Example

function setGravity($fillColor, $strokeColor, $backgroundColor)
{
    $draw = new \ImagickDraw();
    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);
    $draw->setStrokeWidth(1);
    $draw->setFontSize(24);

    $gravitySettings = array(\Imagick::GRAVITY_NORTHWEST => 'NorthWest', \Imagick::GRAVITY_NORTH => 'North', \Imagick::GRAVITY_NORTHEAST => 'NorthEast', \Imagick::GRAVITY_WEST => 'West', \Imagick::GRAVITY_CENTER => 'Centre', \Imagick::GRAVITY_SOUTHWEST => 'SouthWest', \Imagick::GRAVITY_SOUTH => 'South', \Imagick::GRAVITY_SOUTHEAST => 'SouthEast', \Imagick::GRAVITY_EAST => 'East');

    $draw->setFont("../fonts/Arial.ttf");

    foreach ($gravitySettings as $type => $description) {
        $draw->setGravity($type);
        $draw->annotation(50, 50, '"' . $description . '"');
    }

    $imagick = new \Imagick();
    $imagick->newImage(500, 500, $backgroundColor);
    $imagick->setImageFormat("png");
    $imagick->drawImage($draw);

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