Introduction to Computer Science with Scratch and App Inventor

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Point your sprite in the direction you want it to move. You can specify an absolute direction or another object on the stage Move your sprite to a specific location on the stage. You can give coordinates or another object on the stage. Glide can be used to make the sprite move more slowly. Change x and y are great commands to use for moving your sprite around the screen. We will use these commands in a later lesson. By combining these blocks, we can make our sprite perform more complex behaviors. Let’s make our sprite “dance” by putting together multiple actions. To build complex behavior, snap blocks together like Legos. To see what your new dance looks like, click once on the group of blocks and watch what happens on the stage When your script runs, the actions on the blocks happened one after the other in the order you have them connected, this is called sequential execution It might be a little hard to see each action individually, because the actions happen very quickly. We can slow things down a little bit using some of the control blocks. These are on the yellow menu: mbrace Game Development Workbook Page 8
Let’s add some yellow wait blocks and see what happens when we run our new script (remember, click on the group of blocks to run the script). You should see the sprite wait between parts of its new dance. You can change where you put the wait and you can also change how long you wait by changing the number in the block. [HINT: for a shorter wait you can use a fraction of a second, 0.5 is half a second] Every time we click the group of blocks, our sprite will do his dance. We can use another control block to make the sprite keep dancing. Drag a forever block into your script. The forever block can go around a group of other blocks, and we want to arrange it so that it goes around our entire dance script. Now click on the big group of blocks and see what happens – your sprite should keep dancing. This is called LOOPING. The forever block is a loop that repeats a group of blocks over and over again until we tell it to stop. Inside the loop, the individual actions will still happen sequentially in the order they appear. When the last block finishes, the loop will start all over with the first one again. Sometimes, we don’t want to loop forever, but we do want to do a set of actions more than once. Scratch has another kind of loop that lets us repeat a set of blocks a specific number of times. It is up to you to pick the kind of loop that will work best in your program. Play around with both the forever loop and the counter loop to see how they work. mbrace Game Development Workbook Page 9
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: The direction that your sprite move
Page 11 and 12: Changing the Background on the Stag
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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