Y5 LF: Use variables to draw spirals

Warm up

• Read learning conversations, correct code
• Typing

Recap

• Following instructions….
• Variables
• 360/:sides
• setxy
• Efficient code

Success steps

• Follow instructions
• Try to understand why it works
• Debug by yourself
• Tinker with your code
• Copy and paste images to a j2e5 page

Let’s go: What is a spiral?

1. Start a new LOGO file
2. Type: reset setpensize 5
3. Save it as spiral
4. Lets set up two variables:
   1. make “sides 4
   2. make “length 30
5. Copy this code:
   1. repeat 10
   2. [
   3. fd :length rt 360/:sides
   4. ]
   5. Play – it should just draw a square over itself a few times
      1. To make it a spiral, we need to make the length longer each time.
   6. Put the following code at the end but before the ] bracket:
      1. make “length :length + 10
   7. This should draw a spiral…if not, debug
6. Tinker:  Try:
   1. different values of “sides at the start
   2. increase the repeat number
   3. changing how much you add to  “length in step 5.3
   4. adding a new variable called “pen (make “pen 3) then add these lines in the repeat brackets:
      1. setpensize :pen
      2. make “pen :pen + 1
   5. Right hand click each spiral and copy and paste it into a j2e5 page to show what spirals you have made.
   6. Create a page with at least 6 spirals on

Finished?

In a new LOGO file, type this simple code, play it then tinker with it…

reset
repeat 250 [forward repcount rt 89]