https://github.com/jywarren/logo-svg

A Logo (language) based SVG encoder.
https://github.com/jywarren/logo-svg

Last synced: about 2 months ago
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A Logo (language) based SVG encoder.

• Host: GitHub
• URL: https://github.com/jywarren/logo-svg
• Owner: jywarren
• License: gpl-3.0
• Created: 2015-06-18T17:56:42.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2015-08-27T15:27:22.000Z (over 9 years ago)
• Last Synced: 2024-10-14T08:15:46.217Z (3 months ago)
• Language: JavaScript
• Size: 1.07 MB
• Stars: 2
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
#Logo-SVG

**Note!** Abandoning in favor of https://github.com/jywarren/papert - an SVG-enabled fork of the Papert logo parser!

A minimal Logo command set for SVG.js:

* FORWARD/FW

* BACKWARD

* LEFT/LT

* RIGHT/RT

* SETX, SETY, SETXY

* REPEAT `n` [ ... ]

* TO FOO :ARG1 :ARG2 BODY END

Planned:

* RESET

* HOME

* CLEARSCREEN/CLEAR/CS

* COLOR [r g b]

* MAKE "X 1 (setting :X to 1)

* IF `COND` [ ... ]

Demo at https://jywarren.github.io/logo-svg

Inspired by the `canvas`-based version at https://github.com/rmmh/papert

But intended for lasercutting use, so SVG was needed!

Quite messy, not as generalizable as I'd like, so please chip in!

--Jeffrey Warren (unterbahn.com)

Addendum: As this progressed, it became more about me learning how to write a parser, by trial and error -- a thought experiment. 

****

##Developers

You'll need `npm` and bower, the latter with `npm install -g bower`.

I'm slowly cleaning this code up as an exercise for myself, but as of now you'll need to install the Grunt cli:

`npm install -g grunt-cli`

And run `grunt` from the root directory to watch for code changes and compile them into `dist/logosvg.js` on the fly.

****

Sketchpad for parsing math expressions:

This works now, but expressions with variables choke: ":N/360" remains one word, so variable recognition doesn't trigger.

  SO! um. We must glob our math expressions *after* variable substitution, OR we must be able to substitute variables buried within words

  AND we'd have to consider breaking out our variables into their own words, if they're not space-delimited from a math expression

AND what about parentheses?

AND what about conditionals? Would the above work for conditionals, if we add an IF blockCommand?