Scratch 3 Programming Playground by Al Sweigart -- Read -- Imperial Library of Trantor

Index

Cover Titlepage PRAISE FOR SCRATCH PROGRAMMING PLAYGROUND Copyright Dedication About the Author About the Technical Reviewer Acknowledgments Introduction

Who This Book Is For About This Book How to Use This Book Online Resources Errata and Updates

Chapter 1: Getting Started with Scratch

Running Scratch Scratch Desktop: The Offline Editor The Scratch Editor and Sprites The Paint Editor Working with Code Blocks

Adding Blocks Deleting Blocks

Running Programs Showing Off Your Programs Getting Help

The Tutorials Window The See Inside Button

Summary

Chapter 2: Rainbow Lines . . . in Space!

Sketch Out the Design A. Create the Space Backdrop

1. Clean Up and Set the Stage

B. Create Three Bouncing Dots

2. Paint the Dot 3. Add Code for the Dot 1 Sprite 4. Duplicate the Dot 1 Sprite

C. Draw the Rainbow Lines

5. Add the Code for the Drawing Dot Sprite

The Complete Program Turbo Mode Summary

Chapter 3: Maze Runner

Sketch Out the Design A. Make the Cat Walk Around

1. Add Movement Code to the Player Sprite 2. Duplicate the Movement Code for the Cat Sprite

B. Make the Maze Levels

3. Download the Maze Images 4. Change the Backdrop 5. Start at the First Maze

C. Keep the Cat from Walking Through Walls

6. Check Whether the Cat Is Touching the Walls

D. Make a Goal at the End of the Maze

7. Create the Apple Sprite 8. Detect When the Player Reaches the Apple 9. Add the Broadcast Handling Code to the Maze Sprite

The Complete Program Version 2.0: Two-Player Mode

Duplicate the Apple Sprite Modify the Apple2 Sprite’s Code Duplicate the Orange Cat Sprite Modify the Code for the Blue Cat Sprite Go Back to the Starting Position

Cheat Mode: Walk Through Walls

Add the Walk-Through-Walls Code to Orange Cat Add the Walk-Through-Walls Code to Blue Cat

Summary

Chapter 4: Shooting Hoops with Gravity

Sketch Out the Design A. Make the Cat Jump and Fall

1. Add the Gravity Code to the Cat Sprite 2. Add the Ground-Level Code 3. Add the Jumping Code to the Cat Sprite

B. Make the Cat Move Left and Right

4. Add the Walking Code to the Cat Sprite

C. Make a Hovering Basketball Hoop

5. Create the Hoop Sprite 6. Create the Hitbox Sprite

D. Make the Cat Shoot Hoops

7. Create the Basketball Sprite 8. Add the Code for the Basketball Sprite 9. Detect Whether a Basket Is Made 10. Fix the Scoring Bug

The Complete Program Cheat Mode: Freeze the Hoop Summary

Chapter 5: A Polished Brick Breaker Game

Sketch Out the Design A. Make a Paddle That Moves Left and Right

1. Create the Paddle Sprite

B. Make a Ball That Bounces Off the Walls

2. Create the Tennis Ball Sprite

C. Make the Ball Bounce Off the Paddle

3. Add the Bounce Code to the Tennis Ball Sprite

D. Make Clones of the Brick

4. Add the Brick Sprite 5. Clone the Brick Sprite

E. Make the Ball Bounce Off Bricks

6. Add the Bounce Code to the Brick Sprite

F. Make “You Win” and “Game Over” Messages

7. Modify the Tennis Ball Sprite’s Code 8. Create the Game Over Sprite 9. Create the You Win Sprite

The Complete Program Version 2.0: Polishing Time

Draw a Cool Backdrop Add Music Make the Paddle Flash When Hit Add an Animated Entrance and Exit to the Bricks Add a Sound Effect to the Brick Exit Add a Sound Effect to the Tennis Ball Add a Trail Behind the Tennis Ball Add an Animated Entrance for the Game Over Sprite Add an Animated Entrance for the You Win Sprite

Summary

Chapter 6: Asteroid Breaker . . . in Space!

Sketch Out the Design A. Make a Spaceship That Is Pushed Around

1. Create the Spaceship Sprite

B. Make the Spaceship Wrap Around the Edges

2. Add the Wrap-Around Code to the Spaceship Sprite 3. Add the Random-Push Code to the Spaceship Sprite

C. Aim with the Mouse and Fire with the Spacebar

4. Create the Energy Blast Sprite

D. Make Asteroids That Float Around

5. Create the Asteroid Sprite

E. Make Asteroids Split in Two When Hit

6. Add the Asteroid’s Splitting Code 7. Add the Asteroid Blasted Message Code to the Energy Blast Sprite

F. Keep Score and Make a Timer

8. Create the Out of Time Sprite

G. Make the Spaceship Explode If It Is Hit

9. Upload the Explosion Sprite 10. Add the Code for the Explosion Sprite 11. Add the Explode Code to the Spaceship Sprite

Version 2.0: Limited Ammo Cheat Mode: Starburst Bomb Summary

Chapter 7: Making an Advanced Platformer

Sketch Out the Design A. Create Gravity, Falling, and Landing

1. Create the Ground Sprite 2. Add the Gravity and Landing Code 3. Make the Cat Walk and Wrap Around the Stage 4. Remove the Ground Lift Delay

B. Handle Steep Slopes and Walls

5. Add the Steep Slope Code

C. Make the Cat Jump High and Low

6. Add the Jumping Code

D. Add Ceiling Detection

7. Add a Low Platform to the Ground Sprite 8. Add the Ceiling Detection Code

E. Use a Hitbox for the Cat Sprite

9. Add a Hitbox Costume to the Cat Sprite 10. Add the Hitbox Code

F. Add a Better Walking Animation

11. Add the New Costumes to the Cat Sprite 12. Create the Set Correct Costume Block

G. Create the Level

13. Download and Add the Stage Backdrop 14. Create a Hitbox Costume for the Ground Sprite 15. Add the Ground Sprite’s Code 16. Add More Wrap-Around Code to the Cat Sprite

H. Add Crab Enemies and Apples

17. Add the Apple Sprite and Code 18. Create the Crab Sprite 19. Create the Enemy Artificial Intelligence 20. Add the Time’s Up Sprite

Summary

Where to Go From Here Index

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