Script to help setup Oxyplot for use in C# Scripts (.csx) using dotnet-script

plot.csx

#r "nuget: OxyPlot.Core.Drawing, 2.0.0"
using OxyPlot;
using OxyPlot.Axes;
using OxyPlot.Core.Drawing;
using OxyPlot.Series;

/* export functions */
static PlotModel ExportToPng(this PlotModel plot, string file, int width = 1024, int height = 768)
{
  PngExporter.Export(plot, file, width, height, OxyColors.White);
  return plot;
} 

static PlotModel ExportToSvg(this PlotModel plot, string file, double width = 1024, double height = 768)
{
  using (var fs = File.Create(file))
     SvgExporter.Export(plot, fs, width, height, true);
  return plot;
}

enum ImageType { Png, Svg };

static PlotModel Export(this PlotModel plot, string file, ImageType imageType, int width = 1024, int height = 768)
  => imageType switch
  {
    ImageType.Png => plot.ExportToPng(file, width, height),
    ImageType.Svg => plot.ExportToSvg(file, width, height),
    _ => throw new ArgumentOutOfRangeException(nameof(imageType)),
  };

/* PlotModel extensions */
static PlotModel AddSeries(this PlotModel plotModel, Series series)
{
  plotModel.Series.Add(series);
  return plotModel;
}

static PlotModel GetPlot()
  => new PlotModel { };

/* helper for FunctionSeries */
static FunctionSeries GetSeries(Func<double, double> f, double start, double end, double step, string title = null)
  => new FunctionSeries(f, x0: start, x1: end, dx: step, title: title);

static Func<Func<double, double>, string, FunctionSeries> GetSeries(double start, double end, double step)
  => (Func<double, double> f, string title) => GetSeries(f, start, end, step, title);

/* helper for HistogramSeries */
private static HistogramSeries GetHistogramSeries()
  => new HistogramSeries { StrokeThickness = 1 };

static HistogramSeries AddItem(this HistogramSeries series, HistogramItem item)
{
  series.Items.Add(item);
  return series;
}

static HistogramSeries AddItems(this HistogramSeries series, IEnumerable<HistogramItem> items)
{
  foreach (var item in items)
    series.AddItem(item);
  return series;
}

static HistogramSeries GetSeries(this IEnumerable<HistogramItem> items, Func<HistogramSeries> getHistogram = null)
  => (getHistogram switch
     { 
       null => GetHistogramSeries(),
       Func<HistogramSeries> f => f(),
     }).AddItems(items);

static HistogramItem GetHistogramItem(double start, double end, int count)
  => new HistogramItem(start, end, Math.Abs(end-start) * count, count);

static HistogramItem GetHistogramItem(IGrouping<double, int> group, double groupRange, int groupCount)
  => GetHistogramItem(group.Key * groupRange, (group.Key+1) * groupRange, group.Count());

static IEnumerable<HistogramItem> GetHistogramItems(this IEnumerable<IGrouping<double, int>> groups, double groupRange)
  => groups.Select(g => GetHistogramItem(g, groupRange, groups.Count()));

static HistogramSeries GetSeries(this IEnumerable<IGrouping<double, int>> groupings, double groupRange)
  => groupings.GetHistogramItems(groupRange).GetSeries();