Hello Martin,

thank you for the feedback. I just update this request with general information and samples from Wikipedia and other vendors:

1. Geographic map showing the contour lines of the same height: https://en.wikipedia.org/wiki/Contour_line ,

2. https://www.infragistics.com/help/winforms/datachart-scatter-contour-series  
3. https://mathworld.wolfram.com/ContourPlot.html 

ADDITION: Important is the redrawing behaviour when the contour chart gets new data. The chart must show the old graph with "old" data until the new chart with "new" data is rendered, without showing empty chart area in between. This must be exactly like the behaviour of Telerik RadCartesianChart3D. This will important for showing the smooth changing of chart images during the changing chart data in a row. Example: time series of 3D data.

Regards,
Ivan Issaev

Fer Telerik,

we really need the contour projection of the 3D chart. Current feature request were not updated since years. I can help you to provide the necessary updates and data. See my duplicated feature request connected to this one. 

Actually it is possible to use the surface projection on XY surface, but it is not enough. We need it both contour and surface charts as real 2D charts, not a XY projection inside the 3D XYZ chart.

The 2D contour and surface charts are being used by the customers in their scientific articles and we have to implement they request. 

With hope,

Ivan Issaev

Thanks Martin!

Some additional information that might be helpful. Probably the most popular tool for contour plots is MATLAB. There are several types of contour plots. 

For the first one the input is a matrix (X, Y, Z), and based on the Z-values the contour levels are chosen automatically. I guess they are doing something similar like the one you have for the 3D plot, but in 2D.

The second one is “fcontour”, and this is the one that I’m interested in at the moment. Fcontour(f) plots the contour lines of the function Z = F(X, Y) for constant levels Z. This one displays isolines and fill the areas between the isolines using constant colors corresponding to the Z-level color map. In MATLAB they have options to calculate this isolines automatically, but this is a very general solution. In many cases this contours have a specific shapes base on the physics of the data (e.g. topographic map contours in elevation map). In my case these are efficiency contours crossing speed lines. The point is that each developer should be able to calculate the contour shapes F(X, Y) and that could be the input for the toolkit.

Regards,
Ventsi 

Adding a contour plot to ChartView will be very helpful for many type of applications. I think the easiest way to explain it is to look at each contour as a shape that have to be filled out with a specific color. Usually the contours is a spline or a couple of crossing each other splines that create a closed space. Inside each contour we could have many other contours with different colors. Probably the easiest way is to put each inner contour in higher Z position, so it will overlay portion of the larger contour below it. Maybe there is a better solution for this. 
In the attached example, I have calculated the points for each contour. What I need is to connect the points for each contour with a spline and to fill out the space inside with a specific color.
Thanks!

Hi Martin,
Do you know when this feature is likely to be added?  We need to start on the GUI within the next month or so, so if you are able to incorporate it within that time frame I would like to purchase a license.
I think I gave you the example before, but if not I include it here.
Best regards
Barney