[Octave-bug-tracker] [bug #58282] Missing plot properties 'MarkerFaceAlpha' and 'MarkerEdgeAlpha' in the scatter function

[Markus Mützel]

Update of bug #58282 (project octave):

              Item Group:         Feature Request => Matlab Compatibility   

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Follow-up Comment #6:

Thank you for the review.

The attached patch includes the necessary changes in "struct2hdl.m" to load
.fig files with scatter objects.

It also adds some initial logic to support "cdatamode" "auto". For this to
work correctly, it is necessary to create each scatter object with an
incrementing integer value in "seriesindex". I'm not sure yet how to best
implement this. It is probably necessary to make some changes in the axes
object so that it can keep track of how many scatter objects it adopted.

The patch also makes some more changes to the documentation.

I also added a BIST to scatter that currently fails. So some more changes are
still needed.

I don't know why printing the transparent markers works differently from e.g.
faces of patches or surfaces. I re-used the marker drawing function
"opengl_renderer::draw_marker" that we already had and only passed an
additional, forth value (alpha) to the color definitions.
The markers seem to call a display list. That is different from how e.g.
patches are drawn. I'm not sure if this makes a difference when printing.
The display lists for the markers include drawing them using GL_POLYGON for
the faces and GL_LINE_LOOP for the outline.
The faces of surface objects are drawn using GL_QUAD, and a tesselator is used
for the patch objects.
I'm not sure if any of this helps.

(file #49036)
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Additional Item Attachment:

File name: bug58282_scatter_v3.patch      Size:65 KB
    <https://savannah.gnu.org/file/bug58282_scatter_v3.patch?file_id=49036>



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