I'm stuck thinking about the best way to go about setting a line segment's position, I have a class Line(length, angle, previous) being called from a class Polygon.. Right now I have:

public function Line(length:Number, angle:Number, previous:Line = null) {
    if (previous != null) {
        this.x = previous.end.x;
        this.y = previous.end.y;
    }
    /**/
}

Now, is this the best practice or should I be doing:

Polygon.addLine(length:Number, angle:Number):void {
    var previous = _line[_line.length - 1]; // Array containing all Lines
    var line:Line = new Line(length, angle, previous);
    line.x = previous.end.x;
    line.y = previous.end.y;
    /**/
}