juicy-gcode

SVG to G-Code converter https://github.com/domoszlai/juicy-gcode

Latest on Hackage:0.1.0.3

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

BSD3 licensed by dlacko
Maintained by dlacko@gmail.com

Synopsis

Haskell SVG to G-code converter that aims to support most SVG features. The flavor of the generated G-Code can be influenced providing a configuration file.

Installation and usage

  • Install the latest Haskell Platform if you do not have it yet
  • $ git clone https://github.com/domoszlai/juicy-gcode.git
  • $ cabal install juicy-gcode/juicy-gcode.cabal
  • $ juicy-gcode --help
juicy-gcode - The SVG to G-Code converter

Usage: juicy-gcode.exe SVGFILE [-f|--flavor CONFIGFILE] [-o|--output OUTPUTFILE]
                       [-d|--dpi DPI]
  Convert SVGFILE to G-Code

Available options:
  -h,--help                Show this help text
  SVGFILE                  The SVG file to be converted
  -f,--flavor CONFIGFILE   Configuration of G-Code flavor
  -o,--output OUTPUTFILE   The output G-Code file (default is standard output)
  -d,--dpi DPI             Density of the SVG file (default is 72 DPI)

Configuration

The default G-Code flavor configuration file is the following:

gcode
{
   begin = "G17;G90;G0 Z10;G0 X0 Y0;M3;G4 P2000.000000"
   end = "G0 Z10;M5;M2" 
   toolon =  "G00 Z10"
   tooloff = "G01 Z0 F10.00"
}

A new configuration file can be set by the --flavor or -f command line option.

Another configurable property is the resolution of the SVG image in DPI (dot per inch). It can be given by the --dpi or -d command line option. Default value is 72 DPI.

Limitations

Missing features: text (easy with e.g. FontyFruity, maybe once, you can convert text to curves easily anyway) filling (moderately difficult) clipping (probably not easy, maybe once) images (not planned)

Testing and bugs

There is a JavaScript hanging plotter simulator mainly developed to test the generated gcode. Please file an issue if you run into a problem (or drop me an email to dlacko @ gmail.com).

Implementation

SVG images are built using the following shapes (all of these are subject of an arbitrary affine transformation):

  • lines
  • circles
  • ellipses
  • elliptic arcs with optional x axis rotation
  • quadratic and cubic bezier curves

In contrast G-Code implements only

  • lines
  • non-elliptical arcs

That means that only lines, circles and some arcs (non-elliptic ones without rotation) can be transleted to G-Code directly. If transformations are also counted, then only lines can be translated to G-Code directly as circles are not invariant under affine transformations. Because of this, the converter is implemented in two stages.

Stage 1

All the SVG drawing operations are translated to a list of MoveTo, LineTo and CubicBezierTo operations as these are invariant under affine transformations. Arcs, circles and ellipses can be easily approximated with bezier curves with a small error.

Stage 2

Cubic bezier curves are approximated with Biarcs using the algorithm described in [1] and explained here.

Changes

Revision history for juicy-gcode

0.1.0.3 -- 2017-03-19

  • Fix typo in cabal file

0.1.0.2 -- 2017-03-18

  • Fix generating arcs with negative I or J

0.1.0.1 -- 2016-10-31

  • Minor changes to the package description and README.

0.1.0.0 -- 2016-10-30

  • First version. Mostly feature complete, but not well tested.
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