$_layout
$_layout : \PHPExcel_Chart_Layout
PlotArea Layout
PHPExcel_Chart_PlotArea
$_layout : \PHPExcel_Chart_Layout
PlotArea Layout
__construct(\PHPExcel_Chart_Layout $layout = null, $plotSeries = array())
Create a new PHPExcel_Chart_PlotArea
| \PHPExcel_Chart_Layout | $layout | |
| $plotSeries | 
getLayout() : \PHPExcel_Chart_Layout
Get Layout
getPlotGroupByIndex(  $index) : \PHPExcel_Chart_DataSeries
                Get Plot Series by Index
| $index | 
setPlotSeries(  $plotSeries = array()) : \PHPExcel_Chart_PlotArea
                Set Plot Series
| $plotSeries | 
refresh(\PHPExcel_Worksheet  $worksheet) 
                
| \PHPExcel_Worksheet | $worksheet |