gglocator: Locator for ggplots.
In KimByoungmo/modefiedggmap: Spatial Visualization with ggplot2

Description Usage Arguments Value Author(s) Examples

Locator for ggplots. (Note : only accurate when extent = "normal" when using ggmap.)

1	gglocator(n = 1, message = FALSE, xexpand = c(0, 0), yexpand = c(0, 0))

`n`	number of points to locate.
`message`	turn messaging from grid.ls on/off
`xexpand`	expand argument in scale_x_continuous
`yexpand`	expand argument in scale_y_continuous

a data frame with columns according to the x and y aesthetics

Tyler Rinker with help from Baptiste Auguie and StackOverflow user DWin with additions and canning by David Kahle david.kahle@gmail.com. Updated by \@Nikolai-Hlubek

if(interactive()){

# only run for interactive sessions


df <- expand.grid(x = 0:-5, y = 0:-5)
(p <- qplot(x, y, data = df) +
  annotate(geom = 'point', x = -2, y = -2, colour = 'red'))
gglocator()

p +
  scale_x_continuous(expand = c(0,0)) +
  scale_y_continuous(expand = c(0,0))
gglocator(1, xexpand = c(0,0), yexpand = c(0,0))


}