Put play icon over a thumbnail


function create_play_jpeg($parts) {
    chdir($parts["dirname"]);
    $d = $parts["filename"];

    $img = new Imagick();
    $img->readImage($parts["filename"].".jpg");

    $h = $img->getImageHeight();
    $w = $img->getImageWidth();

    $cx = $w/2;
    $cy = $h/2;
    if ($h>$w) {
        $s = (int)($w*0.3);
    } else {
        $s = (int)($h*0.3);
    }
    $draw = new ImagickDraw();
    $draw->setStrokeColor('black');
    $draw->setStrokeOpacity(0.5);
    $draw->setStrokeWidth((int)($s/10));
    $draw->setFillColor('white');
    $draw->setFillOpacity(0.5);
    $draw->polygon(array(
        array("x"=>$cx-$s,"y"=>$cy-$s),
        array("x"=>$cx+$s,"y"=>$cy),
        array("x"=>$cx-$s,"y"=>$cy+$s),
        array("x"=>$cx-$s,"y"=>$cy-$s)
    ));
    $img->drawImage($draw);
    $img->setImageFileName($d."_play.jpg");
    $img->writeImage();
}