append point to linstring

[stefanocudini]

hi

how can I append new point at end of gpx track?

$newPoint = geoPHP::load('POINT(12.23 45.2)','wkt');

$trackFile = 'mytrack.gpx';

$track = geoPHP::load(file_get_contents($trackFile),'gpx');

...???append point???...

file_put_contents($trackFile, $out);

[mprins]

you would probably nee to get the last point of your track, use that and newPoint to build a line and then use [union()] to join the two lines (https://github.com/phayes/geoPHP/blob/master/lib/geometry/Geometry.class.php#L222) (requires geos) and assuming your track exists of only one segment

the other option is to serialize to string, append the point to the string and deserialize from string

[stefanocudini]

Thank you for answer. I'm resolved in this way:

    $trackFile = 'track.gpx';
    $loc = array(42.34,13.23);  //new POINT
    $locGeo = geoPHP::load('POINT('.implode(' ',$loc).')','wkt');

    $track = geoPHP::load(file_get_contents($trackFile),'gpx');

    $trackAr =  $track->asArray();

    if( $locGeo->equals($track->endPoint()) )
        die('this last point just exists');
    else
        $trackAr[]= $loc;

    $trackOut = array();
    foreach($trackAr as $v)
        $trackOut[]= new Point($v[0],$v[1]);

    $trackOut = new LineString($trackOut);

    $out = $trackOut->out('gpx');

    file_put_contents($trackFile, $out);

[stefanocudini]

maybe a new method: addPoint inside LineString class could be useful