René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ENH: provide mapbox viewport coordinates in relayout data","articleBody":"I would like the mapbox subplot relayout data to include the `lon`/`lat` of the viewport corners. This would make it possible to use a mapbox subplot to display an image layer that is dynamically generated for the current viewport.\r\n\r\nThe relayout data currently includes `mapbox.center`, `mapbox.zoom`, `mapbox.bearing`, and `mapbox.pitch`.  I would like to propose that we include a `mapbox.coordinates` property that contains an array of the lon/lat coordinates of the four corners of the viewport. \r\n\r\nThis would match the `coordinates` property that is expected in `image` layers. See https://docs.mapbox.com/mapbox-gl-js/example/image-on-a-map/.  \r\n\r\nThese points can be generated from the mapbox API by following the example in \r\nhttps://github.com/mapbox/mapbox-gl-js/issues/2375#issuecomment-204297638.\r\n\r\nQuestion:\r\nCould `coordinates` be something that is added only to `relayout` data, or would it need to be a new figure property as well?  The reason it's not clear to me that it should be a property is that it would be read-only.  I don't think we could really support setting `coordinates` as a way to set where to place the viewport (at least in the case of non-zero `bearing` and `pitch`).\r\n","author":{"url":"https://github.com/jonmmease","@type":"Person","name":"jonmmease"},"datePublished":"2019-12-02T18:45:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/4399/plotly.js/issues/4399"}