Access the triangles of a triangle pool

Usage

pool_triangles(x)

tri_segments(x)

# S3 method for class 'wkpool_tri'
wk_handle(handleable, handler, ...)

Arguments

x: A wkpool_tri.
handleable: A wkpool_tri.
handler: A wk handler.
...: Passed on.

Value

pool_triangles(): a data frame with columns .vx0, .vx1, .vx2 and, when present, .feature and .part.
tri_segments(): a wkpool() of the triangle edges, three per triangle in triangle order and counter-clockwise, on the same vertex pool, with the triangle's feature. Edges used by one triangle are on the boundary of the triangulated region, edges used by two are internal (after merge_coincident(), so that adjacent triangles share vertex ids).

Details

A wkpool_tri is wk-handleable: it presents as one POLYGON per triangle (the handled vector has the same length as the triangle vector), with the pool's crs and geodesic flag attached.

Examples

v <- data.frame(.vx = 1:4, x = c(0, 1, 1, 0), y = c(0, 0, 1, 1))
tri <- new_wkpool_tri(v, vx0 = c(1L, 1L), vx1 = c(2L, 3L), vx2 = c(3L, 4L))
pool_triangles(tri)
#>   .vx0 .vx1 .vx2
#> 1    1    2    3
#> 2    1    3    4
tri_segments(tri)
#> <wkpool[6 segments, 4 vertices]>
#> [1] <segment: 1->2> <segment: 2->3> <segment: 3->1> <segment: 1->3>
#> [5] <segment: 3->4> <segment: 4->1>