public OpenXmlElement GetOrCreateShapeProperties()
{
DataPoint dataPoint = this.series.Element.Elements <DataPoint>().Where(dp => dp.Index?.Val <= this.valueIndex).LastOrDefault();
if (!(dataPoint?.Index?.Val?.HasValue ?? false) || dataPoint.Index.Val != this.valueIndex)
{
dataPoint = this.series.Element.InsertAfter(
new DataPoint()
{
Index = new Index()
{
Val = this.valueIndex
},
Bubble3D = new Bubble3D()
{
Val = false
}
},
dataPoint
);
}
return(dataPoint.ChartShapeProperties ?? dataPoint.AppendChild(new ChartShapeProperties()));
}