Recursive Tree

var branches:int = 0;
var maxBranches:int = 400;
 
graphics.lineStyle(0,0x000000);

makeBranch(300,350,100,-45,45);
	 
function makeBranch(xp:Number, yp:Number, leng:Number, min:Number, max:Number):void {

	var endX:Number, endY:Number;
	var theta:Number = (min + Math.random()*(max-min) - 90) * Math.PI / 180;
	 
	endX = xp + leng * Math.cos(theta);
	endY = yp + leng * Math.sin(theta);

	graphics.moveTo(xp, yp);
	graphics.lineTo(endX, endY);
	
	if (branches < maxBranches) {
		var newLength:Number = leng*.7; 
		setTimeout(makeBranch, 0, endX, endY, newLength, -90, 0);
		setTimeout(makeBranch, 0, endX, endY, newLength, 0, 90);
	}
	branches+=2;
}

Draws a tree using recursion.