function ScanAirspaceCircleBounds($i, $bearing) {
global $AirspaceArea;
list($lat,$lon)= FindLatitudeLongitude($AirspaceArea[$i]->Latitude,
$AirspaceArea[$i]->Longitude, $bearing, $AirspaceArea[$i]->Radius,1,1 );
$AirspaceArea[$i]->minx = min($lon, $AirspaceArea[$i]->minx);
$AirspaceArea[$i]->maxx = max($lon, $AirspaceArea[$i]->maxx);
$AirspaceArea[$i]->miny = min($lat, $AirspaceArea[$i]->miny);
$AirspaceArea[$i]->maxy = max($lat, $AirspaceArea[$i]->maxy);
}
function CalculateCircle($lat, $lng, $radius)
{
$Rotation = 1;
$StartBearing = 0;
$EndBearing = 360 - 8;
list($StartLat, $StartLon) = FindLatitudeLongitude($lat, $lng, 0, $radius, 1, 1);
list($EndLat, $EndLon) = FindLatitudeLongitude($lat, $lng, $EndBearing, $radius, 1, 1);
$points = array();
$i = 0;
$points[$i]->lat = $StartLat;
$points[$i]->lng = $StartLon;
$i++;
while (abs($EndBearing - $StartBearing) > 10) {
$StartBearing += $Rotation * 10;
if ($StartBearing > 360) {
$StartBearing -= 360;
}
if ($StartBearing < 0) {
$StartBearing += 360;
}
list($lat_temp, $lng_temp) = FindLatitudeLongitude($lat, $lng, $StartBearing, $radius, 1, 1);
$points[$i]->lat = $lat_temp;
$points[$i]->lng = $lng_temp;
$i++;
}
$points[$i]->lat = $EndLat;
$points[$i]->lng = $EndLon;
$i++;
$points[$i]->lat = $StartLat;
$points[$i]->lng = $StartLon;
return $points;
}
