Performance: Render dense lines as bands - #260
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Sep 22, 2026
Add `BandShape` to epaint, supporting and varying width band along some direction. This can be useful in egui_plot, e.g. for filling the area under a curve, or for visualizing a audio waveform, for instance. The band has feathering for the fill, plus an optional stroke that is just drawn on top of the fill. This solves a small subset of non-convex polygons (since the general solution is quite difficult, at least if you want feathered edges). <img width="493" height="180" alt="Screenshot 2026-09-01 at 20 56 33" src="https://github.com/user-attachments/assets/f79ae9bc-3512-4c87-b166-d1240a8dd3e4" /> Includes an interactive waveform demo and alpha screenshot coverage. Related work: - #513 - emilk/egui_plot#260 --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Resolve conflicts: * `Cargo.toml`: point the `egui` patch at `main` (the band-shape work has landed there) * `Cargo.lock`: take `main`, then update the `egui` git deps * `series.rs`: keep the existing `Color32` import and drop the now-unused `Id` Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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BandShapeegui#8476Agreggate high-resolution plot line series into varying-width "bands".
This greatly lessens the load on the egui tessellator.
In the benchmark I added in #258: