private void SmoothScroll(DataValue newValue)
{
if (this.series == null)
{
this.series = new DataSeries() { Name = "", Values = new List<DataValue>() };
}
// we do not use the data value x coordinates right now because they are timestamp values
// and they bunch up and are not smooth...due to random network noise, so until we figure
// out something better the graph is smoothing out the x values.
double x = 0;
if (this.series.Values.Count > 0)
{
x = this.series.Values[this.series.Values.Count - 1].X + 1;
}
DataValue copy = new Model.DataValue()
{
X = x,
Y = newValue.Y
};
this.series.Values.Add(copy);
PathGeometry g = Graph.Data as PathGeometry;
if (g == null)
{
UpdateChart();
return;
}
PathFigure f = g.Figures[0];
if (ComputeScale() || g.Bounds.Width > 2 * this.ActualWidth)
{
// can't do incremental, have to reset scaled values.
if (this.series != null && this.series.Values.Count > 2 * this.ActualWidth)
{
// purge history since this is an infinite scrolling stream...
this.series.Values.RemoveRange(0, this.series.Values.Count - (int)this.ActualWidth);
System.Diagnostics.Debug.WriteLine("Trimming data series {0} back to {1} values", this.series.Name, this.series.Values.Count);
}
UpdateChart();
}
else
{
AddScaledValues(f, updateIndex, series.Values.Count);
Graph.UpdateLayout();
if (g.Bounds.Width >= this.ActualWidth)
{
Canvas.SetLeft(Graph, Canvas.GetLeft(Graph) - 1);
}
updateIndex = series.Values.Count;
}
}
public void SetData(DataSeries series)
{
this.dirty = true;
this.series = series;
this.UpdateLayout();
if (this.ActualWidth != 0)
{
UpdateChart();
}
}