ggvoronoi (version 0.8.5)

voronoi_polygon: Voronoi Diagram from Data Frame

Description

Create a Voronoi diagram for analysis or plotting with geom_polygon.

Usage

voronoi_polygon(data, x = "x", y = "y", outline = NULL,
  data.frame = FALSE)

Value

Returns a SpatialPolygonsDataFrame containing the polygon tiles of the nearest neighbor diagram generated by the provided (x,y) coordinates.

Arguments

data

data.frame containing a set of points to make voronoi regions and any additional desired columns.

x

numeric vector (for example longitude).

y

numeric vector (for example latitude).

outline

data.frame with first column x/longitude, second column y/latitude, and a group column denoting islands or pieces.

data.frame

output as data.frame? You will lose information if you do this. For use in StatVoronoi.

Examples

set.seed(45056)
x <- sample(1:200,100)
y <- sample(1:200,100)
points <- data.frame(x, y,
                     distance = sqrt((x-100)^2 + (y-100)^2))
circle <- data.frame(x = 100*(1+cos(seq(0, 2*pi, length.out = 2500))),
                     y = 100*(1+sin(seq(0, 2*pi, length.out = 2500))),
                     group = rep(1,2500))

vor_spdf <- voronoi_polygon(data=points,x="x",y="y",outline=circle)
vor_df <- fortify_voronoi(vor_spdf)

ggplot(vor_df) +
    geom_polygon(aes(x=x,y=y,fill=distance,group=group))