private void ChartMouseMove(object sender, MouseEventArgs e)
{
if (!IsEnabled || !series.Visible)
{
SetCrosshairVisibility(Visibility.Collapsed);
return;
}
// Clip crosshair lines within a diagram bounds.
ClipCrosshairLines();
// Get the current cursor position and transform it to the diagram coordinates.
Point position = e.GetPosition(chart);
DiagramCoordinates diagramCoordinates =
diagram.PointToDiagram(position);
if (!diagramCoordinates.IsEmpty)
{
// Get a value of a series point that is nearest to the current cursor position.
double seriesValue = GetSeriesValue(series,
diagramCoordinates.DateTimeArgument);
if (!double.IsNaN(seriesValue))
{
// Specify the text for X and Y crosshair labels.
valueX.Text = (diagramCoordinates.DateTimeArgument).
ToString("D", CultureInfo.CurrentCulture);
valueY.Text = Math.Round(seriesValue, 2).
ToString(CultureInfo.CurrentCulture);
// Show the crosshair cursor elements.
SetCrosshairVisibility(Visibility.Visible);
// Convert chart coordinates to screen coordinates to
// place crosshair labels along the scale.
ControlCoordinates controlCoordinates =
diagram.DiagramToPoint(diagramCoordinates.
DateTimeArgument, seriesValue);
PlaceValuesOnAxis(position.X, controlCoordinates.Point.Y);
// Draw the crosshair cursor.
Canvas.SetLeft(verticalLine, position.X);
Canvas.SetTop(horizontalLine, controlCoordinates.Point.Y);
}
}
else
{
// Hide the crosshair cursor elements.
SetCrosshairVisibility(Visibility.Collapsed);
}
}
private void UpdateCrosshairPosition()
{
ClipCrosshairLines();
currentXPosition = GetXPosition();
double seriesValue = GetSeriesValue(series, currentXPosition);
ControlCoordinates controlCoordinates = diagram.DiagramToPoint(currentXPosition, seriesValue);
SetNumbersToValuePads(seriesValue.ToString("F2"));
PlaceValuesOnAxis(controlCoordinates.Point.X, controlCoordinates.Point.Y);
SetCrosshairVisibility(Visibility.Visible);
Canvas.SetLeft(verticalLine, controlCoordinates.Point.X);
Canvas.SetTop(horizontalLine, controlCoordinates.Point.Y);
}
protected override ControlCoordinates GetTopLeftCoordinates()
{
return(diagram.DiagramToPoint(
(double)axisX.ActualRange.ActualMinValue,
(double)axisY.ActualRange.ActualMaxValue));
}