OxyPlot Extension Methods

OxyPlotExtensions.cs

public static class OxyPlotExtensions
{
   public static void AddScatterSeries(this PlotModel model, IEnumerable<double> xSeries, IEnumerable<double> ySeries)
   {
       model.AddScatterSeries(xSeries, ySeries, OxyColors.Automatic);
   }

   public static void AddScatterSeries(this PlotModel model, IEnumerable<double> xSeries, IEnumerable<double> ySeries, OxyColor color)
   {
       var scatterSeries = new ScatterSeries()
       {
           MarkerFill = color,
           MarkerSize = 1,
       };

       foreach (var item in xSeries.Zip(ySeries, (x, y) => new { x, y }))
       {
           scatterSeries.Points.Add(new ScatterPoint(item.x, item.y));
       }

       model.Series.Add(scatterSeries);
   }

   public static void AddHighlightedPoint(this PlotModel model, double x, double y)
   {
       model.AddHighlightedPoint(x, y, OxyColors.Automatic);
   }

   public static void AddHighlightedPoint(this PlotModel model, double x, double y, OxyColor color)
   {
       var scatterSeries = new ScatterSeries()
       {
           MarkerFill = color,
           MarkerType = MarkerType.Triangle,
           MarkerSize = 5,
       };

       scatterSeries.Points.Add(new ScatterPoint(x, y));

       model.Series.Add(scatterSeries);
   }

   public static void AddLineSeries(this PlotModel model, IEnumerable<double> xSeries, IEnumerable<double> ySeries)
   {
       model.AddLineSeries(xSeries, ySeries, OxyColors.Automatic);
   }
   
   public static void AddLineSeries(this PlotModel model, IEnumerable<DateTime> xSeries, IEnumerable<double> ySeries)
   {
       model.AddLineSeries(xSeries, ySeries, OxyColors.Automatic);
   }

   public static void AddLineSeries(this PlotModel model, IEnumerable<DateTime> xSeries, IEnumerable<double> ySeries, OxyColor color)
   {
       model.Axes.Add(new DateTimeAxis());
       model.AddLineSeries(xSeries.Select(x => DateTimeAxis.ToDouble(x)), ySeries);
   }
   
   public static void AddLineSeries(this PlotModel model, IEnumerable<double> xSeries, IEnumerable<double> ySeries, OxyColor color)
   {
       var lineSeries = new LineSeries();

       foreach (var item in xSeries.Zip(ySeries, (x, y) => new { x, y }))
       {
           lineSeries.Points.Add(new DataPoint(item.x, item.y));
       }

       model.Series.Add(lineSeries);
   }   

   public static void AddColumnSeries(this PlotModel model, IEnumerable<string> xLabels, IEnumerable<double> ySeries)
   {
       model.AddColumnSeries(xLabels, ySeries, OxyColors.Automatic);
   }

   public static void AddColumnSeries(this PlotModel model, IEnumerable<string> xLabels, IEnumerable<double> ySeries, OxyColor color)
   {
       var axis = new CategoryAxis() { Position = AxisPosition.Bottom };
       axis.Labels.AddRange(xLabels);
       model.Axes.Add(axis);

       var columnSeries = new ColumnSeries()
       {
           FillColor = color,
       };

       columnSeries.Items.AddRange(ySeries.Select(y => new ColumnItem(y)));

       model.Series.Add(columnSeries);
   }
}

Converted to a project at https://github.com/a-h/oxyplot-extensions