Hi Graham,

PFA sample code, you can test it with different number of datapoints by changing iterator controler from code. furthermore you can check change in loading and the refresh time after hitting the load button multiple times.

Thanks

Hi Graham,
I have checked If we add Markers in Series then it shows tooltipp. Is it necessary to add Markers to get tooltip on datapoints?

As Markers increase the loading time

Thanks

you can adjust the frequency of the date category labels with something like this:

Axis xAxis = this.cht.Axes[0];
xAxis.AutoRange = false;
xAxis.Minimum = 0;
xAxis.Maximum = seriesValues.DataPoints.Count - 1;
xAxis.Unit = seriesValues.DataPoints.Count/20.0;

Adjust the 20.0 value to change the frequency.

In the latest code I'm getting this as the performance (for i < 1000)

And it does not seem to be affected by subsequent runs of the population, how does this compare to what you are getting?

You can turn on markers for the line series to get the tooltips, but it will affect the performance when you have that many data points. You could do something with the series mouse events to display some tooltips, but it would be a bit complicated, as each line is actually associated with two seperate data points.

-Graham

You can experiment with something like this for the tooltips:

new xaml:

    <UserControl.Resources>
        <DataTemplate x:Key="tooltipTemplate">
            <Border Background="White" CornerRadius="5" Padding="5">
                <TextBlock Text="{Binding}" /> 
            </Border> 
        </DataTemplate>
    </UserControl.Resources>

and (in your grid, under the XamWebChart):

<Popup x:Name="thePopup" Grid.Column="0" Grid.Row="1" IsOpen="False"/>

new code behind (remember to hook up these methods with the corresponding chart events):

 private void cht_DataItemMouseMove(object sender,
            DataItemMouseEventArgs e)
        {
            //dealing with a line chart
            Line l = e.Element as Line;

            //need to transform the hovered point from the 
            //chart control coordinates to the coordinates on
            //which the line is plotted (an inner canvas)
            Canvas plottingPane = l.Parent as Canvas;

            if (plottingPane != null && l != null)
            {
                //transform the clicked point to a point relative to the canvas the 
                //line is drawn on.
                Point pointInChart =
                    cht.TransformToVisual(plottingPane)
                    .Transform(e.Position);
                if (l.Tag != null &&
                    l.Tag is Dictionary<Type, object>)
                {
                    //get the point index of the line. the line is really encompassing two points
                    //however.
                    int pointIndex =
                        (int)(l.Tag as Dictionary<Type, object>)[typeof(int)];


                    double distToStartOfLine =
                        Math.Pow((l.X1 - pointInChart.X), 2) +
                        Math.Pow((l.Y1 - pointInChart.Y), 2);
                    double distToEndOfLine =
                        Math.Pow((l.X2 - pointInChart.X), 2) +
                        Math.Pow((l.Y2 - pointInChart.Y), 2);
                    //is the clicked point closer to the start of the line or the end of the line?
                    if (distToStartOfLine > distToEndOfLine)
                    {
                        pointIndex += 1;
                    }

                    Series series =
                        (l.Tag as Dictionary<Type, object>)[typeof(Series)]
                        as Series;
                    if (series != null)
                    {
                        thePopup.Child = new ContentControl()
                        {
                            Content =
                            series.DataPoints[pointIndex].ToolTip,
                            ContentTemplate =
                            Resources["tooltipTemplate"] as DataTemplate
                        };
                        thePopup.VerticalOffset = e.Position.Y - 25.0;
                        thePopup.HorizontalOffset = e.Position.X;
                        thePopup.IsOpen = true;
                    }
                }
            }
        }

        private void cht_DataItemMouseLeave(object sender,
            DataItemMouseEventArgs e)
        {
            thePopup.IsOpen = false;
        }

Let me know if that helps!

-Graham