ggimage: Plot an image using ggplot2

Description Usage Arguments Value Author(s) Examples

Description

ggimage is the near ggplot2 equivalent of image.

Usage

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

Arguments

mat

a matrix, imagematrix, array, or raster (something that can be coerced by as.raster)

fullpage

should the image take up the entire viewport?

coord_equal

should the axes units be equal?

scale_axes

should the axes be [0,ncol(mat)-1]x[0,nrow(mat)-1] (F) or [0,1]x[0,1] (T)

Value

a ggplot object

Author(s)

David Kahle david.kahle@gmail.com

Examples

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img <- matrix(1:16, 4, 4)
image(img)
ggimage(t(img[,4:1]), fullpage = FALSE, scale_axes = TRUE)
ggimage(t(img[,4:1]), fullpage = FALSE)


## Not run: 
# not run due to slow performance

data(hadley)
ggimage(hadley)
ggimage(hadley, coord_equal = FALSE)

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)


## End(Not run)

ggmap documentation built on May 1, 2019, 8:22 p.m.