public override void UpdateSvg(XmlDocument document, IEnumerable items)
{
try
{
var elements = (IEnumerable <int>)items;
string linePoints = string.Empty;
double pointPosition = 0;
double svgWidth = (elements.Count() * PointsDistance) + 13;
var svgElement = document.DocumentElement;
var svgAttr = svgElement.Attributes;
svgAttr["viewBox"].Value = $"-10 -5 {svgWidth} 105";
var root = document.DocumentElement.GetElementsByTagName("g").Cast <XmlElement>().LastOrDefault();
var polylineNodeToCopy = root.GetElementsByTagName("polyline").Cast <XmlElement>()
.FirstOrDefault(x => x.HasAttribute("class") && x.Attributes["class"].Value == "line-chart");
var pointNodeToCopy = root.GetElementsByTagName("circle").Cast <XmlElement>()
.FirstOrDefault(x => x.HasAttribute("class") && x.Attributes["class"].Value == "point-chart");
foreach (var el in elements)
{
if (el < 0)
{
continue;
}
var yPosition = 100 - el;
if (ShowPoints)
{
var newPointNode = pointNodeToCopy.CloneNode(true);
var pointAttr = newPointNode.Attributes;
pointAttr["cx"].Value = pointPosition.ToString();
pointAttr["fill"].Value = PointsColor.ToHex();
pointAttr["r"].Value = PointSize.ToString();
pointAttr["cy"].Value = yPosition.ToString();
root.InsertAfter(newPointNode, root.LastChild);
}
linePoints += $"{pointPosition},{yPosition - 1} ";
pointPosition += PointsDistance;
}
var barAttr = polylineNodeToCopy.Attributes;
barAttr["points"].Value = linePoints;
barAttr["stroke"].Value = LineColor.ToHex();
barAttr["stroke-width"].Value = LineWidth.ToString();
root.RemoveChild(pointNodeToCopy);
}
catch (InvalidCastException ex)
{
throw new ItemsSourceException("ItemsSource for Line chart must to be a collection of values IEnumerable<int>", ex);
}
}
