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what kind of random motion do you want? vibration? choosing a random destination and moving there?

you could make a movie that will gravitate towards a given coordinate, and then set new coordinates with Math.random(); whenever it gets there.

putting this in a movie will create random vibration:

 onClipEvent(load){        sx = guitar._x;        sy = guitar._y;}onClipEvent(enterFrame){        guitar._x = sx + Math.random()*6-3;        guitar._y = sy + Math.random()*6-3;}

what do you need?

Edited to update for mx



randomness is fun... ; )

put a few functions in _root, frame 1:

//// functions

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(){
var dist,norm;
this.x = this._x;
this.y = this._y;
this.speed = Math.random()*4+2;
this.targx = Math.random()*100;
this.targy = Math.random()*100;
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;
}

and then in each clip you want to behave like this:

onClipEvent(enterFrame){
move();
}

since reset and move have been defined as methods, you can't use them as variable names.

cheers.

kirupa, you have carte blanche to use anything i post as tips / tuts.

credit is always appreciated. i should credit the internet as a whole for my flash education.

a few notes i left off:

move and reset are not the only variables created in each movie by those functions, there's diffx/y, targx/y, t, and speed.

in the reset method, the 100's define the range of possible placement. perhaps that's obvious, but if you've put this in a larger movie and are wondering why everything happens in the top left corner, that'll be why.

cheers.

hey kirupa,

great tut. the variable "cycle" represents the number of milliseconds it will wait between movements. strictly speaking, it should probably be set in the if (!this.t) { block. right now it's being set every frame! for the speed, adjust how "speed" is set in the reset() function.

if a movie's registration point (the crosshairs) is in the center, there's no reason to subtract its _width/_height from the scope of the randomness. i have a habit of moving the registration point to the top left of all my movies. that way it works like the stage (0,0 represents the top left corner). that's why i did it. actually i had subtracted half the _widht/_height, effectively making it behave as if the registration point was in the centre (so why did i move it in the first place? oh well...).

i don't mean to nitpick, i'm just thrilled to see something i did up there.

thanks!