enh: Add offset to Area.stack for streamgraphs - #6961
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Area.stack could only produce a flat zero baseline, so there was no way to draw a streamgraph in HoloViews. Add an offset argument accepting 'zero', 'sym', 'wiggle' and 'weighted_wiggle', reusing the baseline vocabulary and formulas from matplotlib.stackplot. No backend changes are needed. All three AreaPlot implementations already fill between the two value dimensions without clamping at zero, so a shifted baseline renders correctly on bokeh, matplotlib and plotly.
ghostiee-11
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July 21, 2026 11:00
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #6961 +/- ##
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Coverage 89.34% 89.35%
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Files 344 344
Lines 74650 74696 +46
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+ Hits 66696 66742 +46
Misses 7954 7954 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Description
Adds
offsettoArea.stack, mirroringstackplot'sbaseline={'zero', 'sym', 'wiggle', 'weighted_wiggle'}.wigglegives a streamgraph.Before
After
AI Disclosure
Tool & Model: Claude Code + Opus 4.8
Usage: scaffolded the tests and the matplotlib comparison script
I have tested all AI-generated content in my PR.
I take responsibility for all AI-generated content in my PR.
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