Transcript tenSessionScratchL9.ppt

Scratch Programming
Session 9 of 10
Review 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
• How to include an Element of time in the game:
• Count-Down Timer:
– Forever
– Wait 1 second
– Timer=Timer-1
• Time Elapsed:
– Forever
– Wait 1 Second
– Timer=Timer+1
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.