SVG export example

private static readonly XNamespace SvgNamespace = "http://www.w3.org/2000/svg";

[Pure]
private static string Svgify(double value)
{
    return value.ToString("0.##", CultureInfo.InvariantCulture);
}

[Pure]
private static XElement Tag(string name, params (string Name, string Value)[] attributes)
{
    return new XElement(SvgNamespace + name, ToXmlAttributes(attributes));
}

[Pure]
private static XElement Tag(string name, string content, params (string Name, string Value)[] attributes)
{
    return new XElement(SvgNamespace + name, content, ToXmlAttributes(attributes));
}

[Pure]
private static IEnumerable<XAttribute> ToXmlAttributes([NotNull] (string Name, string Value)[] attributes)
{
    return from attribute in attributes select new XAttribute(attribute.Name, attribute.Value);
}

[UsedForDebug]
internal static void SaveToSvg([NotNull] this Skeleton self, [NotNull] string path)
{
    ThrowIf.Argument.IsNull(self, nameof(self));
    ThrowIf.Argument.IsNull(path, nameof(path));

    var svg = Tag("svg", ("viewBox", "0 0 3000 3000"));

    foreach (var bone in self.Bones)
    {
        var points = new StringBuilder();

        foreach (var vertex in bone.Vertices)
        {
            points.Append($"{Svgify(vertex.Position.X)},{Svgify(vertex.Position.Y)} ");
        }

        svg.Add
        (
            Tag("polyline", ("points", points.ToString()), ("fill", "none"), ("stroke", "black"))
        );
    }

    var sign = +1;
    var boneCounter = 0;
    foreach (var bone in self.Bones)
    {
        var vertexCounter = 0;
        foreach (var vertex in bone.Vertices)
        {
            var positionX = vertex.Position.X;
            var positionY = vertex.Position.Y;

            {
                var x = Svgify(positionX);
                var y = Svgify(positionY);

                svg.Add
                (
                    Tag("circle", ("cx", x), ("cy", y), ("r", "5"), ("stroke", "red"))
                );
            }

            {
                var x = Svgify(positionX + sign * 10);
                var y = Svgify(positionY + sign * 10);

                svg.Add
                (
                    Tag("text", vertexCounter.ToString(), ("x", x), ("y", y), ("style", "fill:green; font-size:10px;"))
                );
                vertexCounter++;
            }
        }

        var boneStartX = Svgify(bone.Vertices[0].Position.X - sign * 20);
        var boneStartY = Svgify(bone.Vertices[0].Position.Y - sign * 20);

        svg.Add
        (
            Tag("text", boneCounter.ToString(), ("x", boneStartX), ("y", boneStartY), ("style", "fill:blue; font-size:10px;"))
        );
        boneCounter++;

        sign *= -1;
    }

    using (var xmlWriter = XmlWriter.Create(path))
    {
        svg.Save(xmlWriter);
    }
}