public override void UpdateSvg(XmlDocument document, IEnumerable items)
{
try
{
var elements = (IEnumerable <Tuple <int, string> >)items;
var offset = 25;
var previousOffset = -1;
var previousSpace = -1;
var root = document.DocumentElement.GetElementsByTagName("g").Cast <XmlElement>().LastOrDefault();
var donutNode = root.GetElementsByTagName("circle").Cast <XmlElement>()
.FirstOrDefault(x => x.HasAttribute("class") && x.Attributes["class"].Value == "donut-hole");
var donutAttr = donutNode.Attributes;
donutAttr["fill"].Value = FillColor.ToHex();
var ringNode = root.GetElementsByTagName("circle").Cast <XmlElement>()
.FirstOrDefault(x => x.HasAttribute("class") && x.Attributes["class"].Value == "donut-ring");
var ringAttr = ringNode.Attributes;
ringAttr["stroke-width"].Value = StrokeWidth.ToString();
ringAttr["stroke"].Value = RingColor.ToHex();
var segmentNodeToCopy = root.GetElementsByTagName("circle").Cast <XmlElement>()
.FirstOrDefault(x => x.HasAttribute("class") && x.Attributes["class"].Value == "donut-segment");
var centerTextNode = root.GetElementsByTagName("text").Cast <XmlElement>()
.FirstOrDefault(x => x.HasAttribute("class") && x.Attributes["class"].Value == "center-text");
centerTextNode.InnerText = CharTitle;
var textAttr = centerTextNode.Attributes;
textAttr["fill"].Value = TitleColor.ToHex();
foreach (var el in elements)
{
if (el.Item1 < 0)
{
continue;
}
var newnode = segmentNodeToCopy.CloneNode(true);
var attr = newnode.Attributes;
attr["stroke-width"].Value = StrokeWidth.ToString();
attr["stroke"].Value = el.Item2;
var spaceDash = 100 - el.Item1;
attr["stroke-dasharray"].Value = $"{ el.Item1 }, { spaceDash }";
var newOffset = (previousOffset < 0) ? offset : (previousOffset + previousSpace);
if (newOffset > 100)
{
newOffset -= 100;
}
attr["stroke-dashoffset"].Value = newOffset.ToString();
root.InsertAfter(newnode, root.LastChild);
previousOffset = newOffset;
previousSpace = spaceDash;
}
root.RemoveChild(segmentNodeToCopy);
}
catch (InvalidCastException ex) {
throw new ItemsSourceException("ItemsSource for Donut chart must to be a collection of values and colors IEnumerable<Tuple<int,string>>", ex);
}
}
