kicad-developers team mailing list archive

[jp charras <jp.charras@xxxxxxxxxx>]

Le 16/02/2016 13:33, Clemens Koller a écrit :
> Hi, Jean-Pierre
> 
> On 2016-02-16 13:04, jp charras wrote:
>> Le 16/02/2016 11:59, Clemens Koller a écrit :
>>> On 2016-02-16 09:30, Mikael Arguedas wrote:
>>>>     If you are implementing the ceiling function in a parent class, use 0.05
>>>>     mm, because it will be not necessary used for sizes, but also for
>>>>     distances, and round the half size if needed.
>>>
>>> Ok, I might be nitpicking again:
>>> Can we make that rounding value configurable?
>>> I would call this minimum drafting design width/gap.
>>>
>>> With smaller and smaller SMD sizes, even 0.025mm is a quite
>>> coarse grid/minimum width size. I ended up with 0.01mm.
>>> I have already 0603M (0201) 0402M (01005) 03015M (008004) (M=metric)
>>> sizes arriving in my calculations... @:-|
>>>
>>> Regards,
>>>
>>> Clemens
>>
>> We are not talking about rounding width values, but the position of the
>> courtyard corners definition in SMD ICs footprint generators.
>> This is not exactly the same thing, and 0.05 rounding could be enough.
> 
> Sorry, I wasn't clear enough: I also mean the position of
> corners/frames/drafting items.
> Width and/or gap both together translate to position or
> "design resolution". I don't know how you want to call that.

Just the working grid resolution.

the ceiling function could be just a "put on grid" function, because we
don't aways if the value to "round on grid" must be rounded to near, or
ceil or floor.

> 
> But the important part to me is: Please don't hard-code it.
> Make it adjustable (i.e. 0.05mm, 0.025, 0.01mm, ...) as
> it might vary how small the stuff gets.
> (Others might do Chip-on-Board stuff or Die-Bonding.)
> 
> Regards,
> 
> Clemens
> 
 0.05 mm could be the default value, with something like a
SetRoundingGridSize( aGridSize ) or SetRoundingThreshold to change the
actual value, for instance.

Not also the rounding is only made on request in python scripts, not for
all values, therefore only for a few parameters.

So setting the rounding threshold is not so important.

-- 
Jean-Pierre CHARRAS