Draw multiple polygon on a nativeRaster image

Draw multiple polygon on a nativeRaster image

nr_polygon(nr, x, y, id = NULL, fill = "black", color = NA)

Arguments

nr: nativeRaster
x, y: Vectors of point coordinates
id: integer vector used to separate coordinates into multiple polygons. Consecutive runs of the same id value belong to the same polygon. If NULL (the default) then all coordinates are assumed to be vertices of a single polygon.
fill: fill color
color: Color as a character string. Either a standard R color (e.g. 'blue', 'white') or a hex color of the form #rrggbbaa, #rrggbb, #rgba or #rgb

Original nativeRaster modified in-place

N <- 20
nr <- nr_new(N, N, 'grey80')
nr_polygon(nr, x = c(0, N-1, 0), y = c(0, 0, N-1), fill = 'blue', color = 'red')
plot(nr)