New Post: Inserting a bitmap into axes

There is an official example here : http://www.oxyplot.org/examplebrowser (in the annotation category).


Here is the source code (from oxyplot) :

[Example("ImageAnnotations")]
        public static PlotModel ImageAnnotations()
        {
            var model = new PlotModel("ImageAnnotations") { PlotMargins = new OxyThickness(60, 4, 4, 60) };
            model.Axes.Add(new LinearAxis(AxisPosition.Bottom));
            model.Axes.Add(new LinearAxis(AxisPosition.Left));

            OxyImage image;
            var assembly = Assembly.GetExecutingAssembly();
            using (var stream = assembly.GetManifestResourceStream("ExampleLibrary.Resources.OxyPlot.png"))
            {
                image = new OxyImage(stream);
            }

            // Centered in plot area, filling width
            model.Annotations.Add(new ImageAnnotation
            {
                ImageSource = image,
                Opacity = 0.2,
                Interpolate = false,
                X = new PlotLength(0.5, PlotLengthUnit.RelativeToPlotArea),
                Y = new PlotLength(0.5, PlotLengthUnit.RelativeToPlotArea),
                Width = new PlotLength(1, PlotLengthUnit.RelativeToPlotArea),
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Middle
            });

            // Relative to plot area, inside top/right corner, 120pt wide
            model.Annotations.Add(new ImageAnnotation
            {
                ImageSource = image,
                X = new PlotLength(1, PlotLengthUnit.RelativeToPlotArea),
                Y = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
                Width = new PlotLength(120, PlotLengthUnit.ScreenUnits),
                HorizontalAlignment = HorizontalAlignment.Right,
                VerticalAlignment = VerticalAlignment.Top
            });

            // Relative to plot area, above top/left corner, 20pt high
            model.Annotations.Add(new ImageAnnotation
            {
                ImageSource = image,
                X = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
                Y = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
                OffsetY = new PlotLength(-5, PlotLengthUnit.ScreenUnits),
                Height = new PlotLength(20, PlotLengthUnit.ScreenUnits),
                HorizontalAlignment = HorizontalAlignment.Left,
                VerticalAlignment = VerticalAlignment.Bottom
            });

            // At the point (50,50), 200pt wide
            model.Annotations.Add(new ImageAnnotation
            {
                ImageSource = image,
                X = new PlotLength(50, PlotLengthUnit.Data),
                Y = new PlotLength(50, PlotLengthUnit.Data),
                Width = new PlotLength(200, PlotLengthUnit.ScreenUnits),
                HorizontalAlignment = HorizontalAlignment.Left,
                VerticalAlignment = VerticalAlignment.Top
            });

            // At the point (50,20), 50 x units wide
            model.Annotations.Add(new ImageAnnotation
            {
                ImageSource = image,
                X = new PlotLength(50, PlotLengthUnit.Data),
                Y = new PlotLength(20, PlotLengthUnit.Data),
                Width = new PlotLength(50, PlotLengthUnit.Data),
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Top
            });

            // Relative to the viewport, centered at the bottom, with offset (could also use bottom vertical alignment)
            model.Annotations.Add(new ImageAnnotation
            {
                ImageSource = image,
                X = new PlotLength(0.5, PlotLengthUnit.RelativeToViewport),
                Y = new PlotLength(1, PlotLengthUnit.RelativeToViewport),
                OffsetY = new PlotLength(-35, PlotLengthUnit.ScreenUnits),
                Height = new PlotLength(30, PlotLengthUnit.ScreenUnits),
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Top
            });

            // Changing opacity
            for (int y = 0; y < 10; y++)
            {
                model.Annotations.Add(
                    new ImageAnnotation
                        {
                            ImageSource = image,
                            Opacity = (y + 1) / 10.0,
                            X = new PlotLength(10, PlotLengthUnit.Data),
                            Y = new PlotLength(y * 2, PlotLengthUnit.Data),
                            Width = new PlotLength(100, PlotLengthUnit.ScreenUnits),
                            HorizontalAlignment = HorizontalAlignment.Center,
                            VerticalAlignment = VerticalAlignment.Bottom
                        });
            }

            return model;
        }

I think in your case, it's the image annotation bind to a point that will be usefull.