# Orbital Radius

**URL:** <https://forum.kirupa.com/t/orbital-radius/242471>\
**Category:** flash\
**Created:** [October 26, 2007, 10:27am UTC](https://forum.kirupa.com/t/orbital-radius/242471 "2007-10-26T10:27:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![robdarkplace](https://avatars.discourse-cdn.com/v4/letter/r/7c8e57/32.png) [@robdarkplace](https://forum.kirupa.com/u/robdarkplace)\
**Post date:** [October 26, 2007, 10:27am UTC](https://forum.kirupa.com/t/orbital-radius/242471/1 "2007-10-26T10:27:33Z")

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If i am using actionscript to code (Flash MX 2004) for a circular motion path, and i want to change the radius over a set period of time, how would i do this?

I am using this code from a Kirupa circular movement tutorial:

onClipEvent (load) {  
var radius = 100  
var speed = 5

var xcenter = this.\_x;

var ycenter = this.\_y;

var degree = 0;  
var radian;  
}  
onClipEvent (enterFrame) {  
degree += speed;  
radian = (degree/180)\*Math.PI;  
this.\_x = xcenter+Math.cos(radian)\*radius;  
this.\_y = ycenter-Math.sin(radian)\*radius;  
}

Any help would be appreciated 🙂  
Rob