# Rotating a crank
**URL:** https://forum.kirupa.com/t/rotating-a-crank/104217
**Category:** Uncategorized
**Created:** [March 13, 2004, 6:53pm UTC](https://forum.kirupa.com/t/rotating-a-crank/104217 "2004-03-13T18:53:55Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@hondo311](https://forum.kirupa.com/u/hondo311)
#### Post date: [March 13, 2004, 6:53pm UTC](https://forum.kirupa.com/t/rotating-a-crank/104217/1 "2004-03-13T18:53:55Z")
I have this nifty crank . . . see cheesy image.
1. I want to animate this crank so that a user can “grab” the handle w/ the cursor and rotate it lke a real crank around a central axis.
2. it’ll be used as a navigation tool (forward/back) to scroll images.
3. added bonus: the faster the crank is spun, the faster the images scroll?
thanks so much for your help!
hondo311
---
### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [April 6, 2004, 5:35pm UTC](https://forum.kirupa.com/t/rotating-a-crank/104217/2 "2004-04-06T17:35:44Z")
ok, this is my second way of trying to scroll images:
rotating the crank scrolls the images based on angle of rotation.
the problem is that when i let go of the mouse, the crank stops and “sticks” and doesn’t work any more.
i want the images to change as the crank is cranked, and be able to keep cranking in both directions during and after.
## fla is attached. here is the code for the crank:
mc.btn.onPress = function(){
scrolling = true;
}
mc.btn.onmouseUp = function(){
scrolling = false;
}
onEnterFrame = function(){
if(scrolling){
var dx=mc.\_x-\_xmouse;
var dy=mc.\_y-\_ymouse;
var rad = Math.atan2(-dy,-dx);
var angle = (rad\*180)/Math.PI;
mc.\_rotation=angle;
if (angle\>85 && angle\<=90) {
trace("angle = "+angle);
\_root.changePhoto(1);
} else if (angle\>175 && angle\<=180) {
trace("angle = "+angle);
\_root.changePhoto(-1);
}
}
}
* * *
images are also attached to test if it works. put them in a folder named “animation” in the same directory as the fla file.