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

193 lines
4.6 KiB
PHP

<?php
function getPoints($gpxPath,$gpxOffset = 10, $donotreducegpx)
{
$points = array();
$dist=0;
$lastLat=0;
$lastLon=0;
$lastEle=0;
$lastOffset=0;
if (file_exists($gpxPath))
{
$points = parseXml($gpxPath, $gpxOffset);
}
else
{
array_push($points, array((float)0,(float)0,(float)0,(float)0));
echo "File $gpxPath not found!";
}
// reduce the points to around 200 to speedup
if ( $donotreducegpx != true)
{
$count=sizeof($points);
if ($count>200)
{
$f = round($count/200);
if ($f>1)
for($i=$count;$i>0;$i--)
if ($i % $f != 0)
unset($points[$i]);
}
}
return $points;
}
function parseXml($filePath, $gpxOffset)
{
$points = array();
$gpx = simplexml_load_file($filePath);
$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 )
{
// normal case
foreach($nodes as $trkpt)
{
$lat = $trkpt['lat'];
$lon = $trkpt['lon'];
$ele = $trkpt->ele;
if ($lastLat == 0 && $lastLon == 0)
{
//Base Case
array_push($points, array((float)$lat,(float)$lon,(float)round($ele,1),(float)round($dist,1)));
$lastLat=$lat;
$lastLon=$lon;
$lastEle=$ele;
}
else
{
//Normal Case
$offset = calculateDistance($lat, $lon, $ele,$lastLat, $lastLon, $lastEle);
$dist = $dist + $offset;
if (((float) $offset + (float) $lastOffset) > $gpxOffset)
{
//Bigger Offset -> write coordinate
$lastOffset=0;
array_push($points, array((float)$lat,(float)$lon,(float)round($ele,1),(float)round($dist,1)));
}
else
{
echo "j";
//Smoller Offset -> continue..
$lastOffset= (float) $lastOffset + (float) $offset ;
}
}
$lastLat=$lat;
$lastLon=$lon;
$lastEle=$ele;
}
}
else
{
$nodes = $gpx->xpath('//gpxx:rpt');
if ( count($nodes) > 0 )
{
// 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;
}
}
else
{
echo "Gpx Empty or not supported!";
}
}
return $points;
}
function getWayPoints($gpxPath)
{
$points = array();
if (file_exists($gpxPath))
{
$points = array();
$gpx = simplexml_load_file($gpxPath);
$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 $points;
}
function toRadians($degrees)
{
return $degrees * 3.1415926535897932385 / 180;
}
function calculateDistance($lat1,$lon1,$ele1,$lat2,$lon2,$ele2)
{
//Distance in meters
$dLat = toRadians((float) $lat2 - (float) $lat1);
$dLng = toRadians((float) $lon2 - (float) $lon1);
$a = (float) ( sin($dLat / 2) * sin($dLat / 2)) + (float) ( cos( toRadians($lat1)) * cos( toRadians($lat2)) * sin($dLng / 2) * sin($dLng / 2) );
$dist = 2 * 3958.75 * atan2(sqrt($a), sqrt(1 - (float) $a));
return sqrt(pow($dist * 1609.00, 2) + pow((float) $lat1 - (float)$lat2, 2));
}
?>