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2. Make Cassy Dance in One Spot

Transcript

In this video, you'll make the sprite dance in one spot on the screen.

Watch first, as the video shows you the steps that you'll need to take.

Then comes the fun part, where you get to try it for yourself.

Some sprites in Scratch like Cassie, have multiple costumes, so just the one shown here on the costumes tag.

A costume's one of the many possible appearances of a sprite.

If you click on each of the sprite's costumes, her appearance changes so that it looks like she is dancing.

You can also change the sprite's costumes with code, choosing the looks menu.

There, you will find many blocks that affect the sprite's appearance, click any button to see what it does or you can drag a block into the script editor to include it in your project.

If you drag the next costume block into the script editor, and click the code block, the sprite costume changes, and she dances.

What, you want the sprite to keep dancing, and your hand will get pretty tired, if you keep having to click the next costume block.

This is a great time to use the Forever block.

Click on the control menu and choose the forever block.

Drag the forever block into the Script Editor and place it around the next costume block.

Now, click the blocks that can test your code, and see what happens.

Cassie dances really fast, and she keeps on dancing.

Computers are great at following instructions, quickly, and repeating them forever.

One of the best reasons to know a little Computer Science is that you can use it to make repeated tasks happen automatically.

This is certainly a lot easier than clicking the next costume over and over again.

To change how fast the sprite dances, use a wait block, which you will find also under the Control menu.

Place the wait block inside the forever loop to create a pause before the next costume change.

If the sprite is moving too slowly, tinker with the value in the wait block to change the speed of the costume change until you find one that works.

For example, adding a wait one-second block into the forever loop makes the sprite wait one second between costume changes.

If that seems a little slow, try changing the wait block or wait value, to .1.

Too fast, maybe .2.

All right, that's better.

When you do this on your own, try a few different values in the wait block, and pick the one you like best.

If you get stuck, ask your neighbor or teacher to help you find a solution.

Now it's your turn.

Use the next costume block in a wait block with any value inside of it that you like the most.

Remember to put a forever block around those blocks, so that they run over and over again, forever, when you click on them.

When you finish this step, return to this CS First page and click the green arrow to move on to the next video.

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Instructions
  1. Make Cassy look like she is dancing.
  2. Make Cassy keep dancing forever.
  3. Control the speed of Cassy's dance.