Convert an image file to a polygon

Usage

letterToPolygon(
  ch,
  fontfamily = "Helvetica",
  fontsize = 576,
  tol = 1,
  dim = c(480, 480),
  threshold = 0.5,
  var = "red"
)

Arguments

ch: letter
fontfamily: R has a few default fonts that are always available, such as e.g. Helvetica, Arial, Courier New, and Garamond. Other fonts might be available depending on the platform used.
fontsize: by default 576. If the resulting string exceeds the boundary of the matrix returned, reduced font size
tol: tolerance
dim: vector of length two specifying width and height (in pixels) of the temporary jpg file created for the letter. Defaults to 480 x 480 pixels.
threshold: numerical cutoff between 0 and 1
var: one of "red", "green", "blue".

Examples

library(ggplot2)
letter <- letterToPolygon("R", fontfamily="Helvetica")
qplot(x, y, geom="polygon", data = letter, fill=I("black"), alpha=I(0.8))+
     coord_equal()