throw new IllegalArgumentException("Chart must be instance of XSSFChart");
}
XSSFChart xssfChart = (XSSFChart) chart;
CTPlotArea plotArea = xssfChart.getCTChart().getPlotArea();
CTLineChart lineChart = plotArea.addNewLineChart();
lineChart.addNewVaryColors().setVal(false);
for (Series s : series) {
s.addToChart(lineChart);
}
for (ChartAxis ax : axis) {
lineChart.addNewAxId().setVal(ax.getId());
}
}