ggmap (version 0.7)

ggimage: Plot an image using ggplot2...

Description

Plot an image using ggplot2

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

Details

ggimage is the near ggplot2 equivalent of image.

Examples

img <- matrix(1:16, 4, 4)
image(img)
ggimage(t(img[,4:1]), fullpage = FALSE) + 
scale_fill_gradientn(colour = heat.colors(10), legend = FALSE)

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)