Read coordinates from OxyPlot

Question

I have a coordinate system with OxyPlot. Different points are generated in this coordinate system. Now I would gladly ask the points by button, is it possible to read the points again? The points are displayed in the coordinate system.

This is eg Get a list of the points (a point always contains an X and a Y value) Which I afterwards the list (or whatever the solution is) can query and all points receive the indicated in this coordinate system.

The picture should make more clear what I would like.

I have a coordinate system and in this coordinate system points are displayed which were generated before. Now I want to get these points from the coordinate system into a list or something similar.

Answer 1

This is a working example which listens to plotModel.MouseDown (You need to change it) and displays a window with the required information. Note that you can display the resulted listbox in different Controls such as Popup.

public partial class MainWindow : Window
{ 
    PlotModel plotModel;
    public MainWindow()
    {
        InitializeComponent(); 

        plotModel = new PlotModel { Title = "OxyPlot" };
        plotModel.Axes.Add(new OxyPlot.Axes.LinearAxis { Position = OxyPlot.Axes.AxisPosition.Bottom });
        plotModel.Axes.Add(new OxyPlot.Axes.LinearAxis { Position = OxyPlot.Axes.AxisPosition.Left, Maximum = 10, Minimum = 0 });
        var series1 = new OxyPlot.Series.LineSeries
        {
            MarkerType = MarkerType.Circle,
            MarkerSize = 5,
            MarkerStroke = OxyColors.White
        };
        series1.Points.Add(new DataPoint(0, 6));
        series1.Points.Add(new DataPoint(1, 2));
        series1.Points.Add(new DataPoint(2, 4));
        series1.Points.Add(new DataPoint(3, 2));
        series1.Points.Add(new DataPoint(4, 7));
        series1.Points.Add(new DataPoint(6, 6));
        series1.Points.Add(new DataPoint(8, 8));
        series1.Smooth = true;
        plotModel.Series.Add(series1);
        this.Content = new OxyPlot.Wpf.PlotView() { Model = plotModel  };
        plotModel.MouseDown += PlotModel_MouseDown;
    }

    private void PlotModel_MouseDown(object sender, OxyMouseDownEventArgs e)
    {
        var s = plotModel.Series[0] as LineSeries; // asuming that there is just one line series
        ListBox list = new ListBox();
        list.Style = (Style)TryFindResource("listOfPoint");
        list.ItemsSource = s.Points; 
        Window win = new Window() { Content = list, Owner = this, WindowStartupLocation = WindowStartupLocation.CenterOwner }; // You can display the results in a Popup too
        win.ShowDialog(); // You might call Show() instead.
    }  
}

You need the following style

<Window.Resources>
    <local:DataPointToStringConverter x:Key="DataPointToStringConverter"/>
    <Style x:Key="listOfPoint" TargetType="ListBox">
        <Setter Property="AlternationCount" Value="1000"/>
        <Setter Property="ItemTemplate">
            <Setter.Value>
                <DataTemplate >
                    <StackPanel Orientation="Horizontal">
                        <TextBlock >
                            <TextBlock.Text>
                                <MultiBinding Converter="{StaticResource DataPointToStringConverter}">
                                    <Binding />
                                    <Binding Path="ItemsSource" RelativeSource="{RelativeSource AncestorType=ListBox, Mode=FindAncestor}"/>
                                </MultiBinding>
                            </TextBlock.Text>
                        </TextBlock>
                    </StackPanel>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>

Which uses the following converter:

public class DataPointToStringConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        DataPoint point = (DataPoint)values[0];
        List<DataPoint> points = ((IEnumerable<DataPoint>)values[1]).ToList();
        return (points.IndexOf(point) + 1).ToString() +"-  (" + point.X.ToString() + " , " + point.Y.ToString() + ")";
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    } 
}

You can change how DataPoint is converted into a string in this converter.