/**
* The background color for the main area of the chart. Can be either a simple
* HTML color string, for example: 'red' or '#00cc00', or a backgroundColor object
*
* @param $backgroundColor backgroundColor
* @return \Chart
*/
public function backgroundColor($backgroundColor)
{
if (Helpers::is_backgroundColor($backgroundColor)) {
$this->addOption($backgroundColor->toArray());
} else {
$this->type_error(__FUNCTION__, 'backgroundColor');
}
return $this;
}
