Fixed line is drawn wrongly after zoom and pan
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bug
P3
- Dominant language
- Python
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Description
I experience strange behavior when I zoom and pan in a simple logarithmic scatter plot:
A fixed line, drawn from (0,0) to (100,100), “jumps” to a wrong position after zooming and panning.
Tested on Windows 10, with Plotly 5.0.0, using Python 3.9.
Test code:
import math
import pandas as pd
import plotly.express as px
df = pd.DataFrame([
[30, 30],
[70.0, 70.0]
],
columns=['length', 'width'])
fig = px.scatter(df,
x="length",
y="width",
log_x=True,
log_y=True)
fig.update_xaxes(range=[0, math.log10(100*1.1)])
fig.update_yaxes(range=[0, math.log10(100*1.1)])
fig.add_shape(type="line", x0=0.0, y0=0.0, x1=100, y1=100)
fig.show()

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First steps
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- Open a pull request that references the issue number.
Research direction
Run the supplied Python example with Plotly 5.0.0 and reproduce the line’s position before and after zooming and panning. Trace how logarithmic axes and the added shape are transformed, then verify that the fixed line remains aligned with the plotted coordinates after interaction.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- plotly, python
- Domain
- data-visualization
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 55/100