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scratch programming playground chapter 9

Curso de MS-Excel 365 – Módulo Intensivo
13 de novembro de 2020

scratch programming playground chapter 9

The cat also needs to walk left and right using the WASD keys, so add the following script to the Cat sprite: This code is very straightforward: pressing A points the cat to the left (-90) and moves the x position by -6 (to the left); pressing D makes the cat point to the right and moves the x position by 6 (to the right). Because the hitbox is a simple rectangle that doesn’t have protruding parts that could “catch” on platforms, like the cat’s head and whiskers could, the game will behave in a more natural way. Start. If you make a mistake, click the Undo button at the top of the Paint Editor to undo the deletion. Click the green flag to test the code so far. You probably won’t know all the answers off the top of your head, but you can explore the Scratch editor to figure out the answers. This code is a little complicated, but we’ll walk through it step-by-step. Click the green flag to test the code so far. A book that makes Scratch exciting. When the Apple sprite finds a place that is not touching the Ground sprite, it becomes visible again with set ghost effect to 0. How is a dark purple custom block’s input like a variable? Click the green flag to test the code so far. We’ll use this code in a few places in the scripts we’ve written, so let’s make a custom block. Go to scratch.mit.edu. The Cat sprite that a Scratch project starts with has two costumes named costume1 and costume2. JavaScript is not quite as easy, but it’s the language used for web apps that run in your browser. We need to change the code so that if the Cat sprite is jumping up when it touches the Ground sprite, the cat stops rising because it bumps its head. Then, in the Scratch editor, click the Cat sprite’s Costumes tab. Open the sprite’s Info Area and rename the sprite Ground. The background parts of the image are already deleted, so you just need to click the Upload costume from file button on the Costumes tab to add it. Modify the Crab sprite script that checks whether the player is pressing the A key or D key to match the following code. Let’s edit the code in the define walk custom block to increase the frame variable by an amount calculated from frames per costume. As with the Cat sprite, this code lets the Crab sprite walk left and right. 2) If you are using the offline editor, click on File > Share To Website. If the player has 0 apples, the Crab sprites will say “Apples!” but will not subtract 1 from Apples Collected. When we want to call the new walk block, we’ll have to define that input with a number of steps to take. Add a short, low platform to the Ground sprite’s costume, as shown in the following figure. These books are great for the next step of your journey to become a master programmer! Scratch Programming Playground is free to read online under a Creative Commons license. The easiest way to do this is to click the Select tool in the Paint Editor. www.ineasysteps.com Scratch is a programming language that is widely used on the Raspberry Pi and in schools and colleges. The cat can walk on the ground, and now walls will stop the cat from moving through them. Click the green flag to test the code so far. If you’re lost, open platformer6.sb in the resources ZIP file and continue reading from this point. We can control the costume that is displayed by using a math trick: because 8 mod 8 = 0, a frame value of 8 will show the first walking costume! Difficulty. More Scratch Quizzes. The problem with the code is in the custom handle ground block. The backdrop shows what the level looks like, while the Ground sprite acts as its hitbox. Content Chapter 1: Getting Started with Scratch Chapter 2: Rainbow Lines in Space! Let’s add some enemies that the player must avoid. Because the Stage backdrop and the Ground sprite’s costume came from the same image file, you can do this by moving the Ground sprite to the coordinates (0, 0). Author by: Al Sweigart: Genre: Juvenile Nonfiction: Editor: No Starch Press: Hardcover: 288 Pages: ISBN-13: 9781593277628: eBook Bestseller in [pdf] [kindle] [epub] [tuebl] [mobi] [audiobook], New Releases >> Scratch Programming Playground . The free Scratch programming environment gives everyone an easy way to learn programming skills. Press the A and D keys to make the cat walk up and down the slopes. The “change pen color” block causes the rainbows. The great thing about Scratch is that it provides you with unlimited possibilities for the types of games you can make. The Platformer game code is based on the Cat sprite touching the Ground sprite. Make sure the cat bumps into the platform but does not go above it. This course (and supplemental book) covers the creation of several classic games like brick Breaker, Snake, and Fruit Ninja. Let’s edit two of the existing Cat sprite scripts to add the in air variable that limits how high the cat can jump. Enter the requested information. The define handle ground block should now appear in the Scripts Area. Then click the red stop sign and save your program. In the Scratch game in this chapter, the cat will play the part of Mario or Luigi. But now the problem is that the Cat sprite can walk up the steep slope on the left as easily as it can walk up the gentle slope on the right. Want to … The code for this program is too large to list the complete code in this book. The game wouldn’t be very challenging if all the player had to do was jump around and collect apples. If it is, this will give the Cat sprite a velocity of 14—that is, the Cat sprite will be moving up. At this point, the sprites are becoming overcrowded with lots of different scripts. The frames per costume variable keeps track of how fast or slow the animation runs. Modify the set correct costume code to look like the following: Notice that the numbers in the floor of 1 + frame mod 2 blocks have also changed. Next, we have to edit the handle ground call in this script. The handle ground y velocity > 0 block sets the moving up input to true if the y velocity is greater than 0 (that is, if the sprite is jumping and moving up). Then the Apple sprite waits until the Cat sprite touches it. No problem, just write some code. The Cat sprite has some cool animations, and the backdrop looks like a real video game. If you’re lost, open platformer4.sb in the resources ZIP file and continue reading from this point. If you'd like to support the author, you can purchase a print or ebook. Chapter 0 - Introduction; Chapter 1 - Getting Started with Scratch; Chapter 2 - Rainbow Lines in Space! To keep track of the frames, create two For this sprite only variables named frame and frames per costume. This code needs to run so fast that the player only sees the sprite on top of the ground, not in it. The player will be under pressure to grab apples as quickly as possible instead of playing it safe. After selecting an area, press DELETE to remove that piece. If y velocity is not greater than 0, then the sprite is either falling down or still, causing the moving up input to be set to false. Uses a ground sprite that the player stands on, Uses dark purple custom blocks with the Run without screen refresh option enabled, Has ceiling detection so the player bumps their head on low platforms, Has detailed animations for walking, jumping, and falling, Implements AI for enemies so they move around on their own, That wraps it up for this book, but don’t let that stop you from continuing your programming adventure. scratch programming playground learn to program by making cool games Sep 25, 2020 Posted By Patricia Cornwell Ltd TEXT ID 66833f66 Online PDF Ebook Epub Library management 8th edition by jobber david lancaster geoffrey prentice hall2011 paperback 8th edition if you ally compulsion such a referred scratch programming playground learn to program by making cool games ebook that will give … With these two code sections, the cat will fall down, hit the ground, and then rise if necessary, eventually settling on top of the Ground sprite. Click the green flag to test the code so far. Qty: Add To Wishlist. The repeat until not touching Ground block continues lifting the sprite until it is no longer sunk into the Ground sprite. The handle ground block goes where the repeat until not touching Ground blocks were, and that loop is moved under define handle ground. Then click the red stop sign and save your program. The Ground sprite represents any solid part that the cat can’t move through, including ceilings. Get ready to destroy asteroids, shoot hoops, and slice and dice fruit! Scratch, the colorful drag-and-drop programming language, is used by millions of first-time learners, and in Scratch Programming Playground, you’ll learn to program by making cool games. This code means “the sprite has been lifted up by 8 but it’s still touching the Ground sprite, so this must be a steep slope.” In that case, we need to undo the lift and the walking movement. By the time you reach Chapter 9, you’ll be able to make an advanced platformer game with more complex jumping and falling. The advanced Platformer game is the most elaborate and complex project in this book. When the cat falls down the pit, it wraps around the Stage and reappears at the top. A Scratch guide that goes beyond basic games and into some instructional depth. Learn to Program by Making Cool Games. While Scratch is primarily designed for 8- to 16-year-olds, it’s used by people of all ages, including younger children with their parents and college students learning their first programming language. If your program isn’t working and you can’t figure out why, load the project file platformer1.sb2 from the resources ZIP file. The other if then block wraps the Cat to the left edge of the Stage if it’s on the right edge (that is, its x position is greater than 230.). Get ready to destroy asteroids, shoot hoops, and slice and dice fruit! 3. griffpatch has also made costumes for standing, jumping, and falling. (All my puns are intended.). Otherwise, the Ground sprite’s costume won’t line up perfectly over the backdrop. Scratch Programming Playground Author: Al Sweigart Publisher: No Starch Press Pages: 288 ISBN: 978-1593277628 Print: 1593277628 Kindle: B01LYJQVET Audience: Kids and adults Rating: 4.5 Reviewer: Lucy Black. Scratch, the colorful drag-and-drop programming language, is used by millions of first-time learners, and in Scratch Programming Playground, you'll learn to program by making cool games. But in many platform games, the player can do a short jump by pressing the jump button quickly or jump higher by holding down the jump button. For example, 7 / 3 = 2 remainder 1, so 7 mod 3 = 1 (the remainder part). With Scratch Programming Playground, you’ll make a game of it! Try to answer the following practice questions to test what you’ve learned. This is how the cat stays on top of the ground, no matter what the shape of the Ground sprite is. This calculation refers to costumes by their numbers, which are based on their order in the Costumes tab. Drag the cat up with the mouse and let go. Click the Ground sprite’s Costumes tab. If we put y velocity > 0 in the if then block instead of moving up, then the cat would end up rising above the ceiling instead of bumping against it. Now let’s change the plain white background into a real level. Remember that both conditions—key w pressed and in air < 8—must be true for the code inside the if then block to run. There’s so much that you can do with Scratch, it’s hard to know where to start. Play as. In the Scratch game in this chapter, the cat will play the part of Mario or Luigi. Make sure the cat falls and sinks into the ground a bit and then slowly lifts out of it. But in air will start increasing when the Cat sprite is jumping or falling. Click File Upload from your computer in the Scratch editor to load the file, and continue reading from this point. But if ground lift = 8, the repeat until loop stops looping. Click the gray triangle next to Options to expand the window, and click the button next to Add boolean input. - Selection from Scratch Programming Playground [Book] These costume switches will be handled with the dark purple custom blocks that have the option Run without screen refresh checked, so the hitbox costume will never be drawn on the screen. Scratch Programming Playground is a kid-friendly introduction to coding where readers use Scratch to make their own computer games. Create a Scratch Account Before you start programming, you will need to create a Scratch account. This will put it inside the ground when moved to the right edge of the Stage, so an if then block checks for this condition and sets the y position to 5. With the walking code done, let’s add jumping. You can make the lines thicker by using the Line width slider in the bottom-left corner of the Paint Editor. Scratch Programming Playground, 2nd Edition (Scratch 3) Coming Soon! Click the green flag to test the code so far. 2RAINBOW LINES IN SPACE! Create a new hitbox costume that is the right size for the crab. During the Quiz End of Quiz. Click the green flag to test the code so far. Click the green flag to test the code so far. You’ll use an iterative process: first, you’ll make the basic game, and then you’ll make small improvements to it. Retail: $24.95. The entire Platformer game setup is complete! REVIEW QUESTIONS . Now all we have to do is make a game using all the pieces we have. The backdrop will be the image that is displayed on the Stage. When a sprite moves after running the "pen down" block, it draws a line behind it as it moves. Add the following code to the Crab sprite. Drag a Select rectangle over the part of the costume you want to delete. This code is exactly like the code in the Maze Runner game in Chapter 3 that blocks the player from walking through walls. Go to https://www.nostarch.com/scratchplayground/ and download the ZIP file to your computer by right-clicking the link and selecting Save link as or Save target as. We just need to add some animation code that switches between these costumes at the right time. The Crab sprites subtract 1 from Apples Collected and say “Got one!” when they touch the player. Get this Book. 3. Quickly pressing the key should cause a small jump. But there are plenty of Scratch programming techniques to practice first. Make sure you check the Run without screen refresh checkbox! You can always look through other Scratcher’s programs to get more ideas. This meant that the player jumped the height of that variable’s value each time. You combined and used lots of different concepts to make this game, so it might help to read through this chapter a few more times. Name this costume hitbox. But note that there are two conditions for the cat to continue moving up—the player must hold down W and the in air variable must be less than 8. Let’s break it down to better understand each part. Read Chapter 7, Fruit Slicer (PDF) Download the book's resources; Answers to the book's Review Questions “An impressive manual for achieving Scratch programming mastery and creating genuinely entertaining games.” —Kirkus Reviews After an introduction explaining the book’s structure and a first chapter that gets users up and running in Scratch… Let’s call it walk and give this new custom block an input called steps. The Stage backdrop is used to set the appearance of the platforms and background. The costume number is based on the costume’s order in the Costumes tab. At first, the movement variable is set to a random number between 1 and 6 that decides which movement the crab will make. The Crab sprite will still have all the Cat sprite costumes (Stand, Fall, Walk1, and so on). So, right-click on the Scripts Area, and select clean up to reorganize the scripts into neat rows. The new walking animation makes the Platformer game look more appealing. In Chapter 5, you’ll make a side-view game that uses cloning to duplicate a sprite dozens of times. The rest of the Crab sprite’s code defines these movements. This platform should be low enough that the cat could hit its head on it. In this chapter, you’ll learn a few tricks to make the game more colorful and interesting by adding animations and effects. Use the Eraser tool to erase areas that aren’t rectangular. This isn’t very realistic. 2. Scratch, the colorful drag-and-drop programming language, is used by millions of first-time learners, and in Scratch Programming Playground, you’ll learn to program by making cool games.Get ready to destroy asteroids, shoot hoops, and slice and dice fruit! ISBN-13:9 78-1-84078-612-5 9 78184 07 8612 5 5 1 4 9 9 It’s fully illustrated We don’t just tell you how to do it, we also show you how. There’s another problem with the game. Scratch Programming Playground,2E (Scratch 3) # 042751. As the player moves the Cat sprite left or right, we want the frame variable to increase. Both of these will turn off line drawing. Make sure you can move the cat all around the Stage. In the platform game, the AI for the crabs is actually pretty unintelligent: the crabs will just move around randomly. Click the red stop sign and save your program. in Space! Click the green flag to test the code so far. Click the Make a Block button in the dark purple More Blocks category to make the walk block. This is the bug we need to fix. In this figure, the cat isn’t falling because its cheek has “landed” on the platform, which isn’t very realistic. Now that we have a sprite for the ground, we need the cat to fall and land on it. Make sure the two crabs are jumping around. The larger the in air value is, the longer the cat will have been off the ground and in the air. (If you ran the program right now, the keyboard keys would control the Cat and Crab sprites, because they have the same code!). Otherwise, we must calculate which of the eight walking costumes to show. Tweet. We use a Boolean input because we need to know if y velocity is greater than 0 when the handle ground block is first called. Sequential Easy First Hard First. If you programmed the Basketball game in Chapter 4, the falling code should be familiar. If the Cat sprite is on the ground (or has just started jumping or falling so that in air is less than 3), then we want to display either the standing costume or one of the walking costumes. This tutorial will introduce you to programming using Scratch from MIT. Your Scratch programs might not look like “real” games you play on a PC, game console, or smartphone. . Click the red stop sign. When they touch the cat, they should steal an apple and say “Got one!” If the cat doesn’t have any apples, the crabs should just say “Apples!” Then click the red stop sign and save your program. So when frame is 0, the switch costume to Stand block displays the Stand costume. Also, if the cat is moving from the left side of the Stage, its y position will be less than 5. Click the green flag to test the code so far. Add this code to the Crab sprite. A project-filled introduction to coding that shows kids how to build programs by making cool games. Extract all the files from the ZIP file. The falling code at ➊ subtracts 2 from the y velocity variable and then moves the Cat sprite’s y position by y velocity, making the cat fall faster and faster. Make sure the cat can walk off the left edge of the Stage and wrap around to the right, and vice versa. Scratch: Chapter 3 Quiz Scratch: Chapter 3 Quiz . The filenames for these images are Walk1.svg, Walk2.svg, and so on up to Walk8.svg, as well as Stand.svg, Jump.svg, and Fall.svg. Then click the red stop sign and save your program. This makes the code in the forever loop in script ➊ change the Cat sprite’s y position by the positive y velocity, moving it upward. The dark purple custom blocks can help us do this. (Use your real birth month and year. Modify the Cat sprite’s existing when green flag clicked script to add a third if then block that resets the frame variable. Add the following script to the Cat sprite. The movement variable will store a number representing the Crab sprite’s movements: The Crab sprite’s movements will be randomly decided and will frequently change. By doing so, the hitbox will determine whether the cat is touching the ground. At the start of the jump, the in air variable is increasing but is still less than 8. In this chapter, you’ll create a cool-looking animation: a rainbow V that flies through space and leaves colorful trails behind.

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