drupal_routes/sites/all/modules/custom/custom_maps/custom_maps.module

<?php
/**
* http://drupal.stackexchange.com/questions/121225/display-driving-distance-between-coordinates
* http://stackoverflow.com/questions/10053358/measuring-the-distance-between-two-coordinates-in-php
*/

require_once dirname(__FILE__) . '/includes/geo.api.inc';
require_once dirname(__FILE__) . '/includes/field.formatters.inc';
require_once dirname(__FILE__) . '/includes/blocks.inc';


function custom_maps_leaflet_map_info() {
  $array = array(
    'mymodule' => array(
      'label' => 'custom_maps',
      'description' => t('This is the custom_maps map style.'),
      'settings' => array(
        'zoom' => 5,
        'minZoom' => 1,
        'maxZoom' => 18,
        'dragging' => TRUE,
        'touchZoom' => TRUE,
        'scrollWheelZoom' => TRUE,
        'doubleClickZoom' => TRUE,
        'zoomControl' => TRUE,
        'attributionControl' => TRUE,
        'trackResize' => TRUE,
        'fadeAnimation' => TRUE,
        'zoomAnimation' => TRUE,
        'closePopupOnClick' => TRUE,
      ),
      'attribution' => array(
        'prefix' => '',
      ),
      'layers' => array(
        'earth' => array(
          'type' => 'mymodule',
          'urlTemplate' => 'http://{s}.tile.stamen.com/toner/{z}/{x}/{y}.png',
          'options' => array(
            'attribution' => NULL,
            'noWrap' => TRUE,
          ),
        ),
      ),
    ),
  );
  return array();

}


function custom_maps_preprocess_node(&$variables) {

  if ($variables['type'] == 'activity') {
    
    // dpm('UES');
    // drupal_add_js(drupal_get_path('module', 'custom_maps') . '/js/map-build.js', array(
    //   'type' => 'file',
    //   // 'every_page' => TRUE,
    //   'scope' => 'footer',
    //   'preprocess' => TRUE,
    //   'weight' => 150,
    // ));

    // $map = leaflet_map_get_info('osm-cycle');
    $map = leaflet_map_get_info('google-roadmap');
    $map['settings']['scrollWheelZoom'] = FALSE;

    // $features = array(

    //   array(
    //     'type' => 'linestring',
    //     'points' => array(
    //       0 => array('lat' => 13.24, 'lon' => 12.32),
    //       1 => array('lat' => 13.24, 'lon' => 13.32),
    //       2 => array('lat' => 13.24, 'lon' => 14.32),
    //       3 => array('lat' => 13.24, 'lon' => 15.32),
    //       4 => array('lat' => 13.24, 'lon' => 16.32),
    //     ),
    //     // 'popup' => l($variables['title'], 'node/' . $variables['nid']),
    //     'leaflet_id' => 'mapbox'
    //   )

    // );
    $features[] = custom_maps_get_linestring_from_node($variables['node']);

    $variables['content']['map_box'][0]['#markup'] = leaflet_render_map($map, $features, '300px');
  }
}

/**
* @deprecated
*/
function custom_maps_get_linestring_from_node_json($node) {

  if ( class_exists('GPX') ) {
    $gpx = file_get_contents($node->field_map_file['und'][0]['uri']);
    $gpx_reader = new GPX();
    $geometry = $gpx_reader->read($gpx,TRUE);
    $json =  (array) json_decode($geometry->out('json'));
    
  } else {
    $json = array();
  }

  $json['leaflet_id'] = $node->nid;
  $json['type'] = 'linestring';
  $json['points'] = ( isset($json['coordinates']) ) ? $json['coordinates'] : array();
  unset($json['coordinates']);

  foreach ($json['points'] as $index => $point) {
    $aux = array('lat' => strval($point[1]), 'lon' => strval($point[0]));
    $json['points'][$index] = $aux;
  }


  return $json;
}

function custom_maps_get_linestring_from_node($node) {

  $linestring = array();
  $linestring['type'] = 'linestring';
  $linestring['points'] = array();
  $linestring['leaflet_id'] = $node->nid;

  if ( isset($node->field_track_points['und']) ) {
    foreach ($node->field_track_points['und'] as $index => $point) {
      $linestring['points'][] = $point;
    }
  }

  return $linestring;
}

function custom_maps_node_presave($node) {

  if ( $node->type == 'activity') {
    custom_maps_activity_add_trackinfo($node);
    custom_maps_calculate_totals($node);
  }

}

function __get_map_file_uri($node) {

  $field_map_file = NULL;

  if ( isset($node->field_map_file['und'][0]['uri']) ) {
    $field_map_file = $node->field_map_file['und'][0]['uri'];
  } else {

    if ( isset($node->field_map_file['und'][0]['fid']) ) {
      $file_obj = file_load($node->field_map_file['und'][0]['fid']);
      if ( $file_obj ) {
        $field_map_file = $file_obj->uri;
      }
    } 

    if ( isset($node->original->field_map_file['und'][0]['uri']) && $field_map_file == NULL) {
      $field_map_file = $node->original->field_map_file['und'][0]['uri'];
    } 
  }

  return $field_map_file;
}

function custom_maps_activity_add_trackinfo($node) {
    $field_map_file = __get_map_file_uri($node);

    if ( isset($field_map_file) ) {

      $xml_data = new SimpleXMLElement(file_get_contents($field_map_file));

      unset($node->field_track_points[LANGUAGE_NONE]);
      unset($node->field_track_elevations[LANGUAGE_NONE]);
      unset($node->field_track_times[LANGUAGE_NONE]);

      switch ( strtolower(pathinfo($field_map_file, PATHINFO_EXTENSION)) ) {
        case 'gpx':
          custom_maps_process_gpx_file($node, $xml_data);
          break;
        case 'tcx':
          custom_maps_process_tcx_file($node, $xml_data);
          break;
        
        default:
          # code...
          break;
      }
    }

}

function custom_maps_process_gpx_file($node, $gpx_data) {

  if ($gpx_data->metadata->time) {
    $node->field_date[LANGUAGE_NONE][0]['value'] = strtotime((string) $gpx_data->metadata->time);
  }

  $index = 0;
  foreach ( $gpx_data->trk->trkseg->trkpt as $trkpt ) {
    // custom_maps_add_trackpoint($node, $trkpt, $index);

    $geodata = custom_maps_add_geodata($trkpt);

    $node->field_track_points[LANGUAGE_NONE][$index] = $geodata;
    $node->field_track_elevations[LANGUAGE_NONE][$index]['value'] = (float) $trkpt->ele;
    $node->field_track_times[LANGUAGE_NONE][$index]['value'] = strtotime((string) $trkpt->time);
    $index++;

  }

}

function custom_maps_process_tcx_file($node, $tcx_data) {


  $index = 0;
  foreach ( $tcx_data->Activities->Activity->Lap->Track->Trackpoint as $trkpt) {
    $trackpoint = array('lat' => $trkpt->Position->LatitudeDegrees, 'lon' =>  $trkpt->Position->LongitudeDegrees);

    $geodata = custom_maps_add_geodata($trackpoint);
    $node->field_track_points[LANGUAGE_NONE][$index] = $geodata;
    $node->field_track_times[LANGUAGE_NONE][$index]['value'] = strtotime((string) $trkpt->Time);
    $node->field_track_elevations[LANGUAGE_NONE][$index]['value'] = isset($trkpt->AltitudeMeters) ? (float) $trkpt->AltitudeMeters : 0;
    if ( (float) $trkpt->AltitudeMeters == 0 && $index > 0 )
      $node->field_track_elevations[LANGUAGE_NONE][$index]['value'] = $node->field_track_elevations[LANGUAGE_NONE][$index -1]['value'];

    $index++;
  }

  if ( $node->field_track_elevations[LANGUAGE_NONE][0]['value'] == 0 && isset($node->field_track_elevations[LANGUAGE_NONE][1]['value']) )
    $node->field_track_elevations[LANGUAGE_NONE][0]['value'] = $node->field_track_elevations[LANGUAGE_NONE][1]['value'];

  if ( $index > 0) {
    $node->field_date[LANGUAGE_NONE][0]['value'] = $node->field_track_times[LANGUAGE_NONE][0]['value'];
    
  }
}




function custom_maps_calculate_totals($node) {


  $count = count($node->field_track_points[LANGUAGE_NONE]);
  $total_distance = 0;
  $total_time = $node->field_track_times[LANGUAGE_NONE][$count -1]['value'] - 
                  $node->field_track_times[LANGUAGE_NONE][0]['value'];


  if ( $total_time > 0) {

    $max_speed = 0;
    $max_altitude = 0;
    $min_altitude = 20000;
    $ascent = 0;
    $descent = 0;

    foreach ( $node->field_track_points[LANGUAGE_NONE] as $index => $point ) {
      $last_point = ( isset($last_point) ) ? $last_point : $point;

      $distance = custom_maps_calculate_distance($last_point, $point);
      $seconds = ( $index > 0) ? 
                  $node->field_track_times[LANGUAGE_NONE][$index]['value'] - $node->field_track_times[LANGUAGE_NONE][$index-1]['value'] : 0;

      $int_speed = ( $seconds) ? ($distance / $seconds) * 3.6 : 0;
      if ( $int_speed > $max_speed ) {
        $max_speed = $int_speed;
      }

      $elevation = isset($node->field_track_elevations[LANGUAGE_NONE][$index]['value']) ? $node->field_track_elevations[LANGUAGE_NONE][$index]['value'] : 0;

      if ( $elevation > 0 ) {

        if ( $elevation > $max_altitude ) {
          $max_altitude = $elevation;
        }

        if ( $elevation < $min_altitude ) {
          $min_altitude = $elevation;
        }

        if ( $index > 0 ) {
          $past_elevation = $node->field_track_elevations[LANGUAGE_NONE][$index-1]['value'];
          if ( $elevation >= $past_elevation ) {
            $ascent += $elevation - $past_elevation;
          } else {
            $descent += $past_elevation - $elevation;
          }
        }
      }
            
      $total_distance += $distance;
      $last_point = $point;
    }

    $node->field_total_time[LANGUAGE_NONE][0]['value'] = $total_time;
    $node->field_distance[LANGUAGE_NONE][0]['value'] = $total_distance;
    $node->field_max_speed[LANGUAGE_NONE][0]['value'] = $max_speed;
    $node->field_average_speed[LANGUAGE_NONE][0]['value'] = ($total_distance / $total_time) * 3.6 ;
    $node->field_average_pace[LANGUAGE_NONE][0]['value'] = ( $total_time / ($total_distance / 1000) ) ;
    $node->field_max_altitude[LANGUAGE_NONE][0]['value'] = $max_altitude;
    $node->field_min_altitude[LANGUAGE_NONE][0]['value'] = $min_altitude;
    $node->field_ascent[LANGUAGE_NONE][0]['value'] = $ascent;
    $node->field_descent[LANGUAGE_NONE][0]['value'] = $descent;

  }
  
}