import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class Joon extends Applet implements KeyListener{

  int laius=300;
  int korgus=300;

  int pikkus = 20;
  int samm = 4;

  double x = laius/2;
  double y = korgus/2;

  double nurk=0;


  public Joon(){
    addKeyListener(this);
  }

  public void paint(Graphics g){

    double x2=x+pikkus*Math.cos(nurk);
    double y2=y+pikkus*Math.sin(nurk);


    g.setColor(Color.white);
    g.fillRect(0, 0, laius, korgus);

    g.setColor(Color.black);
    g.drawLine((int)x, (int)y, (int)x2, (int)y2);
  }

  public void update(Graphics g){
    paint(g);
  }

  public void keyPressed(KeyEvent e){
    int key=e.getKeyCode();

    if (key == KeyEvent.VK_LEFT) nurk = nurk-0.1;
    if (key == KeyEvent.VK_RIGHT) nurk = nurk+0.1;

    if (key == KeyEvent.VK_UP ) {
      x = x+Math.cos(nurk)*samm;
      y = y+Math.sin(nurk)*samm;
    }

    if (key == KeyEvent.VK_DOWN ) {
      x = x-Math.cos(nurk)*samm;
      y = y-Math.sin(nurk)*samm;
    }
    repaint();
  }

  public void keyReleased(KeyEvent e){}
  public void keyTyped(KeyEvent e){}

  public static void main(String args[]){
    Frame f=new Frame();
    f.add(new Joon());
    f.setSize(310, 330);
    f.setVisible(true);
  }
}