using OxyPlot;
using OxyPlot.Series;
using OxyPlot.ImageSharp;

PlotModel normalModel = new PlotModel
{
    TitleFontWeight = FontWeights.Normal,
    Background = OxyColors.White,
    Series = {
        new PieSeries
        {
            InsideLabelFormat = "{1}",
            OutsideLabelFormat = "{1} {2:0}%",
            FontWeight = FontWeights.Normal,
            Slices =
            {
                new PieSlice("A", 10),
                new PieSlice("B", 20),
                new PieSlice("C", 30),
                new PieSlice("D", 40),
            }
        },
    },
};

PlotModel boldModel = new PlotModel
{
    TitleFontWeight = FontWeights.Bold,
    Background = OxyColors.White,
    Series = {
        new PieSeries
        {
            InsideLabelFormat = "{1}",
            OutsideLabelFormat = "{1} {2:0}%",
            FontWeight = FontWeights.Bold,
            Slices =
            {
                new PieSlice("A", 10),
                new PieSlice("B", 20),
                new PieSlice("C", 30),
                new PieSlice("D", 40),
            }
        },
    }
};


PngExporter.Export(normalModel, "normal.png", 600, 400);
PngExporter.Export(boldModel, "bold.png", 600, 400);