/**
* Returns elevation data for points along a path.
*
* @param array $points Array containing data points with indices [lat,lng]
* @param int $points_per_mile Number of data points per mile
* @return array Elevation data as array with form [distance, elevation]
*/
public static function getElevationForPath($points, $points_per_mile = 5)
{
if (!is_array($points)) {
return false;
}
$mark_dist = 1 / $points_per_mile;
$prev_dist = 0;
$markers = array();
$count = count($points);
for ($i = 0; $i < $count - 1; $i++) {
$point1 = $points[$i];
$point2 = $points[$i + 1];
$dist = self::_getLatLngDistance($point1, $point2);
$avail_dist = $prev_dist + $dist;
while ($avail_dist >= $mark_dist) {
$cover_dist = $prev_dist > 0 ? $mark_dist - $prev_dist : $mark_dist;
$scale = $cover_dist / $dist;
$lat = $point1["lat"] + $scale * ($point2["lat"] - $point1["lat"]);
$lng = $point1["lng"] + $scale * ($point2["lng"] - $point1["lng"]);
$markers[] = array("lat" => $lat, "lng" => $lng, "dist" => (count($markers) + 1) * $mark_dist);
$avail_dist -= $mark_dist;
$prev_dist = 0;
}
$prev_dist = $avail_dist;
}
$elevations = array();
foreach ($markers as $marker) {
if ($elevation = Elevation::getElevation($marker["lat"], $marker["lng"])) {
$elevations[] = array($marker["dist"], $elevation);
} else {
return false;
}
}
return $elevations;
}
/**
* This test is to help determine the parameters for the nearest
* elevation search.
*
* @return unknown_type
*/
public function testGetNearestReturnCount()
{
$lat = 39.90574640039131;
$lng = -86.18072318611667;
$points = 3;
$data = Elevation::_getNearestElevations($lat, $lng, 3);
//make sure we have data
$this->assertNotEqual(false, $data);
//make sure we have enough points
// TODO: use a supported assertion
//$this->assertGreaterThanOrEqual($points, count($data));
//make sure we do not have too many
//$this->assertLessThan(6, count($data));
}
public function action_elevation_add_packed()
{
if ($_FILES["packed_hdr"]) {
move_uploaded_file($_FILES["packed_hdr"]["tmp_name"], SYSTEM_ROOT . "/elev_packed.hdr");
}
if ($_FILES["packed_flt"]) {
move_uploaded_file($_FILES["packed_flt"]["tmp_name"], SYSTEM_ROOT . "/elev_packed.flt");
}
$region = array_safe($_POST, "region_name", "Elevation data");
Elevation::addElevationToDatabase(SYSTEM_ROOT . "/elev_packed", 1, $region);
unlink(SYSTEM_ROOT . "/elev_packed.hdr");
unlink(SYSTEM_ROOT . "/elev_packed.flt");
Notification::add("Elevation data has been added");
Page::redirect("/admin/elevation");
}
/**
* Function is called to update the elevation data of the route.
*
* @return int|bool Number of rows affected. false indicates no data nearby.
*/
public function _updateElevationData()
{
$points = json_decode($this->points);
if (!isset($points->points)) {
return false;
}
$points = $points->points;
$points = $this->_decodePolylineToArray($points);
if (($elevations = Elevation::getElevationForPath($points)) === false) {
return false;
}
$this->elevation = json_encode($elevations);
$stmt = Database::getDB()->prepare("\r\n\t\t\tUPDATE routes\r\n\t\t\tSET\r\n\t\t\t\tr_elevation = ?\r\n\t\t\tWHERE \r\n\t\t\t\tr_id = ?\r\n\t\t");
$stmt->bind_param("si", $this->elevation, $this->id);
$stmt->execute();
$stmt->store_result();
$rows = $stmt->affected_rows;
$stmt->close();
return $rows;
}
