Scratch

Scratch

Responding toInput

Lesson Objectives

● Look at what the term input means● See how to control a sprite using keys● See how to move a sprite in small steps● Change sprites (or costumes)

Movement costumes

● Before we start coding we need our costumes!

● We need to create a sprite for each direction they will be facing.

● This can be done by rotating the sprite and tweaking.

Importing costumes

● This can be done on the costumes tab.

● Simply click import and load up the 4 images

Responding to key press

● Under control is the “when x key pressed”

● Anything connected to this will run when that key is pressed.

● You can choose the key by selecting from the drop down

Sequence of events

● What are the sequence of events for going left?

● And no it is not just “go left”!

Sequence of events

● Change costume to “left”● Move 4 spaces.

● This will be the same for each key press● You will also need to choose the right axis (x

or y)

Solution

● Notice that it is repeated for each key press

● Left and right use x● Up and down use y

Activity

● Create a new scratch file● Create a sprite with 4 costumes (up, down,

left and right)● Import your spite and costumes● Get your sprite to move!

Finding a sound loop

● Do a search for “sound loops” to find a short bit of music to play.

● Flash kit is a great place to start

Import sound

● You can import a WAV or MP3 file

● This is imported into a sprite the same way a costume is

On click play some music!

● To play the sound we need the code on the right.

● Note that the colours represent the section each command came from.

● You could loop the sound if you wanted to!

Activity 2

● Add music when you click on your sprite