Calculate the distance between a pair of spatial boundaries

## Usage

distance(x, y, measure, time = NULL)

## Arguments

x, y

Objects of the class slendr

measure

How to measure distance? This can be either 'border' (distance between the borders of x and y) or 'center' (distance between their centroids).

time

Time closest to the spatial maps of x and y if they represent slendr_pop population boundaries (ignored for general slendr_region objects)

## Value

If the coordinate reference system was specified, a distance in projected units (i.e. meters) is returned. Otherwise the function returns a normal Euclidean distance.

## Examples

# create two regions on a blank abstract landscape
region_a <- region("A", center = c(20, 50), radius = 20)
region_b <- region("B", center = c(80, 50), radius = 20)
plot_map(region_a, region_b)

# compute the distance between the centers of both population ranges
distance(region_a, region_b, measure = "center")
#> [1] 60

# compute the distance between the borders of both population ranges
distance(region_a, region_b, measure = "border")
#> [1] 20