Cloudlog/application/libraries/Qra.php

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5.4 KiB
PHP

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Qra {
/*
* Class Description: QRA handles manipulation of the Gridsquares used within amateur radio
*
* Units of measurement are the following
*
* Info: Distance Function
*
* M = Miles
* K = Kilometers
* N = Nautical Miles
*/
// Name: qra2latlong
// Task: convert qra to lat/long
function qra2latlong($strQRA)
{
return qra2latlong($strQRA);
}
// calculate the bearing between two squares
function bearing($tx, $rx, $unit = 'M') {
if(strlen($tx) > 6) {
$tx = substr($tx, 0, 6);
}
if(strlen($rx) > 6) {
$rx = substr($rx, 0, 6);
}
$my = qra2latlong($tx);
$stn = qra2latlong($rx);
$bearing = bearing($my[0], $my[1], $stn[0], $stn[1], $unit);
return $bearing;
}
/*
* Function: calculate the distance between two gridsqaures
*
* Inputs are QRA's TX and TX and the unit
*
*/
function distance($tx, $rx, $unit = 'M') {
if(strlen($tx) > 6) {
$tx = substr($tx, 0, 6);
}
if(strlen($rx) > 6) {
$rx = substr($rx, 0, 6);
}
// Calc LatLongs
$my = qra2latlong($tx);
$stn = qra2latlong($rx);
// Feed in Lat Longs plus the unit type
try
{
$total_distance = distance($my[0], $my[1], $stn[0], $stn[1], $unit);
}
catch (Exception $e)
{
$total_distance = 0;
}
// Return the distance
return $total_distance;
}
/*
* Function returns just the bearing
* Input locator1 and locator2
*/
function get_bearing($tx, $rx) {
$my = qra2latlong($tx);
$stn = qra2latlong($rx);
return get_bearing($my[0], $my[1], $stn[0], $stn[1]);
}
/*
Find the Midpoint between two gridsquares using lat / long
Needs following passed
$coords[]=array('lat' => '53.344104','lng'=>'-6.2674937');
$coords[]=array('lat' => '51.5081289','lng'=>'-0.128005');
*/
function get_midpoint($coords)
{
$count_coords = count($coords);
$xcos=0.0;
$ycos=0.0;
$zsin=0.0;
foreach ($coords as $lnglat)
{
$lat = $lnglat['lat'] * pi() / 180;
$lon = $lnglat['lng'] * pi() / 180;
$acos = cos($lat) * cos($lon);
$bcos = cos($lat) * sin($lon);
$csin = sin($lat);
$xcos += $acos;
$ycos += $bcos;
$zsin += $csin;
}
$xcos /= $count_coords;
$ycos /= $count_coords;
$zsin /= $count_coords;
$lon = atan2($ycos, $xcos);
$sqrt = sqrt($xcos * $xcos + $ycos * $ycos);
$lat = atan2($zsin, $sqrt);
return array($lat * 180 / pi(), $lon * 180 / pi());
}
}
function distance($lat1, $lon1, $lat2, $lon2, $unit = 'M') {
$theta = $lon1 - $lon2;
$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
$dist = acos($dist);
$dist = rad2deg($dist);
$dist = $dist * 60 * 1.1515;
if ($unit == "K") {
$dist *= 1.609344;
} else if ($unit == "N") {
$dist *= 0.8684;
}
return round($dist, 1);
}
function bearing($lat1, $lon1, $lat2, $lon2, $unit = 'M') {
$dist = distance($lat1, $lon1, $lat2, $lon2, $unit);
$dist = round($dist, 0);
$bearing = get_bearing($lat1, $lon1, $lat2, $lon2);
$dirs = array("N","E","S","W");
$rounded = round($bearing / 22.5) % 16;
if (($rounded % 4) == 0) {
$dir = $dirs[$rounded / 4];
} else {
$dir = $dirs[2 * floor(((floor($rounded / 4) + 1) % 4) / 2)];
$dir .= $dirs[1 + 2 * floor($rounded / 8)];
#if ($rounded % 2 == 1)
# $dir = $dirs[round_to_int($rounded/4) % 4] . "-" . $dir;
}
$var_dist = "";
#return $dir;
if (isset($dist)) {
$var_dist = $dist;
switch ($unit) {
case 'M':
$var_dist .= " miles";
break;
case 'N':
$var_dist .= " nautic miles";
break;
case 'K':
$var_dist .= " kilometers";
break;
}
}
return round($bearing, 0)."&#186; ".$dir." ".$var_dist;
}
function get_bearing($lat1, $lon1, $lat2, $lon2) {
return (int)(rad2deg(atan2(sin(deg2rad($lon2) - deg2rad($lon1)) * cos(deg2rad($lat2)), cos(deg2rad($lat1)) * sin(deg2rad($lat2)) - sin(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($lon2) - deg2rad($lon1)))) + 360) % 360;
}
function qra2latlong($strQRA) {
if (strpos($strQRA, ',') !== false) {
$gridsquareArray = explode(',', $strQRA);
$strQRA = $gridsquareArray[0];
}
if ((strlen($strQRA) % 2 == 0) && (strlen($strQRA) <= 8)) { // Check if QRA is EVEN (the % 2 does that) and smaller/equal 8
$strQRA = strtoupper($strQRA);
if (strlen($strQRA) == 4) $strQRA .= "MM"; // Only 4 Chars? Fill with center "MM"
if (strlen($strQRA) == 6) $strQRA .= "55"; // Only 6 Chars? Fill with center "55"
if (!preg_match('/^[A-R]{2}[0-9]{2}[A-X]{2}[0-9]{2}$/', $strQRA)) {
return false;
}
list($a, $b, $c, $d, $e, $f, $g, $h) = str_split($strQRA, 1); // Maidenhead is always alternating. e.g. "AA00AA00AA00" - doesn't matter how deep. 2 chars, 2 numbers, etc.
$a = ord($a) - ord('A');
$b = ord($b) - ord('A');
$c = ord($c) - ord('0');
$d = ord($d) - ord('0');
$e = ord($e) - ord('A');
$f = ord($f) - ord('A');
$g = ord($g) - ord('0');
$h = ord($h) - ord('0');
$nLong = ($a*20) + ($c*2) + (($e+0.5)/12) + (($g-5)/120) - 180; // the 4th pair is "in the middle", so we've to substract 5
$nLat = ($b*10) + $d + (($f+0.5)/24) + (($h-5)/240) - 90;
$arLatLong = array($nLat, $nLong);
return $arLatLong;
} else {
return array(0, 0);
}
}
/* End of file Qra.php */