using Cairo; // Create a new Cairo context using (var surface = new ImageSurface(Format.ARGB32, 100, 100)) using (var cr = new Context(surface)) { // Set the line width and color cr.LineWidth = 2.0; cr.SetSourceRGB(1, 0, 0); // Move to the starting point cr.MoveTo(10, 10); // Draw a line relative to the starting point cr.RelLineTo(20, 20); // Stroke the path cr.Stroke(); // Save the image to a file surface.WriteToPng("output.png"); }This example creates a new Cairo context, sets the line width and color, and then uses the RelLineTo method to draw a line from the starting point (10, 10) to a point that is 20 units to the right and 20 units down. The path is then stroked and the resulting image is saved to a file. The package library for Cairo Graphics in C# is `CairoSharp`.