René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Support for raster graphics","articleBody":"To support something like [`annotation_raster()`](http://docs.ggplot2.org/current/annotation_raster.html) in our R package, which would lead to awesomeness such as conversion of [ggmap](https://journal.r-project.org/archive/2013-1/kahle-wickham.pdf) (people have been [asking for this](https://github.com/ropensci/plotly/issues/13) 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?\n","author":{"url":"https://github.com/cpsievert","@type":"Person","name":"cpsievert"},"datePublished":"2016-03-14T23:02:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/332/plotly.js/issues/332"}