// 7. Create a function for mouse move event handler.
private void _chart_MouseMove(object sender, MouseEventArgs e)
{
// Call BeginUpdate for chart to disable rendering while mouse is moving
// over the chart to improve performance.
chart.BeginUpdate();
// Set label visible when not hovered over by mouse.
mouseAnnotation.Visible = false;
// Check if any object has been found under the mouse.
object obj = chart.GetActiveMouseOverObject();
if (obj != null)
{
// Check if the active mouse over object is a PointLineSeries object.
if (obj is PointLineSeries3D)
{
PointLineSeries3D pointLineSeries3D = obj as PointLineSeries3D;
// Get the point last hit by mouse.
int pointIndex = pointLineSeries3D.LastMouseHitTestIndex;
SeriesPoint3D point = pointLineSeries3D.Points[pointIndex];
// Set annotation position to the moused over point.
mouseAnnotation.TargetAxisValues.SetValues(point.X, point.Y, point.Z);
// Set annotation text to display information about the moused over point.
mouseAnnotation.Text = "Series index: " + chart.View3D.PointLineSeries3D.IndexOf(pointLineSeries3D).ToString()
+ "\nPoint index: " + pointIndex.ToString()
+ "\nX=" + point.X.ToString("0.0") + " ; Y=" + point.Y.ToString("0.0") + " ; Z=" + point.Z.ToString("0.0");
// Set the annotation visible while mouse is hovering over the point.
mouseAnnotation.Visible = true;
}
}
// Call EndUpdate to enable rendering again after handling mouse move event.
chart.EndUpdate();
}