Code snippet for my Unfolding tutorial site.

UsingUnfolding-GeoJSONApp-ext02_05.pde

ArrayList <ArrayList> makeAirportLists(
  UnfoldingMap map, 
  List<Marker> countryMarkers, 
  List<Marker> airportMarkers){

  ArrayList <ArrayList> lists = new ArrayList();

  // iterating through the countryMarkers
  for (Marker country : countryMarkers){
  
    // a new ArrayList for each country
    ArrayList currentMarkerList = new ArrayList();
  
    // iterating through the airportMarkers
    for (Marker airport : airportMarkers){
  
      // we need to get the Loction of the airport
      Location airportLocation = airport.getLocation();
  
      // we need do convert it into a ScreenPosition
      ScreenPosition airportScreenPos = map.getScreenPosition(airportLocation);
  
      // and if this ScreenPosition is inside the country
      if(country.isInside(map, airportScreenPos.x, airportScreenPos.y)){
  
        // we add the Marker to this ArrayList
        currentMarkerList.add(airport);
      }
    }
    // we add this ArrayList of Markers to our ArrayList of ArrayLists
    lists.add(currentMarkerList);
  
      // to see if the program is running we generate some output
      println(lists.size());
    }
  airportListsBuild = true;
  return lists;
}