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color: Add more tests

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This commit is contained in:
David Briscoe 2022-03-27 00:53:37 -07:00
parent 343f320e2f
commit 41b1f0b5b9
2 changed files with 47 additions and 3 deletions
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5
modules/color.lua
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@ -174,6 +174,11 @@ function color.lighten(c, v)
)
end
--- Interpolate between two colors.
-- @tparam color at start
-- @tparam color at end
-- @tparam number s in 0-1 progress between the two colors
-- @treturn color out
function color.lerp(a, b, s)
return a + s * (b - a)
end

45
spec/color_spec.lua
View File

@ -116,6 +116,18 @@ describe("color:", function()
assert.is.equal(r[1], 0)
end)
it("multiply a color by a scalar", function()
local c = color(1, 1, 1, 1)
local r = c:multiply(0.04)
assert.is.equal(r[1], 0.04)
r = c:multiply(0)
for i=1,3 do
assert.is.equal(0, r[i])
end
assert.is.equal(1, r[4])
end)
it("modify alpha", function()
local c = color(1, 1, 1, 1)
local r = c:alpha(0.1)
@ -127,12 +139,39 @@ describe("color:", function()
assert.is.equal(r[4], 0.25)
end)
it("invert", function()
local c = color(1, 0.6, 0.25, 1)
local r = c:invert()
assert_is_float_equal(r[1], 0)
assert_is_float_equal(r[2], 0.4)
assert_is_float_equal(r[3], 0.75)
assert_is_float_equal(r[4], 1)
r = c:invert()
:invert()
for i=1,4 do
assert.is.equal(c[i], r[i])
end
end)
it("lerp", function()
local a = color(1, 0.6, 0.25, 1)
local b = color(1, 0.8, 0.75, 0.5)
local r = a:lerp(b, 0.5)
assert_is_float_equal(r[1], 1)
assert_is_float_equal(r[2], 0.7)
assert_is_float_equal(r[3], 0.5)
assert_is_float_equal(r[4], 0.75)
local r_a = a:lerp(b, 0)
local r_b = a:lerp(b, 1)
for i=1,4 do
assert.is.equal(a[i], r_a[i])
assert.is.equal(b[i], r_b[i])
end
end)
end)
--[[
invert(c)
lerp(a, b, s)
multiply(c, v)
gamma_to_linear(r, g, b, a)
linear_to_gamma(r, g, b, a)
to_string(a)