Stefan Stoyanov, Good day!

Your example (xamDataChartAddPoints), helped me a lot. Thank you very much!

I have to ask you. Please send me a sample to the line. By clicking on the chart to add a new point in line.

x++; y=y_mouse.

Hello kabsau,

Try foolowing code (modified Infragistics sample).

Add somewhere:

xamChart.PreviewMouseLeftButtonDown += OnPreviewMouseLeftButtonDown;

void OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    // Assumed there is only one serie.
    var series = this.xamChart.Series.FirstOrDefault();
    if (series == null) return; 
 
    var point = e.GetPosition(series);
 
    if (series.Chart.Axes.OfType<NumericXAxis>().Any())
    {
        double unscaledX;
        double unscaledY;
        UnscalePoint(series, point, out unscaledX, out unscaledY);
 
        var data = xamChart.DataContext as ObservableCollection<LiveViewDataPoint>;
 
        // Get insertion index.
        int index = 0;
        foreach (var dataPoint in data)
        {
            if (dataPoint.X < unscaledX)
            {
                index++;
                continue;
            }
 
            if (dataPoint.X == unscaledX)
            {
                // Don't insert points with the same X-coordinate.
                index = -1;
            }
            break;
        }
 
        var newPoint = new LiveViewDataPoint() {X = (int) unscaledX, Y = unscaledY};
 
        if (index == data.Count())
        {
            // Add point at the end of the curve.
            data.Add(newPoint);
        }
        else if (index != -1)
        {
            // Insert new point.
            data.Insert(index, newPoint);
        }
    }
}

public class LiveViewDataPoint
{ 
    public double X { get; set; }
    public double Y { get; set; }
}

private static void UnscalePoint(Series series, Point point, out double unscaledX, out double unscaledY)
{
    var xAxis = series.Chart.Axes.OfType<NumericXAxis>().First();
    var yAxis = series.Chart.Axes.OfType<NumericYAxis>().First();
 
    var viewport = new Rect(0, 0, xAxis.ActualWidth, yAxis.ActualHeight);
    var window = series.Chart.WindowRect;
 
    unscaledX = xAxis.GetUnscaledValue(point.X, window, viewport);
    unscaledY = yAxis.GetUnscaledValue(point.Y, window, viewport);
}

Dear bonitz, I could not repeat your example. I understand the idea of work, but I had not achieved the result. Please laid out his example in the project (as Stefan Stoyanov).

Hi Guys,

Is there a way to move the existing data points to a new position?

Friendly Regards,

Roelof

Hello Kabsau,

try please this example

Bonizt