Sulu\Bundle\MediaBundle\Media\ImageConverter\Focus\Focus::focus PHP Method

    public function focus(ImageInterface $image, $x, $y, $width, $height)
    {
        $imageSize = $image->getSize();
        $currentRatio = $imageSize->getWidth() / $imageSize->getHeight();
        $targetRatio = $currentRatio;
        if ($width !== null && $height !== null) {
            $targetRatio = $width / $height;
        }
        if ($targetRatio < $currentRatio) {
            $height = $imageSize->getHeight();
            $width = $targetRatio * $height;
            $cropY = 0;
            switch ($x) {
                case static::FOCUS_LEFT:
                    $cropX = 0;
                    break;
                case static::FOCUS_RIGHT:
                    $cropX = $imageSize->getWidth() - $width;
                    break;
                default:
                    $cropX = ($imageSize->getWidth() - $width) / 2;
            }
        } else {
            $width = $imageSize->getWidth();
            $height = $width / $targetRatio;
            $cropX = 0;
            switch ($y) {
                case static::FOCUS_TOP:
                    $cropY = 0;
                    break;
                case static::FOCUS_BOTTOM:
                    $cropY = $imageSize->getHeight() - $height;
                    break;
                default:
                    $cropY = ($imageSize->getHeight() - $height) / 2;
            }
        }
        return $image->crop(new Point($cropX, $cropY), new Box($width, $height));
    }