MrW's Computing Blog

Think of all the things you can draw in LOGO:

• Lines = fd 50 or bk 50
• Turns = rt 90 or lt 90 (or other angles)
• Circles = circle 50
• Squares = repeat 4 [fd 50 rt 90]
• Shapes =  repeat ? [fd 50 rt 360/?] (/ means divide; ? means number of sides)
• Stars = repeat ? [fd 50 rt 360 /? -180] same as shapes but change the angles; ? bigger than 8
• Spirals = see last post for Y5
• Colours = colour “blue
• Moving without drawing = pu setxy 100 100 pd
• Shading = fill (fills the area you are in with the current colour)
• Pen thickness = setpensize 5
• Procedures = to newthing …instructions… end
• Procedures with variables = to newthing :size :col …. end
• Call procedure with variables = newthing 50 “blue
• Make/change  variables = make  “length 50
• Use variables = fd :length
• Increase variables = make “length :length + 1

Your task

• Design and draw a picture with different elements (could doa uick sketch in j2e5).
• Use as many skills from the list above as you can
• You can copy and paste code from your previous projects
• Lavel your code with comment lines starting with semi colon ; ,eg
  • ;———-Wheel———–

Ideas

• A car or vehicle
• A robot
• A house or building

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]

Warm up

• Check work from last week – have I left you a learning conversation?  Can you fix/finish something?   Ask if not sure.
• Typing

Get started

1. Start a new LOGO page.  Type:

    reset
    setpensize 5

3. Draw a square:

    repeat 4 [fd 50 rt 90]

4. What do the numbers mean in this code?  4?  50?   90?

5. How could we change the numbers to get a different shape?  A triange?  A pentagon?  A hexagon?  Have a go and see what happens.

6. Type this code:

    make “sides 6
    repeat :sides [fd 50 rt 360/:sides]

7. sides is called a VARIABLE – we can change it to be any number.

8. Change the 6 to a 5 and play again.  Try some different numbers.

9.  Use this code to move to different places on the page:

    pu setxy 100 100 pd

Numbers can be from -250 to 250 (0 0 is in the middle)

10.  Can you make something like this picture – different shapes spread around the page?

11.  Think carefully: for each shape, you need lines of code for

– move to a different place
– change the variable
– draw the shape

(You can copy and paste lines of code to save time typing)