public CWlanLayer(CWlanInfo[] theWlanInfo) 
{
    
    wlanInfos = theWlanInfo;
    isToRender = new boolean[wlanInfos.length];
    for (int i = 0; i< wlanInfos.length; i++){
      isToRender[i] = true;
    }
    setBounds(0,0,800,600);
}

 public  void paintComponent(Graphics g1) 
{
    Graphics2D g = (Graphics2D)g1;
    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                       RenderingHints.VALUE_ANTIALIAS_ON);
    for(int i = 0; i <  isToRender.length; i++){ // for each WLAN
      if(isToRender[i] == true){ //if it is to render
        if(debug){
          System.out.println("Rendering " + wlanInfos[i].toString());
        }
        CWlanPosition[] positions = wlanInfos[i].getWlanPositions();
        int wlanColor = (int)(i*100/isToRender.length);
        g.setColor(Color.getHSBColor(100,100,wlanColor));
        //g.fillRect(i*10,0,10,10);
        for (int j = 0; j <  positions.length; j++){ // for each position of the WLAN
          g.setColor(Color.getHSBColor(100,(int)(positions[j].getQuality()), wlanColor));
          g.fill(new Ellipse2D.Double(positions[j].getLatitude(),
                                      600-positions[j].getLongitude(),
                                      30, 30));
        }
      }
    }
    if (debug){
      g.setColor(Color.gray);
      for (int i = 0; i< 600; i+=10){
        g.drawLine(0,i,800, i);
        if(i%100 == 0){
          g.drawLine(0,i-1,800, i-1);
          g.drawLine(0,i+1,800, i+1);
        }
      }
      for (int i = 0; i< 800; i+=10){
        g.drawLine(i,0,i,600);
        if(i%100 == 0){
          g.drawLine(i-1,0,i-1,600);
          g.drawLine(i+1,0,i+1,600);
        }
      }
    }
}

 public  void setIsToRender(int[] selectedWlans) 
{
    for (int i = 0; i< isToRender.length; i++){
      isToRender[i] = true;
    }
    for (int i = 0; i< selectedWlans.length; i++){
      isToRender[selectedWlans[i]] = false;
    }
    repaint();
}