Nothing
# Replacement for ggplot2:::mproject when using "mercator" projection
mproject2 <- function(coord, x, y, orientation){
npix <- 2 * pi
xXyY <- suppressWarnings(LonLat2XY(x, y, zoom = 0,
xpix = npix, ypix = npix))
x2 <- (npix * xXyY$X + xXyY$x) - pi
x2[is.nan(x2)] <- NA_real_
y2 <- pi - (npix * xXyY$Y + xXyY$y)
y2[is.nan(y2)] <- NA_real_
list(x = x2, y = y2,
range = c(range(x2, na.rm = TRUE), range(y2, na.rm = TRUE)),
error = 0)
}
# Modified ggplot2::coord_map, replaces uses of ggplot2:::mproject
# with mproject2. Dependence on ggplot2 (version >= 2.2.0) internals is
# unfortunate.
coord_map2 <- function(){
trans_fun <- get("f", environment(CoordMap$transform))
trans_env <- new.env(parent = environment(trans_fun))
assign("mproject", mproject2, trans_env)
environment(trans_fun) <- trans_env
name_is_setup <- "setup_panel_params" %in% names(CoordMap)
if (name_is_setup) {
train_fun <- get("f", environment(CoordMap$setup_panel_params))
} else {
train_fun <- get("f", environment(CoordMap$train))
}
train_env <- new.env(parent = environment(train_fun))
assign("mproject", mproject2, train_env)
environment(train_fun) <- train_env
ggargs <- alist(NULL, CoordMap, projection = "mercator", orientation = NULL,
limits = list(x = NULL, y = NULL), params = list(),
transform = trans_fun)
if (name_is_setup) {
ggargs <- c(ggargs, alist(setup_panel_params = train_fun))
} else {
ggargs <- c(ggargs, alist(train = train_fun))
}
do.call("ggproto", ggargs)
}
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