contract_it: Contract polygons in an object

In chrisbrunsdon/caricRture: 'Sketchy' style maps with R

Description

Contract polygons in an object

Usage

contract_it(spdf, r)

Arguments

spdf	A SpatialPolygons or SpatialPolygonsDataFrame object
r	Radius of contraction

Value

A SpatialPolygons object with contraction applied

Examples

"POLYGON ((30 10, 40 40, 20 40, 10 20, 30 10))" %>% readWKT -> p1
dv <- adjustcolor('darkviolet',alpha.f=0.5)
p1 %>% dilate_it(3) %>% plot(col=dv)
p1 %>% plot(col=dv,add=TRUE)

# A sketchy version
p1 %>% contract_it(3) %>% make_canvas %>% sketch_it(col='chocolate')

chrisbrunsdon/caricRture documentation built on May 13, 2019, 6:52 p.m.