Copyright © University of Cambridge. All rights reserved.
'Logo' printed from http://nrich.maths.org/
Commands roughly follow MSWLogo syntax, so until we have a complete
help system, please use the MSWLogo help for deeper explanations.
Command names are case insensitive.
e.g. 'print', 'PRINT, and 'Print' are all equivalent.
Here is the list of Logo commands that are currently supported in
some shape or form.
+ - * / = < > abs arccos arcsin arctan back bk butfirst
butlast clearscreen cos cs difference empty equalp exp first
forward fd fput greaterp halt heading hideturtle ht if ifelse int
item last left lessp list ln log10 lput make member minus pd
pendown penup pi power print product pu quotient radarccos
radarcsin radarctan radcos radsin radtan repeat right run sentence
setpc setpencolor setpencolour setpensize setspeed setx setxy sety
show showturtle sin speed sqrt st sum tan trace untrace wait word
The demonstrator starts with the editor already containing a
working program. Press Run to test this. You should see it output
to both the turtle graphics window and the output window.
To enter your own program, clear the editor panel and type it in.
Use 'Revert' to restore the demonstration program.
In this version you may save a copy of one program using the Save
button. This will be restored to the editor panel when you press
Load. The code is stored on your computer so Load will only restore
a program you saved earlier using the same machine.
If you want to save a program into a file, you can do so by
selecting the text, then Right-Click > Copy. Paste the result
into any text editor and save. You can use something like Notepad,
Word, TextEdit for this last step.
To reload a program saved in this manner, simply paste the text
back into the editor box with Right-Click > Paste.
Window panels can be moved, minimised, and resized. To illustrate
different problems we can configure these panels appropriately and
seed the editor with some initial logo code.
Differences from MSWLogo
- SETSPEED sets the turtle animation speed. It needs a number
between 1 and 10. SPEED returns the current turtle speed.
- Just one turtle is allowed
- The turtle can only move in 2D space.
- We don't plan to support BURY and related commands, functional
programming constructs (APPLY, YIELD, MAP,...), exception handling
with THROW and CATCH, legacy Windows colour palettes and patterns,
Logo generated user controls (RADIOBUTTONCREATE,...)
- The following will be supported only if needed: the ARRAY data
- These can never be supported due to the limitations of Flash
and/or online delivery: File I/O, 3D, POLY commands
(POLYSTART,...), access to MIDI devices, Mouse I/O.