Package index • wkpool

Build a pool

Decompose any wk-handleable geometry into a shared vertex pool and segments that reference it, or assemble a pool from tables.

Accessors for the vertices, segments and feature structure of a pool, CRS handling, wk handlers, and plotting.

pool_vertices() pool_segments() pool_feature() pool_path() pool_paths(): Access components of a wkpool object
wk_crs(<wkpool>) wk_set_crs(<wkpool>) wk_is_geodesic(<wkpool>) wk_set_geodesic(<wkpool>): CRS and geodesic handling for wkpool
wk_handle(<wkpool>): Handle wkpool objects with wk handlers
plot(<wkpool>): Plot a wkpool object
plot(<wkpool_tri>): Plot a triangle pool

Coincident vertex detection and merging (with optional periodic x for the antimeridian), and topology diagnostics.

merge_coincident(): Merge coincident vertices in a pool
topology_report(): Report topology diagnostics
vertex_degree(): Calculate vertex degree (number of segments touching each vertex)

Edges used by more than one feature, internal boundaries, and feature adjacency.

find_shared_edges(): Find shared edges between features
find_internal_boundaries(): Find internal boundaries (edges shared by exactly 2 features, opposite direction)
find_neighbours(): Build adjacency from shared edges

Arc-node topology, maximal segment runs between nodes of degree other than two.

Closed rings in the segment graph, classified by winding into outer rings and holes.

find_cycles(): Find closed cycles (rings) in segment graph
classify_cycles(): Classify cycles as outer rings or holes based on winding
cycle_signed_area(): Calculate signed area of a cycle
reverse_cycle(): Reverse a cycle's winding direction

Triangle pools that share the vertex pool, and the inputs constrained triangulators need (holes, PSLG). This interface may change.

pool_triangulate(): Triangulate the polygons in a pool
new_wkpool_tri(): Construct a triangle pool
pool_triangles() tri_segments() wk_handle(<wkpool_tri>): Access the triangles of a triangle pool
pool_holes() hole_points(): Get hole points for constrained triangulation
as_pslg(): Convert wkpool to a PSLG (planar straight line graph)

Back to WKT or WKB, as segments, arcs or polygons from cycles.