function isPolySelfIntersect()
{
$intersect = FALSE;
$s = $this->getFirst();
// Get the first vertex in this polygon
$c = $s->Next();
// Get the next vertex
do {
do {
if ($this->ints($s, $s->Next(), $c, $c->Next(), $n, $x, $y, $aS, $aC)) {
// If the segments intersect
for ($i = 0; $i <= $n; $i++) {
// then for each intersection point
if (isset($aS[$i]) && $aS[$i] != 0 || isset($aC[$i]) && $aC[$i] != 0) {
// check that it NOT at the end of the segment
$intersect = TRUE;
}
}
}
// Because sequential segments always intersect at their ends
$c = $c->Next();
} while ($c->id() != $this->first->id());
$s = $s->Next();
} while ($s->id() != $this->first->id());
return $intersect;
}
