Re: [Pcb2gcode-devel] status update...

[Bernhard K. <ber...@gm...>]

Hi, i just updated my git, and some features i added is already in the git.
I will merge my stuff with the current git, and then try to upload it..
sorry...


On Mon, Nov 15, 2010 at 10:39 AM, Bernhard Kubicek <
ber...@gm...> wrote:

> Hi Crysn!
> Hi Patric, hi everybody else!
>
> a short status update after a couple of night working on PCB2Gcode:
>
> * there is now a switch -metric. A variable double unit=1 will be
> overwritten by 1/25.4 for that, and used for lenghts. dpi and output are
> unchanged
>
> * You can specify preamble und postamble files, with individual start
> up/end commands for your mill.
>
> * path-optimisation One routine calculates the distance betwwen a punkt and
> a linie. The rastered path is an array of x-y coordinaten. For each point of
> this array x_n is is evaluated if its already on the line between
> neighboring pixels: If the point  x_n' distance to the line  x_{n-1}x_{n+1}
> is smaller than a threshold,it is deleted.This is done until there no more
> change. The deletion is done using std::list...
> First, I wanted to delete longer tracks at once, however it was slow as
> hell:
> (int from=0;from<n-2;from++)
> (int to=from+2;to<n;to++)
> (int testpoint=from+1;testpoint<to;testpoint++)
> if all testpoints obsolet->delete
>
> Result: duplicated paths are not 100% equal. The simplification depends of
> the rotational direction. But the deviations are in the range of one pixel..
>
> * The floodfill needs  "components", groups of pixels with same colors,
> based on the black/white  rendered gerber. Outlines have 1 pixel width. If
> this line is not arranged vertical/horizontal, the floodfill needs to
> respect diagonal pixels. Otherwise one outline=multiple components.
>
> * -drilmilll mills holes by using the same tool as for the outline milling.
> E.g. the depth-steps and diameter. Larger holes are done by circle
> movements..
>
> * debug-images have useful names, partially
> "callingfunction_layername.png".
>
> * metaboard2.sh is a bash script that exports the layers from a eagle brd
> file  per command line option, and calls pcb2gcode with some settings.
>
> * output gcode now uses variables for z values, emc style #1, #2,...
>
> Open problems:
> * Outline does not work for me. My testing-pcb has a large interior hole  (
> eagle puts it both in outline and drill/wtf?). In this case, the outline
> calculation is faulty or creates an endless loop. One problem was the
> nondiagonal floodfill, sadly not the only one.
>
> * I would like that the  exporter-classes return a string to the  main,
> instead of writing files by them selfs. Thereby one can create combined
> files, for drilling+milling, and drilling+milling+outline, to check the
> output in e.g. EMC.
> This is not so easy, as ngc-exporter exists only once, and i need multiple
> layers individually.
>
> * offset und mill-diameter should be differentiated, otherwise the outline
> milling is corrupted while creating large offsets.
>
> * Style... I am used to tabs and other braket rules.
>
> * I need a way of making my changes available to you. Imho a patch is not
> the best solution, and I am not confident enough with git to just upload it.
> Maybe chrysn can help me there.
>
> If somebody could solve some of these problems, it would be awesome.
>
> I would propose that chrysn and me will combine our changes, and the bring
> them back to the community.
> Otherwise, if somebody wants my current code, i can send it by mail...
> I am a bit helpless with version-management...
>
> Bernhard Kubicek
> Metalab/Vienna/Austria
> 0664 620 7748
>
>