import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.util.LinkedList;
public class KukkuvPall4 extends Applet 
         implements MouseListener, Runnable{
  int r=10;
  double koef=10; //10 punkti=1 meeter
  int maapind=200;
  LinkedList pallid=new LinkedList();
  Image taust=Toolkit.getDefaultToolkit().getImage("taust.gif");
  Image pall=Toolkit.getDefaultToolkit().getImage("lill1.gif");
  Image puhver;

  int ex(double ox){
    return (int)(ox*koef);
  }
  int ey(double oy){
    return (int)(maapind-oy*koef);
  }
  double ox(int ex){
    return ex/koef;
  }
  double oy(int ey){
    return (maapind-ey)/koef;
  }
  public KukkuvPall4(){
    addMouseListener(this);
    new Thread(this).start();
  }
  
  public void paint(Graphics g){
    if(puhver==null){
       puhver=createImage(getWidth(), getHeight());
    }
    Graphics piltg=puhver.getGraphics();
    piltg.drawImage(taust, 0, 0, this);
    for(int i=0; i<pallid.size(); i++){
      Pall p=(Pall)pallid.get(i);
      piltg.drawImage(pall, ex(p.kysiX())-r, ey(p.kysiY())-r,
                     2*r, 2*r, this);
      //if(p.kysiY()<2){pallid.remove(p);}
    }
    g.drawImage(puhver, 0, 0, this);
  }

  public void update(Graphics g){
    paint(g);
  }
  
  public void run(){
    while(3>2){
      repaint();
      try{Thread.sleep(100);}catch(Exception e){}
    }
  }
  
  public void mousePressed(MouseEvent e){
    maapind=getHeight();
    pallid.add(new Pall(ox(e.getX()), oy(e.getY())));
  }
  public void mouseReleased(MouseEvent e){}
  public void mouseClicked(MouseEvent e){}
  public void mouseEntered(MouseEvent e){}
  public void mouseExited(MouseEvent e){}

  public static void main(String[] argumendid){
    Frame f=new Frame();
    f.add(new KukkuvPall4());
    f.setSize(200, 200);
    f.setVisible(true);
  }
  class Pall{
    long algaeg=System.currentTimeMillis(); 
    double ax, ay;
    double tk; //kukkumisaeg
    final double g=9.8;
    public Pall(double ux, double uy){
      ax=ux; ay=uy;
      tk=Math.sqrt(ay*2/g);
    }
    double kysiX(){return ax;}
    double kysiY(){
      double t=(System.currentTimeMillis()-algaeg)/1000.0;
      int tehtudPorgeteArv=(int)(t/(2*tk));
      t=t-tehtudPorgeteArv*2*tk;
      if(t<=tk){
        return ay-9.8*t*t/2;      
      }
      return ay-9.8*(2*tk-t)*(2*tk-t)/2;
    }
  }
}