import java.awt.image.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class Pildiloomine3 extends Applet implements MouseListener{
   int hx=100, hy=100;
   public Pildiloomine3(){
     addMouseListener(this);
   }
   public Image looLainetus(int laius, int korgus, int kx, int ky,
                                  double lainepikkus){
        int punktid[] = new int[laius*korgus];
        int nr=0;
        for (int y = 0; y < korgus; y++){
            for (int x = 0; x < laius; x++) {
                int punane=125+(int)(125*Math.sin(kaugus(x, y, kx, ky)*2*Math.PI/lainepikkus));
//                int punane=Math.max(255-(int)(255*Math.sqrt((x-hx)*(x-hx)+(y-hy)*(y-hy))/(laius)), 0);
                int sinine =  200;
                punktid[nr++] = (255<<24)|(punane << 16) | sinine;
            }
        }
        return createImage(new MemoryImageSource(laius, korgus, punktid, 0, laius));
   }
   
   static double kaugus(double x1, double y1, double x2, double y2){
     double vahex=x2-x1;
     double vahey=y2-y1;
     return Math.sqrt(vahex*vahex+vahey*vahey);     
   }
   
   public void paint(Graphics g){
        Image pilt=looLainetus(getSize().width, getSize().height, hx, hy, 20);
        g.drawImage(pilt, 0, 0, null);
   }
   
   public void update(Graphics g){
     paint(g);
   }

   public void mousePressed(MouseEvent e){
     hx=e.getX();
     hy=e.getY();
     repaint();
   }
   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 Pildiloomine3());
    f.setSize(200, 220);
    f.setVisible(true);
  }
}