PieChartDataSet dataset = new PieChartDataSet(title, data, legendLabels, poleBarev, properties);
LegendProperties legend = new LegendProperties();
legend.setNumColumns(1);
ChartProperties chartProperties = new ChartProperties();
chartProperties.setUseAntiAliasing(true);
PieChart2D chart = new PieChart2D(dataset, legend, chartProperties, width, height);
PNGEncoder.encode(chart, new FileOutputStream(file));
}