Introduction to Computer Science with Scratch and App Inventor
Introduction to Computer Science with Scratch and App Inventor
Introduction to Computer Science with Scratch and App Inventor
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To s<strong>to</strong>p a forever block, click the red s<strong>to</strong>p sign above<br />
the stage.<br />
Next <strong>to</strong> the s<strong>to</strong>p sign, there is a green flag but<strong>to</strong>n.<br />
You can have your program start by clicking the<br />
green flag rather than clicking on the blocks in your<br />
script. Once we learn how <strong>to</strong> do this, we will use it<br />
for most of our scripts.<br />
Drag a when (Green Flag) clicked block on<strong>to</strong><br />
the <strong>to</strong>p of your forever loop. Notice that the<br />
green flag block is shaped differently from the<br />
other blocks we have been using. Blocks <strong>with</strong><br />
a curved <strong>to</strong>p don’t allow other blocks <strong>to</strong><br />
attach <strong>to</strong> the <strong>to</strong>p. These blocks are starting<br />
points for our programs. Later on we’ll learn<br />
about some of the other curved blocks as<br />
well.<br />
Now, you can click the green flag <strong>to</strong> start<br />
running your script <strong>and</strong> click the s<strong>to</strong>p sign <strong>to</strong><br />
s<strong>to</strong>p.<br />
Why do we want <strong>to</strong> use the green flag? It might<br />
not see very exciting right now.<br />
If you click the full screen icon in the upper right<br />
h<strong>and</strong> corner of your screen, your stage will take<br />
up the whole screen. In this mode, you don’t<br />
have access <strong>to</strong> the blocks <strong>to</strong> click on, but you will<br />
have the green flag <strong>and</strong> the red s<strong>to</strong>p sign.<br />
Also, as we add more things <strong>to</strong> our projects, you<br />
will see how the green flag allows us <strong>to</strong><br />
coordinate more complicated programs.<br />
mbrace Game Development Workbook Page 10