/**
* Scales the image proportionally to a width
*
* @param int $width
*
* @throws \InvalidArgumentException
* @return void
*/
public function scaleToWidth($width)
{
if (!self::isValidImageDimension($width)) {
throw new \InvalidArgumentException('Width and Height must be integer > 0.');
}
$height = (int) round($width / $this->image->getWidth() * $this->image->getHeight());
$this->image->scaleToDimensions($width, $height);
}