- Scratch 1.4
- Copyright
- Credits
- About the Author
- About the Reviewer
- Preface
- 1. Welcome to Scratch!
- 2. Installation
- 3. Start Scratching
- The interface at a glance
- Time for action - first step
- Time for action - save your work
- Set the cat in motion
- Time for action - a big step
- Time for action - in motion forever
- Time for action - get out of the corner
- Add sprites to the stage
- Time for action - spin sprite spin
- Sometimes we need inspiration
- Time for action - spinner
- Time for action - broadcast a message
- Browse the Scratch community
- Time for action - create an account
- Time for action - download a project
- Summary
- 4. Graphics and Slideshows
- Happy birthday wishes
- Time for action - paint a happy birthday sprite
- Time for action - paint the stage
- Time for action - address the card
- Time for action - hide all sprites
- Time for action - display happy birthday
- Time for action - roll call
- Time for action - give me an "M"
- Time for action - give me another "M"
- Time for action - set first M straight
- Time for action - give mom flowers
- Build a photo slideshow
- Time for action - insert a title screen
- Time for action - import photos from disk
- Time for action - flip through the photos
- Time for action - present your show
- Summary
- 5. Storytelling
- Barnyard humor
- Time for action - create TOC
- Time for action - add new pages
- Time for action - hide the sprites
- Time for action - import the horse
- Time for action - the horse talks
- Time for action - revise the horse talks exercise
- Time for action - a horse whinnies
- Time for action - bring out the dog
- Time for action - stay dog
- Time for action - turn to the left
- Time for action - hit the cymbals
- Time for action - applause, please
- Time for action - joke, please
- Time for action - hide TOC
- Time for action - enter dog
- Time for action - exit dog
- Time for action - show TOC
- Summary
- 6. Arcade Games
- Troll pong
- Time for action - open the sample pong project
- Time for action - change direction
- Time for action - remove the random turn
- Time for action - beach ball pong
- Time for action - add new paddle controls
- Time for action - add background music
- Time for action - paddle meets ball
- Time for action - add a score variable
- Time for action count the paddle's steps
- Time for action reach for a new level
- Time for action fix the script
- Time for action - count the levels
- Time for action - enter project notes
- Summary
- 7. Games of Fortune
- Fortune-teller
- Time for action - create a list of questions
- Time for action - import a list of fortunes
- Time for action - tell me a fortune
- Time for action - force a positive fortune
- Time for action - my fortune is what?
- Do you have a question?
- Time for action - ask your question
- Time for action - add it to the list
- Time for action - join two sentences
- Summary
- 8. Math and Finance
- Double it or lump sum?
- Time for action - calculate the double amount
- Time for action - set user-defined variables
- Time for action slow it down
- Time for action set the graph’s origin
- Time for action - draw a graph
- Time for action connect the dots
- Time for action - fix the graph
- Time for action - draw the x and y axis of the grid
- Time for action - label newAmount
- Time for action - calculate interest on lump sum
- Next steps
- Summary
- 9. Share!
- 10. Real-world stimuli
- Import webcam pictures
- Time for action - say cheese
- PicoBoard—what is it?
- Install the PicoBoard
- Capture sound input
- Time for action - switch backgrounds on sound
- Time for action use sound to change the sprite's looks
- Click for the next slide
- Time for action - click for the next slide
- Time for action - wait until button not pressed
- Step into the light, please
- Time for action -
- Control motion with the slider
- Time for action - slide sensor
- Create circuits
- Time for action - complete the circuit
- Time for action - measure resistance
- Watch all sensor values
- LEGO WeDo support
- Summary
- A. Scratch Resources
In Chapter 6, we learned how easy it is to create projects that incorporate dynamic information using variables. However, variables have a limitation; they store only one value at a time. Sometimes, we want a variable to store multiple values.
Welcome to lists. In Scratch, a list allows us to associate one list (a variable) with multiple items or values in much the same way we create a list before going to the grocery store.
In this chapter, we will take a trip to the fortune-teller to demonstrate lists, and I predict you'll learn how to:
- Store and retrieve information in lists
- Keep track of items in a list by using a counter
- Identify intervals using the mod block
- Use if/else control blocks to make decisions
- Ask the user a question and store the keyboard input
That's a lot to process, but we can do it.
Most of us enjoy a good circus, carnival, or county fair. There's fun, food, and fortunes. Aah, yes, what would a fair be without the fortune-teller's tent? By the end of the chapter, you'll know everything you need to spin your fortunes and amaze your friends with your wisdom.
Before we start the first exercise, create a new project and add two sprites. The first sprite will be the seeker. The second sprite will be the teller. Choose any sprites you want. My seeker will be a clam and my teller will be a snowman. If you want to add a background, go ahead.
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