#pragma warning restore CS1998
private static XElement RenderPath(Polygon polygon, Rgba32 color)
{
XNamespace ns = "http://www.w3.org/2000/svg";
var sb = new StringBuilder();
var first = true;
foreach (var segment in polygon.LineSegments)
{
if (first)
{
first = false;
sb.Append($"M{segment.EndPoint.X.ToString(CultureInfo.InvariantCulture)} {segment.EndPoint.Y.ToString(CultureInfo.InvariantCulture)}");
continue;
}
if (segment is LinearLineSegment lineSegment)
{
sb.Append($"L {lineSegment.EndPoint.X.ToString(CultureInfo.InvariantCulture)} {lineSegment.EndPoint.Y.ToString(CultureInfo.InvariantCulture)}");
}
else if (segment is CubicBezierLineSegment bezierSegment)
{
var fieldInfo = typeof(CubicBezierLineSegment).GetField("controlPoints", BindingFlags.NonPublic | BindingFlags.Instance);
var points = (PointF[])fieldInfo.GetValue(bezierSegment);
var p1 = points[1];
var p2 = points[2];
var p3 = points[3];
sb.Append($"C {p1.X.ToString(CultureInfo.InvariantCulture)} {p1.Y.ToString(CultureInfo.InvariantCulture)} {p2.X.ToString(CultureInfo.InvariantCulture)} {p2.Y.ToString(CultureInfo.InvariantCulture)} {p3.X.ToString(CultureInfo.InvariantCulture)} {p3.Y.ToString(CultureInfo.InvariantCulture)}");
}
}
var path = new XElement(ns + "path");
path.SetAttributeValue("stroke", "#" + color.ToRgbHex());
path.SetAttributeValue("fill", "#" + color.ToRgbHex());
path.SetAttributeValue("d", sb.ToString());
return(path);
}
#pragma warning disable CS1998
protected async override Task <byte[]> RenderGlyphs(IPathCollection glyphs, Int32 squareSize, Rgba32 foregroundColor, Rgba32 backgroundColor, CancellationToken cancellationToken)
{
XNamespace ns = "http://www.w3.org/2000/svg";
var root = new XElement(ns + "svg");
root.SetAttributeValue("width", squareSize);
root.SetAttributeValue("height", squareSize);
var background = new XElement(ns + "rect");
background.SetAttributeValue("width", "100%");
background.SetAttributeValue("height", "100%");
background.SetAttributeValue("fill", "#" + backgroundColor.ToRgbHex());
root.Add(background);
foreach (var glyph in glyphs)
{
if (glyph is Polygon polygon)
{
var path = RenderPath(polygon, foregroundColor);
root.Add(path);
}
else if (glyph is ComplexPolygon complexPolygon)
{
var first = true;
foreach (var polygonPart in complexPolygon.Paths.Cast <Polygon>())
{
var path = RenderPath(polygonPart, first ? foregroundColor : backgroundColor);
root.Add(path);
first = false;
}
}
}
using (var ms = new MemoryStream()) {
#if NETSTANDARD2_0
root.Save(ms, SaveOptions.DisableFormatting);
#elif NETSTANDARD2_1
await root.SaveAsync(ms, SaveOptions.DisableFormatting, cancellationToken);
#endif
ms.Seek(0, SeekOrigin.Begin);
return(ms.ToArray());
}
}