Get every Y value from every line based on a X value

Question

Using OxyPlot library, I have a LineSeries with a max count of 8. Given a X value (got from a left mouse click), how can I get (and show it in the legend) the corresponding Y value for each line?

Answer 1

You can get the point value using the MouseDown method which you attach to your line series found here in the MouseDownEventHitTestResult method

var s1 = new LineSeries();
s1.MouseDown += (s, e) =>
    {
        model.Subtitle = "Y value of nearest point in LineSeries: " +
            Math.Round(e.HitTestResult.NearestHitPoint.Y);
        model.InvalidatePlot(false);
    };

There doesn't appear to be any way to change much of whats in the legend area as that's just a reflection of the graph titles. You could display it to the subtitle as in the example or draw an annotation on the screen.

They have a whole bunch of examples you can look through for ideas here