inst/tinytest/test-15-properties.R

In jonclayden/shades: Simple Colour Manipulation

using("shades")

# Extract colour properties
expect_equal(saturation("red"), 1)
expect_equal(brightness("red"), 1)
expect_equal(saturation("grey40"), 0)
expect_equal(brightness(c("grey40","grey60")), c(0.4,0.6))
expect_equal(round(chroma(c("black","white","red"))), c(0,0,105))
expect_equal(round(lightness(c("black","white","red"))), c(0,100,53))

# Manipulate colour properties
expect_equal_shades(saturation("red",0.5), shade("#FF8080"))
expect_equal_shades(brightness("red",0.5), shade("#800000"))
expect_equal_shades(hue("red",delta(240)), shade("#0000FF"))
expect_equal_shades(hue("blue",delta(240)), shade("#00FF00"))
expect_equal_shades(lightness("red",scalefac(0.5)), shade("#A60000"))
expect_equal_shades(brightness("red",scalefac(0.4,0.6)), c("#660000","#990000"))
expect_equivalent(coords(brightness("grey40",c(0.2,0.6))), matrix(c(0,0,0,0,0.2,0.6),nrow=2))

# Manipulate colour matrices and check dimensions
shades <- shade(c("red","green","blue"))
matrix <- rep(shades, 2)
dim(matrix) <- c(3L,2L)

expect_null(dim(brightness(shades,0.5)))
expect_equal(length(brightness(shades,0.5)), 3L)
expect_equal(dim(brightness(shades,c(0.4,0.6))), c(2L,3L))
expect_equal_shades(brightness(shades,c(0.4,0.6)), c("#660000","#990000","#006600","#009900","#000066","#000099"))
expect_equal(dim(brightness(matrix,c(0.4,0.6))), c(2L,3L,2L))
expect_equal(dim(brightness(matrix,recycle(0.4,0.6))), c(3L,2L))