// If there is a marker under the cursor, and lastSelected is null
 // set the lastSelected to be the first marker found under the cursor
 // Make sure you do not select two markers.
 //
 private void selectMarkerIfHover(List<Marker> markers) {
   // Select the marker and call it's setSelected() method with first argument as true
   for (Marker marker : markers) {
     if (marker.isInside(map, mouseX, mouseY)) {
       lastSelected = (CommonMarker) marker;
       lastSelected.setSelected(true);
       break;
     }
   }
 }
 /** Event handler that gets called automatically when the mouse moves. */
 @Override
 public void mouseMoved() {
   // clear the last selection
   if (lastSelected != null) {
     lastSelected.setSelected(false);
     lastSelected = null;
   }
   selectMarkerIfHover(quakeMarkers);
   selectMarkerIfHover(cityMarkers);
 }
  // If there is a marker under the cursor, and lastSelected is null
  // set the lastSelected to be the first marker found under the cursor
  // Make sure you do not select two markers.
  //
  private void selectMarkerIfHover(List<Marker> markers) {
    // TODO: Implement this method
    if (lastSelected != null) return;

    for (Marker marker : markers) {
      if (marker.isInside(map, mouseX, mouseY)) {
        lastSelected = (CommonMarker) marker;
        lastSelected.setSelected(true);
        return;
      }
    }
  }
 /**
  * The event handler for mouse clicks It will display an earthquake and its threat circle of
  * cities Or if a city is clicked, it will display all the earthquakes where the city is in the
  * threat circle
  */
 @Override
 public void mouseClicked() {
   // TODO: Implement this method
   // Hint: You probably want a helper method or two to keep this code
   // from getting too long/disorganized
   if (lastClicked != null) {
     unhideMarkers();
     lastClicked.setSelected(false);
     lastClicked = null;
   } else {
     selectMarkerIfClicked(quakeMarkers);
     selectMarkerIfClicked(cityMarkers);
     if (lastClicked != null) {
       showSelectMarkers();
     }
   }
 }