wp-gpx-maps/wp-gpx-maps_Utils.php

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<?php
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function sitePath()
{
return substr(substr(__FILE__, 0, strrpos(__FILE__,'wp-content')), 0, -1);
// $uploadsPath = substr($uploadsPath, 0, -1);
}
function gpxFolderPath()
{
$upload_dir = wp_upload_dir();
$uploadsPath = $upload_dir['basedir'];
$ret = $uploadsPath.DIRECTORY_SEPARATOR."gpx";
return str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $ret);
}
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function gpxCacheFolderPath()
{
$upload_dir = wp_upload_dir();
$uploadsPath = $upload_dir['basedir'];
$ret = $uploadsPath.DIRECTORY_SEPARATOR."gpx".DIRECTORY_SEPARATOR."cache";
return str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $ret);
}
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function relativeGpxFolderPath()
{
$sitePath = sitePath();
$realGpxPath = gpxFolderPath();
$ret = str_replace($sitePath,'',$realGpxPath).DIRECTORY_SEPARATOR;
return str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $ret);
}
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function recursive_remove_directory($directory, $empty=FALSE)
{
if(substr($directory,-1) == '/')
{
$directory = substr($directory,0,-1);
}
if(!file_exists($directory) || !is_dir($directory))
{
return FALSE;
}elseif(is_readable($directory))
{
$handle = opendir($directory);
while (FALSE !== ($item = readdir($handle)))
{
if($item != '.' && $item != '..')
{
$path = $directory.'/'.$item;
if(is_dir($path))
{
recursive_remove_directory($path);
}else{
unlink($path);
}
}
}
closedir($handle);
if($empty == FALSE)
{
if(!rmdir($directory))
{
return FALSE;
}
}
}
return TRUE;
}
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function getPoints($gpxPath,$gpxOffset = 10, $donotreducegpx)
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{
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$points = array();
$dist=0;
$lastLat=0;
$lastLon=0;
$lastEle=0;
$lastOffset=0;
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if (file_exists($gpxPath))
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{
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$points = parseXml($gpxPath, $gpxOffset);
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}
else
{
array_push($points, array((float)0,(float)0,(float)0,(float)0));
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echo "File $gpxPath not found!";
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}
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// reduce the points to around 200 to speedup
if ( $donotreducegpx != true)
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{
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$count=sizeof($points);
if ($count>200)
{
$f = round($count/200);
if ($f>1)
for($i=$count;$i>0;$i--)
if ($i % $f != 0)
unset($points[$i]);
}
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}
return $points;
}
function parseXml($filePath, $gpxOffset)
{
$points = array();
$gpx = simplexml_load_file($filePath);
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if($gpx === FALSE)
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return;
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$gpx->registerXPathNamespace('10', 'http://www.topografix.com/GPX/1/0');
$gpx->registerXPathNamespace('11', 'http://www.topografix.com/GPX/1/1');
$gpx->registerXPathNamespace('gpxx', 'http://www.garmin.com/xmlschemas/GpxExtensions/v3');
$nodes = $gpx->xpath('//trkpt | //10:trkpt | //11:trkpt');
if ( count($nodes) > 0 )
{
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$lastLat = 0;
$lastLon = 0;
$lastEle = 0;
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$lastTime = 0;
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$dist = 0;
$lastOffset = 0;
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$speedBuffer = array();
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// normal case
foreach($nodes as $trkpt)
{
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$lat = $trkpt['lat'];
$lon = $trkpt['lon'];
$ele = $trkpt->ele;
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$time = $trkpt->time;
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$speed = (float)$trkpt->speed;
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if ($lastLat == 0 && $lastLon == 0)
{
//Base Case
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array_push($points, array((float)$lat,(float)$lon,(float)round($ele,2),(float)round($dist,2), 0 ));
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$lastLat=$lat;
$lastLon=$lon;
$lastEle=$ele;
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$lastTime=$time;
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}
else
{
//Normal Case
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$offset = calculateDistance((float)$lat, (float)$lon, (float)$ele, (float)$lastLat, (float)$lastLon, (float)$lastEle);
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$dist = $dist + $offset;
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if ($speed == 0)
{
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$datediff = (float)my_date_diff($lastTime,$time);
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//echo "------------$time-------$lastTime-----";
//echo "------------$datediff------------";
if ($datediff>0)
{
$speed = $offset / $datediff;
}
}
array_push($speedBuffer, $speed);
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if (((float) $offset + (float) $lastOffset) > $gpxOffset)
{
//Bigger Offset -> write coordinate
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$avgSpeed = 0;
foreach($speedBuffer as $s)
{
$avgSpeed += $s;
}
$avgSpeed = $avgSpeed / count($speedBuffer);
$speedBuffer = array();
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$lastOffset=0;
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array_push($points, array(
(float)$lat,
(float)$lon,
(float)round($ele,1),
(float)round($dist,1),
(float)round($avgSpeed,1)
)
);
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}
else
{
//Smoller Offset -> continue..
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$lastOffset = (float) $lastOffset + (float) $offset ;
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}
}
$lastLat=$lat;
$lastLon=$lon;
$lastEle=$ele;
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$lastTime=$time;
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}
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unset($nodes);
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}
else
{
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$nodes = $gpx->xpath('//gpxx:rpt');
if ( count($nodes) > 0 )
{
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$lastLat = 0;
$lastLon = 0;
$lastEle = 0;
$dist = 0;
$lastOffset = 0;
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// Garmin case
foreach($nodes as $rpt)
{
$lat = $rpt['lat'];
$lon = $rpt['lon'];
if ($lastLat == 0 && $lastLon == 0)
{
//Base Case
array_push($points, array((float)$lat,(float)$lon,null,null));
$lastLat=$lat;
$lastLon=$lon;
}
else
{
//Normal Case
$offset = calculateDistance($lat, $lon, 0,$lastLat, $lastLon, 0);
$dist = $dist + $offset;
if (((float) $offset + (float) $lastOffset) > $gpxOffset)
{
//Bigger Offset -> write coordinate
$lastOffset=0;
array_push($points, array((float)$lat,(float)$lon,null,null));
}
else
{
//Smoller Offset -> continue..
$lastOffset= (float) $lastOffset + (float) $offset;
}
}
$lastLat=$lat;
$lastLon=$lon;
}
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unset($nodes);
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}
else
{
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echo "Empty Gpx or not supported File!";
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}
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}
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unset($gpx);
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return $points;
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}
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function getWayPoints($gpxPath)
{
$points = array();
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if (file_exists($gpxPath))
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{
$points = array();
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$gpx = simplexml_load_file($gpxPath);
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$gpx->registerXPathNamespace('10', 'http://www.topografix.com/GPX/1/0');
$gpx->registerXPathNamespace('11', 'http://www.topografix.com/GPX/1/1');
$nodes = $gpx->xpath('//wpt | //10:wpt | //11:wpt');
if ( count($nodes) > 0 )
{
// normal case
foreach($nodes as $wpt)
{
$lat = $wpt['lat'];
$lon = $wpt['lon'];
$ele = $wpt->ele;
$time = $wpt->time;
$name = $wpt->name;
$desc = $wpt->desc;
$sym = $wpt->sym;
$type = $wpt->type;
array_push($points, array((float)$lat,(float)$lon,(float)$ele,$time,$name,$desc,$sym,$type));
}
}
}
return $points;
}
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function toRadians($degrees)
{
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return (float)($degrees * 3.1415926535897932385 / 180);
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}
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function calculateDistance($lat1,$lon1,$ele1,$lat2,$lon2,$ele2)
{
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$alpha = (float)sin((float)toRadians((float) $lat2 - (float) $lat1) / 2);
$beta = (float)sin((float)toRadians((float) $lon2 - (float) $lon1) / 2);
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//Distance in meters
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$a = (float) ( (float)$alpha * (float)$alpha) + (float) ( (float)cos( (float)toRadians($lat1)) * (float)cos( (float)toRadians($lat2)) * (float)$beta * (float)$beta );
$dist = 2 * 6369628.75 * (float)atan2((float)sqrt((float)$a), (float)sqrt(1 - (float) $a));
$d = (float)sqrt((float)pow((float)$dist, 2) + pow((float) $lat1 - (float)$lat2, 2));
return sqrt((float)pow((float)$ele1-(float)$ele2,2)+(float)pow((float)$d,2));
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}
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function my_date_diff($old_date, $new_date) {
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$t1 = strtotime($new_date);
$t2 = strtotime($old_date);
// milliceconds fix
$t1 += date_getDecimals($new_date);
$t2 += date_getDecimals($old_date);
$offset = (float)($t1 - $t2);
//echo "$offset = $new_date - $old_date; ".strtotime($new_date)." ".strtotime($old_date)." <br />";
return $offset;
}
function date_getDecimals($date)
{
if (preg_match('(\.([0-9]{2})Z?)', $date, $matches))
{
return (float)((float)$matches[1] / 100);
}
else
{
return 0;
}
}
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?>