holoviz/holoviews

Suggesting that by default a Heatmap has no annotations with the Matplotlib backend

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#5,108 opened on Nov 5, 2021

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good first issuetag: backend: mpltag: hvplottype: enhancement

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Description

Annotations don't look good in a Heatmap with a large amount of data and those that are rendered in the high values range are barely visible with the default color map. Heatmaps generated with the Bokeh backend don't have annotations by default.

See this example taken from the reference gallery: image

Contributor guide

Research direction
Examine the Heatmap class to understand how annotations are controlled per backend, and create a pull request to set annotations=False by default for Matplotlib backend when data is large or when it's a heatmap.
Tech stack
python
Domain
data visualization
Issue type
Feature
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.
Half day
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
PythonHoloViews
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65