How does Pluto decide what to show graphically?

[rikh]

@rpmuller

The latter appears to be called to display objects in Pluto notebooks. How do I control when the MIME"image/svg+xml" is displayed?

As far as I understand, the MIME types state how the browser shows the output data. So, for an object of type T, it doesn’t make sense to define two different output MIME types.

@rpmuller

For example, does Pluto default by trying to show the object as an image, and then fall back to showing it as html?

See the documentation of show via ?show. It depends on the type of the third parameter (the object). The behavior is not really Pluto specific. Pluto just calls show(io, mime, x) and Julia calls the most applicable show method.

@rpmuller

For the record, what I tried to do with the SVG string was to define the SVG string:

txtsvg = """<svg height="100" width="100">
  <circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
</svg>"""

and to then call

Show(MIME"image/svg+xml"(),txtsvg)

The type of textsvg is a string, so show(io, mime, obj::String) will be called. Instead, you could define your own type

struct MySVG
   x::String
end

and your own show method

function show(io::IO, m::MIME"image/svg+xml", obj::MySVG)
    [...]
end