# Random Motion Need Help!

**URL:** <https://forum.kirupa.com/t/random-motion-need-help/257435>\
**Category:** Uncategorized\
**Created:** [April 14, 2008, 10:45am UTC](https://forum.kirupa.com/t/random-motion-need-help/257435 "2008-04-14T10:45:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sledziu](https://avatars.discourse-cdn.com/v4/letter/s/d9b06d/32.png) [@sledziu](https://forum.kirupa.com/u/sledziu)\
**Post date:** [April 14, 2008, 10:45am UTC](https://forum.kirupa.com/t/random-motion-need-help/257435/1 "2008-04-14T10:45:01Z")

</div>

I’m beginer and I really need help with action script.

I have this script from tutorial:

function getdistance(x, y, x1, y1) {  
var run, rise;  
run = x1-x;  
rise = y1-y;  
return (\_root.hyp(run, rise));  
}  
function hyp(a, b) {  
return (Math.sqrt(a_a+b_b));  
}  
MovieClip.prototype.reset = function() {  
width = 550;  
height = 400;  
var dist, norm;  
this.x = this.\_x;  
this.y = this.\_y;  
this.speed = Math.random()\*4+2;  
this.targx = Math.random()\*width;  
this.targy = Math.random()\*height;  
dist = \_root.getdistance(this.x, this.y, this.targx, this.targy);  
norm = this.speed/dist;  
this.diffx = (this.targx-this.x)\*norm;  
this.diffy = (this.targy-this.y)\*norm;  
};  
MovieClip.prototype.move = function() {  
if (\_root.getdistance(this.x, this.y, this.targx, this.targy)\>this.speed) {  
this.x += this.diffx;  
this.y += this.diffy;  
}  
else {  
this.x = this.targx;  
this.y = this.targy;  
if (!this.t) {  
this.t = getTimer();  
}  
if (getTimer()-this.t\>1000) {  
this.reset();  
this.t = 0;  
}  
}  
this.\_x = this.x;  
this.\_y = this.y;  
};

I’ve tried to change it but it was too hard for me.

I need it to work like matrix motion. Move down and for example on y=400 disappear -\> appear on starting y position and start random motion down again.

Please help and sorry for my bad english.

If you need more precise information just tell me.