<?php

class PolyFormat implements Format {

public $title = 'poly';

public $priority = -9;

public function export( $data ) {

$title = isset($data['title']) && strlen(trim($data['title'])) > 0 ? trim($data['title']) : 'shared';

$poly = "$title\n";

$section = 1;

$inner = ''; // 0 - outer, 1 - inner

foreach( $data['objs'] as $obj ) {

$coords = $obj['coords'];

if( count($coords) > 2 && $coords[0] == $coords[count($coords)-1] ) {

$ring = ($section++)."\n";

foreach( $coords as $c )

$ring .= sprintf(" %E %E\n", $c[1], $c[0]);

$ring .= "END\n";

if( isset($obj['params']) && in_array('green', $obj['params']) ) // yes, green. That's a plug

$inner .= $ring;

else

$poly .= $ring;

}

}

return $poly.$inner."END\n";

}

public function test( $header ) {

return preg_match('/^[^\n\r]+?[\r\n]+!?\d+[\r\n]\s*-?\d/s', $header); // very loose, yes

}

public function import( $file ) {

$title = fgets($file, 200);

$objs = array();

$section = fgets($file, 100);

while( $section !== false && strlen($section) > 0 && $section !== 'END' ) {

$coords = array();

while( ($line = fgets($file, 100)) !== false ) {

if( $line == 'END' )

break;

if( preg_match('/^\s*(\S+)\s+(\S+)/', $line, $m) )

if( is_numeric($m[1]) && is_numeric($m[2]) )

$coords[] = array((float)$m[2], (float)$m[1]);

}

$params = substr($section, 0, 1) == '!' ? array('green') : array();

if( count($coords) > 2 ) {

$last = $coords[count($coords)-1];

if( $coords[1] == $last )

array_shift($coords);

elseif( $coords[0] != $last )

$coords[] = $coords[0];

$objs[] = array('coords' => $coords, 'params' => $params);

}

$section = fgets($file, 100);

}

return count($objs) > 0 ? array('title' => $title, 'objs' => $objs) : false;

}

}

$formats['poly'] = new PolyFormat();

?>