function getLineEnds($x1, $y1, $x2, $y2)
{
$offset = 20;
$angle = getAngle($x1, $y1, $x2, $y2);
$c1x = (int) ($x1 + $offset * cos($angle));
$c1y = (int) ($y1 + $offset * sin($angle));
$c2x = (int) ($x2 - $offset * cos($angle));
$c2y = (int) ($y2 - $offset * sin($angle));
return array($c1x, $c1y, $c2x, $c2y);
}
function optimizePoly(array $_poly)
{
$curangle = getAngle($_poly[0], $_poly[1]);
$ret = array($_poly[0]);
for ($i = 1, $l = count($_poly) - 1; $i < $l; ++$i) {
$angle = getAngle($_poly[$i], $_poly[$i + 1]);
if ($angle != $curangle) {
$curangle = $angle;
$ret[] = $_poly[$i];
}
}
$ret[] = $_poly[$i];
return $ret;
}
break;
}
}
}
// preskoči avione koji nisu u okviru prozora
if ($lat < $latMin || $lat > $latMax || $lon < $lonMin || $lon > $lonMax) {
continue;
}
$node = $dom->createElement("airplane");
$airplaneNode = $parnode->appendChild($node);
$airplaneNode->setAttribute("id", $row['OID']);
$airplaneNode->setAttribute("start_time", $start_time);
$airplaneNode->setAttribute("end_time", $row['end_time']);
$airplaneNode->setAttribute("lat", $lat);
$airplaneNode->setAttribute("lon", $lon);
$airplaneNode->setAttribute("alt", $alt);
$airplaneNode->setAttribute("point_name", $point_name);
$angle = getAngle($lat1ForAngle, $lon1ForAngle, $lat, $lon);
$airplaneNode->setAttribute("angle", $angle);
$planesCounter++;
if ($planesCounter == $maxFlights) {
break;
}
}
// upis u XML
echo $dom->saveXML();
function getAngle($lat1, $lon1, $lat2, $lon2)
{
$angle = atan2($lon2 - $lon1, $lat2 - $lat1);
return rad2deg($angle);
}