plotly / plotly/plotly.py

Transparent markers misbehaving in plotly.express.scatter

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bug P3
Dominant language
Python
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Avg merge
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Merged PRs (30d)
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Description

Description

I create a scatter plot and use the color and size arguments. One subset gets transparent markers and is not visible in the plot and the legend.

But: if I hover over an area, where a marker should be, the tool tip is appearing, see figure below:

image

Expected Behavior

Marker should be visible in plot and legend.

Reproduction

Running the code below I get the figure above.

# %%
# Imports

import sys
import plotly
import pandas as pd
import plotly.express as px

print(f'Python version: {sys.version}')  # Mine is: 3.11.9
print(f'Pandas version: {pd.__version__}')  # Mine is: 2.2.2
print(f'Plotly version: {plotly.__version__}')  # Mine is: 5.22.0

# %%
# Create input frame

df = pd.DataFrame(
  [
    [11739,21.329416,10.010795,2,1],
    [20500,21.860714,12.238669,2,2],
    [1504,21.927166,10.314574,2,1],
    [28194,21.257576,12.823945,2,3],
    [9008,21.886381,9.579169,2,1],
    [17073,21.57327,11.087076,2,1],
    [40734,21.069445,11.887547,3,0],
    [36405,22.397081,11.608735,3,0],
    [36919,21.95463,12.856195,3,0],
    [9867,20.893126,10.761697,2,1]
  ],
  columns=['id' ,'x', 'y', 'loop_number', 'repetition']
)

df.set_index('id', inplace=True)

df.x = df.x.astype('float32')
df.y = df.y.astype('float32')
df.loop_number = df.loop_number.astype('category')  # As category to use color labels, not a color bar.
df.repetition = df.repetition.astype('int32')

df.head()

# %%
# Create Scatter Plot

px.scatter(
  df,
  x='x',
  y='y',
  color='loop_number',
  size='repetition',
  labels={
    'color': 'Type',
    'size': 'Size'
  },
  hover_name=df.index
)

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Run the provided Python reproduction through plotly.express.scatter with color='loop_number' and size='repetition'. Inspect why the transparent subset is omitted from both the plot and legend despite remaining hoverable; done means that subset's markers and legend entry are visible while preserving the reported scatter behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
pandas, python
Domain
data-visualization
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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