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Fix bug in discrete position scales with continuous limits (fixes #3918) #3919

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Merged
merged 5 commits into from
Apr 30, 2020
Merged

Fix bug in discrete position scales with continuous limits (fixes #3918) #3919

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9faaca9
fix manual limits with discrete scale that was only trained using con…
paleolimbot Mar 31, 2020
ddd81e8
add test for the case of no discrete limits
paleolimbot Mar 31, 2020
5f49b8a
add warning if user supplies continuous limits to a discrete scale
paleolimbot Apr 2, 2020
d05e2ef
move warning to discrete_scale()
paleolimbot Apr 3, 2020
c8938fa
add test for continuous limits
paleolimbot Apr 3, 2020
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move warning to discrete_scale()
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@paleolimbot
paleolimbot committed Apr 3, 2020
commit d05e2efc5dceab220c45b5097c14bb57503db7d5
10 changes: 10 additions & 0 deletions R/scale-.r
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Expand Up @@ -164,6 +164,16 @@ discrete_scale <- function(aesthetics, scale_name, palette, name = waiver(),

check_breaks_labels(breaks, labels)

if (!is.function(limits) && (length(limits) > 0) && !is.discrete(limits)) {
warn(
glue(
"
Continuous limits supplied to discrete scale.
Did you mean `limits = factor(...)` or `scale_*_continuous()`?"
)
)
}

position <- match.arg(position, c("left", "right", "top", "bottom"))

# If the scale is non-positional, break = NULL means removing the guide
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5 changes: 1 addition & 4 deletions R/scale-expansion.r
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Expand Up @@ -200,12 +200,9 @@ expand_limits_continuous_trans <- function(limits, expand = expansion(0, 0),
expand_limits_discrete_trans <- function(limits, expand = expansion(0, 0),
coord_limits = c(NA, NA), trans = identity_trans(),
range_continuous = NULL) {
if (is.discrete(limits) || length(limits) == 0) {
if (is.discrete(limits)) {
n_discrete_limits <- length(limits)
} else {
warn(
"Continuous limits supplied to discrete scale.\nDid you mean `limits = factor(...)` or `scale_*_continuous()`?"
)
n_discrete_limits <- 0
}

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17 changes: 7 additions & 10 deletions tests/testthat/test-scale-expansion.r
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Expand Up @@ -104,16 +104,13 @@ test_that("expand_limits_continuous_trans() works with inverted transformations"
expect_identical(limit_info$continuous_range_coord, c(0, -3))
})

test_that("expand_limits_scale_discrete() correctly handles numeric limits", {
expect_warning(
expect_identical(
expand_limits_discrete(
-1:-16,
coord_limits = c(NA, NA),
range_continuous = c(-15, -2)
),
c(-15, -2)
test_that("expand_limits_scale_discrete() begrudgingly handles numeric limits", {
expect_identical(
expand_limits_discrete(
-1:-16,
coord_limits = c(NA, NA),
range_continuous = c(-15, -2)
),
"Continuous limits supplied to discrete scale"
c(-15, -2)
)
})
4 changes: 2 additions & 2 deletions tests/testthat/test-scales-breaks-labels.r
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Expand Up @@ -140,11 +140,11 @@ test_that("discrete scales with no data have no breaks or labels", {

test_that("suppressing breaks, minor_breask, and labels works", {
expect_equal(scale_x_continuous(breaks = NULL, limits = c(1, 3))$get_breaks(), NULL)
expect_equal(scale_x_discrete(breaks = NULL, limits = c(1, 3))$get_breaks(), NULL)
expect_equal(scale_x_discrete(breaks = NULL, limits = c("one", "three"))$get_breaks(), NULL)
expect_equal(scale_x_continuous(minor_breaks = NULL, limits = c(1, 3))$get_breaks_minor(), NULL)

expect_equal(scale_x_continuous(labels = NULL, limits = c(1, 3))$get_labels(), NULL)
expect_equal(scale_x_discrete(labels = NULL, limits = c(1, 3))$get_labels(), NULL)
expect_equal(scale_x_discrete(labels = NULL, limits = c("one", "three"))$get_labels(), NULL)

# date, datetime
lims <- as.Date(c("2000/1/1", "2000/2/1"))
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