Plot a shape

[kinnetekLluis]

Hi, I am new to Oxyplot and I don't find info to do a simple shape filled with a color.

In my case I have the line defining the enclosure and I can fullfill the color by a lineseries going up and down, but I feel like it's not the way to go.

Here I present the line data I have:

And what I wanted to do (I generate this with lines, which makes it ineficient if I use too many points):

Edit: I forgot to add the code! (list is the variable with the datapoints)

            var tmp = new PlotModel();
            var s1 = new LineSeries
            {
                StrokeThickness = 1,
                MarkerSize = 0,
                MarkerStroke = OxyColors.IndianRed,
                MarkerType = MarkerType.Plus,
                Color = OxyColor.FromArgb(155, 205, 92, 92),                
            };

            for (int i = 0; i < list[0].Count; i++)
            {
                s1.Points.Add(new DataPoint(list[0][i], list[1][i]));
            }

            tmp.Series.Add(s1);
            tmp.PlotType = PlotType.Cartesian;
            plotoxy.Model = tmp;

[kinnetekLluis]

I found a way pretty simple but I dont know if it's a good practice, using "PolygonAnnotation"...

var tmp = new PlotModel();
var s1 = new LineSeries
            {
                StrokeThickness = 1,
                MarkerSize = 0,
                MarkerStroke = OxyColors.IndianRed,
                MarkerType = MarkerType.Plus,
                Color = OxyColor.FromArgb(155, 205, 92, 92),                
            };

var Event = new PolygonAnnotation();

Event.Layer = AnnotationLayer.BelowAxes;
Event.StrokeThickness = 0;
Event.LineStyle = LineStyle.Automatic;

for (int i = 0; i < list[0].Count; i++)
            {
                s1.Points.Add(new DataPoint(list[0][i], list[1][i]));
                Event.Points.Add(new DataPoint(list[0][i], list[1][i]));
            }

tmp.Series.Add(s1);
tmp.PlotType = PlotType.Cartesian;
tmp.Annotations.Add(Event);
plotoxy.Model = tmp;

But I also dont know how to change the color in this case :S

[VisualMelon]

Nothing wrong with using a PolygonAnnotation. Use the Fill and Stroke properties to change the color of a PolygonAnnotation.

If you want it a series, you could use AreaSeries; I also started work on a PolygonSeries: #1751

What is your use-case? Always keen to know what people are trying to do that library doesn't support well so that we can focus our efforts on useful features.

[kinnetekLluis]

Oooh thanks! Now I got what I wanted and it's much lighter! The only thing I see using PolygonAnnotation is that I still need to provide the series if I want to keep the axis in the range of the values (if not, my annotation is not centered). I think that removing the series would improve the performance a bit more, but then I should manually adjust the axis and for now I don't know yet how to do it x)

I am studying the work envelop of a robot, which is the representation of how the robot can move (in this case) in 2 directions. I had the line because it's the limit were it can go, then I wanted to fill the enclosed space as to represent that the colored space the robot can move around without constrain. Usually, the workspace (or work envelop) is a close shape so for me, it would be really nice to have a direct tool to just fullfil the closed space!

In the future I will have to do this same plot but adding a heatmap representing the velocities on each point of the workeable space, I don't know if there is such tool here but it would be awesome!

Thanks for your previous answer and in advance!

PD: one of the results!

[VisualMelon]

You can specify the axis bounds manually by setting the Minimum and Maximum values, which may make more sense if e.g. you are talking about a well-defined space and want to judge what parts of it the envelope covers.

AreaSeries would otherwise provide comparable functionality if you specify Points but not Points2.

Regarding velocities, heatmaps are all square the moment, and there is no built in vector series. Again, PolygonAnnotation may be useful in this case.

Thanks for explicating the use case!

[kinnetekLluis]

Thanks, your contribution was on point!

Keep the good work! And if you implement that, let me know :D

[VisualMelon]

You can copy the implementation from 36e9234 if it's of any use.