Placing marker at custom location

Oystein Bjorke 6 years ago 0
This discussion was imported from CodePlex

endorphing wrote at 2013-01-25 20:54:

Is there a way to place a marker at a custom location. If I had 5 points in my LineSeries, and I only want to put markers at the 2nd and 4th points, what's the best way to achieve that? 

Thanks in advance for your help. 

objo wrote at 2013-02-10 23:20:

I would add a ScatterSeries for the markers. The ScatterSeries class has more options for the markers. I don't think there should be more marker features in the LineSeries.

endorphing wrote at 2013-02-26 21:59:

Thanks for the tip. A ScatterSeries would work, except I need mouse events on the series to be enabled.

I ended up implementing a custom LineSeries. I re-defined the MarkerFill & MarkerStroke properties, so that setting them here doesn't enable markers in the base class.
    public class MarkerLineSeries : LineSeries
        public IList<int> MarkerLocations { get; private set; }

        new public OxyColor MarkerFill { get; set; }

        new public OxyColor MarkerStroke { get; set; }

        public MarkerLineSeries()
            : this(string.Empty)

        public MarkerLineSeries(string title)
            : this(title, new Collection<int>())

        public MarkerLineSeries(string title, IList<int> markerLocations)
            : base(title)
            MarkerLocations = markerLocations;

        public override void Render(IRenderContext rc, PlotModel model)
            base.Render(rc, model);
            foreach (var location in MarkerLocations)
                if (location < 0 || location > Points.Count - 1) break;
                var pt = XAxis.Transform(Points[location].X, Points[location].Y, YAxis);