Skip to contents

Export a map in PNG format

Source: R/mf_png.R
mf_png.Rd

Export a map with the extent of a spatial object in PNG format.

PNG is a raster graphics file format and PNG export should be used for maps that do not require further modification.

If width is specified, then height is deduced from the width/height ratio of x. Alternatively, if height is specified, then width is deduced from the width/height ratio of x. This helps to produce maps without too much wasted space.

Use dev.off to finish the export (see Examples).

Usage

mf_png(
  x,
  filename = "map.png",
  width,
  height,
  expandBB = rep(0, 4),
  res = 96,
  ...
)

Arguments

x

object of class sf, sfc or SpatRaster

filename

path to the exported file

width

width of the figure (pixels)

height

height of the figure (pixels)

expandBB

fractional values to expand the bounding box with, in each direction (bottom, left, top, right)

res

nominal resolution in ppi

...

further parameters

Value

No return value, a PNG device is initiated.

Examples

mtq <- mf_get_mtq()
(filename <- tempfile(fileext = ".png"))
#> [1] "/tmp/RtmpViEc0z/file423075ed0aa7b.png"
mf_png(mtq, filename = filename)
mf_map(mtq)
mf_title()
dev.off()
#> agg_record_417357845 
#>                    2