Computer Science Grade 7 20 min

Cloning Sprites

Cloning Sprites

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Introduction & Learning Objectives

Learning Objectives Explain the difference between an original sprite and a clone. Use code blocks to create a clone of a sprite. Write a separate script that controls the behavior of a clone. Use loops to generate multiple clones efficiently. Program a clone to delete itself after completing its task. Apply cloning to create game effects like projectiles or particle systems. Ever wanted to create an army of aliens, a shower of falling stars, or a hundred bouncing balls in your game with just a few blocks of code? 🚀 In this tutorial, you'll learn one of the most powerful techniques in programming: cloning. We'll explore how to create and control copies of a sprite, which lets you build complex and exciting projects without cluttering your workspace with dozens of...
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Key Concepts & Vocabulary

TermDefinitionExample SpriteAn object or character in a project that you can program to move, talk, and interact with other sprites.The main cat character in a new Scratch project is a sprite. CloningThe process of creating a temporary, exact copy of a sprite while the program is running. Clones share the original sprite's costumes and sounds but can have their own unique behaviors.Creating a clone of a 'raindrop' sprite every second to make it look like it's raining. Original SpriteThe one, permanent sprite that acts as a template for creating clones. It is often hidden and used only as a 'factory' for making copies.A single, hidden 'laser' sprite that creates a new clone every time the player presses the spacebar. CloneA temporary copy of a sprite...
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Core Syntax & Patterns

Creating a Clone Use the `create clone of [myself]` block. This block instantly makes a copy of the sprite that is running the code. You typically place this inside a loop or an event (like a mouse click) to generate clones when you need them. Programming the Clone Use the `when I start as a clone` hat block. This is the most important rule. The script attached to this block will ONLY be run by a new clone, not the original sprite. This is where you define the clone's unique behavior, like its movement and interactions. Deleting a Clone Use the `delete this clone` block. Clones exist forever unless you tell them to disappear. This block removes the clone that runs it. It's essential for preventing your project from slowing down due to too many clones on scr...

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Sample Practice Questions

Challenging
A student wants to create a trail of fading clones behind a moving character. The character's script has a `forever` loop with `create clone of [myself]` inside. The clone's script is `when I start as a clone -> wait 1 second -> delete this clone`. What will be the visual effect?
A.solid, non-moving line of clones will appear behind the character.
B.trail of clones will appear, and each clone in the trail will disappear after 1 second.
C.Only one clone will ever be visible at a time.
D.The character will appear to flicker rapidly as clones are created and deleted instantly.
Challenging
An original sprite is visible and has this script: `when green flag clicked -> forever -> create clone of [myself] -> wait 1 sec`. The clone script is: `when I start as a clone -> move 100 steps`. What will be the visual result?
A.stream of clones will appear and move away from the original sprite's position.
B.All clones will be stacked on top of each other 100 steps away from the original.
C.pile of clones will appear at the original's location, and another pile will appear 100 steps away.
D.The original sprite will create a clone, which moves, and then that clone will create another clone.
Challenging
To limit the total number of active clones to a maximum of 5, you use a variable called `clone_count`. Where should you increment (`change by 1`) and decrement (`change by -1`) this variable for the logic to work correctly?
A.Increment in the original's script right after creating a clone; decrement in the clone's script right before it is deleted.
B.Increment in the clone's script when it starts; decrement in the clone's script right before it is deleted.
C.Increment in the original's script before creating a clone; decrement in the original's script after a clone is deleted.
D.Increment and decrement both within the clone's script.

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