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

public class Tree extends Applet
{
	static double PI = Math.PI;
	
	TextField TFlen, TFdec, TFang, TFdep;
	int len, dep, dec, stx, sty;
	double ang;
	boolean drun = false;

	public void init()
	{
		Label Llen, Ldec, Lang, Ldep;
		Panel Pnl;
		
		Pnl = new Panel();
		
		Llen = new Label("Length:");
		Ldec = new Label("Declease:");
		Lang = new Label("Angle:");
		Ldep = new Label("Draw depth:");
		TFlen = new TextField("50");
		TFdec = new TextField("5");
		TFang = new TextField("30");
		TFdep = new TextField("10");
		
		Pnl.add(Llen);
		Pnl.add(TFlen);
		Pnl.add(Ldec);
		Pnl.add(TFdec);
		Pnl.add(Lang);
		Pnl.add(TFang);
		Pnl.add(Ldep);
		Pnl.add(TFdep);
		
		add(Pnl);
	}
	
	public boolean mouseDown(Event e, int x, int y)
	{
		len = Integer.parseInt(TFlen.getText());
		ang = PI*((double)Integer.parseInt(TFang.getText())/180);
		dep = Integer.parseInt(TFdep.getText());
		dec = Integer.parseInt(TFdec.getText());
		stx = x;
		sty = y;
		
		drun = true;
		repaint();
		
		return true;
	}
	
	public void paint(Graphics g)
	{
		if(drun)
		{
			drun = false;
			drawTree(stx, sty, stx, sty-len, 0, PI*1/2, g);
		}
	}
	
	public void drawTree(double sx, double sy, double ex, double ey, int cdep, double cang, Graphics g)
	{
		g.drawLine((int)sx, (int)sy, (int)ex, (int)ey);
		if(cdep<dep)
		{
			drawTree(ex, ey,
			 ex+(len-dec*cdep)*Math.cos(cang+ang),
			 ey-(len-dec*cdep)*Math.sin(cang+ang),
			 cdep+1, cang+ang, g);
			drawTree(ex, ey,
			 ex+(len-dec*cdep)*Math.cos(cang-ang),
			 ey-(len-dec*cdep)*Math.sin(cang-ang),
			 cdep+1, cang-ang, g);
		}
	}
}