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LOGO

LOGO. "Turtle Graphics“ for kids. . History. Logo: from Greek logos for “word” Developed by a team at MIT in 1960s Notable: Seymour Papert Mathematician from Geneva Worked with Piaget who influenced him Designed as a dialect of LISP. Why the Turtle?.

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LOGO

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  1. LOGO "Turtle Graphics“ for kids.

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

  3. 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

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

  5. 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

  6. 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 • ClearSceen (CS) - Erases the screen

  7. Features • Graphics / Music • Extensibles: basic operations “primitives.” • Working Definitions: allows for user-defined new definitions • Modularity • Interactivity • Flexibility

  8. Recursion to spiral :size if :size > 30 [stop] ; a condition stop fd :size rt 15 ; many lines of actionspiral :size *1.02 ; the tailend recursive call end

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

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

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

  12. Future of Logo • New Releases of LOGO: • NetLogo • Parallel modeling and simulation • Northwestern University • StarLogo • MIT

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