Book Image

Scratch Cookbook

By : Brandon Milonovich
Book Image

Scratch Cookbook

By: Brandon Milonovich

Overview of this book

Scratch 2.0 is an easy to use programming language that allows you to animate stories and create interactive games. Scratch also gives you the capability of using programming to calculate complicated calculations for you. Scratch Cookbook will lead you through easy-to-follow recipes that give you everything you need to become a more advanced programmer. Scratch Cookbook will take you through the essential features of Scratch. You'll then work through simple recipes to gain an understanding of the more advanced features of Scratch. You will learn how to create animations using Scratch. Sensory board integration (getting input from the outside environment) will also be covered, along with using Scratch to solve complicated and tedious calculations for you. You'll also learn how to work through the exciting process of project remixing where you build on the work of others. Scratch Cookbook will give you everything you need to get started with building your own programs in Scratch that involve sounds, animations, and user interaction.
Table of Contents (17 chapters)
Scratch Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Basic broadcasting and receiving


Broadcasting and receiving is conceptually one of the most challenging ideas we've gotten to so far. That's because the idea is slightly more abstract than some of the other things we've discussed. Let's first talk a little about the principle it is built on, and then go into how it works in Scratch.

Getting ready

We have two separate ideas to think about. The first is the idea of broadcasting. Think of it as a radio station that sends out a signal that only radios can hear. If you are walking around outside, you're not going to hear anything. If you turn on a radio though, you can hear everything being broadcast. Receiving is kind of like the radio. It listens for a specific signal being broadcast, and then will trigger the code placed under it.

In Scratch, we have two blocks that act in this way. The broadcast block and the when I receive block, both of which are Events blocks. We'll talk more about these in the How it works… section coming up.

For this recipe...