| # File src/library/grid/R/interactive.R |
| # Part of the R package, https://www.R-project.org |
| # |
| # Copyright (C) 1995-2012 The R Core Team |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 2 of the License, or |
| # (at your option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # A copy of the GNU General Public License is available at |
| # https://www.R-project.org/Licenses/ |
| |
| |
| grid.locator <- function(unit="native") { |
| location <- c(grid.Call(C_locator), 1) |
| if (is.na(location[1L])) |
| invisible(NULL) |
| else { |
| transform <- solve(current.transform()) |
| location <- (location %*% transform) |
| # The inverse viewport transform is from device coordinates into |
| # inches relative to the current viewport |
| location <- unit(location/location[3L], "inches") |
| list(x=convertX(location[1L], unit), |
| y=convertY(location[2L], unit)) |
| } |
| } |
| |