Module Introduction to Scratch

Instructor: Dr. Vlasov

EGN-1002 Introduction to Scratch

Slide: 1 Lecture is licensed under a Creative Commons Attribution 2.0 License.

EGN-1002 Circuit analysis

Module Introduction to

Scratch




Introduction to Scratch

•  Intro to visual programming environment •  Intro to programming with multimedia •  Story-telling, music-making, game-making •  Intro to programming concepts: objects,

attributes, sequence, repetition, conditions, events, I/O




What is Scratch

Use of scratch allows you to: •  Create solutions to problems using computers •  Study information •  Invent algorithms •  Write programs to implement the algorithms •  Reuse a lot of existing program and machine parts

Scratch is a free programmable toolkit that enables users to create their own games, animated stories, and interactive art and share their creations with one another over the Internet.




Start Scratch • Open web browser • Navigate to: http://scratch.mit.edu




Scratch start window

Stage area

Sprite list

Scripts area

Blocks palette

Your construct your script here by putting together command blocks from the “Blocks palette”.

This is where the result of your program execution will be seen

List of existing or created objects which are used in your script.




What Scratch can do

•  Colors •  Sounds •  Locations in 2D space •  Sprites •  Costumes •  Variables (to remember the state of things) •  Events: that are broadcast for communication

Elements of Scratch: objects

•  Can make cartoons •  Can create stories •  Can create video games




Your first script

•  Make sure to have a sprite selected in the “Sprite list” •  Drag shown blocks into “Script area”.

•  Click the sprite in the “Stage area”




Add new stage




Stage dimensions

These are x- and y- coordinates for the stage:

x = 240 y = 180

x = 240 y = -180

x = -240 y = -180

x = -240 y = 180

x = 0 y = 0

x

y




Add new sprite




Loop constructs in Scratch

•  Repeat N times •  Repeat forever •  Repeat forever if some condition exists




Compose program in Scratch




Compose scripts in Scratch Examples of loops and “IF” operators:




Scratch assignment No. 1 Using Scratch (scratch.mit.edu) design algorithm and script which would perform

the following: 1.  Draw a car. 2.  Draw a smiley face. 3.  Draw a house. 4.  Draw a sailboat. 5.  Draw initials of the team leader. 6.  Draw a robot face 7.  Draw a 6-leaf flower 8.  Draw 5 squares with crosses

•  Save your script on your local computer. •  Prepare brief printed MS-Word report with problem statement, solution description,

working script, and Scratch screen shots. •  Upload the script and the report to your group file exchange section on the

BlackBoard. •  Each team should be able to present (show on the screen) and explain working

scripts to the audience in class. •  The printed report shall be turned in.




Scratch assignment No. 2 Using Scratch (scratch.mit.edu) design algorithm and script which

would display: 1.  working digital clock 2.  working analog clock 3.  stop watch

Create your own sprites and your own background if needed.

•  Save your script on your local computer. •  Prepare brief printed MS-Word report with problem statement, solution

description, working script, and Scratch screen shots. •  Upload the script and the report to your group file exchange section on the






Scratch assignment No. 3 Using Scratch (scratch.mit.edu) design algorithm and script which

would draw a graph of function: f(x) = A sin(ax + b)

where A, a, and b are parameters which can be entered from keyboard. Create your own sprites and your own background if needed.








Scratch assignment No. 5

•  Save your script on your local computer. •  Prepare brief printed MS-Word report with problem statement, solution description,

working script, and Scratch screen shots. •  Upload the script and the report to your group file exchange section on the BlackBoard. •  Each team should be able to present (show on the screen) and explain working scripts to the

audience in class. •  The printed report shall be turned in.

Using Scratch (scratch.mit.edu) design algorithm and script which would perform the following functions:

1.  Rotate the vehicle with an arm until it finds (touches) the object

2.  “Grab” the object 3.  Rotate the vehicle with the object 180 degrees 4.  Release the object 5.  Move the vehicle off the object Create your own sprite and your own background.

vehicle

object





Using Scratch (scratch.mit.edu) design an algorithm and a script which would move chosen sprite (a ball) in random direction inside a rectangular box and bouncing off its walls.

You may create your own sprites and your own background.









Using Scratch (scratch.mit.edu) design an algorithm and a script which would animate your team name.

Maximum length 30 seconds. Your scene needs to have theme music and a stage that reflects your personality, interests, and essence. Include suitable animation for the letters.

You may create your own sprites and your own background.





Documents

Module Introduction to Scratch