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# Produce a grob to be used as for panel backgrounds
guide_grid <- function(theme, x.minor, x.major, y.minor, y.major) {
x.minor <- setdiff(x.minor, x.major)
y.minor <- setdiff(y.minor, y.major)
ggname("grill", grobTree(
element_render(theme, "panel.background"),
if(length(y.minor) > 0) element_render(
theme, "panel.grid.minor.y",
x = rep(0:1, length(y.minor)), y = rep(y.minor, each=2),
id.lengths = rep(2, length(y.minor))
),
if(length(x.minor) > 0) element_render(
theme, "panel.grid.minor.x",
x = rep(x.minor, each=2), y = rep(0:1, length(x.minor)),
id.lengths = rep(2, length(x.minor))
),
if(length(y.major) > 0) element_render(
theme, "panel.grid.major.y",
x = rep(0:1, length(y.major)), y = rep(y.major, each=2),
id.lengths = rep(2, length(y.major))
),
if(length(x.major) > 0) element_render(
theme, "panel.grid.major.x",
x = rep(x.major, each=2), y = rep(0:1, length(x.major)),
id.lengths = rep(2, length(x.major))
)
))
}
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