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Discussion: add title to multiple colorbars? #361

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Discussion: add title to multiple colorbars?#361
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@LucaMarconato
LucaMarconato
opened on Sep 27, 2024
##
from spatialdata.datasets import blobs
import spatialdata_plot
import matplotlib.pyplot as plt

sdata = blobs()
sdata['blobs_polygons']['column'] = 0

(
    sdata.pl.render_images('blobs_image')
    .pl.render_shapes('blobs_circles', color='radius')
    .pl.render_shapes('blobs_polygons', color='column')
    .pl.show()
)
plt.show()

gives
image
Which looks great! But it may be confusing to know which colorbar refers to what. I would consider one of the following:

  1. we leave it as it is: the user should use different colorbars (e.g. viridis + gray) when plotting multiple elements at the same time, so the ambiguity doesn't exist
  2. we add a title on top of the colorbar to make clear what the colorbar refers to
  3. we show only one colorbar maximum.

I prefer having multiple colorbar, so I'd choose either 1 or 2. @timtreis @Sonja-Stockhaus wdyt?

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  1. LucaMarconato
    added
    🗣️ discussionNeeds further discussion
    on Sep 27, 2024

  2. timtreis commented on Sep 27, 2024

    @timtreis
    timtreis
    on Sep 27, 2024
    Member

    Don't like 3) either.

    Vaguely related to #349 in which I have to refactor the entire logic anyway. One option would be to add cbar_title to the individual calls

  3. timtreis commented on Mar 29, 2026

    @timtreis
    timtreis
    on Mar 29, 2026
    Member

    Now possible with #518

    from spatialdata.datasets import blobs
import spatialdata_plot
import matplotlib.pyplot as plt

sdata = blobs()
sdata["blobs_polygons"]["column"] = range(len(sdata["blobs_polygons"]))

# Default: column name becomes colorbar label automatically
(
      sdata.pl.render_images("blobs_image")
      .pl.render_shapes("blobs_circles", color="radius")
      .pl.render_shapes("blobs_polygons", color="column")
      .pl.show()
)
    Image 
    # Custom labels via colorbar_params
(
      sdata.pl.render_images("blobs_image")
      .pl.render_shapes("blobs_circles", color="radius", colorbar_params={"label": "Circle radius"})
      .pl.render_shapes("blobs_polygons", color="column", colorbar_params={"label": "Polygon ID"})
      .pl.show()
)
    Image
  4. timtreis
    closed this as completedon Mar 29, 2026
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