Animation Basics

In Scratch, costumes are different appearances that a sprite can have. Think of them like outfits or poses for your character. By switching between costumes quickly, we can create the illusion of movement - this is the basis of animation in Scratch!

Exploring Costumes

Let's explore costumes:

Now that you've seen how costumes work, think about how we might use them to create animations. In the next section, we'll learn how to switch between costumes programmatically!

Now that we understand what costumes are, let's learn how to switch between them using Scratch blocks. This is the first step in creating our own animations!

The "Switch Costume" Block

The main block we'll use for changing costumes is the "switch costume to [ ]" block. It looks like this:

The "switch costume to" block in Scratch

Let's Try It Out

Follow these steps to switch costumes:

Great job! You've just created your first costume change. In the next section, we'll learn how to time these changes to create smooth animations.

Now that we can switch costumes, let's learn how to create smooth animations by controlling the timing of these switches.

The "Wait" Block

To control the timing of our animations, we'll use the "wait" block. It looks like this:

The "wait" block in Scratch

This block pauses the script for a specified number of seconds before moving to the next block.

Creating a Simple Animation

Let's create a simple animation:

Congratulations! You've created your first animation. Experiment with different wait times to see how it affects the speed of your animation. In the next section, we'll learn how to make our animations repeat continuously.

Now that we've mastered the basics of animation in Scratch, let's explore some more advanced techniques to create smoother and more complex animations.

Using Loops for Continuous Animation

To make our animations repeat continuously, we can use loop blocks. The two main loop blocks we'll use are:

• Repeat [ ] : This block repeats the enclosed blocks a specified number of times.
• Forever : This block repeats the enclosed blocks indefinitely, until the script is stopped.

The repeat and forever blocks

Creating a Looping Animation

Let's modify our previous animation to loop:

Advanced Tip: Using "Next Costume"

Instead of manually switching to each costume, you can use the "next costume" block to automatically cycle through all available costumes. This is especially useful when you have many costumes!

The "next costume" block in Scratch

Now that you've learned these advanced techniques, try creating more complex animations with multiple costumes and different timing patterns. In the next section, we'll put everything together in a mini-project!

Let's put everything we've learned together to create an animated story scene in Scratch!

Project Description

Create a short animated scene with at least two sprites. One sprite should have a looping animation, while the other should change costumes in response to user input (like a mouse click).

Step-by-Step Guide

Example Code Structure

Here's a basic structure for your project:

// For the continuously animating sprite (e.g., tree)
when green flag clicked
forever
    switch costume to [costume1]
    wait (0.5) seconds
    switch costume to [costume2]
    wait (0.5) seconds

// For the interactive sprite (e.g., character)
when this sprite clicked
switch costume to [next costume]
say [Hello!] for (2) seconds
                

Challenge

Can you add a third sprite with a different animation pattern? Maybe a cloud that moves across the screen, or a sun that rises and sets?

Remember, creativity is key! Feel free to modify this project idea to create your own unique animated scene. Don't forget to share your project with your classmates when you're done!