LOGO Turtle Graphics for kids History Logo from

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LOGO "Turtle Graphics“ for kids.

LOGO "Turtle Graphics“ for kids.

History § § § Logo: from Greek logos for “word” Developed by a team

History § § § Logo: from Greek logos for “word” Developed by a team at MIT in 1960 s Notable: Seymour Papert § Mathematician from Geneva § Worked with Piaget who influenced him § Designed as a dialect of LISP

Why the Turtle? § Originally a robotic creature sat on floor § Domed shape

Why the Turtle? § Originally a robotic creature sat on floor § Domed shape with shell-like electronics casing § Slow movement of device § Directed to move around and draw by typing commands at computer § Designed to be programmed by children § Less expensive version created on computer

Evolution § 130 existing implementations 1977 1985 1993 1967 2003 TILOGO Apple LOGO Atari

Evolution § 130 existing implementations 1977 1985 1993 1967 2003 TILOGO Apple LOGO Atari Logo IBM Logo Learner Mac. Logo Object Logo LOGO Writer PC LOGO LEGO LOGO WIN Comenius LOGO Logo Grafico Micro. Worlds LOGO § Driven by commercial and regional factors Mach Turtles Logo UCB Logo MSWLogo

Language Concepts § Basic commands § Control Structures § § § while condition [instruction

Language Concepts § Basic commands § Control Structures § § § while condition [instruction list] until condition [instruction list ] repeat number [instruction list] § Recursion (preferred paradigm) § Scoping § Global variables: if not declared before use § Local variables: § may be declared § Input variables for functions are local

Basic commands § Forward 100 (FD 100) - moves the turtle forward 100 units

Basic commands § Forward 100 (FD 100) - moves the turtle forward 100 units § Back 50 (BK 50) - moves the turtle back 50 units § Right 45 (RT 45) - turns the turtle 45 degrees to the right § Left 90 (LT 90) - turns the turtle 90 degrees to the left § Home - Returns the turtle to its origin § Clear. Sceen (CS) - Erases the screen

Features § § § Graphics / Music Extensibles: basic operations “primitives. ” Working Definitions:

Features § § § Graphics / Music Extensibles: basic operations “primitives. ” Working Definitions: allows for userdefined new definitions Modularity Interactivity Flexibility

Recursion § to spiral : size § if : size > 30 [stop] ;

Recursion § to spiral : size § if : size > 30 [stop] ; a condition stop fd : size rt 15 ; many lines of action spiral : size *1. 02 ; the tailend recursive call § end

MSW LOGO Implemenation Source: http: //www. softronix. com

MSW LOGO Implemenation Source: http: //www. softronix. com

Example: Square § Turtle Moves forward and turns 90º 4 times § REPEAT 4

Example: Square § Turtle Moves forward and turns 90º 4 times § REPEAT 4 [FD 100 RT 90] Source: http: //mckoss. com/logo/

Examples Source: http: //www. yukoncollege. yk. ca/

Examples Source: http: //www. yukoncollege. yk. ca/

Future of Logo § New Releases of LOGO: § Net. Logo § Parallel modeling

Future of Logo § New Releases of LOGO: § Net. Logo § Parallel modeling and simulation § Northwestern University § Star. Logo § MIT

LOGO Turtle Graphics for kids History Logo fromLOGO Turtle Graphics for kids History Logo from
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