We will paint a new sprite – some ground and a mountain - PowerPoint PPT Presentation

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How to create motion tweening in Scratch using lists ( tweening is when you specify where the movement will start and end and the computer fills in intermediate frames. We will put a few x and y coordinates into the new feature in Scratch 1.4 called “lists” to make the cat jump over a mountain.

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We will paint a new sprite – some ground and a mountain

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Presentation Transcript

How to create motion tweening in Scratch using lists (tweening is when you specify where the movement will start and end and the computer fills in intermediate frames

We will put a few x and y coordinates into the new feature in Scratch 1.4 called “lists” to make the cat jump over a mountain

Zoom out in the paint editor because we are making a really big sprite

We need the cat to go over the mountain. That means the cat will glide through 5 points. We will enter the x and y positions of the points into a list

Manually move the cat through the paces, noting its X and Y

Type the current X value into the list, click + to add more points

Now, you will see a complex script that will step through both lists, gliding the cat between the coordinates

That’s it!

The next slide will show you another useful feature for animation – fade outs from black, just like in the Movie Maker...

Now, you can turn off

The lists on the screen by clearing the checkmarks for the lists...

The script for the black block:

Notice, that 5%x20%=100%

Could you also create a fade out to black?

Now, another useful trick – zoom in, just like in a video camera. We will zoom in all objects at once by using a variable and setting all sizes to that variable.

Create a variable called “allSize”

The code blocks for the black box (could be for any sprite, it doesn’t matter)

EXTENSION ACTIVITY:

How would you create a zoom out?

Add a random sprite to see how many objects can grow at once. Here is the code for this sprite.

Remember, you can drag these two blocks to other sprites to save you some time!

Double-click on stage – we’ll need to clear the extra images once the jump is over...

From the “Pen” palette, as well

Talking head – create a sprite Mouth and give it a few costumes for producing various sounds like “o”, “oo”, EE”, etc. Consult your language teacher for the shape of the mouth and its relation to the letter pronounced

The End

• Good luck in the competition!

• Scratch 1.4 files used in the creation of this tutorial. Save them and open in Scratch or BYOB.