voronoi.polygons: extract polygons from a voronoi mosaic
In tripack: Triangulation of Irregularly Spaced Data

Description Usage Arguments Value Author(s) See Also Examples

This functions extracts polygons from a voronoi.mosaic object.

1	voronoi.polygons(voronoi.obj)

voronoi.obj

object of class voronoi.mosaic

Returns an object of class voronoi.polygons with unamed list elements for each polygon. These list elements are matrices with columns x and y.

Denis White

plot.voronoi.polygons,voronoi.mosaic

##---- Should be DIRECTLY executable !! ----
##-- ==>  Define data, use random,
##--	     or do  help(data=index)  for the standard data sets.

data(tritest)
tritest.vm <- voronoi.mosaic(tritest$x,tritest$y)
tritest.vp <- voronoi.polygons(tritest.vm)
tritest.vp

[[1]]
             x          y
[1,] 0.5000000  0.3062500
[2,] 0.2392857  0.1107143
[3,] 0.5000000 -0.7583333
[4,] 0.7607143  0.1107143

[[2]]
              x         y
[1,]  0.3062500 0.5000000
[2,]  0.1107143 0.7607143
[3,] -0.7583333 0.5000000
[4,]  0.1107143 0.2392857

[[3]]
             x         y
[1,] 0.8892857 0.7607143
[2,] 0.6937500 0.5000000
[3,] 0.8892857 0.2392857
[4,] 1.7583333 0.5000000

[[4]]
             x         y
[1,] 0.5000000 1.7583333
[2,] 0.2392857 0.8892857
[3,] 0.5000000 0.6937500
[4,] 0.7607143 0.8892857

[[5]]
             x         y
[1,] 0.5000000 0.5000000
[2,] 0.5000000 0.5000000
[3,] 0.3062500 0.5000000
[4,] 0.1107143 0.2392857
[5,] 0.2392857 0.1107143
[6,] 0.5000000 0.3062500

[[6]]
             x         y
[1,] 0.7607143 0.1107143
[2,] 0.5000000 0.3062500
[3,] 0.5000000 0.5000000
[4,] 0.6937500 0.5000000
[5,] 0.8892857 0.2392857

[[7]]
             x         y
[1,] 0.6937500 0.5000000
[2,] 0.5000000 0.5000000
[3,] 0.5000000 0.5000000
[4,] 0.5000000 0.6937500
[5,] 0.7607143 0.8892857
[6,] 0.8892857 0.7607143

[[8]]
             x         y
[1,] 0.1107143 0.7607143
[2,] 0.2392857 0.8892857
[3,] 0.5000000 0.6937500
[4,] 0.5000000 0.5000000
[5,] 0.3062500 0.5000000

attr(,"class")
[1] "voronoi.polygons"