package ch.zhaw.ads;


public class HilbertServer implements CommandExecutor {
	Turtle turtle;
	
	private void hilbert(int depth, double dist, double angle) {
		if (depth >= 0) {
			turtle.turn(-angle);
			hilbert(depth-1, dist, -angle);
			turtle.move(dist);
			turtle.turn(angle);
			hilbert(depth-1, dist, angle);
			turtle.move(dist);
			hilbert(depth-1, dist, angle);
			turtle.turn(angle);
			turtle.move(dist);
			hilbert(depth-1, dist, -angle);
			turtle.turn(-angle);
		}
	}
	
	public String execute(String command) {
		int depth = Integer.parseInt(command);
		double dist = 0.8 / (Math.pow(2,depth+1)-1);
		turtle = new Turtle(0.1, 0.1);
		hilbert(depth, dist, -90);
		return turtle.getTrace();
	}

}