This is a fork of jslogo that is modified for use in a Logo workshop where students wrote Logo programs and ran it on the Open Source Turtle Robot.
To achieve this, I built a Logo interpreter in CircuitPython and added it to my version of the OSTR firmware. This fork produces a CircuitPython program that contains a tokenized version of the Logo program which is then interpreted on the board.
To use this, write a Logo program as usual and use the Save to Turtle link to save turtlecode.py to the CIRCUITPYTHON drive. The
turtle should give two beeps and wait for a button press before
executing the Logo program.
Compared to the previous version, this version adds support for
REPEAT, FOREVER, and REPCOUNT. It also adds a BEEP command to
drive the Piezo speaker on the OSTR. The LEDs are available as two
boolean variables led1 and led2. Other features of the turtle
robot: the IR emitters, the button are not yet exposed to the Logo
interpreter.
The 2022 version of this fork captured a trace instead of saving the
tokenized program, and that code can be found in turtlerecord.js. It
is no longer used since the trace could not handle control flow
(e.g. forever) and will be removed in the future.
Like the original code, the modifications are licensed under the Apache License, version 2.0. The copyright is owned by the University of Rochester.
Original README contents below:
This is hosted at https://inexorabletash.github.io/jslogo/ for playing with live.
Language Reference - this attempts to implement a subset of UCBLogo defined in in Brian Harvey's Computer Science Logo Style
to star repeat 5 [ fd 100 rt 144 ] end
star
to square :length repeat 4 [ fd :length rt 90 ] end
repeat 36 [ square 50 rt 10 ]
to randomcolor setcolor pick [ red orange yellow green blue violet ] end
repeat 36 [ randomcolor square random 200 rt 10 ]
window pu repeat 72 [ setlabelheight repcount fd repcount * 2.5 label "Logo bk repcount * 2.5 rt 10 ]
- Logo on Wikipedia
- Other Logo implementations that run in a Web browser:
- The Logo Foundation
- Berkeley Logo (UCBLogo)
- The Logo Tree Project
- Ian Bicking on Logo
- PyLogo
- Introduction to Computer Programming
- Document deviations from UCB Logo standard
- Make these examples all work: Logo 15-word challenge
- Tail-call optimization
- Make execution async so you can watch the turtle move