public function getRenderData( $useLabel = false )
    {
        $radius = ( $this->jsWriter instanceof \Altamira\JsWriter\Flot ) ? $this['radius'] * 10 : $this['radius']; 
        
        $data = array( $this['x'], $this['y'], $radius );
        
        if ( $useLabel ) {
            $data[] = $this['label'];
        }
        
        return $data;
    }