Re: Creating SVG: using MetaFun, exporting proper units, conversion to DXF

[William Adams <will.adams@frycomm.com>]

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Another option here would be to use a tool which directly accepts SVGs ---
one free/opensource tool for that is PartKAM/MakerCAM.

My apologies for the late response --- investigating this sort of thing
myself, though I'll likely be using a proprietary tool, Carbide Create to
drive either a Nomad or a Shapeoko.

William

On Thu, Jun 30, 2016 at 3:15 AM, Hans Hagen <pragma@wxs.nl> wrote:

> On 6/29/2016 10:49 PM, Mojca Miklavec wrote:
>
>> On 29 June 2016 at 14:12, Hans Hagen wrote:
>>
>>> On 6/29/2016 12:31 PM, Mojca Miklavec wrote:
>>>
>>>>
>>>> Hi,
>>>>
>>>> I want to play with CNC and don't yet have any experience with CAD
>>>> software (nor the licence for the expensive ones) other than perhaps
>>>> some Blender, so I decided to try to use the super ugly route with
>>>>     metapost -> svg -> dxf -> g-code
>>>> for the first time.
>>>>
>>>> I have a few questions.
>>>>
>>>> (1) I love Hans' shortcuts in metafun, but I seem to remember that
>>>> things
>>>> like
>>>>     input metafun;
>>>> or perhaps
>>>>     input mp-tool;
>>>> used to work, so that I don't have to remember to use
>>>>     mpost -mem=metafun my-drawings.mp
>>>> when compiling the graphics.
>>>>
>>>> Did the method with "input" ever work (or is it supposed to work)? Now
>>>> I'm getting a bunch of weird errors.
>>>> I would love to specify everything in the source file and then just
>>>> call mpost. If that doesn't work, that's fine, I can still add
>>>> "-mem=metafun", but ...
>>>>
>>>
>>>
>>> input metafun.mpiv ;
>>>
>>
>> How should one properly compile that file then to get the SVG?
>>
>
> some mp directive (but i never tried) as i always just use \startMPpage ..
> \stopMPpage so that fonts etc work ok too
>
> Using just "mpost something.mp" doesn't work that way.
>>
>> (2) I guess that using "raw metapost" is the only sane way to generate
>>>> SVG. If I use metapost inside ConTeXt that's probably not going to
>>>> work, right?
>>>>
>>>> (3) Is there any way to convince the SVG output mode to generate
>>>> something
>>>> like
>>>>     <svg ... width="100.0mm" height="100.0mm" ... >
>>>> rather than
>>>>     <svg ... width="283.46456692913387" height="283.46456692913387" ...
>>>> >
>>>> because the program I use to convert SVG to DXF has troubles
>>>> interpreting "points" properly. I read somewhere that they assume 90
>>>> points per inch because that's Inkskape's default.
>>>>
>>>
>>> why not just
>>>
>>> \startMPpage
>>>   whatever you want
>>> \stopMPpage
>>>
>>> and then use mudraw (mutools) to go from pdf to svg (that's what i do
>>> when i
>>> need svg)
>>>
>>
>> Given that metapost supports SVG natively I imagined that it would
>> produce a simpler/cleaner output. Thanks a lot for the suggestion,
>> I'll test it.
>>
>
> the svg from pdf is normally quite simple as it just output the same
> paths, colors etc + text as outline
>
> It turned out that the (opensource) tools I used for converting SVG
>> into DXF gives very weird result, so I have to change the other parts
>> of the "toolchain" as well.
>>
>> Nevertheless, the question about whether one could convince MP to
>> output true units in cm/mm/in.--
>>
>
> no, but you can of course scale the whole lot just before shipping so that
> units represent cm
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>       tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl
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