It seems one now needs to specify the marker edge color.
This might have to do with the upgrade to matplotlib 2.2.2
in [Sage Trac ticket 25702](https://trac.sagemath.org/ticket/25702).
One can discover the existence of the optional argument `markeredgecolor`
by reading the documentation for `point` then for `point2d`.
Below, we recap the example in the question, with this novelty.
Plot the segments.
sage: p1 = plot(2*x, x, 0, 1)
sage: p2 = plot(-x+3, x, 1, 2)
sage: p3 = plot(-(x-3)^3+2, x, 2, 3)
The filled in points.
sage: pt1 = point((0, 0), rgbcolor='black', pointsize=30)
sage: pt3 = point((1, 3), rgbcolor='black', pointsize=30)
sage: pt4 = point((2, 1), rgbcolor='black', pointsize=30)
sage: pt6 = point((3, 2), rgbcolor='black', pointsize=30)
The outlined but not filled in points.
sage: pt2 = point((1, 2), rgbcolor='white', faceted=True,
markeredgecolor='red', pointsize=30)
sage: pt5 = point((2, 3), rgbcolor='white', faceted=True,
markeredgecolor='red', pointsize=30)
Combine all the above.
sage: (p1+p2+p3+pt1+pt2+pt3+pt4+pt5+pt6).show(xmin=0, xmax=3, ymin=0,
ymax=3)
Launched png viewer for Graphics object consisting of 10 graphics
primitives
To explore the documentation or the code for `point` and `point2d`, do:
sage: point?
sage: point??
sage: point2d?
sage: point2d??
or
sage: sage.plot.point.point?
sage: sage.plot.point.point??
sage: sage.plot.point.point2d?
sage: sage.plot.point.point2d??
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