/**
* @param $id
* @return bool|\stdClass
*/
function get_activity($id)
{
$map_return = new stdClass();
$activity = $this->strava_get('/activities/' . $id);
if (empty($activity->map->polyline)) {
return FALSE;
} else {
$points = decodePolylineToArray($activity->map->polyline);
if (empty($points)) {
return FALSE;
}
$businesses = array();
$last_api_point = null;
// Collect businesses along the route every YELP_METRES_PER_CALL metres.
foreach ($points as $point) {
if (empty($last_api_point) || $this->haversineGreatCircleDistance($last_api_point, $point) > self::YELP_METRES_PER_CALL) {
$last_api_point = $point;
$locations = $this->get_locations($point);
// Build an array of unique business locations.
if (!empty($locations) && !empty($locations->businesses)) {
foreach ($locations->businesses as $business) {
if (empty($businesses[$business->id])) {
$businesses[$business->id] = $business;
}
}
}
}
}
// For each point on the route, check the distance to each business and store
// the lowest distance for each.
foreach ($points as $point) {
foreach ($businesses as &$business) {
$distance = $this->haversineGreatCircleDistance(array($business->location->coordinate->latitude, $business->location->coordinate->longitude), $point);
if (empty($business->stracof_distance) || $distance < $business->stracof_distance) {
$business->stracof_distance = round($distance);
}
}
}
$total_points = 0;
// Calculate distance under YELP_MAX_METRES_FOR_POINTS and multiply by points
// value minus YELP_NEUTRAL_RATING to give a positive or negative score per business.
foreach ($businesses as &$business) {
$distance = self::YELP_MAX_METRES_FOR_POINTS - $business->stracof_distance;
if ($distance > 0 && $business->rating > 0) {
$points = $business->rating - self::YELP_NEUTRAL_RATING;
$business->stracof_points = round($points * $distance);
$total_points += $business->stracof_points;
}
}
// Return the polyline, total and array values for businesses, as it won't
// be an array in JS if we leave the array keys in place.
$map_return->polyline = $activity->map->polyline;
$map_return->businesses = array_values($businesses);
$map_return->total_points = $total_points;
}
return $map_return;
}
* The encoding algorithm is detailed here:
* http://code.google.com/apis/maps/documentation/polylinealgorithm.html
*
* This function is based off of Mark McClure's JavaScript polyline decoder
* (http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/decode.js)
* which was in turn based off Google's own implementation.
*
* This function assumes a validly encoded polyline. The behaviour of this
* function is not specified when an invalid expression is supplied.
*
* @param String $encoded the encoded polyline.
* @return Array an Nx2 array with the first element of each entry containing
* the latitude and the second containing the longitude of the
* corresponding point.
*/
$arr = decodePolylineToArray('zebeCzes|Gx@Ma@oCs@qEe@qCe@wC}@yFiAmHw@uFe@wCe@oCPSLiCTmCTyCd@mEVsDn@_Gd@eCLaCcB_ByEuCgCoD{@qCQwDLcEl@aFx@uDxAkDXmBq@wEeA_GgAeF{ATwBwCa@qAqJuLmG{IaBaCwB{BUw@sAeBc@kIi@uJUwCiA_D_AkFq@gAi@qDoAcAq@TgA[');
print_r($arr);
function decodePolylineToArray($encoded)
{
$length = strlen($encoded);
$index = 0;
$points = array();
$lat = 0;
$lng = 0;
while ($index < $length) {
// Temporary variable to hold each ASCII byte.
$b = 0;
// The encoded polyline consists of a latitude value followed by a
// longitude value. They should always come in pairs. Read the
// latitude value first.
$shift = 0;
