LOGO - PowerPoint PPT Presentation

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LOGO

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LOGO – PowerPoint PPT presentation

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Title: LOGO


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
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 gt 30 stop a condition stop
    fd size rt 15 many lines of
    action spiral 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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