extract info about voronoi cells

This function returns some info about the cells of a voronoi mosaic, including the coordinates of the vertices and the cell area.

cells(voronoi.obj)

Arguments

voronoi.obj

object of class voronoi

Details

The function calculates the neighbourhood relations between the underlying triangulation and translates it into the neighbourhood relations between the voronoi cells.

Value

retruns a list of lists, one entry for each voronoi cell which contains

cell

cell index

center

cell 'center'

neighbours

neighbour cell indices

nodes

2 times nnb matrix with vertice coordinates

area

cell area

Author

A. Gebhardt

Note

outer cells have area=NA, currently also nodes=NA which is not really useful – to be done later

See also

voronoi.mosaic, voronoi.area

Examples

data(tritest)
tritest.vm <- voronoi.mosaic(tritest$x,tritest$y)
tritest.cells <- cells(tritest.vm)
# higlight cell 12:
plot(tritest.vm)
polygon(t(tritest.cells[[12]]$nodes),col="green")
# put cell area into cell center:
text(tritest.cells[[12]]$center[1],
     tritest.cells[[12]]$center[2],
     tritest.cells[[12]]$area)