[Feature] Put Zoomable Background Picture Behind Graph

[kp565]

What problem does this feature solve?

I want to have a graph in grafana with a topology drawing behind it for better understanding. I want to be able to zoom in with the nodes still being in the same position relating to the image

What does the proposed API look like?

currently I am trying to incorporate wheelzoom (http://www.jacklmoore.com/wheelzoom/) unsuccessfully

with this feature it could be as simple as declaring the image source and if the graph roam attribute is true or 'scale', the image would move with it

[helgasoft]

using symbol - Demo. Will move ok with pan, not so good for zoom.

[helgasoft]

using map is better - Demo, with a catch - zoom/pan center has to be in both bounding boxes of map and graph. In the example two such center points are in front of eyes and in front of front legs.