MSWLogo

MSWLogo is a programming language which is interpreted, based on the language Logo, with a graphical user interface (GUI) front end. It was developed by George Mills at the Massachusetts Institute of Technology (MIT). Its core is the same as UCBLogo by Brian Harvey. It is free and open-source software, with source code available, in Borland C++.

MSWLogo supports multiple turtle graphics, 3D computer graphics, and allows input from ports COM and LPT. It also supports a windows interface, so input/output (I/O) is available through this GUI, and keyboard and mouse events can trigger interrupts. Simple GIF animations may also be produced on MSWLogo version 6.5 with the command gifsave. The program is also used as educational software. Jim Muller wrote The Great Logo Adventure, a complete Logo manual using MSWLogo as the demonstration language.

MSWLogo has evolved into FMSLogo: An Educational Programming Environment, a free, open source implementation of the language Logo for Microsoft Windows. It is released under the GNU General Public License (GPL) and is mainly developed and maintained by David Costanzo.

Features

MSWLogo, as of version 6.5b, supports many functions, including:

• TCP/IP Winsock networking
• Win16, Win32, Win32s
• Text in all available fonts and sizes.
• 1024 independent turtles.
• Bitmapped turtles
• Bitmap cut, paste, stretch
• Clipboard text and bitmaps
• MIDI devices
• Direct I/O to control external hardware
• Serial and parallel port communications
• Zooming
• Tail recursion: optimizes most recursive functions
• User error handli
• Standard Logo parsing
• Save and restore images in .BMP format files
• Color bits per pixel: 1, 4, 8, 16, 24
• Standard Windows hypertext help
• Standard Windows printing
• Separate library and work area
• Construction of Windows dialog boxes
• Event driven programming: mouse, keyboard, timer
• Multimedia devices: WAV sound files, CD-ROM control, etc.
• Event timers allowing multiprocessing
• 3D perspective drawing: wire-frame and solid
• Animated GIF generation

Command	Abbreviations	Syntax	Output	Example
FORWARD	fd	FORWARD(space)<number of steps to move forward>	Moves turtle forward for number of times specified	"forward 100" or "fd 100"
BACK	bk	BACK(space) <number of steps to move backward>	Moves turtle back for number of times specified	"back 100" or "bk 100"
RIGHT	rt	RIGHT(space) <degrees to rotate toward right	Turns turtle right for number of degrees specified	"right 228" or "rt 228"
LEFT	lt	LEFT(space) <degrees to rotate toward left >	Turns turtle left for number of degrees specified	"left 228" or "lt 228"
HOME	home	Home	Comes to screen center but does not clear the screen	"home"
CLEAN	ct cs	Clean	Clears the screen of trails but the turtle remains where it is without moving	"clean"
CLEARSCREEN	CS	Clearscreen	Clears the screen of trails and comes to screen center	"cs"
HIDETURTLE	HT	Hide turtle	Hides the turtle and aids viewing a clear drawing on the screen	"ht"
SHOWTURTLE	ST	Show turtle	Shows the turtle after it is hidden from the screen	"st"
PENUP	PU	(set) Pen up	Sets the turtle to move without drawing	"pu"
PENDOWN	PD	(resets) Pen	Resets to a drawing pen when ordered to move	"pd"
CLEARTEXT	CT	Clear text	Clears all text in the command screen	"ct"
CIRCLE	repeat 360 [FD (desired length in number of pixels divided by 360) RT or LT 1]	Circle	Makes a circle	"circle"
Pattern	pay	Pattern	Makes a pattern	"pattern"

External links

• Official website