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# YUI Library Examples: Animation Utility: Animating Motion

# Animation Utility: Animating Motion

This demonstrates how to use the YUI Animation to animate the motion of an HTMLElement. Click the button to begin the demo.

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## Animating Motion

The YUI Animation Utility allows you to animate the motion of an HTMLElement.

For this example, we will animate the position of a `<div>` element named `demo`. Note that you could accomplish this with a positioned element by animating offset properties ("top", "left", etc.), but those values are not necessarily in page coordinates. The `points` attribute, introduced in the `YAHOO.util.Motion` subclass, ensures that position is always relative to the document (unless using `by` rather than `to`, which is relative to the current position).

Add a little style so that we can see the animation in action:

<style type="text/css"> #demo { background:#ccc; height:30px; width:30px; } </style>

Create the `demo` element and a button to run the animation:

<div id="demo">Demo</div> <button id="demo-run">run</button>

Now we create an instance of `YAHOO.util.Motion`, passing it the element we wish to animate, and the points attribute (an array of [x, y] positions), with the point we are animating to:

<script type="text/javascript"> var attributes = { points: { to: [600, 10] } }; var anim = new YAHOO.util.Motion('demo', attributes); </script>

The final step is to call the `animate` method on our instance to start the animation. The button will be the trigger that begins the animation sequence:

<script type="text/javascript"> YAHOO.util.Event.on('demo-run', 'click', function() { anim.animate(); }); </script>

This is an example of animating the motion HTMLElement.

### Animation Utility Examples:

- Basic Animation
- Animation Easing
- Animating From a Given Value
- Using Custom Units for an Animation
- Animating Multiple Attributes
- Animating Colors
- Animating Motion
- Animating Along a Curved Path
- Animated Scrolling
- Glowing Button (included with examples for Button Control)

### More Animation Utility Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

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