settings->gmaps_key;
// Short circuit if missing key or activity object doesn't have the data we need.
if ( empty( $key ) || empty( $activity->map ) ) {
return '';
}
if ( ! $height || ! $width ) {
$height = 320;
$width = 480;
}
$url = "https://maps.googleapis.com/maps/api/staticmap?maptype=terrain&size={$width}x{$height}&scale=2&sensor=false&key={$key}&path=color:0xFF0000BF|weight:2|enc:";
$url_len = strlen( $url );
$polyline = '';
if ( ! empty( $activity->map->polyline ) && ( $url_len + strlen( $activity->map->polyline ) < self::$max_chars ) ) {
$polyline = $activity->map->polyline;
} elseif ( ! empty( $activity->map->summary_polyline ) ) {
$polyline = $activity->map->summary_polyline;
} elseif ( ! empty( $activity->map->polyline ) ) {
// Need to reduce the polyline b/c it's too big and no summary was provided.
$polyline = self::reduce_polyline( $url_len, $activity->map->polyline );
}
$url .= $polyline;
if ( $markers ) {
$points = self::decode_start_finish( $polyline );
$markers = '&markers=color:green|' . $points['start'][0] . ',' . $points['start'][1] .
'&markers=color:red|' . $points['finish'][0] . ',' . $points['finish'][1];
$url .= $markers;
}
$title_attr = $title ? " title='" . esc_attr( $title ) . "'" : '';
return "
";
}
/**
* From an encoded polyline, get the start and finish points for
* the purposes of displaying start and finish markers.
*
* @static
* @see https://developers.google.com/maps/documentation/utilities/polylinealgorithm
* @access private
* @param string $enc Encoded polyline.
* @return array {
* Indexes of start & finish containing lat/lon for each.
* @type array $start {
* @type float $0 Latitude
* @type float $1 Longitude
* }
* @type array $finish {
* @type float $0 Latitude
* @type float $1 Longitude
* }
* }
*/
private static function decode_start_finish( $enc ) {
require_once WPSTRAVA_PLUGIN_DIR . 'src/Polyline.php';
$points = Polyline::decode( $enc );
$points = Polyline::pair( $points );
return array(
'start' => $points[0],
'finish' => end( $points ),
);
}
/**
* From a (large) encoded polyline, reduce the number of points
* until it is small enough for a GET URL.
*
* @param int $url_len Length of map URL.
* @param string $enc Encoded polyline.
* @return string Smaller encoded polyline.
* @author Justin Foell
* @since 2.9.2
*/
private static function reduce_polyline( $url_len, $enc ) {
require_once WPSTRAVA_PLUGIN_DIR . 'src/Polyline.php';
$points = Polyline::decode( $enc );
$points = Polyline::pair( $points );
// Reduce by half https://stackoverflow.com/a/6519046/2146022
$keys = range( 0, count( $points ), 2 );
$points = array_values( array_intersect_key( $points, array_combine( $keys, $keys ) ) );
$points = Polyline::flatten( $points );
$polyline = Polyline::encode( $points );
if ( $url_len + strlen( $polyline ) >= self::$max_chars ) {
// Reduce again.
$polyline = self::reduce_polyline( $url_len, $polyline );
}
return $polyline;
}
}