ggmap (version 1.3)

ggimage: Plot an image using ggplot2

Description

ggimage is the near ggplot2 equivalent of image.

Usage

ggimage(mat, fullpage = TRUE, verbose = FALSE,
    coord_equal = TRUE)

Arguments

mat

an image object (from e.g. read.jpeg in the ReadImages package)

fullpage

logical; should the image take up the entire viewport?

verbose

logical; message the user?

coord_equal

logical; should the axes units be equal?

Value

• a ggplot object

Examples

img <- matrix(1:16, 4, 4)
image(img)
ggimage(t(img[,4:1]), fullpage = FALSE) +
  scale_fill_gradientn(colours = heat.colors(10), guide = 'none')


data(hadley)
ggimage(hadley, verbose = TRUE)

x <- seq(1, 438, 15); n <- length(x)
df <- data.frame(x = x, y = 120*(scale((x - 219)^3 - 25000*x) + rnorm(n)/2 -3))
qplot(x, y, data = df, geom = c('smooth','point'))
ggimage(hadley, fullpage = FALSE) +
  geom_smooth(aes(x = x, y = y), fill = I('gray60'), data = df,
    colour = I('green'), size = I(1)) +
  geom_point(aes(x = x, y = y), data = df,
    colour = I('green'), size = I(3), fill = NA)