[F8] Inaccuracy when aiming (help please!)

I am trying to make some mc's follow another one which is static. I've always got this fine but for some reason the mcs don't follow a straight line or do not aim at the mc correctly :s . I really don't get what's going on and in the game I'm working on it is needed that they follow a straight line.

Here's an example for you to see:
http://www.giddelcreations.com/other...y_test_f8.html

The blue ones follow the mc by determining the distance in _x and _y in every frame, like this:

Code:

---

xq = 0.004*(_root.dude._x - _x);
yq = 0.004*(_root.dude._y - _y);
_x += xq;
_y += yq;

---

The red ones do something like that but instead of determining the distance on every frame they do it only once and the move at the same speed. These are the less accurate.

The gray ones determine the angle of the mc in every frame and then follow it. Code goes like this:

Code:

---

var c:Number = 0;
var xs:Number;
var ys:Number;
var mul:Number = Math.PI / 180;
onEnterFrame = function () {
        xq = _root.dude._x - _x;
        yq = _root.dude._y - _y;
        rot = Math.atan2(yq, xq) * 180/Math.PI;
        xs = Math.cos(rot * mul) * 0.7;
        ys = Math.sin(rot * mul) * 0.7;
        _x += xs;
        _y += ys; (...)

---

Thanks so much for any help! :)

You can download the source here: http://www.giddelcreations.com/other...ay_test_f8.fla

Coordinates of movie clip are not full Numbers, they are cut off after comma. Using coordinates over and over makes your calculations inaccurate. Try this way (for grey circle):

Code:

---

var myx:Number = _x;
var myy:Number = _y;
...
onEnterFrame = function () {
        xq = (_root.dude._x - _x);
        yq = (_root.dude._y - _y);
        rot = Math.atan2(yq, xq) * 180/Math.PI;
        xs = Math.cos(rot * mul) * 0.7;
        ys = Math.sin(rot * mul) * 0.7;
       
        myx += xs;
        myy += ys;
        _x = myx;
        _y = myy;
        ...

---

Thanks bunches Tonypa!!! that woked quite perfect. Greatly appreciated! It's good to learn new things everyday :)