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Add reduce_polyline()

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This commit is contained in:
Justin Foell
2021-09-24 12:29:45 -05:00
parent 7af6946989
commit be9290f000
1 changed files with 37 additions and 6 deletions
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src/WPStrava/StaticMap.php
+37 -6
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@@ -2,6 +2,8 @@
class WPStrava_StaticMap {
private static $MAX_CHARS = 1865;
/**
* Get an image tag to a static google map. Will render with
* detailed polyline if not greater than 1865 chars, otherwise
@@ -31,13 +33,15 @@ class WPStrava_StaticMap {
$url = "https://maps.googleapis.com/maps/api/staticmap?maptype=terrain&size={$width}x{$height}&scale=2&sensor=false&key={$key}&path=color:0xFF0000BF|weight:2|enc:";
$url_len = strlen( $url );
$max_chars = 1865;
$polyline = '';
if ( ! empty( $activity->map->polyline ) && ( $url_len + strlen( $activity->map->polyline ) < $max_chars ) ) {
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;
@@ -76,13 +80,40 @@ class WPStrava_StaticMap {
require_once WPSTRAVA_PLUGIN_DIR . 'src/Polyline.php';
$points = Polyline::decode( $enc );
$points = Polyline::pair( $points );
$start = $points[0];
$finish = $points[ count( $points ) - 1 ];
return array(
'start' => $start,
'finish' => $finish,
'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 <justin@foell.org>
* @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;
}
}