feat: add DensityMap trace for the MapLibre map subplot#416
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jqnatividad wants to merge 4 commits into
Open
feat: add DensityMap trace for the MapLibre map subplot#416jqnatividad wants to merge 4 commits into
jqnatividad wants to merge 4 commits into
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Add choropleth map support (addresses plotly#408): - `Choropleth<Loc, Z>` on the existing `geo` subplot, with a `LocationMode` enum (ISO-3 / USA-states / country names / geojson-id), a dedicated `choropleth::Marker`, selection support, z-bounds, and the shared `ColorScale`/`ColorBar` machinery. `geojson` accepts a URL string or an inline GeoJSON object. - `ChoroplethMap<Loc, Z>`, the plotly.js 3.x `choroplethmap` trace on the MapLibre `map` subplot (GeoJSON-only). - New MapLibre `map` subplot via `LayoutMap` + `MapStyle` + `MapBounds`. - `LayoutGeo` additions: `fitbounds` (`GeoFitBounds`), `resolution` (`GeoResolution`, 1:110M/1:50M base-layer detail), and `bgcolor`. - `PlotType::Choropleth`/`ChoroplethMap` variants, re-exports, serialization tests, doctests, runnable `examples/maps` examples, and a Maps book recipe. Attribute names/types follow the plotly.js v3.6.0 plot-schema. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The embedded choropleth example calls GeoResolution::OneOverFiftyMillion, but the shared import block omitted GeoResolution, so copying the documented imports alongside the example would not compile. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Add the modern MapLibre-based `densitymap` trace type, the density counterpart to `ChoroplethMap`. It draws a weighted kernel-density heatmap from lat/lon points (optional per-point weight z) onto the `layout.map` subplot, with full color-scale (colorscale, colorbar, showscale, reversescale, autocolorscale, coloraxis, zmin/zmax/zmid) and hover (text, hovertext, hoverinfo, hovertemplate, hoverlabel, customdata) support. Unlike ChoroplethMap it has no marker/selection. Registers the trace: DensityMap variant on PlotType (serializes to "densitymap"), module + type re-exports in traces/mod.rs and lib.rs. Includes a serialize_density_map unit test and a doctest. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This was referenced Jul 5, 2026
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Summary
plotly.rs has
ChoroplethMapfor the modern MapLibremapsubplot (layout.map), but no density-heatmap trace for it. plotly.js providesdensitymapas the MapLibre-based successor to the (Mapbox-based, now deprecated)densitymapbox. This PR adds a matchingDensityMapRust trace.Closes #414.
DensityMapis drawn on the MapLibremapsubplot introduced in #410, so this PR is stacked on top of #410 and should be reviewed/merged after it. Until #410 merges, the diff here also shows #410's commits; once #410 lands inmain, this diff reduces to just theDensityMapaddition. (Depends on #410.)What changed
New
DensityMap<Lat, Lon, Z>trace mirroringChoroplethMap's structure with a density data model (nomarker/selected/unselected— density traces have none):lat,lon,z(per-point weight),radius,opacityzauto,zmin/zmax/zmid,colorscale,autocolorscale,reversescale,showscale,colorbar,coloraxistext,hovertext,hoverinfo,hovertemplate,hovertemplatefallback,hoverlabelsubplot(defaults to"map"),below,ids,meta,customdata,uirevisionRegistration: a
DensityMapvariant onPlotType(serializes to"densitymap"), plus module/type re-exports intraces/mod.rsandlib.rs. Includes aserialize_density_mapunit test and a doctest.Testing
cargo test -p plotly—serialize_density_mapand its doctest pass.cargo clippy --features all -- -D warnings -A deprecated— clean.cargo +nightly fmt --all -- --check— clean.🤖 Generated with Claude Code