plotly/plotly.py

[BUG]: TOZEROY FILL IS FILLING AREAS OF THE PLOT THAT HAS NO DATA IN IT

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#5,632 opened on Jun 22, 2026

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 (7 comments) (0 reactions) (0 assignees)Python (2,467 forks)batch import
P2buggood first issuegood for agentsize: 3

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Description

So, I have currently implemented the tozeroy fill (the area under the curve) to a feature in one of the datasets I'm working with When I set the fill the tozeroy, it fills under the areas of the plot that currently have no data in it, tozeroy currently joins a polygon from the bottom edge of a point that has data to the top of another edge that has data in it to cover that empty data trace section. When I set the fill to 'none', plotly obeys the rule of not covering for the spots that has no data in it as shown in the picture below The areas I circled is where the problem lies as shown in the picture below

Thank you

Contributor guide

Research direction
Examine the tozeroy fill implementation in plotly.py to understand how it connects datapoints and determine why it fills gaps without data.
Tech stack
python
Domain
frontend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Plotly basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75