Reads the position of the graphics cursor when the (first) mouse button is pressed.
locator(n = 512, type = "n", ...)
- the maximum number of points to locate. Valid values start at 1.
- One of
"o"the points are plotted; if
"o"they are joined by lines.
- additional graphics parameters used if
type != "n"for plotting the locations.
Unless the process is terminated prematurely by the user (see below) at most
n positions are determined.
The current graphics parameters apply just as if
plot.default has been called with the same value of
type. The plotting of the points and lines is subject to clipping, but locations outside the current clipping rectangle will be returned.
If the window is resized or hidden and then exposed before the input process has terminated, any lines or points drawn by
locator will disappear. These will reappear once the input process has terminated and the window is resized or hidden and exposed again. This is because the points and lines drawn by
locator are not recorded in the device's display list until the input process has terminated.
A list containing
y components which are the coordinates of the identified points in the user coordinate system, i.e., the one specified by
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
dev.capabilities to see if it is supported.
Documentation reproduced from R 3.0.2. License: GPL-2.