Re: gEDA-user: gEDA-dev: Arc intersection connectivity bug

[Peter TB Brett <peter@xxxxxxxxxxxxx>]

On Fri, 13 Nov 2009 09:13:08 +0000, Ineiev <ineiev@xxxxxxxxx> wrote:
> On 11/13/09, Gabriel Paubert <paubert@xxxxxxx> wrote:
>> On Fri, Nov 13, 2009 at 01:42:33AM +0000, Peter Clifton wrote:
>> Anyway, right now you won't be able to produce the corresponding
>> photoplotter files.
>>
>> While as far as I know Gerber only allows circular interpolation:
>>
>> http://www.artwork.com/gerber/274x/rs274xrevd_e.pdf
>>
>> it may be possible to produce elliptical arcs by using the SF
>> command (scaling factor). Neither the PCB nor the Gerber file
>> format allow to describe ellipses with arbitrary orientation.
> 
> IMO if PCB would fully support such complicated curves, it would
> better support something general like beziers; it would not be much
> harder, but more useful.

I agree -- Bezier splines are much more useful and flexible than ellipses,
and as an added bonus it's possible to use them to approximate an ellipse
closely.

Peter

-- 
Peter Brett <peter@xxxxxxxxxxxxx>
Remote Sensing Research Group
Surrey Space Centre


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