import java.awt.*;
import java.applet.*;

public class Co extends Applet
{
	static double PI = 3.1415;
	static int STPY = 50;
	
	int ddep, dlen;
	boolean drun = false;
	TextField TFlen;
	
	public void init()
	{
		Button Btn0, Btn1, Btn2, Btn3, Btn4, Btn5, Btn6, Btn7;
		Label Llen, Ldep;
		Panel Pnl;
		
		Btn0 = new Button("0");
		Btn1 = new Button("1");
		Btn2 = new Button("2");
		Btn3 = new Button("3");
		Btn4 = new Button("4");
		Btn5 = new Button("5");
		Btn6 = new Button("6");
		Btn7 = new Button("7");
		Pnl = new Panel();
		Llen = new Label("Line length:");
		Ldep = new Label("Draw Depth:");
		TFlen = new TextField("300");
		
		Pnl.add(Llen);
		Pnl.add(TFlen);
		Pnl.add(Ldep);
		Pnl.add(Btn0);
		Pnl.add(Btn1);
		Pnl.add(Btn2);
		Pnl.add(Btn3);
		Pnl.add(Btn4);
		Pnl.add(Btn5);
		Pnl.add(Btn6);
		Pnl.add(Btn7);
		add(Pnl);
	}
	
	public boolean action(Event e, Object obj)
	{
		if (e.target instanceof Button)
		{
			drun = true;
			ddep = Integer.parseInt(obj.toString());
			dlen = Integer.parseInt(TFlen.getText());
			repaint();
		}
		return true;
	}
	
	public void paint (Graphics g)
	{
		if(drun)
		{
			double l, h, t;
			
			drun = false;
			l = dlen;
			h = l*Math.sin(PI*1/3);
			t = h*1/3 + STPY;
			drawTogeline(g, ddep, 0,   t,   l,   t);
			drawTogeline(g, ddep, l,   t,   l/2, t+h);
			drawTogeline(g, ddep, l/2, t+h, 0,   t);
		}
	}
	
	public void drawTogeline(Graphics g, int lev, double sx, double sy, double ex, double ey)
	{
		if(lev != 0)
		{
 			double ftlx, ftly, ftrx, ftry, topx, topy;
 			
 			ftlx = sx+(ex-sx)*1/3;
			ftly = sy+(ey-sy)*1/3;
			ftrx = sx+(ex-sx)*2/3;
			ftry = sy+(ey-sy)*2/3;
			topx = ftlx+(ftrx-ftlx)*Math.cos(PI*1/3)+(ftry-ftly)*Math.sin(PI*1/3);
			topy = ftly+(ftry-ftly)*Math.cos(PI*1/3)-(ftrx-ftlx)*Math.sin(PI*1/3);
			drawTogeline(g, lev-1, sx,   sy,   ftlx, ftly);
			drawTogeline(g, lev-1, ftlx, ftly, topx, topy);
			drawTogeline(g, lev-1, topx, topy, ftrx, ftry);
			drawTogeline(g, lev-1, ftrx, ftry, ex,   ey  );
		}
		else
		{
			g.drawLine((int)sx, (int)sy, (int)ex, (int)ey);
		}
	}
}