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test_that("spatial polygons have correct ordering", {
skip_if_not_installed("sp")
make_square <- function(x = 0, y = 0, height = 1, width = 1){
delx <- width/2
dely <- height/2
sp::Polygon(matrix(c(x + delx, x - delx,x - delx,x + delx,x + delx ,
y - dely,y - dely,y + dely,y + dely,y - dely), ncol = 2))
}
make_hole <- function(x = 0, y = 0, height = .5, width = .5){
p <- make_square(x = x, y = y, height = height, width = width)
p@hole <- TRUE
p
}
fake_data <- data_frame(ids = 1:5, region = c(1,1,2,3,4))
rownames(fake_data) <- 1:5
polys <- list(sp::Polygons(list(make_square(), make_hole()), 1),
sp::Polygons(list(make_square(1,0), make_square(2, 0)), 2),
sp::Polygons(list(make_square(1,1)), 3),
sp::Polygons(list(make_square(0,1)), 4),
sp::Polygons(list(make_square(0,3)), 5))
polys_sp <- sp::SpatialPolygons(polys)
fake_sp <- sp::SpatialPolygonsDataFrame(polys_sp, fake_data)
# now reorder regions
polys2 <- rev(polys)
polys2_sp <- sp::SpatialPolygons(polys2)
fake_sp2 <- sp::SpatialPolygonsDataFrame(polys2_sp, fake_data)
expected <- fortify(fake_sp2)
expected <- expected[order(expected$id, expected$order), ]
actual <- fortify(fake_sp)
# the levels are different, so these columns need to be converted to character to compare
expected$group <- as.character(expected$group)
actual$group <- as.character(actual$group)
# Use expect_equal(ignore_attr = TRUE) to ignore rownames
expect_equal(actual, expected, ignore_attr = TRUE)
})
test_that("fortify.default proves a helpful error with class uneval", {
expect_snapshot_error(ggplot(aes(x = x)))
})
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