Logo Introduction

1
Logo Introduction
turtle
Command bar
2
Logo basic commands

• Forward fd
• Right turn rt
• Left Turn lt

We need a space then a value to tell the turtle
how far to move or turn
For example, the commands fd 100 rt 90 fd
100 Would give us
3
Logo higher commands

• Clear screen cs
• Hide turtle ht
• Show turtle st
• Pen up pu
• Pen down pd
• Pen erase pe
• Pen normal ppt

Means we can move and start a new drawing.
4
Repeat commands

• These make life easier.
• A square could now be written using a single line
  of text.
• repeat 4fd 100 rt 90

5
Polygons

• The external angles of any polygon add up to
  360.
• For a regular polygon we can write
• Where sides is the number of sides required.

Repeat sidesfd 100 rt 360/sides
6
Polgons

• For example
• repeat 10fd 50 rt 360/10
• I made the lengths shorter so it fit on the page!

Gives us a decagon.
7
Define shapes

• Another short cut lets us define shapes to re-use
  them quickly.
• We type to square in the command bar
• A pop up then allows us to write the rule to draw
  a square.

From now on I can draw a square just by writing
square
8
Patterns

• Patterns can quickly be made using defined
  polygons and repeat functions.

• We can also change the pen size and colour!