matplotlib / matplotlib/mplfinance

Feature Request: HLines on AddPlot

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enhancement
Dominant language
Python
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Forks
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Description

Is it possible to implement hlines (and vlines) for addplots. Right now they’re only available on the primary panel.

The vlines functionality might require a bit more thought as it seems more intuitive that the vlines would slice through all the charts vertically. But I suppose an easy work around would just be the draw the same vertical line on the main plot and addplot for now.

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

Start by tracing how addplots are handled and how the existing primary-panel hlines and vlines support is implemented. Determine whether hlines should apply independently to addplots and whether vlines should span all charts or be repeated per panel; done means the chosen behavior works for addplots and is covered by appropriate plotting tests.

Written by the indexing model from the issue text.

Assessment

Tech stack
matplotlib, python
Domain
data-visualization
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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