protected function setAttributes(DOMNode $from, DOMNode $to, array $options) {
		$width = isset($options['width']) ? (int)$options['width'] : 0;
		$height = isset($options['height']) ? (int)$options['height'] : 0;
		$class = isset($options['class']) ? (string)$options['class'] : '';

		$classes = explode(' ', $class . ' ' . $from->getAttribute('class'));
		$classes = array_map('trim', $classes);
		$classes = array_filter($classes);
		$classes = array_unique($classes);
		$to->setAttribute('class', implode(' ', $classes));

		if ($width || $from->hasAttribute('width')) {
			$to->setAttribute('width', $width ?: $from->getAttribute('width'));
		}
		if ($height || $from->hasAttribute('height')) {
			$to->setAttribute('height', $height ?: $from->getAttribute('height'));
		}
		if ($from->hasAttribute('viewBox')) {
			$to->setAttribute('viewBox', $from->getAttribute('viewBox'));
		}
		if ($from->hasAttribute('preserveAspectRatio')) {
			$to->setAttribute('preserveAspectRatio', $from->getAttribute('preserveAspectRatio'));
		}
	}