/// <summary>Draws a snapped border with uniform or non-uniform thickness.</summary>
internal static void DrawFrame(DrawingContext dc, Brush fill, Brush stroke, Thickness thickness, Rect rect) {
var x = Math.Round(rect.X);
var y = Math.Round(rect.Y);
var w = Math.Round(rect.Width);
var h = Math.Round(rect.Height);
if (fill != null) {
dc.DrawRectangle(fill, null, rect);
}
if (stroke != null && !thickness.IsZero()) {
DrawVertical(dc, stroke.ToPen(thickness.Left), x - 0.5, y, y + h);
DrawVertical(dc, stroke.ToPen(thickness.Right), x + w + 0.5, y, y + h);
DrawHorizontal(dc, stroke.ToPen(thickness.Top), y - 0.5, x, x + w);
DrawHorizontal(dc, stroke.ToPen(thickness.Bottom), y + h + 0.5, x, x + w);
}
}
public void AddThicknessOptional(Thickness th, string prefix, string suffix = null)
{
if (th.IsZero()) return;
AddThickness(th, prefix, suffix);
}