mirror of
https://github.com/10h30/wp-strava.git
synced 2026-07-11 18:56:18 +09:00
Justin Foell
120 lines
4.0 KiB
PHP
120 lines
4.0 KiB
PHP
<?php
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class WPStrava_StaticMap {
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private static $max_chars = 1865;
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/**
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* Get an image tag to a static google map. Will render with
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* detailed polyline if not greater than 1865 chars, otherwise
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* rendering will use summary polyline.
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*
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* @static
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* @access public
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* @param object $activity Activity object to get image tag for.
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* @param int $height Height of map in pixels.
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* @param int $width Width of map in pixels.
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* @param bool $markers Display start and finish markers.
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* @param string $title Title attribute to accompany image (default empty).
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* @return string HTML img tag with static map image.
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*/
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public static function get_image_tag( $activity, $height = 320, $width = 480, $markers = false, $title = '' ) {
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$key = WPStrava::get_instance()->settings->gmaps_key;
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// Short circuit if missing key or activity object doesn't have the data we need.
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if ( empty( $key ) || empty( $activity->map ) ) {
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return '';
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}
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if ( ! $height || ! $width ) {
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$height = 320;
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$width = 480;
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}
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$url = "https://maps.googleapis.com/maps/api/staticmap?maptype=terrain&size={$width}x{$height}&scale=2&sensor=false&key={$key}&path=color:0xFF0000BF|weight:2|enc:";
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$url_len = strlen( $url );
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$polyline = '';
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if ( ! empty( $activity->map->polyline ) && ( $url_len + strlen( $activity->map->polyline ) < self::$max_chars ) ) {
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$polyline = $activity->map->polyline;
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} elseif ( ! empty( $activity->map->summary_polyline ) ) {
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$polyline = $activity->map->summary_polyline;
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} elseif ( ! empty( $activity->map->polyline ) ) {
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// Need to reduce the polyline b/c it's too big and no summary was provided.
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$polyline = self::reduce_polyline( $url_len, $activity->map->polyline );
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}
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$url .= $polyline;
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if ( $markers ) {
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$points = self::decode_start_finish( $polyline );
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$markers = '&markers=color:green|' . $points['start'][0] . ',' . $points['start'][1] .
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'&markers=color:red|' . $points['finish'][0] . ',' . $points['finish'][1];
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$url .= $markers;
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}
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$title_attr = $title ? " title='" . esc_attr( $title ) . "'" : '';
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return "<img class='wp-strava-img' src='{$url}'{$title_attr} />";
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}
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/**
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* From an encoded polyline, get the start and finish points for
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* the purposes of displaying start and finish markers.
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*
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* @static
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* @see https://developers.google.com/maps/documentation/utilities/polylinealgorithm
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* @access private
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* @param string $enc Encoded polyline.
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* @return array {
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* Indexes of start & finish containing lat/lon for each.
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* @type array $start {
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* @type float $0 Latitude
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* @type float $1 Longitude
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* }
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* @type array $finish {
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* @type float $0 Latitude
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* @type float $1 Longitude
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* }
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* }
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*/
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private static function decode_start_finish( $enc ) {
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require_once WPSTRAVA_PLUGIN_DIR . 'src/Polyline.php';
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$points = Polyline::decode( $enc );
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$points = Polyline::pair( $points );
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return array(
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'start' => $points[0],
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'finish' => end( $points ),
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);
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}
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/**
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* From a (large) encoded polyline, reduce the number of points
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* until it is small enough for a GET URL.
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*
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* @param int $url_len Length of map URL.
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* @param string $enc Encoded polyline.
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* @return string Smaller encoded polyline.
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* @author Justin Foell <justin@foell.org>
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* @since 2.9.2
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*/
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private static function reduce_polyline( $url_len, $enc ) {
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require_once WPSTRAVA_PLUGIN_DIR . 'src/Polyline.php';
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$points = Polyline::decode( $enc );
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$points = Polyline::pair( $points );
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// Reduce by half https://stackoverflow.com/a/6519046/2146022
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$keys = range( 0, count( $points ), 2 );
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$points = array_values( array_intersect_key( $points, array_combine( $keys, $keys ) ) );
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$points = Polyline::flatten( $points );
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$polyline = Polyline::encode( $points );
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if ( $url_len + strlen( $polyline ) >= self::$max_chars ) {
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// Reduce again.
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$polyline = self::reduce_polyline( $url_len, $polyline );
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}
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return $polyline;
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}
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}
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