96 lines
2.5 KiB
PHP
96 lines
2.5 KiB
PHP
<?php
|
|
|
|
function getPoints($gpxPath,$gpxOffset = 10)
|
|
{
|
|
$points = array();
|
|
|
|
$dist=0;
|
|
|
|
$lastLat=0;
|
|
$lastLon=0;
|
|
$lastEle=0;
|
|
$lastOffset=0;
|
|
|
|
//Default Offset = 10 mt
|
|
if (!($gpxOffset > 0))
|
|
{
|
|
$gpxOffset = 10;
|
|
}
|
|
|
|
$realGpxPath = substr (__FILE__, 0, strrpos(__FILE__,'/wp-content/')).$gpxPath;
|
|
|
|
if (file_exists($realGpxPath))
|
|
{
|
|
|
|
$gpx = simplexml_load_file($realGpxPath);
|
|
$gpx->registerXPathNamespace('10', 'http://www.topografix.com/GPX/1/0');
|
|
$gpx->registerXPathNamespace('11', 'http://www.topografix.com/GPX/1/1');
|
|
|
|
foreach($gpx->xpath('//trkpt | //10:trkpt | //11:trkpt') 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
|
|
{
|
|
//Smoller Offset -> continue..
|
|
$lastOffset= (float) $lastOffset + (float) $offset ;
|
|
}
|
|
}
|
|
$lastLat=$lat;
|
|
$lastLon=$lon;
|
|
$lastEle=$ele;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
array_push($points, array((float)0,(float)0,(float)0,(float)0));
|
|
}
|
|
|
|
// riduco l'array a circa 200 punti per non appensantire la pagina(mappa e grafico)!
|
|
$count=sizeof($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 $points;
|
|
}
|
|
|
|
function toRadians($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));
|
|
}
|
|
|
|
?>
|