https://github.com/epost/purescript-free-turtle

A toy turtle graphics interpreter based on the Free monad, in PureScript, with HTML Canvas graphics support.
https://github.com/epost/purescript-free-turtle

free-monad purescript turtle-graphics tutorial-code

Last synced: 12 days ago
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A toy turtle graphics interpreter based on the Free monad, in PureScript, with HTML Canvas graphics support.

• Host: GitHub
• URL: https://github.com/epost/purescript-free-turtle
• Owner: epost
• License: mit
• Created: 2014-10-27T00:52:37.000Z (about 10 years ago)
• Default Branch: master
• Last Pushed: 2020-10-01T21:41:57.000Z (about 4 years ago)
• Last Synced: 2024-10-30T06:29:00.489Z (about 2 months ago)
• Topics: free-monad, purescript, turtle-graphics, tutorial-code
• Language: PureScript
• Homepage:
• Size: 35.2 KB
• Stars: 16
• Watchers: 3
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.org
  • License: LICENSE

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README

        
#+title: PureScript Free Turtle interpreter

A simple Turtle graphics system implemented using a ~Free~ monad, intended for educational purposes. It comes with an interpreter that translates programs in the Turtle language to HTML canvas graphics.

[[file:img/two-stars.png]]

#+BEGIN_SRC purescript

main :: Effect Context2D

main = CanvasInterpreter.render "turtleCanvas" do

  color Purple

  star

  forward 40.0

  left 100.0

  color Red

  star

star = do

  penDown

  right 144.0

  forward 100.0

  right 144.0

  forward 100.0

  right 144.0

  forward 100.0

  right 144.0

  forward 100.0

  right 144.0

  forward 100.0

  penUp

#+END_SRC

*  Usage

In your shell, type:

: npm install

: npm run build

: npm run bundle

Then point your browser to [[./html/index.html]].