gistfile1.txt

function highlightCorrelations(currentMarker){
  // first make all the airports small
  $.each(airports, function(id, marker) {
    marker.setIcon(getIcon(2, 'black'));
  });
  // for each airport correlated to the selected airport, set it's icon to red 
  $.each(currentMarker.correlations, function(i, correlation) {
    var marker = airports[correlation[0]];
    marker.setIcon(getIcon(correlation[1], 'red')); //getIcon returns a circle symbol
  });
}


function getIcon(scale, color) {
  return {
    path: google.maps.SymbolPath.CIRCLE,
    fillColor: color || 'black',
    fillOpacity: .6,
    strokeColor: 'white',
    strokeWeight: .5,
    scale: scale * Math.pow(1.4, map.getZoom()) // Bigger circles as you zoom in
  };
}