Re: [MACTCL] TkCAD

[Revar D. <rev...@gm...>]

The mlcnc_critcl extension derives from the TCL code in the tksrc/lib/mlcnc/ directory.  There's more geometry code in tksrc/lib/geometry.tcl and tksrc/lib/matrixmath.tcl .

I profiled what the mlcnc TCL code was being slow at (using tksrc/lib/profile.tcl) and wrote C-based replacements for those routines.  This vastly sped up the inset and boolean geometry operations.

My original work on mlcnc predated the inclusion of the math::geometry library, as I recall, but I changed some code to take advantage of it, since.  The mlcnc library -- Mid-Level CNC -- was originally created to make Tcl scripts that described complex tool paths, and includes operations like inset/outset that are much higher level than math::geometry supports.  I later grafted the library into TkCAD, so I could lay out things visually.

I made enhimgcopy by taking the code at http://wiki.tcl.tk/11924 and making it compilable using critcl, more or less.  To be honest, when I can use tkpath, it makes enhimgcopy more or less irrelevant for the CAD's purposes.

I am the complete and total fail at getting TCL/Tk 8.6 to compile embedded under OS X, recently, and haven't been able to compile extensions for about a year now.  I suspect I've been Doing It Wrong in how I have my build environment set up.  Kind of frustrating.  This is part of why I use critcl in my extensions... Because TEA, ironically enough, intimidates me.

	- Revar



On Nov 22, 2010, at 10:35 AM, Andreas Kupries wrote:

> Having looked at your README.txt I am also interested in getting links for the 
> C extensions you mention, especially
> 
>   fontdata        Gets font glyph curves. (Critcl, Carbon only, simple)
>   mlcnc_critcl    Speeds up geometry calculations. (Critcl, portable)
>   enhimgcopy      Allows scaling and rotation of images.  (Critcl, portable)
> 
> The mlcnc I would like to compare against math::geometry in tcllib (1) and the 
> enhimgcopy against the CRIMP (2).
> 
> 
> Aaah, never mind ... Looking deeper into the directory structure I see that 
> these are all part of the TkCAD sources, not separate.
> 
> Time to clown^Wclone around...
> 
> 
> (1) http://sourceforge.net/projects/tcllib/
>     http://docs.activestate.com/activetcl/8.5/tcllib/math/geometry.html
> 
> (2) http://chiselapp.com/user/andreas_kupries/repository/crimp/home
> 
> 
> 
>> Basically I'm not too worried what folks want to do with the code, as long 
> as it's useful to them and they can modify it as needed.
> 
> 
> -- 
> Andreas Kupries
> Senior Tcl Developer
> ActiveState, The Dynamic Language Experts
> 
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