WEBVTT

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Hour of Code | Dance Party: Properties

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My name is Maria.

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I'm a junior at the University of Washington

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and I'm an Amazon future engineer.

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I love computer science because

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it incorporates problem-solving and critical thinking.

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And after putting hours of work into something,

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you can get something really cool and rewarding out of it.

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So far, you've had a chance to play with some different types of dancers

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and you've programmed them to do different types of dance moves.

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But how do these moves really work?

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Every dance move is made up of a series of images called frames.

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Each frame is slightly different from the
one before it.

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When your program runs, the computer shows one frame after another.

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They're shown so fast that it looks like the
dancer is moving.

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This is the secret behind all animation.

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Not only can you change your dancer's moves,

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you can also change a dancer's properties.

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Properties describe things like the dancer's
position on the screen,

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the dancer's size,

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and the dancer's color.

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To change the properties of a dancer, you'll use a "set" block.

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Let's use a "set" block to make our dancers look smaller.

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First, drag the set block into your program.

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Then, select the dancer you'd like to change

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and type in the size that will appear on screen.

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Full size is 100.

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If you choose a lower number, that will make the dancer smaller.

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The smaller the dancer is, the further away it looks.

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This is a great way to make backup dancers.

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Using the set block, you can also change the dancer's dimensions,

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rotation,

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position

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and color.

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By playing around with these properties

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you can make all kinds of changes and link them to different parts of the song.

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Remember, you can only set the properties of a dancer that already exists.

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Make sure that your set block comes after the "Make a new dancer" block.

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Feel free to experiment, be creative,

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and have fun.