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Support for raster graphics #332

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@cpsievert

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@cpsievert

To support something like annotation_raster() in our R package, which would lead to awesomeness such as conversion of ggmap (people have been asking for this for a long time), I need support for displaying a matrix of arbitrary color codes. Using a heatmap seems out of the question since we can't generate a sensible colorscale, and drawing a marker for each cell seems inefficient. Any thoughts on how to approach this?

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