Programming with Scratch

1. MAGIC CAMP/ Summer 2018/DAY 1 (Credit for Patrick Woessner)
Programming with
Scratch
Lesson 1: Intro to Programming
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2. Computer Programming?
● What is programming?
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● The process of writing, testing, and maintaining the
source code of computer programs.
Telling the computer what to do
● Why learn to program?
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Develops logic and problem-solving skills
Improves attention to detail
It’s fun!
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3. Anyone Can Program!
● New tools, like Scratch, allow ANYONE to create
computer programs without learning complicated
syntax.
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4. Programming with Scratch
START HERE
❑ Go to the Scratch website:
http://scratch.mit.edu
❑ Sign into your account.
❑ Click on the “Create” tab located at the
top left of the browser to start a new
project.
❑ Time to explore! Try clicking on
different parts of the Scratch interface
to see what happens.
❑ Play with different Scratch blocks!
Drag and drop Scratch blocks into the
scripting area. Experiment by clicking
on each block to see what they do or
try snapping blocks together.
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6. In Class Assignment 1
● After introducing the Scheme of Scratch, students
will start with step-by-step projects on
https://scratch.mit.edu/projects/editor
● Students will try to experiment and explore a
dance video by the help of instructors and step-
by-step project guideline “Getting Started with
Scratch”.
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7. MAGIC CAMP/ Summer 2018/DAY 1 (Credit for Patrick Woessner)
Programming with
Scratch
Lesson 2: Scratch Syntax Part 1
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8. Statements
● In programming, a statement is simply a directive
that tells the computer to do something. Think of it
as a command or an instruction.
● In Scratch, any block whose label reads like a
command is a statement.
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9. Boolean Expressions
● Sometimes, you only want a statement to be
executed under certain conditions. Such
conditions are defined in terms of Boolean
expressions.
● In programming, a Boolean expression is an
expression that is either true or false. In Scratch,
any block shaped like an elongated diamond is a
Boolean expression.
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10. Boolean Expressions
● One such block is:
After all, it is either true that the mouse button is
down or it is false.
● Another such block is:
After all, it is either true that some number is less
than another number or it is false.
● With Boolean expressions can we construct
conditions.
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11. Conditions
● In programming, a condition is something that
must be true in order for something to happen.
● A condition is thus said to "evaluate to true" or
"evaluate to false."
● In Scratch, any block whose label says "if,"
"when," or "until" is a sort of conditional
construct.
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12. Conditions
● If Construct: Instruct a sprite to say hello only
if, say, the user has depressed the mouse
button:
● If-Else Construct: Instruct a sprite to say hello or
goodbye, depending on whether the user has
depressed the mouse button:
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13. Conditions (In Class Assignment)
● If-Else Construct: Write an instruction to instruct a
sprite to react when the spirit is touched by mouse
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Steps:
1 - Choose a sprite from the sprite library or upload your own sprite.
2-

14. Conditions
● When Construct: Instruct a sprite to do
something when an event occurs:
● When Construct: Instruct a sprite to wait to
do something until a condition is true:
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15. Loops
● In programming, a loop can induce multiple
executions of statements.
● In Scratch, any block whose label begins with
"forever" or "repeat" is a looping construct.
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16. Loops (In Class assignment)
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Follow me

17. MAGIC CAMP/ Summer 2018/DAY 1 (Credit for Patrick Woessner)
Programming with
Scratch
Lesson 3: Scratch Syntax Part 2
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18. Variables
● In programming, a variable is a placeholder
for some value, much like x and y are popular
variables in algebra.
● In Scratch, variables are represented with
blocks shaped like elongated circles,
uniquely labeled by you.
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19. Variables(In Class Assignment)
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2 - Change Count Sprit to count only in odd
numbers.
3 - Change Counter Sprit to count only in even
numbers.

20. Variables(In Class Assignment)
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4- This script alternates costumes and sounds.
Modify it so that it has a meow sound and
costume after odd numbers and a dog sound
and costume after even numbers.

21. Threads
● In programming, a thread is like a mini- program within
a program that can execute at the same time as other
threads.
● In Scratch, any block whose label begins with "when"
essentially marks the start of a thread.
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22. Events
● An event is a signal from one thread to
another.
● Blocks whose labels begin with "broadcast"
signal events whereas blocks whose labels begin
with "when" handle events.
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23. Copter Game Flight Code
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24. Copter Game—One Level
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25. Adding a Level
● Levels can be added using threads and
events.
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26. Homework
● Complete Your First Game Project
● You may wish to use the Copter Game and
Levels program as resources.
● Completed projects need to submitted to the
MAGIC CAMP website by the due date.
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