/**
* Sets legend options within the jsWriter.
* To show or hide the legend, invoke the following method:
* <code>
* // default value for first parameter will show the legend
* $chart->setLegend();
* // this value will explicitly hide the legend
* $chart->setLegend( array( 'on' => false ) );
* // this value will explicitly show the legend, and override the default orientation (ne)
* $chart->setLegend( array( 'on' => true, 'location' => 'sw' ) );
* </code>
* $chart->setLegend() encapsulates $chart->jsWriter->setLegend(), passing the values on.
* Only a jsWriter that implements \Altamira\JsWriter\Ability\Legendable will have that method available.
* @param array $opts
* @return \Altamira\Chart provides fluent interface
*/
public function setLegend(array $opts = array('on' => 'true', 'location' => 'ne', 'x' => 0, 'y' => 0))
{
$this->jsWriter->setLegend($opts);
return $this;
}
