SVG not displaying scatter output

[cphalpert]

ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

Bokeh: 1.0.1
IPython: 6.5.0

Description of expected behavior and the observed behavior

I expect the chart below to contain both navy and red circles. The red circles are displayed, but the navy circles created by the .scatter method do not appear.

Complete, minimal, self-contained example code that reproduces the issue

from bokeh.plotting import figure, show
from bokeh.io.export import get_svgs
from IPython.display import SVG

p = figure(plot_width=400, plot_height=400)
p.scatter([-1, -2, -3, -4, -5], [6, 7, 2, 4, 5], size=20, color="navy", alpha=0.5, marker='circle')
p.circle([1, 2, 3, 4, 5], [6, 7, 2, 4, 5], size=20, color="red", alpha=0.5)
p.output_backend = 'svg'
# show the results
SVG(get_svgs(p)[0])

Screenshots or screencasts of the bug in action

[mattpap]

Seems to be a problem with all circle-type markers and scatter():

Code to reproduce:

from bokeh.plotting import figure
from bokeh.io import save
from bokeh.layouts import row, column
from bokeh.core.enums import MarkerType as markers

def mkplot(marker, backend):
    p = figure(plot_width=300, plot_height=300, title="%s - %s" % (marker, backend))
    p.output_backend = backend
    p.toolbar_location = None
    p.scatter([-1, -2, -3, -4, -5], [6, 7, 2, 4, 5], size=20, color="navy", alpha=0.5, marker=marker)
    getattr(p, marker)([1, 2, 3, 4, 5], [6, 7, 2, 4, 5], size=20, color="red", alpha=0.5)
    return p

def mkplots(marker):
    return row(mkplot(marker, "canvas"), mkplot(marker, "svg"))

p = column([ mkplots(marker) for marker in markers ])
save(p)

[mattpap]

There are errors in JS console:

canvas2svg.js:536 Attempted to apply path command to node g
(...)

(hidden when using get_svgs() or export_svgs()). This may indicate a bug in the underlying library canvas2svg. The unfortunate part is that this library isn't maintained anymore, so we may need to fork it and fix things on our own.

[kawairine]

Hi,

I also ran into this problem, and I was wondering if there is a quick solution to this?

Thank you.

[bryevdv]

@kawairine I am afraid there is not. As mentioned above, Bokeh SVG output capability depends on a third party library and that library is no longer maintained at all. We will have to either re-do all of the SVG functionality, or find and integrate another new library that is maintained, or take ownership of the existing dependency. All of those are fairly heavy-lift tasks. I can't speculate when they might be gotten to with the current core team. We could really use help from new contributors to improve this situation faster.

[github-actions]

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