Incoherent result for 3 points

[chandon]

I'm trying to compute with 3 points, i got incoherent result (with empty area and overlaping areas...)

I tried it with gorhill/Javascript-Voronoi, the result is OK

I tried to compare gorhill/Javascript-Voronoi vs this library (and implemented some fixes, like fully rewriting closeCells), but i don't see any real difference between the 2 libraries that explain the problem

    $voronoi=new \sroze\voronoi\Nurbs\Voronoi();

    $bbox = new \stdClass();
    $bbox->xl = 0;
    $bbox->xr = 360;
    $bbox->yt = 0;
    $bbox->yb = 360;

    $sitesList=[
        new \sroze\voronoi\Nurbs\Point(230.8672211,94.3521468),
        new \sroze\voronoi\Nurbs\Point(230.793264,94.310584),
        new \sroze\voronoi\Nurbs\Point(221.84149120083,102.55202538466)
    ];
        
    $diagram = $voronoi->compute($sitesList, $bbox);

    // TEMPORARY
    // Create image using GD
    $im = imagecreatetruecolor(360, 360);

    // Create colors
    $white = imagecolorallocate($im, 255, 255, 255);
    $red = imagecolorallocate($im, 255, 0, 0);
    $green = imagecolorallocate($im, 0, 100, 0);
    $black = imagecolorallocate($im, 0, 0, 0);

    // Fill white background
    imagefill($im, 0, 0, $white);
     
    // Draw points
    for ($i=0; $i < count($sitesList); $i++) {
        $point = $sitesList[$i];
          imagerectangle($im, $point->x - 2, $point->y - 2, $point->x + 2, $point->y + 2, $black);
    }

    // Draw polygons
    $j = 0;
    foreach ($diagram['cells'] as $cell) {
        {
        $points = array();
     
        if (count($cell->_halfedges) > 0) {
            $v = $cell->_halfedges[0]->getStartPoint();
            if ($v) {
                $points[] = $v->x;
                $points[] = $v->y;
            } else {
                var_dump($j.': no start point');
            }
     
            for ($i = 0; $i < count($cell->_halfedges); $i++) {
                $halfedge = $cell->_halfedges[$i];
                $edge = $halfedge->edge;
     
                if ($edge->va && $edge->vb) {
                    imageline($im, $edge->va->x, $edge->va->y, $edge->vb->x, $edge->vb->y, $red);
                }
     
                $v = $halfedge->getEndPoint();
                if ($v) {
                    $points[] = $v->x;
                    $points[] = $v->y;
                }
            }
        }
     
        // Create polygon with a random color
        $color = imagecolorallocatealpha($im, rand(0, 255), rand(0, 255), rand(0, 255), 50);
        imagefilledpolygon($im, $points, count($points) / 2, $color);
    }
        $j++;
    }
     
    // Display image
    header('Content-Type: image/png');
    imagepng($im);
    die;