isPolyInside failing

Bit of an odd one but there seem to be some scenarios that cause isPolyInside to incorrectly identify another polygon that is inside it e.g.

// Polygon coordinates

$coordsA = array (
array (5,5), array (15,2),
array (15,10), array (5,10)
);
$coordsB = array (
array (9,5), array (11,5),
array (11,7), array (9,7)
);

// Create polygons

$pA = new polygon;
$pB = new polygon;

foreach ($coordsA as $coord)
{
$pA->addv ($coord[0], $coord[1]);
}

foreach ($coordsB as $coord)
{
$pB->addv ($coord[0], $coord[1]);
}

// Check whether B is inside A
// This should return TRUE but instead returns FALSE

var_dump ($pA->isPolyInside ($pB));

If i change $point_at_infinity in polygon->isInside() to be 10000000 vs -10000000 as it is originally then it works correctly, HOWEVER this causes failures in other scenario's that would normally work.

I'm not certain what the problem is as i haven't gone as far as understanding the maths behind it, but i can't seem to get it working correctly in all situations regardless of what i try

For the help of anyone else in the future i've debugged this and altering the polygon->ints method to re-calculate and check the intersection after the perturb method has been called seems to do the job in all scenario's that i've tested.

Hi Andy, I think I encountered similar problem. How do you go about changing the original ints function?