How to create motion
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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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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


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


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


It will look about that...


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


Under Variables blocks, create a new list and name it X coordinates


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


As you can see, the list fills up


Now, create a list Y coordinates


Similarly, add the Y points for the same points


The 2 lists (also known as “arrays”) contain 5 elements. We need to keep track of these with a variable HowManyTimes


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...


Add a new sprite and make it big and black (zoom out and use the paint bucket)


That’s what it looks like...


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!


“Matrix” somersault (stamp comes from the Pen pallete of blocks)


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


Mouth costumes being duplicated


We only made three


We’ll put the Mouth on top of a sprite’s face


Like this...


The code for the mouth


The End

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


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