Scratch creating movement elementary

What you will learn• In this exercise we will learn: – How to create a simple movement programme called a script in programming language – How to make the sprite reverse in direction –

Using MIT Scratch for Programming and Control

Exercise 1 Creating movement

Year 11 DTG

2012

What you will learn

• In this exercise we will learn:

– How to create a simple movement programme

(called a script in programming language)

– How to make the sprite reverse in direction

– How to make the movement go forever (until

we stop the programme)

– How to make the sprite “walk” on the screen

using costumes

Simple movement

• One of the easiest programs to make is one that moves

a figure on the screen

• In Scratch the figure is called a Sprite.

• By default the sprite is a cat but there are many other

sprites that we can use and that we will see later………

Simple movement

• Click on the Control

button shown on the left

• A series of commands will

appear below the topics

box

• Select the first one (when

flag is clicked), and drag

it to the Scripts area of

the screen

Simple movement

• Next click the Motion

button (to the left of the

Control button)

• Drag the move 10 steps

button across and lock

it underneath the earlier

command Your

program should look

like the one on the

right

• Click the green flag

near the top right of the

Scratch screen to run

your program

Amending the program

• Now every time you click the green flag the sprite will

move by 10 steps

• You can change the amount of movement by altering the figure in the movement command

• Double click on the value in the movement control and type in a new value

Changing Direction

• In this program we will make

the sprite change direction We

will build on the program that

we have created already.

• Change the movement value

in your previous program from

10 to 40

• Click the control option again

and select the wait 1 secs

command

• Click the motion button and

add the point in direction 90

command below it

Changing Direction

• Click the motion button

and add the point in

direction 90 command

below it

• Click on the arrow beside

the 90 and select -90

from the list

• Add another movement

command and change

the value to match the

first

• Add another wait

command, and then

another 'point' command

Changing Direction

• Finally, at the top of the screen where there is a small image of the sprite, click the middle button next to the image of the sprite This makes the sprite change direction to match his movement

Repeated movement

• Repeated movement

(using forever)

• Often we want the

sprite to be animated

continuously until we

tell it to stop

• In order to get the

script that we have

written to loop use the

Forever instruction.

Walking sprite

• Click on the

costumes tab –

note that the cat

sprite comes with

two costume

• Rename the sprite

as cat

• Rename the

costumes as

Catwalk1 and

catwalk2

Walking sprite

• If you have followed all of the instructions correctly your sprite should walk backwards and forwards across the screen

• Save this project is your user area with the file name

catwalk1