How to draw rectangle over a plot?

Question

Is it possible to draw rectangle using OxyPlot? Something like :

or does OxyPlot not support this?

Answer 1

You can indeed.

There's a couple of ways you can do it. I would prefer to use an annotation as this will also give you a highlighted background and give you the option to add click events on this area. There's probably a way to remove the highlight if you want to make it look like the image you've provided.

var Event = new PolygonAnnotation();

Event.Layer = AnnotationLayer.BelowAxes;
Event.StrokeThickness = 5;
Event.Stroke = OxyColor.FromRgb(0, 0, 255);
Event.LineStyle = LineStyle.Automatic;

Event.Points.Add(new DataPoint(X, Y));
Event.Points.Add(new DataPoint(X, Y));            
Event.Points.Add(new DataPoint(X, Y));
Event.Points.Add(new DataPoint(X, Y));

Another more simplistic way is to create a line series and give it the corners of your rectangle.