This explains about the Scratch software. Its utility and scope. It well defines the how sprites or characters interacts or operate in Scratch using different command. Scratch is a very good platform to develop games and to make learn to kids about coding and game developments. However they can also creates stories, animated videos with the help of Scratch

1. HOW SPRITES INTERACT
By:
Dr. Md. Shahnawaz Shaikh

2. Introduction to Scratch
Scratch is a programming website created by M.I.T. It
shows a bunch of sprites (the characters/actors of the
program) on a background (the setting of the program). The
characters can be moved using the programming blocks.
There are plenty of blocks including motion, sound and
control blocks. These blocks help the sprites come to life on
the background and help create the program/code.
https://scratch.mit.edu/
SCRATCH is a programming language that lets
you create your own interactive stories,
animations, games, music, and art.

4. LET’S DO

5. 1. Start Moving To Cat
Drag a MOVE block into the Scripts area.

6. 2. Add a Sound
Drag out a PLAY DRUM and snap it onto the MOVE block.

7. 3. Start a Dance
Add another MOVE block. Click inside the
block and type in a minus sign.
Click on any of the blocks to run the stack.
Add another PLAY DRUM block, then choose a
drum from the menu. Click to run.

8. 4. Again and Again
Drag out a REPEAT block and drop it on top of the stack. You want the mouth of the REPEAT to
wrap around the other blocks.
To drag a stack, pick it up from the top block.

9. 5. Say Something
Click the LOOKS category and drag out a SAY block

10. 5. Say Something
Click inside the SAY block and type to change the words. Click to try it.

11. 6. Green Flag
Drag out a Green Flag block and snap it on top

12. 7. Change Color
Now try something different...... Drag out a CHANGE EFFECT block.

13. 8. Key Press

14. 9. Add a Backdrop
We can add a backdrop/ Background to the Stage.

15. 9. Add a Backdrop
The new backdrop now appears on the Stage.

16. 10. Add a Sprite

17. 11. Explore!

18. 11. Explore!

19. Sprites (Characters)
Sprites are the main part of the program. They are the
characters or actors on the screen. The most basic sprite is
an orange and white cat. But there are plenty of others, too.
There are the animal, people and cartoon sprites that do all
the moving. There are also musical instruments, balls, food,
clothes and letter sprites that shouldn’t move. Sprites can be
anywhere on the screen and the moving sprites can move to
wherever they have to be using motion blocks. If you don’t
find the sprite you want, you can draw it on the bottom
right corner. There can be multiple sprites on the screen at
one time.
https://scratch.mit.edu/

20. Backgrounds (Settings)
Backgrounds are in the background of the screen. They are
the setting of the scene. Backgrounds can be colorful, dull,
spooky, fun etc. The sprites are on the background. Unlike
sprites, there can only be one background on the screen at
one time. There are plenty of backgrounds from beaches to
witch houses. When choosing a sprite to go with the
background, the sprite should fit in with the background.
For example, a butterfly would look better on a background
with flowers rather than a background of a baseball
stadium. If you don’t find the background you want, you
can also draw it on the bottom right corner. Backgrounds
help the viewer understand where the scene is taking place.

21. Motion Blocks!
These blocks move your sprite! Every motion you’ll need you will find
here. (unless it doesn’t exist)
https://scratch.mit.edu/

22. Look Blocks!
These blocks are where you can make your sprite talk! You can also change
their appearance.
https://scratch.mit.edu/

23. Sound Blocks!
As redundant as this is, these blocks make sound! Like instruments for
example.
These are
already filled
in, but you can
do that on your
own later!
https://scratch.mit.edu/

24. Event Blocks!
Event blocks can only work at the start of your code, they are the reason the code
will go. They indicate the start and when your sprite should listen to your code.
https://scratch.mit.edu/

25. Control Blocks!
These blocks are where you can find your if then statements and your loops. These may
not be the only reason your sprite does things but they are still a large part of the reason.
https://scratch.mit.edu/

26. Sensing blocks!
● Senses colors or if its touching
an edge or mouse pointer
● Ask and wait for an answer
● Set date, answer, timer and
username https://scratch.mit.edu/

27. Operating blocks!
● Blocks that include computing
of integers or other variables,
absolute value and modules.
● Random number
● Booleans
● Find a value of a list
https://scratch.mit.edu/

28. Variable blocks!
● Make, set, change, show and
hide a variable.
● Make a list https://scratch.mit.edu/

29. Variable blocks!