Completed
Last Updated:
29 May 2023 08:54
by ADMIN
Release R2 2023
Martin Ivanov
Created on:
15 May 2023 13:07
Category:
ChartView
Type:
Bug Report
ChartView: Trackball visuals go outside the plot area on zoom-in or pan
The trackball visuals are the ellipses that snap to the data points when you enable the trackball behavior and hover the plot area. If a trackball is displayed and you zoom-in (via mouse wheel) or pan (via drag), the trackball visuals stay on the proper data point as expected. However, if the zoom-in forces the corresponding data point to go outside the viewport, the trackball follows it and it doesn't get hidden (because it is outside the viewport/plot area).
To work this around, you can manually hide the Ellipse visuals.
private void RadChart_PanOffsetChanged(object sender, Telerik.Windows.Controls.ChartView.ChartPanOffsetChangedEventArgs e)
{
Dispatcher.BeginInvoke(new Action(() =>
{
var chart = (RadCartesianChart)sender;
var trackballs = chart.ChildrenOfType<Ellipse>().Where(x => x.DataContext is DataPointInfo);
foreach (Ellipse visual in trackballs)
{
var dpInfo = (DataPointInfo)visual.DataContext;
RadRect dpSlot = dpInfo.DataPoint.LayoutSlot;
if (!chart.PlotAreaClip.Contains(dpSlot.X, dpSlot.Y))
{
visual.Opacity = 0;
}
else
{
if (visual.Opacity == 0)
{
visual.Opacity = 1;
}
}
}
}));
}
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