Introduction to Computer Science with Scratch and App Inventor

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To stop a forever block, click the red stop sign above the stage. Next to the stop sign, there is a green flag button. You can have your program start by clicking the green flag rather than clicking on the blocks in your script. Once we learn how to do this, we will use it for most of our scripts. Drag a when (Green Flag) clicked block onto the top of your forever loop. Notice that the green flag block is shaped differently from the other blocks we have been using. Blocks with a curved top don’t allow other blocks to attach to the top. These blocks are starting points for our programs. Later on we’ll learn about some of the other curved blocks as well. Now, you can click the green flag to start running your script and click the stop sign to stop. Why do we want to use the green flag? It might not see very exciting right now. If you click the full screen icon in the upper right hand corner of your screen, your stage will take up the whole screen. In this mode, you don’t have access to the blocks to click on, but you will have the green flag and the red stop sign. Also, as we add more things to our projects, you will see how the green flag allows us to coordinate more complicated programs. mbrace Game Development Workbook Page 10
Changing the Background on the Stage Now that everyone has a dancing sprite, let’s make the background nicer than plain old white. We can change things about the stage just like we can change our sprite. 1 Click Here 2 Check out full screen mode and watch your sprite dance across the screen! Use the green flag and red stop sign to start and stop your program! So far we have used blocks from two different menus: the motion menu (blue blocks) and the control menu (yellow blocks). Whenever you use a new menu, it is always a good idea to read through the blocks available. You never know when a new command will come in handy! You can only modify one sprite or the background at a time. To make changes to the stage, click on the picture of the stage in the sprite list underneath the stage. The sprite information panel at the top will change to show that we are working with the stage now instead of our sprite. We can pick a new background from a library just like we picked a new sprite. First, click on the Backgrounds tab Next, click on the Import button mbrace Game Development Workbook Page 11
Page 1 and 2: Introduction to Computer Science wi
Page 3 and 4: LESSON 1: Getting Started with Scra
Page 5 and 6: I decided to pick a dinosaur. You c
Page 7 and 8: The direction that your sprite move
Page 9: Let’s add some yellow wait blocks
Page 13 and 14: To use an if block to control the m
Page 15 and 16: Costumes and Animation Now that you
Page 17 and 18: Other useful blocks are the say and
Page 19 and 20: ? Now we know how to tell when the
Page 21 and 22: Here is one script that works. To m
Page 23 and 24: After you create a variable, you wi
Page 25 and 26: Winning, Losing, and Game Play Our
Page 27 and 28: You might have noticed that when th
Page 29 and 30: Click the checkbox next to timer to
Page 31 and 32: Scratch Review Now you have built y
Page 33 and 34: App Inventor Interface The App Inve
Page 35 and 36: The first thing that we will do is
Page 37 and 38: To add the mole to our program, we
Page 39 and 40: Your Blocks Editor Screen should lo
Page 41 and 42: We know that our X and Y locations
Page 43 and 44: Our mole shows up in the emulator,
Page 45 and 46: The last thing we need is the value
Page 47 and 48: Team Project Worksheet We have lear

Introduction to Computer Science with Scratch and App Inventor

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