Hi,
In my project, I am using a trackball on a chart to display text during mouseover. What I need to be able to do is display a the result of a function where the inputs are the x and y coordinates of the nearest point to the mouse. For example, in a histogram, I would want to display the percentile in the mouse over, so if a user hovers over a point, I'd want the caption to display something like:
Percentile: 35%
I know this can be done from a custom tooltip triggered by the ChartRegionMouseHover event, which I have implemented, but I prefer the smoothness of the trackball. Is there any way to do this? I couldn't find an appropriate event to create a handler for.
|
this.chartControl1.Trackball.Visible = true;
this.chartControl1.Trackball.TrackballTooltipRendering += Trackball_TrackballTooltipRendering; //event to modify label
private void Trackball_TrackballTooltipRendering(object sender, TrackballTooltipEventArgs args)
{
var index = args.pointIndex;
args.Text = "";
foreach (ChartSeries series in chartControl1.Series)
{
var point = series.Points[index];
args.Text = "Percentile: " + point.X.ToString() + "% ";
}
} |
Thank you. That really helped. As a quick follow up, would I be able to use this event to also fix the trackball tooltip location? For example, if I want the trackball tooltip to stay fixed at the top right of the chart area?
