book

Scratch 3 Programming Playground

Name: Scratch 3 Programming Playground
Author: Al Sweigart
ISBN: 9781718500211

by Al Sweigart

January 2021

Beginner

288 pages

4h 44m

English

No Starch Press

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Cover
Titlepage
PRAISE FOR SCRATCH PROGRAMMING PLAYGROUND
Copyright
Dedication
About the Author
About the Technical Reviewer
Acknowledgments
Introduction
Who This Book Is ForAbout This BookHow to Use This BookOnline ResourcesErrata and Updates
Chapter 1: Getting Started with Scratch
Running ScratchScratch Desktop: The Offline EditorThe Scratch Editor and SpritesThe Paint EditorWorking with Code BlocksAdding BlocksDeleting BlocksRunning ProgramsShowing Off Your ProgramsGetting HelpThe Tutorials WindowThe See Inside ButtonSummary
Chapter 2: Rainbow Lines . . . in Space!
Sketch Out the DesignA. Create the Space Backdrop1. Clean Up and Set the StageB. Create Three Bouncing Dots2. Paint the Dot 3. Add Code for the Dot 1 Sprite4. Duplicate the Dot 1 SpriteC. Draw the Rainbow Lines5. Add the Code for the Drawing Dot SpriteThe Complete ProgramTurbo ModeSummary

Chapter 3: Maze Runner
Sketch Out the DesignA. Make the Cat Walk Around1. Add Movement Code to the Player Sprite2. Duplicate the Movement Code for the Cat SpriteB. Make the Maze Levels3. Download the Maze Images4. Change the Backdrop5. Start at the First MazeC. Keep the Cat from Walking Through Walls6. Check Whether the Cat Is Touching the WallsD. Make a Goal at the End of the Maze7. Create the Apple Sprite8. Detect When the Player Reaches the Apple9. Add the Broadcast Handling Code to the Maze SpriteThe Complete ProgramVersion 2.0: Two-Player ModeDuplicate the Apple SpriteModify the Apple2 Sprite’s CodeDuplicate the Orange Cat SpriteModify the Code for the Blue Cat SpriteGo Back to the Starting PositionCheat Mode: Walk Through WallsAdd the Walk-Through-Walls Code to Orange CatAdd the Walk-Through-Walls Code to Blue CatSummary
Chapter 4: Shooting Hoops with Gravity
Sketch Out the DesignA. Make the Cat Jump and Fall1. Add the Gravity Code to the Cat Sprite2. Add the Ground-Level Code3. Add the Jumping Code to the Cat SpriteB. Make the Cat Move Left and Right4. Add the Walking Code to the Cat SpriteC. Make a Hovering Basketball Hoop5. Create the Hoop Sprite6. Create the Hitbox SpriteD. Make the Cat Shoot Hoops7. Create the Basketball Sprite8. Add the Code for the Basketball Sprite9. Detect Whether a Basket Is Made10. Fix the Scoring BugThe Complete ProgramCheat Mode: Freeze the HoopSummary
Chapter 5: A Polished Brick Breaker Game
Sketch Out the DesignA. Make a Paddle That Moves Left and Right1. Create the Paddle SpriteB. Make a Ball That Bounces Off the Walls2. Create the Tennis Ball SpriteC. Make the Ball Bounce Off the Paddle3. Add the Bounce Code to the Tennis Ball SpriteD. Make Clones of the Brick4. Add the Brick Sprite5. Clone the Brick SpriteE. Make the Ball Bounce Off Bricks6. Add the Bounce Code to the Brick SpriteF. Make “You Win” and “Game Over” Messages7. Modify the Tennis Ball Sprite’s Code8. Create the Game Over Sprite9. Create the You Win SpriteThe Complete ProgramVersion 2.0: Polishing TimeDraw a Cool BackdropAdd MusicMake the Paddle Flash When HitAdd an Animated Entrance and Exit to the BricksAdd a Sound Effect to the Brick ExitAdd a Sound Effect to the Tennis BallAdd a Trail Behind the Tennis BallAdd an Animated Entrance for the Game Over SpriteAdd an Animated Entrance for the You Win SpriteSummary
Chapter 6: Asteroid Breaker . . . in Space!
Sketch Out the DesignA. Make a Spaceship That Is Pushed Around1. Create the Spaceship SpriteB. Make the Spaceship Wrap Around the Edges2. Add the Wrap-Around Code to the Spaceship Sprite3. Add the Random-Push Code to the Spaceship SpriteC. Aim with the Mouse and Fire with the Spacebar4. Create the Energy Blast SpriteD. Make Asteroids That Float Around5. Create the Asteroid SpriteE. Make Asteroids Split in Two When Hit6. Add the Asteroid’s Splitting Code7. Add the Asteroid Blasted Message Code to the Energy Blast SpriteF. Keep Score and Make a Timer8. Create the Out of Time SpriteG. Make the Spaceship Explode If It Is Hit9. Upload the Explosion Sprite10. Add the Code for the Explosion Sprite11. Add the Explode Code to the Spaceship SpriteVersion 2.0: Limited AmmoCheat Mode: Starburst BombSummary
Chapter 7: Making an Advanced Platformer
Sketch Out the DesignA. Create Gravity, Falling, and Landing1. Create the Ground Sprite2. Add the Gravity and Landing Code3. Make the Cat Walk and Wrap Around the Stage4. Remove the Ground Lift DelayB. Handle Steep Slopes and Walls5. Add the Steep Slope CodeC. Make the Cat Jump High and Low6. Add the Jumping CodeD. Add Ceiling Detection7. Add a Low Platform to the Ground Sprite8. Add the Ceiling Detection CodeE. Use a Hitbox for the Cat Sprite9. Add a Hitbox Costume to the Cat Sprite10. Add the Hitbox CodeF. Add a Better Walking Animation11. Add the New Costumes to the Cat Sprite12. Create the Set Correct Costume BlockG. Create the Level13. Download and Add the Stage Backdrop14. Create a Hitbox Costume for the Ground Sprite15. Add the Ground Sprite’s Code16. Add More Wrap-Around Code to the Cat SpriteH. Add Crab Enemies and Apples17. Add the Apple Sprite and Code18. Create the Crab Sprite19. Create the Enemy Artificial Intelligence20. Add the Time’s Up SpriteSummary
Where to Go From Here
Index

Content preview from Scratch 3 Programming Playground

2 Rainbow Lines . . . in Space!

Alphabet-i n this chapter, you’ll create a cool-looking animation: a rainbow V that flies through space and leaves colorful trails behind. This program was inspired by the demoscene, a subculture of elite programmers who made amazing graphical programs starting in the 1980s.

Demosceners made beautiful, elaborate programs called demos that showed off their artistic, musical, and programming skills. But most amazing of all, these programs were tiny—just a few kilobytes! The program we’ll write isn’t quite as small, but ...

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ISBN: 9781098128432

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Scratch 3 Programming Playground

by Al Sweigart

2 Rainbow Lines . . . in Space!

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.