Elliptical Arc

An elliptical arc is a curve along the partial circumference of an ellipse. The ellipse starts at the far right and extends counter-clockwise.

Shapes.cs

ScottPlot.Plot myPlot = new();

Coordinates center = new(0, 0);
double radiusX = 2.0;
double radiusY = 1.0;
Angle start = Angle.FromDegrees(45);
Angle sweep = Angle.FromDegrees(135);

var ellipse = myPlot.Add.Ellipse(center, radiusX, radiusY);
ellipse.FillColor = Colors.Blue.WithAlpha(.2);
ellipse.LineWidth = 0;

var arc = myPlot.Add.EllipticalArc(center, radiusX, radiusY, start, sweep);
arc.LineWidth = 5;
arc.LineColor = Colors.Black;

myPlot.Axes.SquareUnits(); // use square units so circles are not stretched

myPlot.SavePng("demo.png", 400, 300);

Edit on GitHub

This recipe is one of many in the Shapes category