st_viewport {sf}

Create viewport from sf, sfc or sfg object

Description

Create viewport from sf, sfc or sfg object

Usage

st_viewport(x, ..., bbox = st_bbox(x), asp)

Arguments

x

object of class sf, sfc or sfg object

...

parameters passed on to viewport

bbox

the bounding box used for aspect ratio

asp

numeric; target aspect ratio (y/x), see Details

Details

parameters width, height, xscale and yscale are set such that aspect ratio is honoured and plot size is maximized in the current viewport; others can be passed as ...

If asp is missing, it is taken as 1, except when isTRUE(st_is_longlat(x)), in which case it is set to 1.0 /cos(y), with y the middle of the latitude bounding box.

Value

The output of the call to viewport

Examples

library(grid)
nc = st_read(system.file("shape/nc.shp", package="sf"))
grid.newpage()
pushViewport(viewport(width = 0.8, height = 0.8))
pushViewport(st_viewport(nc))
invisible(lapply(st_geometry(nc), function(x) grid.draw(st_as_grob(x, gp = gpar(fill = 'red')))))