Here, your get variables are typed as a String.

public function get children():String { return CHILDREN; }
public function get maxlevel():String { return MAXLEVEL; }

It should be a Number :
public function get children():Number { return CHILDREN; }
public function get maxlevel():Number { return MAXLEVEL; }

I don’t understand how you made it work without correcting this thing.

Very nice tuto. THANKS

I have a sprite class that draws itself then spawns a rotated copy of itself (only one copy). I want each child item to draw a line connecting to a fixed point on the boundary of the parent.

I’ve played around with passing points and using localToGobal to get the reference back I need, but no luck. Maybe I bit off too much as a first AS3 project

// the seed sprite to our fractal
private var _trunk:Sprite;

// the seed sprite to our fractal
private var _trunk:Branch;

Call to a possible undefined method update through a reference with static type flash.display:Sprite

Source : _trunk.update();

Works fine till the movement part code is exactly the same as yours, would like to get this going so I can experiment with it ? Help !