/*		Koch-curve		  */
import java.applet.*;
import java.awt.*;

/* **************************************************************: */
public class Koch  extends java.applet.Applet{
	int n=5;

	public void init() {
		String data;

		setBackground(Color.lightGray);
        if( (data = getParameter("n")) != null) n = Integer.parseInt(data);
	}

/* **************************************************************: */
	public void paint(Graphics g) {
		 KochCurv koch = new KochCurv(); 

		g.setColor(Color.black);
		koch.setPoint(30.0, 140.); // 端点の座標指定
		koch.setangle(0.0);
		double leng = 400 * Math.pow(0.33333, n);
		koch.draw(n, leng, g);     // コッホ曲線描画
	}
}

/* ---------------- コッホ曲線のクラス ---------------- */
class KochCurv{
	double x0,y0, angle;

	KochCurv() {
	}
	public void draw(int i,double leng, Graphics gr)	{
		if ( i == 0) {
		  double rd = 3.1415927/180.;
		  double x =  leng * Math.cos(rd * angle) + x0 ;
		  double y = -leng * Math.sin(rd * angle) + y0;
		  gr.drawLine((int)x0,(int)y0,(int)x, (int)y);
		  x0 = x; y0 = y;
		}
		else {
			draw(i - 1, leng, gr); angle += 60.;
			draw(i - 1, leng, gr); angle -= 120.;
			draw(i - 1, leng, gr); angle += 60.;;
			draw(i - 1, leng, gr);
		}
	}
	public void setPoint(double lpx, double lpy) {
		x0= lpx ; 	y0 = lpy ;
	}
	public void setangle(double a) {
		angle = a;
	}
}