ScottPlot.NET
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Triangular Axis Styling

Triangular axis background and grid lines may be customized.

ScottPlot.Plot myPlot = new();

var ta = myPlot.Add.TriangularAxis();

// Customize the background
ta.FillStyle.Color = Colors.Blue.WithAlpha(.1);

// Customize the grid lines
ta.GridLineStyle.Color = Colors.Black.WithAlpha(.5);
ta.GridLineStyle.Pattern = LinePattern.Dotted;

// Add sample data
Coordinates[] points = [
    ta.GetCoordinates(0.50, 0.40),
    ta.GetCoordinates(0.60, 0.40),
    ta.GetCoordinates(0.65, 0.50),
];
myPlot.Add.Markers(points, MarkerShape.FilledCircle, 10, Colors.Red);

myPlot.SavePng("demo.png", 400, 300);
This recipe is one of many in the Triangular Axis category