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test_that("warnings are generated when coord_trans() results in new infinite values", {
p <- ggplot(head(diamonds, 20)) +
geom_bar(aes(x = cut)) +
coord_trans(y = "log10")
p2 <- ggplot(data_frame(a = c(1, 2, 0), b = c(10, 6, 4)), aes(a, b)) +
geom_point() +
coord_trans(x = "log")
# TODO: These multiple warnings should be summarized nicely. Until this gets
# fixed, this test ignores all the following errors than the first one.
suppressWarnings({
expect_warning(ggplot_gtable(ggplot_build(p)), "Transformation introduced infinite values in y-axis")
expect_warning(ggplot_gtable(ggplot_build(p2)), "Transformation introduced infinite values in x-axis")
})
})
test_that("no warnings are generated when original data has Inf values, but no new Inf values created from the transformation", {
p <- ggplot(data_frame(x = c(-Inf, 2, 0), y = c(Inf, 6, 4)), aes(x, y)) +
geom_point() +
coord_trans(x = 'identity')
expect_silent(benchplot(p))
})
test_that("coord_trans() expands axes identically to coord_cartesian()", {
p <- ggplot(mpg, aes(class, hwy)) + geom_point()
built_cartesian <- ggplot_build(p + coord_cartesian())
built_trans <- ggplot_build(p + coord_trans())
cartesian_params <- built_cartesian$layout$panel_params[[1]]
trans_params <- built_trans$layout$panel_params[[1]]
expect_identical(cartesian_params$x.range, trans_params$x.range)
expect_identical(cartesian_params$y.range, trans_params$y.range)
})
test_that("coord_trans(expand = FALSE) expands axes identically to coord_cartesian(expand = FALSE)", {
p <- ggplot(mpg, aes(class, hwy)) + geom_point()
built_cartesian <- ggplot_build(p + coord_cartesian(expand = FALSE))
built_trans <- ggplot_build(p + coord_trans(expand = FALSE))
cartesian_params <- built_cartesian$layout$panel_params[[1]]
trans_params <- built_trans$layout$panel_params[[1]]
expect_identical(cartesian_params$x.range, trans_params$x.range)
expect_identical(cartesian_params$y.range, trans_params$y.range)
})
test_that("coord_trans(y = 'log10') expands the x axis identically to scale_y_log10()", {
p <- ggplot(mpg, aes(class, hwy)) + geom_point()
built_cartesian <- ggplot_build(p + scale_y_log10())
built_trans <- ggplot_build(p + coord_trans(y = "log10"))
cartesian_params <- built_cartesian$layout$panel_params[[1]]
trans_params <- built_trans$layout$panel_params[[1]]
expect_identical(cartesian_params$y.range, trans_params$y.range)
})
test_that("coord_trans() expands axes outside the domain of the axis trans", {
# transform_sqrt() has a lower limit of 0
df <- data_frame(x = 1, y = c(0, 1, 2))
p <- ggplot(df, aes(x, y)) + geom_point()
built_cartesian <- ggplot_build(p + scale_y_sqrt())
built_trans <- ggplot_build(p + coord_trans(y = "sqrt"))
cartesian_params <- built_cartesian$layout$panel_params[[1]]
trans_params <- built_trans$layout$panel_params[[1]]
expect_identical(cartesian_params$y.range, trans_params$y.range)
})
test_that("coord_trans() works with the reverse transformation", {
df <- data_frame(x = c("1-one", "2-two", "3-three"), y = c(20, 30, 40))
p <- ggplot(df, aes(x, y)) + geom_point()
built_cartesian <- ggplot_build(p + scale_y_reverse())
built_trans <- ggplot_build(p + coord_trans(y = "reverse"))
cartesian_params <- built_cartesian$layout$panel_params[[1]]
trans_params <- built_trans$layout$panel_params[[1]]
expect_identical(cartesian_params$y.range, trans_params$y.range)
})
test_that("coord_trans() can reverse discrete axes", {
df <- data_frame(x = c("1-one", "2-two", "3-three"), y = c(20, 30, 40))
p <- ggplot(df, aes(x, y)) + geom_point()
built_cartesian <- ggplot_build(p)
built_trans <- ggplot_build(p + coord_trans(x = "reverse"))
cartesian_params <- built_cartesian$layout$panel_params[[1]]
trans_params <- built_trans$layout$panel_params[[1]]
expect_identical(cartesian_params$x.range, -rev(trans_params$x.range))
})
test_that("basic coord_trans() plot displays both continuous and discrete axes", {
expect_doppelganger(
"basic coord_trans() plot",
ggplot(mpg, aes(class, hwy)) +
geom_point() +
coord_trans(y = "log10")
)
})
test_that("second axes display in coord_trans()", {
expect_doppelganger(
"sec_axis with coord_trans()",
ggplot(mpg, aes(cty, hwy)) +
geom_point() +
scale_y_continuous(
sec.axis = sec_axis(
transform = ~log2(.),
breaks = c(3.5, 4, 4.5, 5, 5.5),
name = "log2(hwy)"
),
breaks = 2^c(3.5, 4, 4.5, 5, 5.5)
) +
scale_x_continuous(sec.axis = dup_axis()) +
coord_trans(y = "log2")
)
})
test_that("coord_trans() throws error when limits are badly specified", {
# throws error when limit is a Scale object instead of vector
expect_snapshot_error(ggplot() + coord_trans(xlim=xlim(1,1)))
# throws error when limit's length is different than two
expect_snapshot_error(ggplot() + coord_trans(ylim=1:3))
})
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