bennett wrote:
> On Mon, 15 Aug 2011 15:50:23 +0200
> Kai-Martin Knaak <knaak@xxxxxxxxxxxxxxxxxxx> wrote:
> 
> > Gus Fantanas wrote:
> > 
> > > Is it a bug or 
> > > did I do something wrong when I created the footprint? 
> > 
> > It is half a bug. Exactly square pads are defined by two points that 
> > coincide. There is no orientation attached to this. So PCB assumes
> > the square shape should be aligened along the axis of the grid. After
> > the rotation transform was applied to the two points, they still
> > coincide. Consequently PCB insists to render them like before.
> > 
> > The work-around is to make the pads slightly non-square. Then 
> > There are rounding glitches, though. If the two points differ by too 
> > little distance, the resulting shape renders not quite in the
> > expected angle.
> 
> Because of this bug (it is completely a bug from the user's point of
> view), as you suggested I always make my nominally-square pads slightly
> non-square.  Usually by +/- 0.01 mil or +/- 0.02 mil, but that might not
> be enough for good rotation... hopefully nanometer conversion will
> improve that significantly with no extra effort for us footprint
> designers.
>

The problem is that the file-format still saves in cmils. (You can
use a text-editor to put the new units in, but then you have problems
with backward-compatibility.)

But I second "this is a bug". It is just a bug with no non-breaking
solution.

-- 
Andrew Poelstra
Email: asp11 at sfu.ca OR apoelstra at wpsoftware.net
Web:   http://www.wpsoftware.net/andrew/



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