dbClass = new dbClass();
}
function getLatitudeLongitude($zip)
{
//Returns latitude and longitude of a given zipcode
$query = "SELECT latitude, longitude FROM ctrak_zipcodes WHERE zipcode = ".$zip;
$results = $this->dbClass->query($query);
return $results;
}
function getZipArray($zip, $distance = 10)
{
//Given a zipcode and a distance, returns an comma separated list of zipcodes within this distance
//If distance = 0 change to a very small distance
if ($distance==0) $distance = 0.001;
//Get zipcode location
$location = $this->getLatitudeLongitude($zip);
if(isset($location[0])) {
$latitude = $location[0]['latitude'];
$longitude = $location[0]['longitude'];
//Get rectangle area
$this->RadiusAssistant($latitude, $longitude, $distance);
//Select all zipcodes within rectangle
$query = "SELECT zipcode FROM ctrak_zipcodes WHERE latitude <= ".$this->maxLat." AND latitude >= ".$this->minLat;
$query.= " AND longitude <= ".$this->maxLong." AND longitude >= ".$this->minLong;
$results = $this->dbClass->query($query);
$list = array();
foreach ($results as $key=>$value) {
$list[] = $value['zipcode'];
}
$result = implode(",",$list);
} else {
$result ="";
}
return $result;
}
function Calculate(
$dblLat1,
$dblLong1,
$dblLat2,
$dblLong2 ) {
$EARTH_RADIUS_MILES = 3963;
$dist = 0;
//convert degrees to radians
$dblLat1 = $dblLat1 * M_PI / 180;
$dblLong1 = $dblLong1 * M_PI / 180;
$dblLat2 = $dblLat2 * M_PI / 180;
$dblLong2 = $dblLong2 * M_PI / 180;
if ($dblLat1 != $dblLat2 || $dblLong1 != $dblLong2)
{
//the two points are not the same
$dist =
sin($dblLat1) * sin($dblLat2)
+ cos($dblLat1) * cos($dblLat2)
* cos($dblLong2 - $dblLong1);
$dist =
$EARTH_RADIUS_MILES
* (-1 * atan($dist / sqrt(1 - $dist * $dist)) + M_PI / 2);
}
return $dist;
}
function RadiusAssistant($Latitude, $Longitude, $Miles) {
$EQUATOR_LAT_MILE = 69.172;
$this->maxLat = $Latitude + $Miles / $EQUATOR_LAT_MILE;
$this->minLat = $Latitude - ($this->maxLat - $Latitude);
$this->maxLong = $Longitude + $Miles / (cos($this->minLat * M_PI / 180) * $EQUATOR_LAT_MILE);
$this->minLong = $Longitude - ($this->maxLong - $Longitude);
}
}
?>
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