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explodemap 0.2.0

New features

• 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.
• Added explode_section() for drill-down dashboards that explode one selected section while keeping the remaining geography as faded or hidden context for focus_map().

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.
• Focus maps now support named group_palette values, allowing Shiny apps to align widget colouring with dashboard legends or domain-specific palettes.
• Focus maps now support context features via context_col, context_mode, context_opacity, and context_clickable, enabling selected-region focus maps with muted background geography.
• Focus maps now support adaptive tiny-feature focus controls via min_focus_width, min_focus_height, tiny_feature_threshold, and tiny_feature_boost, improving municipal drill-down maps with very small selected polygons.
• Focus maps now support selected-feature origin context via origin_context and origin_context_position, including an overview inset that keeps small municipal focus views anchored to the broader geography. The cue is opt-in by default.
• Focus maps now expose focus_context_opacity to tune how strongly the non-selected background geography recedes during focused views.
• Focus maps now support opt-in drag zoom via show_drag_zoom. Users can use the button or Shift-drag to draw a marquee rectangle and smoothly zoom into dense clusters before selecting individual features.
• Drag zoom behaves as a navigation layer over focus maps: plain clicks still focus polygons while the toggle is active, and turning the tool off no longer resets the current focus.
• explode_grouped() now accepts visual aliases (anchor_expand, anchor_buffer, density_scale, and block_sep) for the corresponding grouped-layout solver controls.
• Shiny workflows now have quieter geometry builders, automatic plot suppression safeguards, and selection events for linked side panels.
• Public-facing dashboard examples now show clear Shiny validation messages for failed boundary downloads, empty data, map-generation failures, and widget-rendering failures.
• TIGER/Line downloads and TopoJSON export now fail with clearer, actionable error messages when external services, files, or tools are unavailable.
• 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 for release-oriented user guidance.
• Added Shiny-oriented guidance for exploding a visible section while preserving the rest of the map as context in focus_map().
• 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.
• Added three public entry points: explode_sf(), explode_sf_with_lookup(), and explode_state().
• Added analytical parameter derivation via derive_params(), implementing Analytical Results 1 and 2.
• Added geometry statistics via compute_stats().
• Added the exploded_map S3 class with print(), plot(), and summary() methods.
• Added calibration_row() for cross-dataset calibration tables.
• Added TIGER/Line download and caching support via explode_state().
• Added a state registry with New Jersey, Pennsylvania, Ohio, and New York configurations.
• Added example workflows for cross-state calibration, Canada validation, and HHS grouped layouts.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.