# Stuck trying to get certain animation effect

**URL:** <https://forum.kirupa.com/t/stuck-trying-to-get-certain-animation-effect/323292>\
**Category:** flash\
**Created:** [June 23, 2011, 10:14pm UTC](https://forum.kirupa.com/t/stuck-trying-to-get-certain-animation-effect/323292 "2011-06-23T22:14:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![gloopy](https://avatars.discourse-cdn.com/v4/letter/g/82dd89/32.png) [@gloopy](https://forum.kirupa.com/u/gloopy)\
**Post date:** [June 23, 2011, 10:14pm UTC](https://forum.kirupa.com/t/stuck-trying-to-get-certain-animation-effect/323292/1 "2011-06-23T22:14:21Z")

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I saw this today:

[http://s0.2mdn.net/1062493/Wellingtoneuromillions728x90.swf](http://s0.2mdn.net/1062493/Wellingtoneuromillions728x90.swf)

I wonder if anyone might be able to advise please on how to animate the effect where the background changes from blue stars to yellow stars?

I can see it’s done using masks, but I’m stuck trying to animate the 360 degree effect which I suppose would be like an animation of a circle getting thinner and thinner, radiating out from the centre.

I can’t explain it too well, but the effect is there in the swf link above. I’ve also attached an image showing what I mean - the animation would I guess start with a full circle, and then smoothly go to eventually nothing, but starting from the middle!

Ack! I hope the swf link and attachment explain what I mean anyway.

Any advice much appreciated.

Thanks!