1. 2
Making Blocks

2. 1 2 3 Today’s Objectives Know how to break problems down into chunks
Know how to define blocks without or with inputs 3
Know how to call the blocks in a program
Create programs where you create your own blocks

3. Draw a square
Leave CAT sprite & leave stage WHITE

4. How to draw a Square
100
Pen down
Forward 100
Turn 90
Pen up
90°

5. Blocks needed to draw a square
Motion
Pen
Pen
Add Extensions

6. How to draw a Square

7. ‘Smarter’ programming
Smart programmers break problems down into smaller parts so they can write code in chunks or modules.
In Scratch, you create modules by making your own blocks.
Scratch Blocks
Own Blocks

8. 3 Stages of creating blocks
DEFINE
You define a block with a meaningful name
You add any inputs like special variables to use in the block
You call the new block from your program
CALL

9. Define you block
Click Make a Block
Give it a name
Click OK

10. Defining and Calling Blocks
CALL in MAIN program
DEFINE
call
execute
return

11. Defining block - initialise
Initialise is coding what you want to happen at the START of your program.
call
execute
return

12. Challenges 5 6 3 Make a draw triangle block Make a draw pentagon block\
Make a draw triangle block
Make a draw pentagon block
Make a draw hexagon block
Make one up…
120°
360/3=120
72°
360/5=72 5 6 3

13. Shapes program

14. [1] Squares Using your draw square block, draw this pattern.
Using your draw triangle block, draw this pattern.

15. 1 2 3 Today’s Objectives Know how to break problems down into chunks
Know how to define blocks 3
Know how to call the blocks in a program
Create programs where you create your own blocks