Strokes能否转化成SVG?或GetImage获取SVG

自己解决了：

` public class SvgUtils { public static string AbsPath2SVGText(IEnumerable<IEnumerable> Strokes) { if (!Strokes.Any()) return null;

        var maxWidth = 0d;
        var maxHeight = 0d;
        Strokes.ForEach(p => p.ForEach(pt => {
            maxWidth = Math.Max(pt.X, maxWidth);
            maxHeight = Math.Max(pt.Y, maxHeight);
        }));

        var doc = new StringBuilder();
        doc.Append(@"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""no""?>")
                    .Append(@"<!DOCTYPE svg PUBLIC ""-//W3C//DTD SVG 1.1//EN"" ""http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"">")
                    .Append(@"<svg xmlns=""http://www.w3.org/2000/svg"" version=""1.1"" ")
                    .Append($@"width=""{Convert.ToInt32(maxWidth)}"" height=""{Convert.ToInt32(maxHeight)}"" >");
        foreach (var ps in Strokes) {
            doc.Append($"<path stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"2\" stroke=\"#0000ff\" fill=\"none\" d=\"");

            Point prev = Point.Zero;
            for (var i = 0; i < ps.Count(); i++) {
                var it = ps.ElementAt(i);
                if (i == 0)
                    doc.AppendFormat("M {0} {1} ", it.X, it.Y);
                else {
                    var x = it.X - prev.X;
                    var y = it.Y - prev.Y;
                    doc.AppendFormat("l {0} {1} ", x, y);
                }
                prev = it;
            }
            doc.Append("\"/>");
        }
        doc.Append("</svg>");
        return doc.ToString();
        //System.IO.File.WriteAllText("d:\\test.svg", doc.ToString(), Encoding.UTF8);
    }
    public static string AbsPath2SVGDateImage(IEnumerable<IEnumerable<Point>> Strokes) {
        var doc = AbsPath2SVGText(Strokes);
        if (string.IsNullOrEmpty(doc))
            return null;
        var b64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(doc));
        return $"image/svg+xml;base64,{b64}";
    }
}`

xamarin / SignaturePad

Strokes能否转化成SVG?或GetImage获取SVG #180