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<?php
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// $Id: gmap_gpx.inc,v 1.1.2.2 2007/08/28 21:06:30 bdragon Exp $
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/*
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* Created on 11.04.2007
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* parse gpx files so we can show tracks on the map
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*/
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function gmap_gpx_parse_file($gpxfile) {
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if (!file_exists($gpxfile)) return false;
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$fp = @fopen($gpxfile, "r");
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if (!$fp) return false;
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$data = fgets($fp, 8192);
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while (!feof($fp)) {
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$data .= fgets($fp, 8192);
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}
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fclose($fp);
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return gmap_gpx_parse($data);
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}
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function gmap_gpx_parse(&$data) {
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global $gmap_gpx;
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$parser = drupal_xml_parser_create($data);
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xml_set_element_handler($parser, '_gmap_gpx_start_element', '_gmap_gpx_stop_element');
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xml_set_character_data_handler($parser, '_gmap_gpx_char_data');
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$gmap_gpx = array(
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'char_data' => NULL,
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'stack' => array(),
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);
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xml_parse($parser, $data, true); //$buf, feof($fp));
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xml_parser_free($parser);
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//_gmap_gpx_write_csv_file();
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unset($gmap_gpx['stack']);
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}
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function gmap_gpx_cleanup() {
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global $gmap_gpx;
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$gmap_gpx = null;
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}
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function gmap_gpx_data2map(&$map) {
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global $gmap_gpx;
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$c = is_array($gmap_gpx['wpt']) ? count($gmap_gpx['wpt']) : 0;
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for ($i = 0; $i <= $c; $i++) {
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$wp =& $gmap_gpx['wpt'][$i];
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$m = array('latitude' => $wp['lat'], 'longitude' => $wp['lon']);
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if ($wp['name']) $m['opts']['title'] = $wp['name'];
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$map['markers'][] = $m;
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// TODO: select icon from $wp['sym'] and $wp['type']
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}
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// 0..n routes with 0..x points each
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if (isset($gmap_gpx['rte']) && is_array($gmap_gpx['rte'])) {
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$c = count($gmap_gpx['rte']); // number of routes
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for ($i = 0; $i < $c; $i++) {
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_gmap_gpx_add_wp_poly($map, $gmap_gpx['rte'][$i]['points']);
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}
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}
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// 0..n tracks with 1..m segments
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if (isset($gmap_gpx['trk']) && is_array($gmap_gpx['trk'])) {
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$c = count($gmap_gpx['trk']); // number of tracks
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for ($i = 0; $i < $c; $i++) {
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$segs =& $gmap_gpx['trk'][$i]['segs'];
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$c2 = count($segs); // number of segments in track
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for ($j = 0; $j < $c2; $j++) {
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_gmap_gpx_add_wp_poly($map, $segs[$j]['points']);
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}
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}
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}
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// TODO: make sure we don't screw up around 180 degrees
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if ($gmap_gpx['bounds']) {
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$lat = ($gmap_gpx['bounds']['minlat'] + $gmap_gpx['bounds']['maxlat']) / 2;
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$lon = ($gmap_gpx['bounds']['minlon'] + $gmap_gpx['bounds']['maxlon']) / 2;
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$map['latlong'] = $lat .','. $lon;
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}
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}
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function _gmap_gpx_add_wp_poly(&$map, &$wpa) {
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$c = count($wpa);
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$s = array('type' => 'polygon', 'points' => array());
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for ($i = 0; $i < $c; $i++) {
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$wp = $wpa[$i];
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$s['points'][] = array('latitude' => $wp['lat'], 'longitude' => $wp['lon']);
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}
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//$s['style'] = array('#0000ff', 3, 1);
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$map['shapes'][] = $s;
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}
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function _gmap_gpx_start_element(&$parser, $name, $attrs) {
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global $gmap_gpx;
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static $wpa = array('GPX WPT' => 1, 'GPX RTE RTEPT' => 1,
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'GPX TRK TRKSEG TRKPT' => 1);
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$path = join(' ', $gmap_gpx['stack']) .' '. $name;
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//if (($path == 'GPX WPT') || ($path == 'GPX RTE RTEPT') || ($path == 'GPX TRK TRKSEG TRKPT')) {
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if (isset ($wpa[$path])) {
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$gmap_gpx['waypoint'] = array(
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'lat' => $attrs['LAT'],
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'lon' => $attrs['LON'],
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//'lat_pretty' => _gmap_gpx_latlon_pretty($attrs['LAT'], 'N', 'S'),
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//'lon_pretty' => _gmap_gpx_latlon_pretty($attrs['LON'], 'E', 'W', true),
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);
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$gmap_gpx['point_type'] = strtolower($name); // 'wpt' || 'rtept' || 'trkpt'
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}
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elseif (isset($gmap_gpx['waypoint']) && ($name == 'EXTENSIONS')) {
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$gmap_gpx['in_extension'] = true;
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}
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elseif ($name == 'BOUNDS') {
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foreach ($attrs as $key => $val) {
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$gmap_gpx['bounds'][strtolower($key)] = $val;
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}
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}
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$gmap_gpx['char_data'] = '';
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$gmap_gpx['stack'][] = $name;
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}
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function _gmap_gpx_stop_element(&$parser, $name) {
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global $gmap_gpx;
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static $info_tags = array('NAME' => 1 , 'DESC' => 1, 'CMT' => 1,
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'URL' => 1, 'URLNAME' => 1, 'TIME' => 1);
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static $wpa = array('GPX WPT' => 1, 'GPX RTE RTEPT' => 1,
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'GPX TRK TRKSEG TRKPT' => 1);
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$path = join(' ', $gmap_gpx['stack']);
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array_pop($gmap_gpx['stack']); // remove $name from stack
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$point_type = $gmap_gpx['point_type'];
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if (isset($wpa[$path])) { // closing tag of one point
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$gmap_gpx[$point_type]['points'][] = $gmap_gpx['waypoint'];
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unset($gmap_gpx['waypoint']);
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unset($gmap_gpx['point_type']);
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}
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elseif (isset($gmap_gpx['waypoint'])) { // more info for a point
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if ($gmap_gpx['in_extension']) {
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if ($name == 'EXTENSIONS') unset($gmap_gpx['in_extension']);
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return;
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}
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if ($name == 'TIME') {
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$gmap_gpx['waypoint']['time'] = strtotime($gmap_gpx['char_data']);
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}
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else {
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$gmap_gpx['waypoint'][strtolower($name)] = $gmap_gpx['char_data'];
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}
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}
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elseif ($path == 'GPX RTE') { // end of a route
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$gmap_gpx['rte'][] = $gmap_gpx['rtept'];
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unset($gmap_gpx['rtept']);
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}
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elseif ($path == 'GPX TRK TRKSEG') { // end of a track segment
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$gmap_gpx['cur_trk']['segs'][] = $gmap_gpx['trkpt'];
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unset($gmap_gpx['trkpt']);
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}
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elseif ($path == 'GPX TRK') { // end of a track
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$gmap_gpx['trk'][] = $gmap_gpx['cur_trk'];
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unset($gmap_gpx['cur_trk']);
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}
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elseif (isset($info_tags[$name])) { // more info for track, route or whole file
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$nl = strtolower($name);
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$v = ($name == 'time') ? strtotime($gmap_gpx['char_data']) : $gmap_gpx['char_data'];
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switch ($gmap_gpx['stack'][1]) {
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case 'RTE':
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$gmap_gpx['rtept']['info'][$nl] = $v;
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break;
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case 'TRK':
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$gmap_gpx['cur_trk']['info'][$nl] = $v;
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break;
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default:
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$gmap_gpx['info'][$nl] = $v;
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}
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}
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unset($gmap_gpx['char_data']);
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}
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function _gmap_gpx_char_data(&$parser, $data) {
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global $gmap_gpx;
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$gmap_gpx['char_data'] .= $data;
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}
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function _gmap_gpx_latlon_pretty($deg, $pos, $neg, $three = false) {
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if ($deg > 0) {
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$str = $pos;
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}
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else {
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$str = $neg;
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$deg = - $deg;
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}
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$d = $deg;
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settype($d, 'integer');
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$deg -= $d;
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if ($three && $d < 100)
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$str .= '0';
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if ($d < 10)
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$str .= '0';
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$str .= $d .'°';
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$deg *= 60;
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$deg *= 1000;
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settype($deg, 'integer');
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$deg /= 1000;
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$str .= $deg ."'";
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return $str;
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}
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