Intro Adult Hour Scratch

8/11/2019 Intro Adult Hour Scratch

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ITEC Winter 2010 1

An intro to programmingconcepts with Scratch

Quick intro for college citizens.

George StockmanMSU CSE


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ITEC Winter 2010 2

A 10-minute PR clip

sallyAndHorse.sb


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ITEC Winter 2010 3

What can we do with Scratch? Learn some computing concepts.

Learn some practical algorithms. Have fun with Scratch creating stories,

games, art.

We are teaching Scratch after school tomiddle school kids with the goal ofincreasing interest in STEM.


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ITEC Winter 2010 4

Start scratch and lets go!

Click on the cat icon

If not on desktop, downloadfrom www.scratch.mit.edu

Scratch programming

environment comes up quickly We will first do simple ops
http://www.scratch.mit.edu/http://www.scratch.mit.edu/


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ITEC Winter 2010 5

Scratch environment Stageis at upper right (where actors act and

information is displayed) Spriteis another name for actor (object).

Instruction menus/panel at left (instructionsfor the actors)

A scriptis another name for program ormethod; a script tells the actor what to do.

Programming panel in center; here is wherewe construct scripts for the sprites (Sprites are objects; their scripts are methods

or behaviors.)


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ITEC Winter 2010 6

We start with the cat sprite

We will learn to use other sprites

and many sprites LATER. Now weuse the cat as our only actor.


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ITEC Winter 2010 7

The LOOKS menu

Has operations for setting the color,size, and visibility of a sprite.

Constumes will be used LATER


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ITEC Winter 2010 8

The hello script (program)

Double click on the say hello lego block

Check your sprite behavior at the right

Then double click say hello for 2 secs

Your very first Scratch program!


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ITEC Winter 2010 9

Try some other looks

operations (double click items) Change color effect by 25

Change color effect by 25 again

Hide

Show

Change size by 10 Change size by 10 again

Set size to 100%


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ITEC Winter 2010 10

Lets write a script to Say hello for 2 seconds

Then change color by 25

Then think Hmm.. for 4 seconds

Then change color by 75

Then change size by 200

Drag the instructions from the menu to the center panel.Connect them into a single block. Edit the parameters toget the numbers we want.


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ITEC Winter 2010 11

Our script (program)


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ITEC Winter 2010 12

The WAIT instruction is needed to slow down the acting so

we can see or hear it properly(computers are too fast sometimes)

Get the wait instruction from theCONTROL menu. Please ignore theother menu options at this time.

Insert a wait in our looks script


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ITEC Winter 2010 13

3 second pause between

changing color and size


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ITEC Winter 2010 14

The MOTION menu

How to locate and orient a sprite;

position and angle; moving asprite


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ITEC Winter 2010 15

Position on the stage Using the Looks

menu, shrink

our cat to 25%. Click on the

Motion menu.

Click to check

the box for x-position and y-position

Drag your cataround and note itsx-y position.


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ITEC Winter 2010 16

Other instructions

goto x,y

glide to x,y

Move N steps

Set direction


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ITEC Winter 2010 17

The glide-to instruction

Drag the glide-to instruction into yourscript panel.

Edit in some coordinate values anddouble click to see where your spritesgoes.


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ITEC Winter 2010 18

The SENSING menu

Getting information from the user

or some other machine


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ITEC Winter 2010 19

Use the SENSING menu

1) Ask the user for age; 2) user types in age;

3) result stored in answer


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ITEC Winter 2010 20

User types 13 and the scriptstores the answer

answeris aSpecialScratch

variable


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ITEC Winter 2010 21

OUTPUT: Giving the user

information with say answer

Sayis in Looks menu;drag answer from

Sensing menu; click


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ITEC Winter 2010 22

Making an age variable

1) Click Variables menu; 2) click Make a variable

3) Type in age and click OK

Do you want todisplay for allsprites or just one?


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ITEC Winter 2010 23

We have an age variableDisplaying variable ageOperations for age


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ITEC Winter 2010 24

We canjointext and anumber to say things

Build this instruction fromthe parts above it.

From Looks

From Operators

From Sensing

Make the join


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ITEC Winter 2010 25

Storing a value in a variable;then saying it to the user

1) Setfrom Variables menu; 2) Sayfrom Looks menu; 3) Joinfrom theOperators menu joins your text with the answer


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ITEC Winter 2010 26

A first program for 6thgrade

The variable V now stores the computed average of A and B


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ITEC Winter 2010 27

Changing costumes

Another way to change the

appearance

of a sprite.


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ITEC Winter 2010 28

Making a new costume

1) Get bat2-a sprite fromthe sprite box.

2) Click on sprite

3) Click on Costumes

4) Click on Import

5) Now get bat-2b spritefrom the sprite box


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ITEC Winter 2010 29

Use a loop to make the bat fly!

1) Whenand repeatfrom Control menu and 2) next costume fromLooks menu.


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ITEC Winter 2010 30

Changing coordinates

We can randomly set the location of the

bat so it will flutter. Set X to a random number

Set Y to a random number

Move the bat to location (X,Y) Of course, the bat should remain on

stage!


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ITEC Winter 2010 31

Usingpick random

Click the stop sign at the stage upper right to stop the forever loop.

Do we need a wait in the loop? Try it to see the change in flying.


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ITEC Winter 2010 32

Multiple interactive bat flight


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ITEC Winter 2010 33

Adding a background

Click on theStageicon atlower right

Click onBackgrounds

Click on baticon (Sprite1)

Click onScripts

FLY AGAIN!


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ITEC Winter 2010 34

Controlling the bats direction

Lets create multiple scripts.

Click space bar for random moves

Click right arrow to move right Click left arrow to move left

The bat will behave differently

depending upon which key is typed! (So, could a gamer catch the bat?)


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ITEC Winter 2010 35

On to multimedia, games,stories

Detecting events;

sending messages;using music and audio;


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ITEC Winter 2010 36

See stock example: Mad Lib

Explore the available examples;

Mad Lib under stories;Study message sending;


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Study Break Dance

Music and dance example;

Messaging;Use of stock music and costumes


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ITEC Winter 2010 38

Digitizing your own audio

Use din example


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Composing with drum beats


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ITEC Winter 2010 40


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ITEC Winter 2010 41

Jodi jumps on the drum

Story teller script Jodis script


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ITEC Winter 2010 42

Recording from a mike (or aniPod or other music player)

1. Plug in microphone

2. Pick the speaker sprite

3. Click Sounds4. Click Record

5. Click red button and speak

6. Click square button to stop

7. Click triangle to hear it

8. Click OK if its OK

9. Use name of sound in a play-soundinstruction


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Where does all this lead?

Definitely engaging for grades 6,7,8.

Does it increase STEM interest of our kids?

Does it motivate college computing classes?Does Scratch make a smarter Lego bot?

Date post:	03-Jun-2018
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Intro Adult Hour Scratch

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