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I’m afraid it isn’t a feature in our WPF Chart library at the moment. You can request features and vote on them by going here.
What you can do is use a normal uniform heat map, which renders an NxM 2-dimensional array of data, then apply some mask over the top, to draw a rectangle with hole so that only part of the heat map is visible. Take a look at this answer on StackOverflow for how to create such a shape.
For the heat map itself and heat map legend, this is supported. Take a look at our Heatmap examples in the SciChart WPF Examples Suite for more info.
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