# Complex Bug, any help please?

**URL:** <https://forum.kirupa.com/t/complex-bug-any-help-please/178307>\
**Category:** flash\
**Created:** [February 9, 2006, 11:23am UTC](https://forum.kirupa.com/t/complex-bug-any-help-please/178307 "2006-02-09T11:23:03Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![zicemaster](https://avatars.discourse-cdn.com/v4/letter/z/b77776/32.png) [@zicemaster](https://forum.kirupa.com/u/zicemaster)\
**Post date:** [February 9, 2006, 11:23am UTC](https://forum.kirupa.com/t/complex-bug-any-help-please/178307/1 "2006-02-09T11:23:03Z")

</div>

This one is even weirder… Move the tank closer to the turrets with the arrow keys, and if your at certain distances… The turrets will flutter.

I did a trace, and I seem to be getting a few NAN’s… It only happens around a certain distance of two to three hundred pixels, and greater than like nine hundred._The nine hundred one I don’t care about, the AI won’t be active then._

Edit… I don’t even beleive it… Another bug! The turrets drift to the right for some reason when they are off screen… What the…

Should I encapsulate everything but the player in a seprate clip or what?  
[http://photobucket.com/albums/y232/minyMonkey/?action=view&current=tank.swf](http://photobucket.com/albums/y232/minyMonkey/?action=view&current=tank.swf)

I know how to fix the drift bug, put everything that moves inside the land MC. Maybe thats best…

```auto

dynamic class enemyTurret extends MovieClip {
    function onLoad() {
        this.life = 20;
        var bullet = 0;
        speed = 15;
        //Duplicate the bullet and fire
        MovieClip.prototype.fireEnemyCannon = function() {
            if (bullet>=200) {
                bullet = 0;
            }
            _root.enemyBullet.duplicateMovieClip("enemyBullet"+(bullet++), bullet+200, {_visible:true, _rotation:this.launch.r, _x:this.launch.x, _y:this.launch.y, gravity:.25, speed:15, friction:.99});
        };
    }
    function onEnterFrame() {
        //Match speed with land
        this._x += _root.landSpeed;
        //Make calculations for use in turret aim.
        angle = this.enemyBunkerTurret0._rotation;
        //Determin fire speeds... For the second time, same code also on bullet... Need to fix that...
        xSpeed = Math.abs(speed*Math.cos(angle*Math.PI/180));
        ySpeed = Math.abs(speed*Math.sin(angle*Math.PI/180));
        //Find distances between tank and turret
        dx = _root.tank0.tankTop0.launch.x-this.enemyBunkerTurret0.enemyLaunchPoint.launch.x;
        dy = _root.tank0.tankTop0.launch.y-this.enemyBunkerTurret0.enemyLaunchPoint.launch.y;
        radians = Math.atan(dy/dx);
        degrees = radians*180/Math.PI;
        degrees += 90;
        if (dx<0) {
            degrees -= 180;
        }
        //Set turret angle, .99is friection, .25 is gravity
        this.enemyBunkerTurret0._rotation = degrees+90-((((dx/xSpeed)*.99)+((dy/ySpeed)*.25))/2);
        //Die animation if life at zero or below.
        if (this.life<=0) {
            i++;
            play();
        }
    }
} 

```