LightningChart Support Forums

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LineSeriesCursor cursor = new LineSeriesCursor(_chart.ViewXY, axisX);
cursor.LineStyle.Color = Color.FromArgb(0, 255, 0, 0);  // Set transparent color. Visible = false would prevent dragging.
cursor.ValueAtXAxis = 5;
cursor.SnapToPoints = false;
cursor.PositionChanged += Cursor_PositionChanged;
_chart.ViewXY.LineSeriesCursors.Add(cursor);

PointLineSeries cursorSeries = new PointLineSeries(_chart.ViewXY, _chart.ViewXY.XAxes[0], _chart.ViewXY.YAxes[0]);
cursorSeries.AllowUserInteraction = false;
cursorSeries.PointsVisible = false;
cursorSeries.LineVisible = true;
cursorSeries.CursorTrackEnabled = false; // Don't let the cursor track this series
cursorSeries.LineStyle.Color = Color.Red;
SeriesPoint[] p = new SeriesPoint[2]
{
    new SeriesPoint(5, 0),
    new SeriesPoint(5, 100)
};
cursorSeries.Points = p;
cursorSeries.Title.Text = "Cursor";
_chart.ViewXY.PointLineSeries.Insert(2, cursorSeries);


        private void Cursor_PositionChanged(object sender, PositionChangedEventArgs e)
        {
            foreach (var series in _chart.ViewXY.PointLineSeries)
            {
                if (series.Title.Text == "Cursor") // Move the cursor series when LineSeriesCursor moves
                {
                    series.Points[0].X = e.NewValue;
                    series.Points[1].X = e.NewValue;
                    series.InvalidateData();
                }
            }
        }