Custom shape render for chart data

[Scott Andrews]

When rendering a chart, it is only possible to specify a theme for a given series. In the chart, I need to be able to customize the representation of a specific data point in the chart and render it differently then the standard theme.

I was able to accomplish this by adding a callback hook inside the chart render lifecycle after the shape is created. The callback can override properties of the shape as desired. An optional map of extra params is passed alongside the shape to provide context of the rendering. In this case, the raw value of the datapoint, and the index position in the dataset.

There is likely a cleaner implementation then what I have provided, however, the basic functionality is critical to our project.

[bill]

Pushing TBD tickets to future to clear them from the 1.4 queue, please assign a real milestone if you start working on these tickets.

[dylan]

This would have been very useful to land years ago. I will review for 1.11.

[dylan]

Fixed in ​https://github.com/dojo/dojox/commit/54022248000ddacd6e26e022fb150bf4d5d2f18f