# Code Problem

**URL:** <https://forum.kirupa.com/t/code-problem/177341>\
**Category:** flash\
**Created:** [February 1, 2006, 4:14am UTC](https://forum.kirupa.com/t/code-problem/177341 "2006-02-01T04:14:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![The\_Stranger](https://avatars.discourse-cdn.com/v4/letter/t/a5b964/32.png) [@The\_Stranger](https://forum.kirupa.com/u/The_Stranger)\
**Post date:** [February 1, 2006, 4:14am UTC](https://forum.kirupa.com/t/code-problem/177341/1 "2006-02-01T04:14:59Z")

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Please I need someone who knows Actions Script to explain me this problem. The code its taken from a tutorial of this page ([http://www.kirupa.com/developer/mx/circular.htm](http://www.kirupa.com/developer/mx/circular.htm)):

* * *

onClipEvent (load) {  
var radius = 10 + Math.random() \* 50;  
var speed = 5 + Math.random() \* 20;  
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;  
}

* * *

I know this should be very basic and easy code for most of you, but I’m just learning AS. Well here is the doubre:

In the firs part of que code (the “onClipEvent (load)” part) I wrote some variables, these are not doing anything but getting some random numbers, the x and y values and giving “0” to “degrees” var. (About the “radian” variable I think it’s 0 too, becuase it doesn’t have and “=” simbol).

Well, the doubts came in the second part. Firstable Im saying:  
“degree += speed” I understan this should read like:  
“degree = degree + speed” In this particular case it should be:  
“degree = 0 + random number” In the end this line should drop a number like: 55.2845 or wathever… So why in the second line:  
[FONT=Courier New][/FONT]  
[FONT=Courier New]“radian = (degree/180)_[SIZE=2][COLOR=#000080]Math.PI[/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=black];" [/COLOR][/SIZE][/FONT]  
[FONT=Courier New][SIZE=2][COLOR=black][/COLOR][/SIZE][/FONT]  
[FONT=Courier New][SIZE=2][COLOR=black]If I repleace the “degree” var for a number:[/COLOR][/SIZE][/FONT]  
[FONT=Courier New][SIZE=2][COLOR=black][/COLOR][/SIZE][/FONT]  
[FONT=Courier New][SIZE=2][COLOR=black]"radian = ([FONT=Verdana]55.2845[/FONT]/180)_[FONT=Courier New][SIZE=2][COLOR=#000080]Math.PI[/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=black];”[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT]  
[FONT=Courier New][SIZE=2][COLOR=black][FONT=Courier New][SIZE=2][COLOR=black][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT]  
[FONT=Courier New][SIZE=2][COLOR=black][FONT=Courier New][SIZE=2][COLOR=black]All the code become usless, (the final circular movement wich its the objetive of the tutorial dosent work) ???

And well, in the line:  
“this.\_x = xcenter+Math.cos(radian)\*radius;”

Why I have to multiply “Math.cos” with “Radian”?.. Why if I use a simple number instead of the radian var it doesn’t work?

I prove this code without the “Math.PI” function and without multiplying the “radius” in the last two lines and it works perfectly.

I hope somebody can help me with this, Im just traying to understand the code, but I always finish with headaches.

Beforehand Thank You![/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT]