Scratch Programming

Session 9 of 10Review elements

to use in stories, games, etc.

Objectives

• REVIEW, ANSWER QUESTIONS, GET FEEDBACK• We will be going around again today to check

if you are having any problems with your project.

Important Concepts for Project

• Variables – When/Where/How?• Time• Loops – When/Where/Why?• Transitions

Variables

• How to make a variable– Go to variables tab– Click create variable– Give Variable a name

• What could variables be used for?

Loops

• How to Loop:– Insert a Forever or a Repeat [ ] times loop– Insert what you want inside it

• When to use a loop– If you repeat the same action several times– To count time

Time

• Count-Down Timer:– Forever– Wait 1 second– Timer=Timer-1

• Time Elapsed:– Forever– Wait 1 Second– Timer=Timer+1

• How to include an Element of time in the game:

Transitions

• Changing from one “level” or “scene” or part to another– Broadcast/Receive– Time

Changing Parts with Broadcast and Receive

• Place a [broadcast Scene2] at the end of an event

• Add a [when I receive Scene2] to begin the next level/scene.

Changing Parts with Time• Start with a Forever if Time=20

– Say “I’m going to do something here”

This is the Timer, it controls the clock that everything else will be run on.

This is an event that is triggered when the Time = 9, or when 9 seconds have passed.

This tells the script that the event is finished, and the loop can stop looking for Time=20

Reset

• Add a button (could be when Green Flag is clicked) to reset your game or story.– Show or hide all of the sprites– Reset all of the Variables to their starting value

(usually 0)– Anything else your specific program needs (change

the background, move sprites to a starting position, anything)

QUESTIONS??

• What problems are you having?• What don’t you know how to do?• What would you like us to go over?

Continue your project.