Example

function clear()
{
    $draw = new \ImagickDraw();

    $strokeColor = new \ImagickPixel('black');
    $fillColor = new \ImagickPixel();
    $fillColor->setColor('rgba(100%, 75%, 0%, 1.0)');

    $fillColor->clear();

    $draw->setstrokewidth(3.0);
    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);
    $draw->rectangle(200, 200, 300, 300);

    $image = new \Imagick();
    $image->newImage(500, 500, "SteelBlue2");
    $image->setImageFormat("png");

    $image->drawImage($draw);

    header("Content-Type: image/png");
    echo $image->getImageBlob();
}