97 lines
2.5 KiB
PHP
97 lines
2.5 KiB
PHP
<?php
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function getPoints($gpxPath,$gpxOffset = 10)
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{
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$points = array();
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$dist=0;
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$lastLat=0;
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$lastLon=0;
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$lastEle=0;
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$lastOffset=0;
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//Default Offset = 10 mt
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if (!($gpxOffset > 0))
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{
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$gpxOffset = 10;
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}
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$realGpxPath = substr (__FILE__, 0, strrpos(__FILE__,'/wp-content/')).$gpxPath;
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if (file_exists($realGpxPath))
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{
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$gpx = simplexml_load_file($realGpxPath);
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$gpx->registerXPathNamespace('10', 'http://www.topografix.com/GPX/1/0');
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$gpx->registerXPathNamespace('11', 'http://www.topografix.com/GPX/1/1');
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foreach($gpx->xpath('//trkpt | //10:trkpt | //11:trkpt') as $trkpt){
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$lat = $trkpt['lat'];
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$lon = $trkpt['lon'];
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$ele = $trkpt->ele;
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if ($lastLat == 0 && $lastLon == 0)
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{
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//Base Case
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array_push($points, array((float)$lat,(float)$lon,(float)round($ele,1),(float)round($dist,1)));
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$lastLat=$lat;
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$lastLon=$lon;
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$lastEle=$ele;
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}
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else
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{
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//Normal Case
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$offset = calculateDistance($lat, $lon, $ele,$lastLat, $lastLon, $lastEle);
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$dist = $dist + $offset;
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if (((float) $offset + (float) $lastOffset) > $gpxOffset)
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{
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//Bigger Offset -> write coordinate
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$lastOffset=0;
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array_push($points, array((float)$lat,(float)$lon,(float)round($ele,1),(float)round($dist,1)));
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}
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else
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{
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//Smoller Offset -> continue..
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$lastOffset= (float) $lastOffset + (float) $offset ;
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}
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}
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$lastLat=$lat;
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$lastLon=$lon;
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$lastEle=$ele;
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}
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}
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else
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{
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array_push($points, array((float)0,(float)0,(float)0,(float)0));
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}
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// riduco l'array a circa 200 punti per non appensantire la pagina(mappa e grafico)!
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$count=sizeof($points);
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if ($count>200)
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{
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$f = round($count/200);
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if ($f>1)
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for($i=$count;$i>0;$i--)
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if ($i % $f != 0)
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unset($points[$i]);
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}
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return $points;
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}
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function toRadians($degrees)
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{
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return $degrees * 3.1415926535897932385 / 180;
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}
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function calculateDistance($lat1,$lon1,$ele1,$lat2,$lon2,$ele2)
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{
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//Distance in meters
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$dLat = toRadians((float) $lat2 - (float) $lat1);
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$dLng = toRadians((float) $lon2 - (float) $lon1);
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$a = (float) ( sin($dLat / 2) * sin($dLat / 2)) + (float) ( cos( toRadians($lat1)) * cos( toRadians($lat2)) * sin($dLng / 2) * sin($dLng / 2) );
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$dist = 2 * 3958.75 * atan2(sqrt($a), sqrt(1 - (float) $a));
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return sqrt(pow($dist * 1609.00, 2) + pow((float) $lat1 - (float)$lat2, 2));
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}
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?>
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