Added a three-level grouped layout engine via explode_grouped(), supporting "auto", "auto_collision", and "manual" anchor modes for multi-region and national-scale layouts.
Added layout_regions() to compute region anchors as a standalone step for custom grouped-layout workflows.
Added estimate_block_radii() to estimate per-region block radii using the 85th percentile of unit-to-centroid distances.
Added export_topojson() for optional TopoJSON export via the external mapshaper CLI tool, for downstream tools such as Power BI.
Added summary.grouped_exploded_map() for grouped-layout diagnostics, including local displacement parameters, anchor parameters, and block radii.
Added optional bounded collision refinement to explode_sf() and explode_state() for dense municipal cores, with diagnostics stored in the returned refinement component.
Improvements
Centroid handling was refactored throughout the package to avoid sf attribute warnings during centroid calculations.
compute_stats() now accepts centroid_fun so geometry statistics and displacement use the same centroid semantics.
explode_sf() and explode_state() now respect partial manual overrides: users may set only alpha_r or only alpha_l while deriving the other parameter from geometry.
Direction vectors and distance scaling now handle true zero-distance cases without suppressing sub-metre coordinate differences.
Grouped anchor collision refinement is now deterministic for coincident anchors, improving reproducibility.
Manual grouped anchors now validate that every region has one anchor and that regions are not duplicated in the anchor table.
Grouped objects now inherit from both grouped_exploded_map and exploded_map, improving method consistency.
Grouped S3 methods were consolidated and cleaned up for more consistent printing, plotting, and summary output.
Distance formatting in diagnostic output now adapts between metres and kilometres, improving readability for both small synthetic examples and real-world datasets.
Focus maps now support non-blocking info cards, selected-area sizing controls, and denser-layer performance tuning for Shiny workflows.
validate_input() now returns visibly, making repaired geometries less fragile in internal workflows.
Documentation
Added three vignettes: getting started, grouped layouts, and paper replication.
Added small installed examples for the basic sf workflow, optional collision refinement, lookup-table grouping, and manual parameter tuning.
Added a workflow-selection vignette and a site-linked cheatsheet for release-oriented user guidance.
Added an inst/CITATION entry for academic citation.
Added pkgdown site configuration and GitHub Pages support.
explodemap 0.1.0
Initial release
Added the core two-level displacement engine for exploded-view cartography of dense administrative boundary data.
